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Tailorable Formation of Hierarchical Structure Silica (HMS) and Its Application in Hydrogen Production. Catalysts 2022. [DOI: 10.3390/catal12091061] [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
Relentless endeavors have been committed to seeking simple structure-directing agents for synthesizing hierarchical mesoporous silica (HMS) materials but remaining challenges. In this contribution, we offered an improved one-pot hydrothermal route to prepare HMS materials using a single non-ionic triblock copolymer (F127) structure-directing agent under a mild polycarboxylic (citric acid) mediated condition. Via studies of key synthetic parameters including acid concentration, crystallization temperature and aging time, it was found that citric acid medium presents an important bridging effect under the optimal concentration from 0.018 M (pH = 2.57) to 1.82 M (pH = 1.09), contributing to the self-assemblage of partially protonated non-ionic triblock copolymer and tetraethyl orthosilicate (TEOS) into a high-quality multistage structure of silica materials. The specific surface area (SSA) of HMS shows a volcanic trend and is closely associated with the concentration of citric acid while the highest SSA of 739.9 m2/g can be achieved at the citric concentration of 0.28 M. Moreover, the as-synthesized HMS-CTA supported Ni/CeO2 catalysts indicate an excellent production of hydrogen through dry reforming of methane (DRM) reaction over 172 h stability. The improved, facile synthesis strategy under polycarboxylic medium displays an expanded perspective for synthesizing other mesoporous materials in a wide range of applications such as catalytic material carriers and drug inhibitors.
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Zhang K, Ding H, Pan W, Mu X, Qiu K, Ma J, Zhao Y, Song J, Zhang Z. Research Progress of a Composite Metal Oxide Catalyst for VOC Degradation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:9220-9236. [PMID: 35580211 DOI: 10.1021/acs.est.2c02772] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Volatile organic compounds (VOCs) are atmospheric pollutants that have been of concern for researchers in recent years because they are toxic, difficult to remove, and widely sourced and easily cause damage to the environment and human body. Most scholars use low-temperature plasma biological treatment, catalytic oxidation, adsorption, condensation, and recovery techniques to treat then effectively. Among them, catalytic oxidation technology has the advantages of a high catalytic efficiency, low energy consumption, high safety factor, high treatment efficiency, and less secondary pollution; it is currently widely used for VOC degradation technology. In this paper, the catalytic oxidation technology for the degradation of multiple types of VOCs as well as the development of a single metal oxide catalyst have been briefly introduced. We also focus on the research progress of composite metal oxide catalysts for the removal of VOCs by comparing and analyzing the metal component ratio, preparation method, and types of precursors and the catalysts' influence on the catalytic performance. In addition, the reason for catalyst deactivation and a correlation between the chemical state of the catalyst and the electron distribution are discussed. Development of a composite metal oxide catalyst for the catalytic oxidation of VOCs has been proposed.
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Affiliation(s)
- Kai Zhang
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
| | - Honglei Ding
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
- Shanghai Power Environmental Protection Engineering Technology Research Center, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
- Key Laboratory of Environmental Protection Technology for Clean Power Generation, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
| | - Weiguo Pan
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
- Shanghai Power Environmental Protection Engineering Technology Research Center, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
- Key Laboratory of Environmental Protection Technology for Clean Power Generation, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
| | - Xiaotian Mu
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
| | - Kaina Qiu
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
| | - Junchi Ma
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
| | - Yuetong Zhao
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
| | - Jie Song
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
| | - Ziyi Zhang
- College of Energy and Mechanical Engineering, Shanghai University of Electric Power, No. 2588 Changyang Road, Yangpu District, Shanghai 201306, China
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Reaction Kinetics and Mechanism of VOCs Combustion on Mn-Ce-SBA-15. Catalysts 2022. [DOI: 10.3390/catal12060583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A propane combustion catalyst based on Mn and Ce and supported by SBA-15 was prepared by the “two-solvents’’ method aiming at the possible application in catalytic converters for abatement of alkanes in waste (exhaust) gases. The catalyst characterization was carried out by SAXS, N2-physisorption, XRD, TEM, XPS, EPR and H2-TPR methods. The catalysts’ performance was evaluated by tests on the combustion of methane, propane and butane. The reaction kinetics investigation showed that the reaction orders towards propane and oxygen were 0.7 and 0.1, respectively. The negative reaction order towards the water (−0.3) shows an inhibiting effect on the water molecules. Based on the data from the instrumental methods, catalytic experiments and mathematic modeling of the reaction kinetics, one may conclude that the Mars–van Krevelen type of mechanism is the most probable for the reaction of complete propane oxidation over single Mn and bi-component Mn–Ce catalysts. The fine dispersion of manganese and cerium oxide and their strong interaction inside the channels of the SBA-15 molecular sieve leads to the formation of difficult to reduce oxide phases and consequently, to lower catalytic activity compared to the mono-component manganese oxide catalyst. It was confirmed that the meso-structure was not modified during the catalytic reaction, thus it can prevent the agglomeration of the oxide particles.
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Wang J, Wang P, Wu Z, Yu T, Abudula A, Sun M, Ma X, Guan G. Mesoporous catalysts for catalytic oxidation of volatile organic compounds: preparations, mechanisms and applications. REV CHEM ENG 2022. [DOI: 10.1515/revce-2021-0029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Volatile organic compounds (VOCs) are mainly derived from human activities, but they are harmful to the environment and our health. Catalytic oxidation is the most economical and efficient method to convert VOCs into harmless substances of water and carbon dioxide at relatively low temperatures among the existing techniques. Supporting noble metal and/or transition metal oxide catalysts on the porous materials and direct preparation of mesoporous catalysts are two efficient ways to obtain effective catalysts for the catalytic oxidation of VOCs. This review focuses on the preparation methods for noble-metal-based and transition-metal-oxide-based mesoporous catalysts, the reaction mechanisms of the catalytic oxidations of VOCs over them, the catalyst deactivation/regeneration, and the applications of such catalysts for VOCs removal. It is expected to provide guidance for the design, preparation and application of effective mesoporous catalysts with superior activity, high stability and low cost for the VOCs removal at lower temperatures.
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Affiliation(s)
- Jing Wang
- School of Chemical Engineering , Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources; Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy; Shaanxi Research Center of Engineering Technology for Clean Coal Conversion; and Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi , Xi’an 710069 , Shaanxi , China
| | - Peifen Wang
- Graduate School of Science and Technology , Hirosaki University , 1-Bunkyocho , Hirosaki 036-8560 , Aomori , Japan
| | - Zhijun Wu
- Graduate School of Science and Technology , Hirosaki University , 1-Bunkyocho , Hirosaki 036-8560 , Aomori , Japan
| | - Tao Yu
- Graduate School of Science and Technology , Hirosaki University , 1-Bunkyocho , Hirosaki 036-8560 , Aomori , Japan
| | - Abuliti Abudula
- Graduate School of Science and Technology , Hirosaki University , 1-Bunkyocho , Hirosaki 036-8560 , Aomori , Japan
| | - Ming Sun
- School of Chemical Engineering , Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources; Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy; Shaanxi Research Center of Engineering Technology for Clean Coal Conversion; and Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi , Xi’an 710069 , Shaanxi , China
| | - Xiaoxun Ma
- School of Chemical Engineering , Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources; Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy; Shaanxi Research Center of Engineering Technology for Clean Coal Conversion; and Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi , Xi’an 710069 , Shaanxi , China
| | - Guoqing Guan
- Graduate School of Science and Technology , Hirosaki University , 1-Bunkyocho , Hirosaki 036-8560 , Aomori , Japan
- Energy Conversion Engineering Laboratory , Institute of Regional Innovation (IRI), Hirosaki University , 2-1-3 Matsubara , Aomori 030-0813 , Japan
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He J, Zheng F, Zhou Y, Li X, Wang Y, Xiao J, Li Y, Chen D, Lu J. Catalytic oxidation of VOCs over 3D@2D Pd/CoMn 2O 4 nanosheets supported on hollow Al 2O 3 microspheres. J Colloid Interface Sci 2022; 613:155-167. [PMID: 35033762 DOI: 10.1016/j.jcis.2022.01.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/03/2022] [Accepted: 01/04/2022] [Indexed: 01/07/2023]
Abstract
Catalytic oxidation is a promising method for removing harmful volatile organic compounds (VOCs). Therefore, exploring high-efficiency catalysts for catalyzing VOCs is of great significance to the realization of an environment-friendly and sustainable society. Here, a series of 3D@2D constructed Al2O3@CoMn2O4 microspheres with a hollow hierarchical structure supporting Pd nanoparticles was successfully synthesized. The introduction of hollow Al2O3 for the in situ vertical growth of 2D CMO spinel materials constructs a well-defined core - shell hollow hierarchical structure, leading to larger specific surface area, more accessible active sites and promoted catalytic activity of support material. Additionally, theoretical calculations also indicate that the addition of Al2O3 as the support material strengthens the adsorption of toluene and oxygen on CoMn2O4, which promotes their activation. The dispersion of Pd further strengthens the low-temperature reducibility along with more active surface oxygen species and lower apparent activation energy. The optimum 1 wt% Pd/h-Al@4CMO catalyst possesses the lowest apparent activation energy for toluene of 77.4 kJ mol-1, showing the relatively best catalytic activity for VOC oxidation, reaching 100% toluene, benzene, and ethyl acetate conversion at 165, 160, and 155 °C, respectively. Meanwhile, the 1 wt% Pd/h-Al@4CMO sample possesses excellent catalytic stability, outstanding selectivity, and good moisture tolerance, which is an effective candidate for eliminating VOCs contaminants.
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Affiliation(s)
- Jiaqin He
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, PR China
| | - Fangfang Zheng
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, PR China
| | - Yuanbo Zhou
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, PR China
| | - Xunxun Li
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, PR China
| | - Yaru Wang
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, PR China
| | - Jun Xiao
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, PR China
| | - Youyong Li
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, PR China
| | - Dongyun Chen
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, PR China.
| | - Jianmei Lu
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, PR China.
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Abstract
Reported here are new data on the structural and catalytic properties of a series of mono-component cobalt and bi-component Co–Ce catalysts supported on SBA-15 (Santa Barbara Amorphous-15)). The catalysts performance has been evaluated by tests on combustion of methane, propane, and n-hexane. It was established that the preparation of the Co–Ce catalysts by the ‘two-solvent’ technique does not significantly change the mesoporous structure, however, its pores are clogging with the Co and Ce guest species. Cobalt and cerium are uniformly distributed and preferentially fill up the channels of SBA-15, but oxide agglomerates located on the surface are observed as well. The highest activity of the mono-component cobalt sample is explained by its higher reducibility as a result of lower interaction of the cobalt oxide with the SBA-15. The fine dispersion of cobalt and cerium oxide and their strong interaction in the channels of the SBA-15 molecular sieve, leads to the formation of difficult-to-reduce oxide phases and, consequently, to lower catalytic activity compared to monocomponent cobalt oxide catalyst. The synthesised mesoporous structure can prevent the agglomeration of the oxide particles, thus leading to the successful development of a new and stable catalyst for decreasing greenhouse gas emissions.
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Bao J, Cheng J, Wang X, Yang S, Zhang P. Mechanochemical redox: a calcination-free process to support CoMnO x catalysts. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01121e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A calcination-free process (mechanochemical redox loading method) to load CoMnOx onto various supports for efficient and stable CO oxidation.
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Affiliation(s)
- Jiafeng Bao
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Jinbin Cheng
- The 718th Research Institute of China State Shipbuilding Corporation Limited
- Handan City
- China
| | - Xueming Wang
- The 718th Research Institute of China State Shipbuilding Corporation Limited
- Handan City
- China
| | - Shize Yang
- Eyring Materials Center
- Arizona State University
- Tempe
- USA
| | - Pengfei Zhang
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
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