1
|
Zhao X, Zhou X, Xia Y, Xu Z, Song M, Wang Z, Guo Q, Jiang Z. Realizing the high loading amount of active Cu on Al 2O 3 to boost its CO catalytic oxidation. J Colloid Interface Sci 2024; 673:669-678. [PMID: 38901357 DOI: 10.1016/j.jcis.2024.06.130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 05/28/2024] [Accepted: 06/17/2024] [Indexed: 06/22/2024]
Abstract
Catalytic oxidation of carbon monoxide (CO) by Cu/Al2O3 has garnered increasing interest in recent years due to its promising application prospects. Numerous investigations conducted on the Cu/Al2O3 system, but its catalytic performance for CO oxidation is still not as promising as that of precious metal catalysts. Increasing the loading amount of the active Cu on Al2O3 surface is a feasible method for improving its activity. However, with the increase of Cu loading, the agglomeration and enlargement of Cu particles is inevitable, which reduces the active Cu amount. Therefore, the utilization rate of Cu atoms is not high and the catalytic performance often can not further rise. Enhancing active Cu loading amount as high as possible is a prerequisite to further enlarge the activity of Cu/Al2O3 catalyst. Herein, self-synthesized Al2O3 nanofibers (Al2O3-nf) with high specific surface area and abundant penta-coordinated aluminum (AlV) are used as the support to maximize the Cu loading amount by chemical vapor deposition (CVD). And commercially available α-Al2O3 is used for comparative experiment. The high specific surface area could make Cu high dispersion on Al2O3, even at 20 wt% Cu loads, which is beneficial to high concentration load of active Cu. The catalytic activity of Cu/Al2O3-nf-CVD gradually increases with the increase of Cu loading from 2 wt% to 20 wt%, exhibiting a clear linear correlation with the surface content of Cu0 on the catalyst. Meanwhile, this result confirms that Cu0 plays a crucial role in CO oxidation of Cu/Al2O3. However, commercial α-Al2O3 reaches its highest activity when the Cu load is 5%, and then its activity begins to decrease due to the agglomeration of particles. Moreover, Cu/Al2O3-nf-CVD also exhibits remarkable thermal stability for CO oxidation. This work highlights a new strategy to synthesis of high Cu loading amount, high activity and thermostable Cu/Al2O3 catalyst for low-temperature oxidation of CO.
Collapse
Affiliation(s)
- Xingling Zhao
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University, Weifang, Shandong 261061, China
| | - Xue Zhou
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
| | - Yupei Xia
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University, Weifang, Shandong 261061, China
| | - Zihan Xu
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University, Weifang, Shandong 261061, China
| | - Mingjun Song
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University, Weifang, Shandong 261061, China.
| | - Zihan Wang
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University, Weifang, Shandong 261061, China
| | - Qingjie Guo
- State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, 750021, China.
| | - Zaiyong Jiang
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University, Weifang, Shandong 261061, China.
| |
Collapse
|
2
|
Impact of Hydrothermally Prepared Support on the Catalytic Properties of CuCe Oxide for Preferential CO Oxidation Reaction. Catalysts 2022. [DOI: 10.3390/catal12060674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
CuCe mixed oxide is one of the most studied catalytic systems for preferential CO oxidation (CO-PrOx) for the purification of hydrogen-rich gas stream. In this study, a series of ceria supports were prepared via a citrates-hydrothermal route by altering the synthesis parameters (concentration and temperature). The resulting supports were used for the preparation of CuCe mixed-oxide catalysts via wet impregnation. Various physicochemical techniques were utilized for the characterization of the resulting materials, whereas the CuCe oxide catalysts were assessed in CO-PrOx reaction. Through the proper modification of the hydrothermal parameters, CeO2 supports with tunable properties can be formed, thus targeting the formation of highly active and selective catalysts. The nature of the reduced copper species and the optimum content in oxygen vacancies seems to be the key factors behind the remarkable catalytic performance of a CO-PrOx reaction.
Collapse
|
3
|
Qiu Z, Guo X, Mao J, Zhou R. Elucidating the structure, redox properties and active entities of high-temperature thermally aged CuO x-CeO 2 catalysts for CO-PROX. Phys Chem Chem Phys 2021; 23:15582-15590. [PMID: 34259269 DOI: 10.1039/d1cp01798e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
CuOx-CeO2 catalysts with different copper contents are synthesized via a coprecipitation method and thermally treated at 700 °C. Various characterization techniques including X-ray diffraction (XRD) Rietveld refinement, N2 adsorption-desorption isotherms, X-ray photoelectron spectra (XPS), UV-Raman, high-resolution transmission electron microscopy (HRTEM), temperature-programmed reduction (TPR) and in situ diffuse reflectance infrared Fourier transform spectra (DRIFTs) were adopted to investigate the structure/texture properties, oxygen vacancies, Cu-Ce interaction and redox properties of the catalysts. After the thermal treatment, the catalysts exhibited outstanding catalytic properties for the preferential oxidation (PROX) of CO (with the T50% of 62 °C and the widest operation temperature window of 85-140 °C), which provided a new strategy for the design of Cu-Ce based catalysts with high catalytic performance. The characterization results indicated that moderately elevating the copper content (below 5%) increases the amount of highly dispersed Cu species in the catalysts, including highly dispersed surface CuOx species and strongly bonded Cu-[Ox]-Ce species, strengthening the Cu-Ce interaction, increasing oxygen vacancies and promoting redox properties, but a further increase in copper content causes the agglomeration of crystalline CuO and decreases the highly dispersed Cu species. This work also provides evidence from the perspective that the catalytic performance of CuOx-CeO2 catalysts for CO-PROX at low and high reaction temperatures is dependent on the redox properties of highly dispersed CuOx species and strongly bonded Cu-[Ox]-Ce species, respectively.
Collapse
Affiliation(s)
- Zhihuan Qiu
- Institute of Catalysis, Zhejiang University, Hangzhou 310028, P. R. China.
| | - Xiaolin Guo
- College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, P. R. China
| | - Jianxin Mao
- Institute of Catalysis, Zhejiang University, Hangzhou 310028, P. R. China.
| | - Renxian Zhou
- Institute of Catalysis, Zhejiang University, Hangzhou 310028, P. R. China.
| |
Collapse
|
4
|
Enhanced Activity for CO Preferential Oxidation over CuO Catalysts Supported on Nanosized CeO2 with High Surface Area and Defects. Catalysts 2021. [DOI: 10.3390/catal11080884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Nanosizedceria (n-CeO2) was synthesized by a facile method in 2-methylimidazolesolution. The characterization results of XRD, N2 adsorption-desorption, Raman and TEM indicate that n-CeO2 shows a regular size of 10 ± 1 nm, a high surface area of 130 m2·g−1 and oxygen vacancies on the surface. A series of CuO/n-CeO2 catalysts (CuCeOX) with different copper loading were prepared for the preferential oxidation of CO in H2-rich gases (CO-PROX). All CuCeOX catalysts exhibit a high catalytic activity due to the excellent structural properties of n-CeO2, over which the 100% conversion of CO is obtained at 120 °C. The catalytic activity of CuCeOX catalysts increases in the order of CuCeO12 < CuCeO3 < CuCeO6 < CuCeO9. It is in good agreement with the order of the amount of active Cu+ species, Ce3+ species and oxygen vacancies on these catalysts, suggesting that the strength of interaction between highly dispersed CuO species and n-CeO2 is the decisive factor for the activity. The stronger interaction results in the formation of more readily reducible copper species on CuCeO9, which shows the highest activity with high stability and the broadest temperature “window” for complete CO conversion (120–180 °C).
Collapse
|
5
|
Facet-Dependent Reactivity of Ceria Nanoparticles Exemplified by CeO2-Based Transition Metal Catalysts: A Critical Review. Catalysts 2021. [DOI: 10.3390/catal11040452] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The rational design and fabrication of highly-active and cost-efficient catalytic materials constitutes the main research pillar in catalysis field. In this context, the fine-tuning of size and shape at the nanometer scale can exert an intense impact not only on the inherent reactivity of catalyst’s counterparts but also on their interfacial interactions; it can also opening up new horizons for the development of highly active and robust materials. The present critical review, focusing mainly on our recent advances on the topic, aims to highlight the pivotal role of shape engineering in catalysis, exemplified by noble metal-free, CeO2-based transition metal catalysts (TMs/CeO2). The underlying mechanism of facet-dependent reactivity is initially discussed. The main implications of ceria nanoparticles’ shape engineering (rods, cubes, and polyhedra) in catalysis are next discussed, on the ground of some of the most pertinent heterogeneous reactions, such as CO2 hydrogenation, CO oxidation, and N2O decomposition. It is clearly revealed that shape functionalization can remarkably affect the intrinsic features and in turn the reactivity of ceria nanoparticles. More importantly, by combining ceria nanoparticles (CeO2 NPs) of specific architecture with various transition metals (e.g., Cu, Fe, Co, and Ni) remarkably active multifunctional composites can be obtained due mainly to the synergistic metalceria interactions. From the practical point of view, novel catalyst formulations with similar or even superior reactivity to that of noble metals can be obtained by co-adjusting the shape and composition of mixed oxides, such as Cu/ceria nanorods for CO oxidation and Ni/ceria nanorods for CO2 hydrogenation. The conclusions derived could provide the design principles of earth-abundant metal oxide catalysts for various real-life environmental and energy applications.
Collapse
|
6
|
Wu C, Guo Z, Chen X, Liu H. Cu/CeO2 as efficient low-temperature CO oxidation catalysts: effects of morphological structure and Cu content. REACTION KINETICS MECHANISMS AND CATALYSIS 2020. [DOI: 10.1007/s11144-020-01870-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
7
|
Improvement in Low Temperature CO Oxidation Activity of CuOx/CeO2−δ by Cs2O Doping: Mechanistic Aspects. CATALYSIS SURVEYS FROM ASIA 2020. [DOI: 10.1007/s10563-020-09310-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
8
|
Lu J, Liu J, Zhao Y, He D, Han C, He S, Luo Y. The identification of active chromium species to enhance catalytic behaviors of alumina-based catalysts for sulfur-containing VOC abatement. JOURNAL OF HAZARDOUS MATERIALS 2020; 384:121289. [PMID: 31586919 DOI: 10.1016/j.jhazmat.2019.121289] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 07/11/2019] [Accepted: 09/22/2019] [Indexed: 06/10/2023]
Abstract
As to the treatment of sulfur containing VOCs (examples are compounds of CH3SH and C2H5SH), finding a catalyst with high performance is necessary. In this work, Cr(x)-Al2O3 (x = 1.0, 2.5, 5.0, 7.5 and 10 wt%) catalysts were synthesized, and their behaviors toward CH3SH and C2H5SH abatement were investigated. The results indicated that Cr(7.5)-Al2O3 exhibited higher activity than other samples and the reported catalysts, on which CH3SH could be almost completely converted at 375 °C, while the temperature for the reported catalysts was above 450 °C. Moreover, there was no obvious deactivation during 30 h on stream over Cr(7.5)-Al2O3, while only about 10 h was found on the reported CeO2 and HZSM-5 catalysts. The improvement in the catalytic performance could be explained by the important role of the Cr6+ species, while the state of Cr3+ was suggested to be ineffective in the degradation process. The identification of the active Cr sites was proved by the characterization measurements, and the control experiments by using mechanical mixtures of CrO3 or Cr2O3 with Al2O3 as well as the comparison studies between spent Al2O3 and spent Cr(7.5)-Al2O3 catalysts.
Collapse
Affiliation(s)
- Jichang Lu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China
| | - Jiangping Liu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China
| | - Yutong Zhao
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China
| | - Dedong He
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China.
| | - Caiyun Han
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China
| | - Sufang He
- Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming, 650093, PR China
| | - Yongming Luo
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China.
| |
Collapse
|
9
|
Liu B, Li Y, Qing S, Wang K, Xie J, Cao Y. Engineering CuO x–ZrO 2–CeO 2 nanocatalysts with abundant surface Cu species and oxygen vacancies toward high catalytic performance in CO oxidation and 4-nitrophenol reduction. CrystEngComm 2020. [DOI: 10.1039/d0ce00588f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
CuOx–ZrO2–CeO2 nanocrystalline catalysts were designed and synthesized by a solvent-free synthetic strategy, and exhibited excellent catalytic performance owing to the increased oxygen vacancies and better dispersed active metal species.
Collapse
Affiliation(s)
- Baolin Liu
- Key Laboratory of Energy Materials Chemistry
- Ministry of Education
- Key Laboratory of Advanced Functional Materials, Autonomous Region
- Institute of Applied Chemistry
- Xinjiang University
| | - Yizhao Li
- Key Laboratory of Energy Materials Chemistry
- Ministry of Education
- Key Laboratory of Advanced Functional Materials, Autonomous Region
- Institute of Applied Chemistry
- Xinjiang University
| | - Shaojun Qing
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Kun Wang
- Key Laboratory of Energy Materials Chemistry
- Ministry of Education
- Key Laboratory of Advanced Functional Materials, Autonomous Region
- Institute of Applied Chemistry
- Xinjiang University
| | - Jing Xie
- Key Laboratory of Energy Materials Chemistry
- Ministry of Education
- Key Laboratory of Advanced Functional Materials, Autonomous Region
- Institute of Applied Chemistry
- Xinjiang University
| | - Yali Cao
- Key Laboratory of Energy Materials Chemistry
- Ministry of Education
- Key Laboratory of Advanced Functional Materials, Autonomous Region
- Institute of Applied Chemistry
- Xinjiang University
| |
Collapse
|
10
|
Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System. Catalysts 2019. [DOI: 10.3390/catal9100852] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A catalytic screening was performed to determine the effect of the support on the performance of an Au–Cu based system for the removal of CO from an actual syngas. First, a syngas was obtained from reforming of ethanol. Then, the reformer outlet was connected to a second reactor, where Au–Cu catalysts supported on several single and dual metal oxides (i.e., CeO2, SiO2, ZrO2, Al2O3, La2O3, Fe2O3, CeO2-SiO2, CeO2-ZrO2, and CeO2-Al2O3) were evaluated. AuCu/CeO2 was the most active catalyst due to an elevated oxygen mobility over the surface, promoting CO2 formation from adsorption of C–O* and OH− intermediates on Au0 and CuO species. However, its lower capacity to release the surface oxygen contributes to the generation of stable carbon deposits, which lead to its rapid deactivation. On the other hand, AuCu/CeO2-SiO2 was more stable due to its high surface area and lower formation of formate and carbonate intermediates, mitigating carbon deposits. Therefore, use of dual supports could be a promising strategy to overcome the low stability of AuCu/CeO2. The results of this research are a contribution to integrated production and purification of H2 in a compact system.
Collapse
|
11
|
Liu B, Li Y, Cao Y, Wang L, Qing S, Wang K, Jia D. Optimum Balance of Cu+
and Oxygen Vacancies of CuO
x
-CeO2
Composites for CO Oxidation Based on Thermal Treatment. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801451] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Baolin Liu
- Key Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry; Xinjiang University, Urumqi; 830046 Xinjiang P. R. China
| | - Yizhao Li
- Key Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry; Xinjiang University, Urumqi; 830046 Xinjiang P. R. China
- College of Chemistry & Chemical Engineering; Xinjiang University, Urumqi; 830046 Xinjiang China
| | - Yali Cao
- Key Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry; Xinjiang University, Urumqi; 830046 Xinjiang P. R. China
| | - Lei Wang
- College of Chemistry & Chemical Engineering; Xinjiang University, Urumqi; 830046 Xinjiang China
| | - Shaojun Qing
- Institute of Coal Chemistry; Chinese Academy of Sciences, Taiyuan; 030001 Shanxi China
| | - Kun Wang
- Key Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry; Xinjiang University, Urumqi; 830046 Xinjiang P. R. China
| | - Dianzeng Jia
- Key Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry; Xinjiang University, Urumqi; 830046 Xinjiang P. R. China
| |
Collapse
|
12
|
Song XZ, Su QF, Li SJ, Liu SH, Zhang N, Meng YL, Chen X, Tan Z. Triple-shelled CuO/CeO2 hollow nanospheres derived from metal–organic frameworks as highly efficient catalysts for CO oxidation. NEW J CHEM 2019. [DOI: 10.1039/c9nj04244j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Through a metal–organic framework engaged strategy, triple-shelled CuO/CeO2-8% hollow nanospheres are fabricated as superior nanocatalysts for CO oxidation with excellent catalytic activity and cyclic stability.
Collapse
Affiliation(s)
- Xue-Zhi Song
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Panjin 124221
- China
| | - Qiao-Feng Su
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Panjin 124221
- China
| | - Shao-Jie Li
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Panjin 124221
- China
| | - Si-Hang Liu
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Panjin 124221
- China
| | - Nan Zhang
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Panjin 124221
- China
| | - Yu-Lan Meng
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Panjin 124221
- China
| | - Xi Chen
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Panjin 124221
- China
| | - Zhenquan Tan
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Panjin 124221
- China
| |
Collapse
|
13
|
Zhao Y, Lu J, Chen D, Zhang L, He S, Han C, He D, Luo Y. Probing the nature of active chromium species and promotional effects of potassium in Cr/MCM-41 catalysts for methyl mercaptan abatement. NEW J CHEM 2019. [DOI: 10.1039/c9nj02858g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The introduction of K enables a large number of CrO42− active species to be anchored and dispersed on the surface of Cr-based catalysts.
Collapse
Affiliation(s)
- Yutong Zhao
- Faculty of Environmental Science and Engineering
- Kunming University of Science and Technology
- Kunming 650500
- P. R. China
| | - Jichang Lu
- Faculty of Environmental Science and Engineering
- Kunming University of Science and Technology
- Kunming 650500
- P. R. China
| | - Dingkai Chen
- Faculty of Environmental Science and Engineering
- Kunming University of Science and Technology
- Kunming 650500
- P. R. China
| | - Liming Zhang
- Faculty of Environmental Science and Engineering
- Kunming University of Science and Technology
- Kunming 650500
- P. R. China
| | - Sufang He
- Research Center for Analysis and Measurement
- Kunming University of Science and Technology
- Kunming
- P. R. China
| | - Caiyun Han
- Faculty of Environmental Science and Engineering
- Kunming University of Science and Technology
- Kunming 650500
- P. R. China
| | - Dedong He
- Faculty of Chemical Engineering
- Kunming University of Science and Technology
- Kunming 650500
- P. R. China
| | - Yongming Luo
- Faculty of Environmental Science and Engineering
- Kunming University of Science and Technology
- Kunming 650500
- P. R. China
| |
Collapse
|