1
|
Ultrasonic-Assisted Preparation of WO3/SiO2 from Rigid Silicon Spheres for the Thiolation of Dimethyl Sulfide to Methanethiol. Catal Letters 2022. [DOI: 10.1007/s10562-022-03930-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
2
|
Nayak PS, Barik B, Achary LSK, Maji B, Sahoo SJ, Dash P. Facile design of a WO3 nanorod-decorated graphene oxide 1D–2D nanocatalyst for the synthesis of quinoline and its derivatives. NEW J CHEM 2022. [DOI: 10.1039/d1nj05681f] [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
Graphene oxide supported WO3 nanorod as an efficient and recyclable catalyst for synthesis of Quinoline and its derivatives under solventless condition.
Collapse
Affiliation(s)
- Pratap S. Nayak
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, Odisha, India
| | - Bapun Barik
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, Odisha, India
- School of material science and Engineering, Chonnam National University, Gwang-Ju, Republic of Korea
| | - L. Satish K. Achary
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, Odisha, India
- Department of chemistry, CV Raman Global University, Bhubaneswar, Odisha, 752054, India
| | - Banalata Maji
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, Odisha, India
| | - Shital Jyotsna Sahoo
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, Odisha, India
| | - Priyabrat Dash
- Department of Chemistry, National Institute of Technology, Rourkela, 769008, Odisha, India
| |
Collapse
|
3
|
Shan W, Yu Y, Zhang Y, He G, Peng Y, Li J, He H. Theory and practice of metal oxide catalyst design for the selective catalytic reduction of NO with NH3. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.05.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
4
|
Abstract
This review aims to give a general overview of the recent use of tungsten-based catalysts for wide environmental applications, with first some useful background information about tungsten oxides. Tungsten oxide materials exhibit suitable behaviors for surface reactions and catalysis such as acidic properties (mainly Brønsted sites), redox and adsorption properties (due to the presence of oxygen vacancies) and a photostimulation response under visible light (2.6–2.8 eV bandgap). Depending on the operating condition of the catalytic process, each of these behaviors is tunable by controlling structure and morphology (e.g., nanoplates, nanosheets, nanorods, nanowires, nanomesh, microflowers, hollow nanospheres) and/or interactions with other compounds such as conductors (carbon), semiconductors or other oxides (e.g., TiO2) and precious metals. WOx particles can be also dispersed on high specific surface area supports. Based on these behaviors, WO3-based catalysts were developed for numerous environmental applications. This review is divided into five main parts: structure of tungsten-based catalysts, acidity of supported tungsten oxide catalysts, WO3 catalysts for DeNOx applications, total oxidation of volatile organic compounds in gas phase and gas sensors and pollutant remediation in liquid phase (photocatalysis).
Collapse
|
5
|
Advanced Synthesis and Characterization of Vanadia/Titania Catalysts through a Molecular Approach. Catalysts 2021. [DOI: 10.3390/catal11030322] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Vanadia/titania catalysts were synthesized by the equilibrium deposition filtration (EDF) method, which is a synthesis route that follows a molecular-level approach. The type of interfacial deposition as well as the interfacial speciation of the deposited oxo-V(V) species were determined by means of a model that takes into account experimental “proton-ion” curves and “adsorption edges”. It is shown that at pH ≥ 9.5, the deposition proceeds exclusively through the formation of mono-substituted inner sphere monomeric species in an “umbrella”-like Ti–OV(OH)2O configuration, whilst with lowering of the pH, a second species, namely the disubstituted inner sphere quadrameric species in a (Ti-O)2V4O10 configuration possessing two mono-oxo V=O and two di-oxo V(=O)2 terminations gradually prevails, which is in co-existence with the monomeric species. Raman spectroscopy is used for verifying the solution speciation, which is different compared to the interfacial speciation of the deposited oxo-V(V) species. Furthermore, in situ Raman spectroscopy was used to verify the model-predicted interfacial speciation of the deposited oxo-V(V) species and to monitor the temperature-dependent evolution up to 430 °C. Hence, a controlled formation of a specific vanadia species on a titania surface is enabled, which, depending on the synthesis conditions, can result in specific catalyst characteristics and thus possibly different catalytic behavior for a specific reaction.
Collapse
|
6
|
Influence of support composition on enhancing the performance of Ce-V on TiO2 comprised tungsten-silica for NH3-SCR. Catal Today 2021. [DOI: 10.1016/j.cattod.2019.07.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
7
|
Recent Progress on Improving Low-Temperature Activity of Vanadia-Based Catalysts for the Selective Catalytic Reduction of NOx with Ammonia. Catalysts 2020. [DOI: 10.3390/catal10121421] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Selective catalytic reduction of NOx with NH3 (NH3-SCR) has been successfully applied to abate NOx from diesel engines and coal-fired industries on a large scale. Although V2O5-WO3(MoO3)/TiO2 catalysts have been utilized in commercial applications, novel vanadia-based catalysts have been recently developed to meet the increasing requirements for low-temperature catalytic activity. In this article, recent progress on the improvement of the low-temperature activity of vanadia-based catalysts is reviewed, including modification with metal oxides and nonmetal elements and the use of novel supports, different synthesis methods, metal vanadates and specific structures. Investigation of the NH3-SCR reaction mechanism, especially at low temperatures, is also emphasized. Finally, for low-temperature NH3-SCR, some suggestions are given regarding the opportunities and challenges of vanadia-based catalysts in future research.
Collapse
|
8
|
Fabricate surface structure-stabilized Cu/BEA with hydrothermal-resistant via si-deposition for NOx abatement. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.111153] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
9
|
Qi L, Sun Z, Tang Q, Wang J, Huang T, Sun C, Gao F, Tang C, Dong L. Getting insight into the effect of CuO on red mud for the selective catalytic reduction of NO by NH 3. JOURNAL OF HAZARDOUS MATERIALS 2020; 396:122459. [PMID: 32302885 DOI: 10.1016/j.jhazmat.2020.122459] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 02/27/2020] [Accepted: 03/02/2020] [Indexed: 06/11/2023]
Abstract
A series of copper-modified red mud catalysts (CuO/PRM) with different copper oxide contents were synthesized by wet impregnation method and investigated for selective catalytic reduction of NO by NH3 (NH3-SCR). The catalytic results demonstrated that the red mud catalyst with 7 wt% CuO content exhibited the excellent catalytic performance as well as resistance to water and sulfur poisoning. The red mud support and copper-containing catalysts were characterized by XRF, XRD, N2 adsorption-desorption, HRTEM, EDS mapping, XPS, H2-TPR, NH3-TPD and in situ DRIFT. The obtained results revealed that well dispersed copper oxide originating from 1 to 7 wt% CuO contents was more facile for the redox equilibrium of Cu2+ + Fe2+ ↔ Cu+ + Fe3+ shifting to right to form Cu+ and surface oxygen species than crystalline CuO generating from high CuO loading (9 wt% CuO), which was beneficial to the enhancement of reducibility and the formation of Lewis acid sites on the catalyst surface. All these factors made significant contributions to the improvement of NH3-SCR activities for CuO/PRM catalysts. Moreover, in situ DRIFT analysis combined with DFT calculated results confirmed that the finely dispersed copper species not only enhanced the NH3 activation but also promoted the NOx desorption, which synergistically facilitated the NH3-SCR process via the Eley-Rideal mechanism.
Collapse
Affiliation(s)
- Lei Qi
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong, 250022, PR China.
| | - Zhenguo Sun
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong, 250022, PR China
| | - Qi Tang
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong, 250022, PR China
| | - Jin Wang
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong, 250022, PR China
| | - Taizhong Huang
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong, 250022, PR China
| | - Chuanzhi Sun
- School of the Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing, 210093, PR China
| | - Fei Gao
- School of the Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing, 210093, PR China
| | - Changjin Tang
- School of the Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing, 210093, PR China
| | - Lin Dong
- School of the Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing, 210093, PR China.
| |
Collapse
|
10
|
Abubakar A, Li C, Huangfu L, Gao S, Yu J. Simultaneous removal of particulates and NO by the catalytic bag filter containing V2O5-MoO3/TiO2. KOREAN J CHEM ENG 2020. [DOI: 10.1007/s11814-020-0486-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
11
|
A Comparative Study in Vanadium and Tungsten Leaching from Various Sources of SCR Catalysts with Local Difference. SUSTAINABILITY 2020. [DOI: 10.3390/su12041499] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Direct leaching with NaOH can be an economically acceptable method for vanadium (V) and tungsten (W) recovery from spent selective catalytic reduction (SCR) catalysts. However, different chemical-physical characteristics of catalysts would affect the V and W leaching. In this paper, the V and W leaching behavior of various sources of SCR catalysts with a local difference (yellow and gray color) were systematically investigated with alkali leaching solution under ambient pressure. Different leaching efficiencies from yellow and gray color areas were correlated with oxidation states and species of V and W on catalyst surfaces, as characterized by X-ray photoelectron spectroscopy (XPS), Raman, Fourier transform infrared spectroscopy (FTIR), and other analytic methods. For the V leaching efficiency, the samples from a gray area of catalysts (40.0–51.0%) were lower than that from the yellow area (66.8–69.8%). The higher molar ratio of V3+ and a lower molar ratio of V5+, and the lower total V content on the surface of the samples from the gray area could be the main reasons for the lower V leaching efficiency. As for the W leaching efficiency, the samples from the gray area (44.6–57.3%) were slightly higher than that from the yellow area (38.0–52.6%) of catalysts. The less total W content of surface species and stronger interaction among V–W–Ti of yellow area samples resulted in the lower leaching efficiency. These differential leaching efficiencies needed to be taken into consideration for recovering V and W from spent SCR catalysts.
Collapse
|
12
|
Huang X, Zhang G, Tang Z. Facile Fabrication of Ce/V-Modified Multi-Channel TiO 2 Nanotubes and Their Enhanced Selective Catalytic Reduction Performance. Chem Asian J 2020; 15:371-379. [PMID: 31833207 DOI: 10.1002/asia.201901535] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 12/11/2019] [Indexed: 11/10/2022]
Abstract
To optimize one-dimensional (1D) TiO2 nanofibers, tailor-made multi-channel TiO2 nanotubes have been successfully fabricated by electrospinning technology. After loading with Ce and V, the CeVTi-tube catalyst exhibited a broad working temperature window and acceptable resistance to H2 O and SO2 for elimination of NOx . The corresponding analysis revealed that the multi-channel structure provided more surface adsorbed oxygen species and that the wall of nanotubes anchored active components efficiently, which was beneficial to improve the stability as well as dispersion of the active components. Besides, a synergistic effect between Ce and V easily occurred at the CeVTi-tube catalyst, and its reducibility was significantly improved since the electron transformation between Ce and V was dramatically enhanced. Consequently, the tailor-made multi-channel CeVTi-tube catalyst exhibited satisfied de-NOx efficiency at the temperature range of 220-460 °C. It seemed that the multi-channel TiO2 nanotubes hold great potential as an excellent carrier for SCR catalysts.
Collapse
Affiliation(s)
- Xiaosheng Huang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100039, P. R. China
| | - Guodong Zhang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
| | - Zhicheng Tang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P. R. China.,Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P. R. China
| |
Collapse
|
13
|
Raja S, Alphin MS, Sivachandiran L. Promotional effects of modified TiO2- and carbon-supported V2O5- and MnOx-based catalysts for the selective catalytic reduction of NOx: a review. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01348j] [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
This review presents the promotional effects of transition metal modification over TiO2- and carbon-supported V2O5- and MnOx-based SCR catalysts.
Collapse
Affiliation(s)
- S. Raja
- Department of Mechanical Engineering
- Sri Sivasubramaniya Nadar College of Engineering
- Kalavakkam 603110
- India
| | - M. S. Alphin
- Department of Mechanical Engineering
- Sri Sivasubramaniya Nadar College of Engineering
- Kalavakkam 603110
- India
| | - L. Sivachandiran
- Department of chemistry
- SRM Institute of Science and Technology
- Chennai
- India
| |
Collapse
|
14
|
Liu X, Chen H, Wu X, Cao L, Jiang P, Yu Q, Ma Y. Effects of SiO2 modification on the hydrothermal stability of the V2O5/WO3–TiO2 NH3-SCR catalyst: TiO2 structure and vanadia species. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00385a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The addition of silica could produce the SixTi1−xO2 solid solutions at the interface in the doped catalyst, which inhibit the direct contact among anatase crystals and improve the stable textural property of V2O5/WO3–TiO2 catalyst.
Collapse
Affiliation(s)
- Xuesong Liu
- College of Chemistry and Chemical Engineering
- Shaoxing University
- Zhejiang 312000
- PR China
- Key Laboratory of Advanced Materials of Ministry of Education
| | - Hongfeng Chen
- Shaoxing Testing Institute of Quality and Technical Supervision
- Shaoxing
- China
| | - Xiaodong Wu
- Key Laboratory of Advanced Materials of Ministry of Education
- School of Materials Science and Engineering
- Tsinghua University
- Beijing 100084
- PR China
| | - Li Cao
- Key Laboratory of Advanced Materials of Ministry of Education
- School of Materials Science and Engineering
- Tsinghua University
- Beijing 100084
- PR China
| | - Peng Jiang
- College of Chemistry and Chemical Engineering
- Shaoxing University
- Zhejiang 312000
- PR China
| | - Qifan Yu
- College of Chemistry and Chemical Engineering
- Shaoxing University
- Zhejiang 312000
- PR China
| | - Yue Ma
- Key Laboratory of Advanced Materials of Ministry of Education
- School of Materials Science and Engineering
- Tsinghua University
- Beijing 100084
- PR China
| |
Collapse
|