1
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Wang N, Zhou X, Yu X, Song Y, Ullah S, Nie X, Wang N, Zhang L. Preparation of Solid Superacid SO 42-/ZrO 2 and SO 42-/ZrO 2-M xO y (M=Ce, Co, Mn, and Zn) and Its Application in Toluene Nitration. ACS OMEGA 2024; 9:12037-12045. [PMID: 38496941 PMCID: PMC10938450 DOI: 10.1021/acsomega.3c09663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 02/05/2024] [Accepted: 02/09/2024] [Indexed: 03/19/2024]
Abstract
The nitration reaction of aromatic compounds is one of the extensively studied chemical reactions that result in the manufacturing of various industrial products applied in pharmaceuticals, dyes, perfumes, and explosives. A series of modified sulfated zirconia (SZ) catalysts SO42-/ZrO2-MxOy (M=Ce, Co, Mn, Zn, and M/SZ) doped with different metal elements by a coprecipitation method were investigated in the toluene nitration reaction. Various characterization techniques (X-ray diffraction, Brunauer-Emmett-Teller, thermogravimetric analysis, X-ray photoelectron spectroscopy, and temperature-programmed desorption of ammonia) indicated that doping metal elements in SZ led to excellent catalytic properties, increasing the specific surface area of the catalyst and facilitating the formation of a stable tetragonal zirconia phase. Doping zinc and cobalt in SZ enhanced the acidity of the catalyst and formed stronger acidic sites, promoting the generation of nitronium ions and providing more active sites for the toluene nitration reaction. Additionally, it reduced the loss of sulfate ions in the catalytic system that helped in improving the stability of the catalyst. Under the same conditions, the catalytic activity of toluene nitration reaction demonstrated the following order: Zn/SZ > Ce/SZ > Co/SZ > Mn/SZ > SZ, with the zinc-doped SZ catalyst exhibiting the best catalytic performance, achieving a toluene conversion rate of 78.58% and a para/ortho nitrotoluene ratio of 0.67.
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Affiliation(s)
- Ning Wang
- School
of Chemical Engineering, East China University
of Science and Technology, Shanghai 200231, China
| | - Xiaolong Zhou
- East
China University of Science and Technology, Shanghai 200231, China
| | - Xiaoyan Yu
- School
of Chemical Engineering, East China University
of Science and Technology, Shanghai 200231, China
| | - Yueqin Song
- East
China University of Science and Technology, Shanghai 200231, China
| | - Saif Ullah
- School
of Chemical Engineering, East China University
of Science and Technology, Shanghai 200231, China
| | - Xinyao Nie
- Qingyang
Chemical Industry Corporation, Liaoyang 111000, China
| | - Ning Wang
- Qingyang
Chemical Industry Corporation, Liaoyang 111000, China
| | - Lu Zhang
- Qingyang
Chemical Industry Corporation, Liaoyang 111000, China
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2
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Xiong Z, Zhu Y, Liu J, Du Y, Zhou F, Jin J, Yang Q, Lu W. The influence of H 2O or/and O 2 introduction during the low-temperature gas-phase sulfation of organic COS + CS 2 on the conversion and deposition of sulfur-containing species in the sulfated CeO 2-OS catalyst for NH 3-SCR. NANOSCALE 2024; 16:1223-1237. [PMID: 38115815 DOI: 10.1039/d3nr04686a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
Herein, the typical components of blast furnace gas, including H2O and O2, were introduced to improve the NH3-SCR activity of the sulfated CeO2-OS catalyst during the gas-phase sulfation of organic COS + CS2 at 50 °C. The characterization results demonstrate that the introduction of O2 or H2O during gas-phase sulfation enhances the conversion of organic COS + CS2 on a cubic fluorite CeO2 surface and reduces the formation of sulfur and sulfates in the catalyst, but decreases the BET surface area and pore volume of the sulfated CeO2-OS catalyst. However, the introduction of O2 or H2O during the gas-phase sulfation increases the molar ratios of Ce3+/(Ce3+ + Ce4+) and Oβ/(Oα + Oβ + Oγ) on the sulfated CeO2-OS catalyst surface, thus promoting the formation of surface oxygen vacancies and chemisorbed oxygen, and these properties of the catalyst are further enhanced by the co-existence of O2 and H2O. Furthermore, the reduction of sulfates formed under the action of O2 or H2O decreases the weak acid sites of the sulfated CeO2-OS catalyst, but the few and highly dispersive sulfates present stronger reducibility, and the proportion of medium-strong acid sites of the catalyst increases. These factors help to improve the NH3-SCR activity of the sulfated CeO2-OS catalyst. Thus, there exists a synergistic effect of H2O and O2 introduction during gas-phase sulfation on the physical-chemical properties and catalytic performance of the sulfated CeO2-OS catalyst by organic COS + CS2 at 50 °C.
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Affiliation(s)
- Zhibo Xiong
- School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai, 200093, China.
| | - Yafei Zhu
- School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai, 200093, China.
| | - Jiaxing Liu
- School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai, 200093, China.
| | - Yanping Du
- School of Engineering, Lancaster University, Lancaster, LA1 4YW, UK
| | - Fei Zhou
- Jiangsu Guoxin Jingjiang Power Co. Ltd., Jingjiang 214500, Jiangsu, China
| | - Jing Jin
- School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai, 200093, China.
| | - Qiguo Yang
- School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai, 200093, China.
| | - Wei Lu
- School of Energy and Power Engineering, University of Shanghai for Science & Technology, Shanghai, 200093, China.
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3
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Promotional Effect of Zirconium Doping on the NH
3
‐SCR Activity of CeO
2
and CeO
2
‐TA Modified by Thiourea: A Comparative Study. ChemCatChem 2023. [DOI: 10.1002/cctc.202201578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
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4
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Xiong Z, Zhang Y, Yang Q, Zhou F, Lu W, Shi H, Lu S. Promotional effect of nickel doping on the W/Fe2O3 catalyst for selective catalytic reduction of NO with NH3. MOLECULAR CATALYSIS 2023. [DOI: 10.1016/j.mcat.2022.112902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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5
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Zhang Y, Zhang K, Yang C, Yang M, Peng G, Xie Y, Wen J, Xia F, Jia L, Zhang Q. The promoting mechanism of SO42− on CeO2 for selective catalytic reduction of NO by NH3: A DFT study. Theor Chem Acc 2022. [DOI: 10.1007/s00214-022-02898-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Han Z, Li X, Wang X, Gao Y, Yang S, Song L, Dong J, Pan X. Insight into the promoting effect of support pretreatment with sulfate acid on selective catalytic reduction performance of CeO 2/ZrO 2 catalysts. J Colloid Interface Sci 2022; 608:2718-2729. [PMID: 34785048 DOI: 10.1016/j.jcis.2021.10.191] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 10/28/2021] [Accepted: 10/30/2021] [Indexed: 10/19/2022]
Abstract
In this paper, sulfated ZrO2 were synthesized via precipitation and impregnation method, and the promoting effects of support sulfation on selective catalytic reduction (SCR) performance of CeO2/ZrO2 catalysts were investigated. The results revealed that sulfated ZrO2 could significantly enhance the SCR activity of CeO2/ZrO2 catalysts in a wide temperature range. Especially when S/Zr molar ratio was 0.1, CeO2/ZrO2-0.1S catalyst exhibited a large operating temperature window of 251 ∼ 500 °C and its N2 selectivity was 100 % in the temperature range of 150 ∼ 500 °C. Moreover, CeO2/ZrO2-0.1S catalyst possessed a superior low-temperature activity over 0.1S-CeO2/ZrO2 catalyst. After exposing to 100 ppm SO2 for 15 h, a high NO conversion efficiency of CeO2/ZrO2-0.1S catalyst (90.7 %) could still be reached. The characterization results indicated that ZrO2 treated with a proper dosage of sulfate acid was beneficial to enlarge the specific surface area greatly. Sulfated ZrO2 was also in favor of promoting the transformation of CeO2 from crystalline state to highly-dispersed amorphous state, and inhibiting the transformation of ZrO2 from tetragonal to monoclinic phase. It could also enhance the total surface acidity greatly with an increase in both Brønsted acid sites and Lewis acid sites, thus significantly improving NH3 adsorption on catalyst surface. Besides, the promoting effect of support sulfation on SCR performance of CeO2/ZrO2 catalysts was also related with the enhanced redox property, higher Ce3+/(Ce3++Ce4+) ratio and abundant surface chemisorbed labile oxygen. The in-situ DRIFTS results implied that nitrate species coordinated on the surface of CeO2/ZrO2-0.1S catalyst could participate in the Selective catalytic reduction with ammonia (NH3-SCR) reactions at either medium or high temperature, suggesting that both Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) mechanisms might be followed in SCR reactions.
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Affiliation(s)
- Zhitao Han
- Marine Engineering College, Dalian Maritime University, Dalian 116026, China.
| | - Xiaodi Li
- School of Resources and Environmental Sciences, XinJiang University, Wulumuqi 830000, China
| | - Xinxin Wang
- Marine Engineering College, Dalian Maritime University, Dalian 116026, China
| | - Yu Gao
- Marine Engineering College, Dalian Maritime University, Dalian 116026, China
| | - Shaolong Yang
- School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Liguo Song
- Marine Engineering College, Dalian Maritime University, Dalian 116026, China
| | - Jingming Dong
- Marine Engineering College, Dalian Maritime University, Dalian 116026, China
| | - Xinxiang Pan
- Marine Engineering College, Dalian Maritime University, Dalian 116026, China; School of Electronic and Information Technology, Guangdong Ocean University, Zhanjiang 524088, China
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7
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Study on NH3-SCR of Cerium-based Substances in Rare Earth Concentrates from Bayan Obo. POLISH JOURNAL OF CHEMICAL TECHNOLOGY 2022. [DOI: 10.2478/pjct-2022-0001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
In this paper, CePO4 and CeCO3F were prepared by hydrothermal synthesis based on the ratio of bastnaesite to monazite in the process mineralogy of Baiyun Ebo rare earth concentrate. A comparison of the two treatments, ball milling and ball milling sulphation, revealed that the denitrification efficiency of the catalysts treated with ball milling sulphation increased by 20 percentage points, compared to those treated without sulphation, with denitrification efficiencies of up to 80%. The surface properties, redox properties and catalytic mechanism of the samples before and after the sulphation treatment were analyzed, by using XRD, NH3-TPD, H2-TPR, XPS and in situ IR characterization. The results showed that the CeF3 diffraction peaks in the XRD patterns disappeared in the sulphated samples, NH3-TPD showed that the adsorption capacity of NH3 on the surface of the samples was enhanced, and the introduction of sulphuric acid provided a large number of acidic sites on the catalyst surface, among which the Lewis acidic sites might be more favorable for the promotion of SCR reaction. The acidification of sulphuric acid greatly increases the redox capacity of the catalyst, and the interconversion between Cen+ was enhanced. XPS showed a significant increase in the amount of adsorbed oxygen on the surface of the sample. The presence of -NO2, an important intermediate in the L-H mechanism, was also detected by IR analysis. reactant species during the L-H mechanism reaction were monodentate nitrate, bridged nitrate and NH4
+ species produced by NH3 adsorption on the Brønsted acidic site of the catalyst surface.
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8
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Li C, Han Z, Wang X, Gao Y, Wang Z, Pan X. The promoting effect of support pretreatment with sulfate acid on the Ca resistance of a CeO 2/ZrO 2 catalyst for NH 3-SCR of NO x with NH 3. NEW J CHEM 2022. [DOI: 10.1039/d2nj02919g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
CaSO4 was formed through the reaction between S and Ca to relieve the effect of Ca-poisoning on the catalyst.
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Affiliation(s)
- Chenglong Li
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
| | - Zhitao Han
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
| | - Xinxin Wang
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
| | - Yu Gao
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
| | - Zhen Wang
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
| | - Xinxiang Pan
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
- School of Electronic and Information Technology, Guangdong Ocean University, Zhanjiang 524088, China
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9
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Li Z, Chen J, Jiang M, Li L, Zhang J, Duan W, Wen J, Wang H, Liu M, Zhang Q, Chen J, Ning P. Study on SO2 Poisoning Mechanism of CO Catalytic Oxidation Reaction on Copper–Cerium Catalyst. Catal Letters 2021. [DOI: 10.1007/s10562-021-03846-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Xie R, Ma L, Li Z, Qu Z, Yan N, Li J. Review of Sulfur Promotion Effects on Metal Oxide Catalysts for NOx Emission Control. ACS Catal 2021. [DOI: 10.1021/acscatal.1c02197] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Renyi Xie
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Lei Ma
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zihao Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zan Qu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Naiqiang Yan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Junhua Li
- School of Environment, Tsinghua University, Beijing 100084, China
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11
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Phule AD, Choi JH, Kim JH. High performance of catalytic sheet filters of V 2O 5-WO 3/TiO 2 for NO x reduction. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:34009-34016. [PMID: 32845468 DOI: 10.1007/s11356-020-10552-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 08/17/2020] [Indexed: 06/11/2023]
Abstract
Nitrogen oxide (NOx) emissions in fuel from the stationary as well as from mobile sources primarily from power stations, industrial heaters, cogeneration plants, and diesel engines represent a major worldwide environmental problem. The selective catalytic reduction (SCR) of NOx with NH3 over catalyst based on V2O5-WO3/TiO2 (VWT) is the most effective benchmark technique to efficiently reduce NOx emissions from stationary and mobile sources. Among the different transition metals (Mn, Nb, Co, Cr, Cu, Ce) used in current research work, the manganese could make up the loss of SCR activity caused by the decrease of V2O5 loading (50%) in prepared VWT powder catalyst. The optimal loading of Mn is 3 wt% in case of 3V9WT powder catalyst, which shows the best catalytic performance. 3Mn3V9WT powder catalyst exhibits enhanced NO conversion performance, i.e., ~ 95-98% with NH3 leakage < 20 ppm, for the temperature window of 260-320 °C in comparison with all other metal-doped 3V9WT catalyst powder. Manganese is the best substitute (50%) to vanadium in VWT catalyst without compromising the NO conversion performance even in presence of SO2 (1000 ppm), i.e., > 94% for the temperature of 300-320 °C. The recovery of SCR activity of the 3Mn3V9WT catalyst after SO2 effect was good, i.e., ~ 94% at 320 °C for long interval of time, where NH3 leakage was < 5 ppm.
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Affiliation(s)
- Ajit Dattatray Phule
- Department of Chemical Engineering/ERI, Gyeongsang National University, Jinju, 52828, Korea
| | - Joo Hong Choi
- Department of Chemical Engineering/ERI, Gyeongsang National University, Jinju, 52828, Korea.
| | - Jin Hyoung Kim
- Kyungsung Industry Co., LTD, Noksansandan 382 Ro 14 Bungil 41, Busan, Kangsu Gu, Korea
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12
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Ji J, Jing M, Wang X, Tan W, Guo K, Li L, Wang X, Song W, Cheng L, Sun J, Song W, Tang C, Liu J, Dong L. Activating low-temperature NH3-SCR catalyst by breaking the strong interface between acid and redox sites: A case of model Ce2(SO4)3-CeO2 study. J Catal 2021. [DOI: 10.1016/j.jcat.2021.05.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Li N, Chen Z, Bai X, Hou L, Jiao K, Wu W. Study on the mechanism of synthetic (Ce,La)CO 3F sulfuric acid acidification and NH 3-SCR loaded with Mn and Fe. RSC Adv 2021; 11:19943-19955. [PMID: 35479881 PMCID: PMC9033760 DOI: 10.1039/d1ra02788c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Accepted: 05/18/2021] [Indexed: 11/21/2022] Open
Abstract
A hydrothermal method was used to synthesise (Ce,La)CO3F grain simulated minerals, in accordance with the Ce-La ratio of bastnaesite in the mineralogy of the Bayan Ebo process. The NH3-SCR catalytic activity of the synthesised (Ce,La)CO3F was improved by loading transition metals Mn and Fe and sulphuric acid acidification treatments. The activity test results showed that the catalysts which were simultaneously acidified with sulphuric acid and loaded with transition metals Mn and Fe had a NO x conversion of 92% at 250 °C. XRD, SEM, XPS and in situ Fourier transform infrared spectroscopy (FTIR) were used to investigate the physical phase structure, surface morphology, reaction performance and mechanism of the catalysts, to provide theoretical guidance for the specific reaction path of cerium fluorocarbon ore in the NH3-SCR reaction. The results showed that the introduction of transition metals and sulphuric acid greatly increases the proportion of adsorbed oxygen (Oα) and facilitates the adsorption of NH3 and NO. The catalyst surface metal sulphate and metal oxide species act as the main active components on the catalyst surface to promoted the reaction, and cracks and pores appear on the surface to facilitate the adsorption of reactive gases. The reaction mechanism of the SO4 2--Mn-Fe/(Ce,La)CO3F catalyst, and characterisation of the adsorption and conversion behaviour of the reactive species on the catalyst surface, were investigated by Fourier transform infrared spectroscopy (FTIR). The results showed that the catalyst follows the E-R and L-H mechanisms throughout the reaction, with the E-R mechanism being the main reaction. The reaction species were NH4 +/NH3 species in the adsorbed state and NO. The NH3(ad) species on the Lewis acidic site is the main NH3(g) adsorbed species for the reaction, bonded to Ce4+ in the carrier (Ce,La)CO3F to participate in the acid cycle reaction, and undergo a redox reaction on the catalyst surface to produce N2 and H2O. The SO4 2- present on the catalyst surface can also act as an acidic site for the adsorption of NH3. The above results indicated the excellent performance of the SO4 2--Mn-Fe/(Ce,La)CO3F catalyst, which provided a theoretical basis for the high value utilization of bastnaesite.
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Affiliation(s)
- Na Li
- School of Energy and Environment, Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China
- School of Environmental Science and Engineering, North China Electric Power University Baoding Hebei 071000 China
| | - Zedong Chen
- School of Energy and Environment, Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China
| | - Xinrui Bai
- School of Energy and Environment, Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China
| | - Limin Hou
- Key Laboratory of Efficient and Clean Combustion Baotou 014010 Inner Mongolia Autonomous Region China
| | - Kunling Jiao
- School of Energy and Environment, Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China
| | - Wenfei Wu
- School of Energy and Environment, Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China
- Key Laboratory of Efficient and Clean Combustion Baotou 014010 Inner Mongolia Autonomous Region China
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14
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Li X, Han Z, Shi Q, Wang X, Wu X, Gao Y, Li C, Liu G. Characterization of WMnCeTiO x catalysts prepared by different methods for the selective reduction of NO with NH 3. NEW J CHEM 2021. [DOI: 10.1039/d1nj03891e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
WMnCeTiOx(CP) catalysts showed excellent NH3-SCR activity and better SO2 tolerance.
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Affiliation(s)
- Xiaodi Li
- School of Resources and Environmental Sciences, XinJiang University, Wulumuqi, 830000, China
| | - Zhitao Han
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
- Liaoning Research Center for Marine Internal Combustion Engine Energy-Saving, Dalian 116026, China
| | - Qingdong Shi
- School of Resources and Environmental Sciences, XinJiang University, Wulumuqi, 830000, China
| | - Xinxin Wang
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
| | - Xitian Wu
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
| | - Yu Gao
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
| | - Chenglong Li
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
| | - Gang Liu
- Marine Engineering College, Dalian Maritime University, No. 1, Linghai Road, Dalian 116026, China
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15
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Yu C, Hou D, Huang B, Lu M, Peng R, Zhong Z. A MnO x@Eu-CeO x nanorod catalyst with multiple protective effects: Strong SO 2-tolerance for low temperature DeNO x processes. JOURNAL OF HAZARDOUS MATERIALS 2020; 399:123011. [PMID: 32535516 DOI: 10.1016/j.jhazmat.2020.123011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/12/2020] [Accepted: 05/20/2020] [Indexed: 06/11/2023]
Abstract
A novel MnOx@Eu-CeOx catalyst with multiple protective attributes was designed and fabricated using a chemical precipitation method and tested for its low temperature SCR activity. The subject MnOx@Eu-CeOx nanorod catalyst exhibited superior SCR performance and strong SO2-tolerance. The formation of the composite-shell structure enhanced the catalysts' surface acidity and redox performance, which resulted in excellent SCR performance. Moreover, the TG results suggested that the protective effect of the EuOx-CeOx composite-shell effectively reduced the deposition of the surface sulphates. The XPS, XRD analysis results of the subject catalyst together with theoretical calculations provided strong evidence that there was a strong interaction between Mn and Ce in the MnOx@Eu-CeOx. This significant interaction could provide maximum protection to the core from the effect of SO2, which also contributed to the high SO2 resistance of the catalyst. In situ FT-IR results also indicated that the chemisorbed species on MnOx@Eu-CeOx were much more stable in the presence of SO2 compared to Eu-CeOx/MnOx, which resulted in the deposition of significantly less sulphates. This low temperature SCR catalyst with multiple protective attributes, including composite shell, strong interaction and core-shell structure, is the key to long-term resistance to SO2.
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Affiliation(s)
- Chenglong Yu
- School of Land Resources and Environment, Key Laboratory of Agricultural Resource and Ecology in the Poyang Lake Basin of Jiangxi Province, Jiangxi Agricultural University, Nanchang 330045, China.
| | - Dan Hou
- Key Laboratory of Chemical Utilization of Plant Resources of Nanchang, College of Science, Jiangxi Agricultural University, Nanchang 330045, China
| | - Bichun Huang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Meijuan Lu
- School of Land Resources and Environment, Key Laboratory of Agricultural Resource and Ecology in the Poyang Lake Basin of Jiangxi Province, Jiangxi Agricultural University, Nanchang 330045, China
| | - Ruosi Peng
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Zhiyong Zhong
- School of Land Resources and Environment, Key Laboratory of Agricultural Resource and Ecology in the Poyang Lake Basin of Jiangxi Province, Jiangxi Agricultural University, Nanchang 330045, China
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16
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Zeng Y, Haw K, Wang Y, Zhang S, Wang Z, Zhong Q, Kawi S. Recent Progress of CeO
2
−TiO
2
Based Catalysts for Selective Catalytic Reduction of NO
x
by NH
3. ChemCatChem 2020. [DOI: 10.1002/cctc.202001307] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Yiqing Zeng
- School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 P.R. China
- Department of Chemical and Biomolecular Engineering National University of Singapore Singapore 117582 Singapore
| | - Kok‐Giap Haw
- Department of Chemical and Biomolecular Engineering National University of Singapore Singapore 117582 Singapore
| | - Yanan Wang
- School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 P.R. China
| | - Shule Zhang
- School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 P.R. China
| | - Zhigang Wang
- Department of Chemical and Biomolecular Engineering National University of Singapore Singapore 117582 Singapore
| | - Qin Zhong
- School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 P.R. China
| | - Sibudjing Kawi
- Department of Chemical and Biomolecular Engineering National University of Singapore Singapore 117582 Singapore
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17
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Liu C, Wang H, Bi Y, Zhang Z. A study on the selective catalytic reduction of NO x by ammonia on sulphated iron-based catalysts. RSC Adv 2020; 10:40948-40959. [PMID: 35519207 PMCID: PMC9057717 DOI: 10.1039/d0ra06697d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 10/08/2020] [Indexed: 01/12/2023] Open
Abstract
A series of sulphated iron-based catalysts was prepared via an impregnation method by changing the loading content of Fe3+ and SO42− on ZrO2, and their performance in the selective catalytic reduction (SCR) of NOx by ammonia was investigated. The NOx conversion exhibited large differences among the sulphated iron-based catalysts. To explore the synergistic mechanism of iron and sulphates, XRD, BET, H2-TPR, XPS, TPD and in situ DRIFTS were used to characterize the catalysts, and it was found that among all the catalysts, the NOx conversion by Fe2SZr was greater than 90% at 350–450 °C. The results indicated that the interaction between Fe3+ and SO42− can have an effect on the redox ability, acid sites, and adsorption of NOx and NH3. With an increase in the content of Fe3+, the redox activity of the catalyst and the adsorption of ammonia improved at medium and low temperatures. However, at higher temperatures, an increase in Fe3+ led to a decrease in the conversion of NOx due to the enhanced oxidation of NH3. At medium and low temperatures, an increase in the content of SO42− decreased the concentration of Fe3+ on the surface of the catalyst and inhibited the adsorption of NOx and NH3. The addition of SO42− reduced the redox activity of the catalyst and inhibited the oxidation reaction of NH3, which follows the Eley–Rideal mechanism at high temperatures, further enhancing the SCR activity of the FexSyZr catalyst. The roles of Fe3+ and SO42− are different at low and high temperatures due to their interaction. It is the appropriate contents of Fe3+ and SO42− that can result in high NH3-SCR activity at varying temperatures.![]()
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Affiliation(s)
- Caixia Liu
- School of Environmental Science and Engineering, Tianjin University Tianjin 300072 China +86-22-8740-2075 +86-13426103078
| | - Huijun Wang
- School of Environmental Science and Engineering, Tianjin University Tianjin 300072 China +86-22-8740-2075 +86-13426103078
| | - Yalian Bi
- School of Environmental Science and Engineering, Tianjin University Tianjin 300072 China +86-22-8740-2075 +86-13426103078
| | - Ziyin Zhang
- Langfang City Beichen Entrepreneurship Resin Materials Incorporated Company Langfang 065000 China +86-15010892987
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18
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Lewis acid-oxygen vacancy interfacial synergistic catalysis over SO42−/Ce0.84Zr0.16O2–WO3–ZrO2 for N,N-diethylation of aniline with ethanol. J RARE EARTH 2020. [DOI: 10.1016/j.jre.2019.11.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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19
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The Latest Research Progress of NH3-SCR in the SO2 Resistance of the Catalyst in Low Temperatures for Selective Catalytic Reduction of NOx. Catalysts 2020. [DOI: 10.3390/catal10091034] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The selective catalytic reduction (SCR) has been widely used in industrial denitrification owing to its high denitrification efficiency, low operating costs, and simple operating procedures. However, coal containing a large amount of sulfur will produce SO2 during combustion, which makes the catalyst easy to be deactivated, thus limiting the application of this technology. This review summarizes the latest NH3-SCR reaction mechanisms and the deactivation mechanism of catalyst in SO2-containing flue gas. Some strategies are summarized for enhancing the poison-resistance through modification, improvement of support, the preparation of complex oxide catalyst, optimizing the preparation methods, and acidification. The mechanism of improving sulfur resistance of catalysts at low temperatures is summarized, and the further development of the catalyst is also prospected. This paper could provide a reference and guidance for the development of SO2 resistance of the catalyst at low temperatures.
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20
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Liang Y, Ding X, Du Z, Wang J, Zhao M, Dan Y, Jiang L, Chen Y. Low-temperature performance controlled by hydroxyl value in polyethylene glycol enveloping Pt-based catalyst for CO/C3H6/NO oxidation. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2019.110740] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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21
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In situ DRIFTS investigation on CeO2/TiO2–ZrO2–SO2−4 catalyst for NH3–SCR: the influence of surface acidity and reducibility. RESEARCH ON CHEMICAL INTERMEDIATES 2020. [DOI: 10.1007/s11164-019-03961-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Arfaoui J, Ghorbel A, Petitto C, Delahay G. A new V 2O 5–MoO 3–TiO 2–SO 42−nanostructured aerogel catalyst for diesel DeNO xtechnology. NEW J CHEM 2020. [DOI: 10.1039/d0nj03747h] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A new V2O5–MoO3–TiO2–SO42−nanostructured aerogel catalyst exhibits superior SCR activity compared to the V2O5–WO3/TiO2commercial catalyst (EUROCAT) at high temperatures (375–500 °C).
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Affiliation(s)
- Jihene Arfaoui
- Université Tunis El Manar
- Laboratoire de Chimie des Matériaux et Catalyse
- Département de Chimie
- Faculté des Sciences de Tunis
- Campus Universitaire Farhat Hached d'El Manar
| | - Abdelhamid Ghorbel
- Université Tunis El Manar
- Laboratoire de Chimie des Matériaux et Catalyse
- Département de Chimie
- Faculté des Sciences de Tunis
- Campus Universitaire Farhat Hached d'El Manar
| | - Carolina Petitto
- ICGM, University of Montpellier
- ENSCM (MACS)
- CNRS
- Montpellier
- France
| | - Gerard Delahay
- ICGM, University of Montpellier
- ENSCM (MACS)
- CNRS
- Montpellier
- France
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23
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Song Z, Xing Y, Zhang T, Zhao J, Wang J, Mao Y, Zhao B, Zhang X, Zhao M, Ma Z. Effectively promoted catalytic activity by adjusting calcination temperature of Ce‐Fe‐O
x
catalyst for NH
3
‐SCR. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.5446] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Zhongxian Song
- Faculty of Environmental and Municipal Engineering, Henan Key Laboratory of Water Pollution Control and Rehabilitation TechnologyHenan University of Urban Construction Pingdingshan 467000 People's Republic of China
| | - Yun Xing
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Tingji Zhang
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Jinggang Zhao
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Junkai Wang
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Yanli Mao
- Faculty of Environmental and Municipal Engineering, Henan Key Laboratory of Water Pollution Control and Rehabilitation TechnologyHenan University of Urban Construction Pingdingshan 467000 People's Republic of China
| | - Baolin Zhao
- Faculty of Environmental and Municipal Engineering, Henan Key Laboratory of Water Pollution Control and Rehabilitation TechnologyHenan University of Urban Construction Pingdingshan 467000 People's Republic of China
| | - Xuejun Zhang
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Min Zhao
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Ziang Ma
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
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24
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Ko A, Woo Y, Jang J, Jung Y, Pyo Y, Jo H, Lim O, Lee YJ. Complementary effects between NO oxidation of DPF and NO2 decomposition of SCR in light-duty diesel engine. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.07.045] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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25
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Song Z, Xing Y, Zhang X, Zhao H, Zhao M, Zhao J, Ma Z, Zhang Q. Silicotungstic acid modified Ce‐Fe‐O
x
catalyst for selective catalytic reduction of NO
x
with NH
3
: Effect of the amount of HSiW. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.5160] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Zhongxian Song
- Faculty of Environmental and Municipal Engineering, Henan Key Laboratory of Water Pollution Control and Rehabilitation TechnologyHenan University of Urban Construction Pingdingshan 467036 People's Republic of China
| | - Yun Xing
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Xuejun Zhang
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Heng Zhao
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Min Zhao
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Jinggang Zhao
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Zi'ang Ma
- College of Environmental and Safety EngineeringShenyang University of Chemical Technology Shenyang 110142 People's Republic of China
| | - Qiulin Zhang
- Faculty of Environmental Science and EngineeringKunming University of Science and Technology Kunming 650500 Republic of China
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26
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Huang Y, Li P, Zhang R, Wei Y. Efficiency of Phosphotungstic Acid Modified Mn-Based Catalysts to Promote Activity and N2 Formation for Selective Catalytic Reduction of NO with Ammonia. INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING 2019. [DOI: 10.1515/ijcre-2018-0057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In this work, the modified Mn-based NH3-SCR (NH3 low-temperature selective catalytic reduction) catalysts with excellent NO conversion and N2 selectivity be designed. N2 yield was hardly more than 75 % over MnOx/TiO2 for NH3-SCR reaction, whereas the NH3-SCR performance has been significantly improved by using 50 wt.% HPW (H3PW12O40)-MnOx/TiO2. 100 % NO conversion and more than 95 % N2 yield was obtained in wide operating temperature window (150–400°C), suggesting that the addition of HPW could effectively improve the NO reduction conversion. After that, the catalysts were further characterized by XRD, H2-TPR, XPS and in situ DRIFT. DRIFT analysis implied that the introduction of HPW significantly improve the capacity of NH4
+ species adsorbed on Brønsted acid sites accompanied with inhibiting the formation and consumption of nitrite species. It proved that the non-selective catalytic reduction reaction over HPW-MnOx/TiO2 catalysts are restrained. HPW could accelerate the formation and consumption of NH4
+ species adsorbed on Brønsted acid sites with deactivation of nitrate species. In addition, NH3(ad) could be hardly oxidized to NH species and then reacted with nitrate species (L-H mechanism) and gaseous NO (E-R mechanism). More importantly, the oxidation of NH3 was also suppressed, which plays a dominate role to form N2O above 300°C. Besides, the deactivation of potassium poisoning on the SCR activity significantly weakened for modified samples compared to parent catalyst.
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27
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Lian Z, Shan W, Wang M, He H, Feng Q. The balance of acidity and redox capability over modified CeO 2 catalyst for the selective catalytic reduction of NO with NH 3. J Environ Sci (China) 2019; 79:273-279. [PMID: 30784451 DOI: 10.1016/j.jes.2018.11.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 11/21/2018] [Accepted: 11/22/2018] [Indexed: 06/09/2023]
Abstract
The effect of acidity and redox capability over sulfuric acid-modified CeO2 catalysts were studied for the selective catalytic reduction of NOx with NH3 (NH3-SCR). The deposition of sulfate significantly enhanced the catalytic performance over CeO2. NOx conversion over 4H2SO4/CeO2 at 230-440 °C was higher than 90%. The strong redox capability of CeO2 could result in unselective NH3 oxidation and decrease high temperatures catalytic activity and N2 selectivity. The deposition of sulfate increased the acidity and weakened the redox capability, and then increased the high temperature NOx conversion and N2 selectivity. An appropriate level of acidity also promoted the activity at 190-250 °C over ceria-based catalysts, and with further increase in the acidity, the SCR activity decreased slightly. Weak redox capability lowered the low-temperature catalytic activity. Excellent SCR activity requires a balance of acidity and redox capability on the catalysts.
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Affiliation(s)
- Zhihua Lian
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
| | - Wenpo Shan
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Meng Wang
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Hong He
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Qingcai Feng
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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28
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Removal of NOx by selective catalytic reduction coupled with plasma under temperature fluctuation condition. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2018.12.042] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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29
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Effects of Cu loading and zeolite topology on the selective catalytic reduction with C3H6 over Cu/zeolite catalysts. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2018.12.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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30
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Zhang X, Wang J, Song Z, Zhao H, Xing Y, Zhao M, Zhao J, Ma Z, Zhang P, Tsubaki N. Promotion of surface acidity and surface species of doped Fe and SO42- over CeO2 catalytic for NH3-SCR reaction. MOLECULAR CATALYSIS 2019. [DOI: 10.1016/j.mcat.2018.11.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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31
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Effect of calcination temperature on low-temperature NH3-SCR activity and the resistance of SO2 with or without H2O over Fe–Mn–Zr catalyst. J Taiwan Inst Chem Eng 2018. [DOI: 10.1016/j.jtice.2018.07.027] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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32
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Enhanced performance at an early state of hydrocarbon selective catalyst reduction of NOx by atmospheric pressure plasma. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.08.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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33
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34
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Zeng Y, Wang Y, Zhang S, Zhong Q, Rong W, Li X. One-pot synthesis of ceria and cerium phosphate (CeO2-CePO4) nanorod composites for selective catalytic reduction of NO with NH3: Active sites and reaction mechanism. J Colloid Interface Sci 2018; 524:8-15. [DOI: 10.1016/j.jcis.2018.04.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Revised: 04/02/2018] [Accepted: 04/02/2018] [Indexed: 10/17/2022]
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35
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Deng J, Zhou Y, Li S, Xiong L, Wang J, Yuan S, Chen Y. Designed synthesis and characterization of nanostructured ceria-zirconia based material with enhanced thermal stability and its application in three-way catalysis. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.03.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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36
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Simultaneous removal of NO and soot particulates from diesel engine exhaust by 3DOM Fe–Mn oxide catalysts. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.02.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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37
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Cui Y, Lan L, Shi Z, Yuan S, Chen Y, Dan Y. New insight into the microstructure–thermal stability relationships in ceria-zirconia solid solution and the application in Pd-only three-way catalyst. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2017.10.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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38
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Enhanced activity and stability of the monolithic Pt/SiO2–Al2O3 diesel oxidation catalyst promoted by suitable tungsten additive amount. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2017.06.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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39
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Cooperative behavior of perfluoro carboxylic acid on cyclohexane oxidation catalyzed by μ-nitrido diiron phthalocyanine complex. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2017.05.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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40
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Yu C, Chen F, Dong L, Liu X, Huang B, Wang X, Zhong S. Manganese-rich MnSAPO-34 molecular sieves as an efficient catalyst for the selective catalytic reduction of NO x with NH 3: one-pot synthesis, catalytic performance, and characterization. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:7499-7510. [PMID: 28116621 DOI: 10.1007/s11356-017-8375-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Accepted: 01/03/2017] [Indexed: 06/06/2023]
Abstract
Manganese-rich MnSAPO-34 molecular sieves were prepared by one-pot synthesis method for NO x abatement using the ammonia-selective catalytic reduction (NH3-SCR) technology and characterized using ICP, BET, XRD, FE-SEM, H2-TPR, NH3-TPD, XPS, and DR UV-Vis analyses. The experimental results indicate that the Mn content and chemical state, as well as the surface acidity, of the MnSAPO-34 molecular sieves significantly enhance their DeNO x efficiency at low temperatures (ca. 200-300 °C). The manganese-rich MnSAPO-34 was synthesized using a combination of triethylamine and diisopropylamine as the structural directing agents and high Mn loading (n(MnO)/n(P2O5) = 0.4). The resulting catalyst exhibits the highest activity among all of the samples with a NO x conversion value of nearly 95% and a N2 selectivity that is higher than 90% at 220-400 °C. In addition, this catalyst presents higher NO x conversion than the conventional V2O5-WO3/TiO2 catalysts and other SAPO-based catalysts below 300 °C. Furthermore, the analytical results indicate that the manganese species in the catalyst are mainly in the form of a framework Mn(IV), which could play a significant role in the NH3-SCR process as the specific active species. The results suggest that controlling the types and content of the organic amine templates and variations in the surface acidity of the catalysts may significantly enhance the SCR activity at lower temperatures.
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Affiliation(s)
- Chenglong Yu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Feng Chen
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Lifu Dong
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Xiaoqing Liu
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Bichun Huang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China.
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China.
| | - Xinnan Wang
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
| | - Shengbang Zhong
- School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People's Republic of China
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41
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Promotional Effect of Ce on Iron-Based Catalysts for Selective Catalytic Reduction of NO with NH3. Catalysts 2016. [DOI: 10.3390/catal6080112] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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