1
|
Dong N, Ye Q, Zhang D, Xiao Y, Dai H. Reduced graphene oxide as an effective promoter to the layered manganese oxide-supported Ag catalysts for the oxidation of ethyl acetate and carbon monoxide. JOURNAL OF HAZARDOUS MATERIALS 2022; 431:128518. [PMID: 35219061 DOI: 10.1016/j.jhazmat.2022.128518] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Revised: 02/09/2022] [Accepted: 02/17/2022] [Indexed: 06/14/2023]
Abstract
The layered manganese oxide (δ-MnO2)-supported reduced graphene oxide (rGO)-promoted silver catalysts (xAg- yrGO/δ-MnO2; x and y are the Ag and rGO contents (wt%), respectively) were prepared via a polyvinyl alcohol-protected reduction route. Physicochemical properties of these materials were determined using the numerous techniques, and their catalytic activities were evaluated for the oxidation of CO and ethyl acetate. It is found that the loading of rGO as an electron transfer promoter could significantly strengthen the metal-support interaction (SMSI) between Ag and δ-MnO2 and increase specific surface area of the sample, hence improving catalytic performance of the sample. Activity evaluation reveals that 1Ag- 1.0rGO/δ-MnO2 showed the best catalytic activity and the lowest apparent activation energy (Ea), giving a T90% of 140 °C and an Ea of 42.7 kJ/mol for CO oxidation, and a T90% of 160 °C and an Ea of 39.8 kJ/mol for ethyl acetate oxidation at space velocity (SV) = 60,000 mL/(g h). The good performance of 1Ag- 1.0rGO/δ-MnO2 was associated with its high Mn3+/Mn4+ or Oads/Olatt molar ratio, good low-temperature reducibility, and strong SMSI between Ag and δ-MnO2. The in situ DRIFTS characterization demonstrates that the carbonate and acetate species were the main intermediate products in CO and ethyl acetate oxidation over 1Ag- 1.0rGO/δ-MnO2, respectively. The 1Ag- 1.0rGO/δ-MnO2 sample was not significantly altered in physicochemical property after 55 h of stability test, but its activity decreased in the presence of water vapor, especially such an effect on ethyl acetate oxidation was more obvious, which was possibly due to the competitive adsorption of water and reactants on the catalyst surface.
Collapse
Affiliation(s)
- Ning Dong
- Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Qing Ye
- Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China.
| | - Dan Zhang
- Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Yang Xiao
- Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Hongxing Dai
- Beijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing 100124, China; Laboratory of Catalysis Chemistry and Nanoscience, Department of Environmental Chemical Engineering, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China.
| |
Collapse
|
2
|
Wang Y, Bi F, Wang Y, Jia M, Tao X, Jin Y, Zhang X. MOF-derived CeO2 supported Ag catalysts for toluene oxidation: The effect of synthesis method. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111922] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
3
|
Qiao G, Xu Q, Wang A, Zhou D, Yin J. Efficient synthesis of sub-5 nm Ag nanoparticles by the desorption effect of supercritical CO 2 in SBA-15. NANOTECHNOLOGY 2020; 31:375603. [PMID: 32460263 DOI: 10.1088/1361-6528/ab96e7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Herein, the desorption effect of supercritical CO2 (scCO2) was utilized to obtain sub-5 nm Ag nanoparticles (NPs) with a high Ag loading in SBA-15. The size of the Ag NPs decreased from 3.54 ± 0.79 nm (Ag loading of 25.3 wt.% wt.%) to 2.38 ± 0.68 (Ag loading of 10.5 wt%) nm by changing the depressurization curve from 0.1 MPa min-1 (20-14 MPa) to 3 MPa min-1 (20-12 MPa). Meanwhile, the intensity of the crystalline Ag characteristic peaks was obviously higher than the latter sample from the x-ray diffraction (XRD) patterns. However, compared with the adsorption kinetics of the two precursors of AgNO3 and Cu(NO3)2 on SBA-15, under the same deposition and depressurization conditions, when the two depositional systems used water as a co-solvent, the time taken to reach the adsorption equilibrium of Ag+ on the supports was longer than the time taken by Cu2+, which existed in the water as [Cu(H2O)4]2+. The surface of SBA-15 was hydrophilic, and then the interaction of Ag+ and the surface was weaker compared with Cu2+, making Ag+ highly dispersed on the surface under the scCO2 desorption effect. After calcination, the size of the Ag NPs decreased, but the morphology of CuO was mainly characterized by nanorods (NRs). Moreover, by comparing the experiments of wetness impregnation, the dispersion ability of the bulk scCO2 of the reactor was inefficient for Ag+ adsorbed on the channels in the depressurization process.
Collapse
Affiliation(s)
- Guoyue Qiao
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
| | | | | | | | | |
Collapse
|
4
|
|
5
|
Mamontov G, Gorbunova A, Vyshegorodtseva E, Zaikovskii V, Vodyankina O. Selective oxidation of CO in the presence of propylene over Ag/MCM-41 catalyst. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.05.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
6
|
Li X, Zhao L, Shao C, Li X, Sun W, Liu Y. Immobilization of ultrafine Ag nanoparticles on well-designed hierarchically porous silica for high-performance catalysis. J Colloid Interface Sci 2018; 530:345-352. [PMID: 29982027 DOI: 10.1016/j.jcis.2018.06.045] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Revised: 06/14/2018] [Accepted: 06/19/2018] [Indexed: 01/21/2023]
Abstract
Catalyst immobilization is of much significance not only for maintaining the high activity of the ultrafine catalyst, but also for the separation of catalyst during the practical application. Herein, a novel support material, three-dimensional hierarchically porous silica (HPS) with interconnected micro-meso-macro pores and high specific surface area was successfully fabricated though a freeze-drying technique in the presence of poly(vinyl alcohol) (PVA) and subsequent calcination process. A series of characterizations revealed that the specific surface area of HPS can be well adjusted by changing the addition of PVA. The specific surface area of HPS was as high as 360 m2 g-1, which was 211-fold higher than HPS-0 (silica prepared without using PVA). To demonstrate the potential application of such novel support material, highly dispersed silver nanoparticles (AgNPs) were immobilized on the surfaces of HPS and HPS-0 through in-situ reduction. By contrast, the catalytic activity of AgNPs anchored on HPS (531 s-1 g-1) was about 42-fold higher than that of AgNPs anchored on HPS-0 (12.67 s-1 g-1). The significantly enhanced catalytic activity of AgNPs/HPS was believed to be related to their high specific surface area and interconnected macroporous scaffolds, which could provide numerous reactive sites and mass transfer routes for the reactants.
Collapse
Affiliation(s)
- Xiaowei Li
- Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory of UV-Emitting Materials and Technology (Northeast Normal University), Ministry of Education, 5268 Renmin Street, Changchun 130024, China
| | - Ling Zhao
- Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory of UV-Emitting Materials and Technology (Northeast Normal University), Ministry of Education, 5268 Renmin Street, Changchun 130024, China
| | - Changlu Shao
- Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory of UV-Emitting Materials and Technology (Northeast Normal University), Ministry of Education, 5268 Renmin Street, Changchun 130024, China.
| | - Xinghua Li
- Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory of UV-Emitting Materials and Technology (Northeast Normal University), Ministry of Education, 5268 Renmin Street, Changchun 130024, China.
| | - Wei Sun
- Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory of UV-Emitting Materials and Technology (Northeast Normal University), Ministry of Education, 5268 Renmin Street, Changchun 130024, China
| | - Yichun Liu
- Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory of UV-Emitting Materials and Technology (Northeast Normal University), Ministry of Education, 5268 Renmin Street, Changchun 130024, China
| |
Collapse
|
7
|
High and stable catalytic activity of Ag/Fe 2 O 3 catalysts derived from MOFs for CO oxidation. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2018.01.007] [Citation(s) in RCA: 135] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
8
|
Yang Y, Dong H, Wang Y, He C, Wang Y, Zhang X. Synthesis of octahedral like Cu-BTC derivatives derived from MOF calcined under different atmosphere for application in CO oxidation. J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2017.11.033] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
9
|
Yang Y, Dong H, Wang Y, Wang Y, Liu N, Wang D, Zhang X. A facile synthesis for porous CuO/Cu2O composites derived from MOFs and their superior catalytic performance for CO oxidation. INORG CHEM COMMUN 2017. [DOI: 10.1016/j.inoche.2017.09.027] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
10
|
Qin Y, Qu Z, Dong C, Huang N. Effect of pretreatment conditions on catalytic activity of Ag/SBA-15 catalyst for toluene oxidation. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(17)62842-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
11
|
Lu F, Xu Y, Jiang X, Liu Y, Huang J, Sun D. Biosynthesized Pd/γ-Al2O3 catalysts for low-temperature 1,3-butadiene hydrogenation: the effect of calcination atmosphere. NEW J CHEM 2017. [DOI: 10.1039/c7nj02557b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of pretreatment atmosphere on 1,3-butadiene hydrogenation over biosynthesized Pd/γ-Al2O3 catalysts was reported.
Collapse
Affiliation(s)
- Fenfen Lu
- College of Chemistry & Materials Science
- Longyan University
- Longyan
- P. R. China
| | - Yan Xu
- Department of Chemical and Biochemical Engineering
- College of Chemistry and Chemical Engineering
- Fujian Provincial Key Laboratory of Chemical Biology
- Xiamen University
- Xiamen
| | - Xia Jiang
- Department of Chemical and Biochemical Engineering
- College of Chemistry and Chemical Engineering
- Fujian Provincial Key Laboratory of Chemical Biology
- Xiamen University
- Xiamen
| | - Yang Liu
- Department of Chemical and Biochemical Engineering
- College of Chemistry and Chemical Engineering
- Fujian Provincial Key Laboratory of Chemical Biology
- Xiamen University
- Xiamen
| | - Jiale Huang
- Department of Chemical and Biochemical Engineering
- College of Chemistry and Chemical Engineering
- Fujian Provincial Key Laboratory of Chemical Biology
- Xiamen University
- Xiamen
| | - Daohua Sun
- Department of Chemical and Biochemical Engineering
- College of Chemistry and Chemical Engineering
- Fujian Provincial Key Laboratory of Chemical Biology
- Xiamen University
- Xiamen
| |
Collapse
|
12
|
Feng X, Li H, Zhang Q, Zhang P, Song X, Liu J, Zhao L, Gao L. SiO 2-Ag-SiO 2 core/shell structure with a high density of Ag nanoparticles for CO oxidation catalysis. NANOTECHNOLOGY 2016; 27:455605. [PMID: 27727146 DOI: 10.1088/0957-4484/27/45/455605] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
SiO2-Ag-SiO2, a sandwiched core/shell structure with a layer of Ag nanoparticles (∼4 nm) encapsulated between a shallow SiO2 surface layer and a SiO2 submicrosphere substrate (∼200 nm), has been synthesized from [Formula: see text] and SiO2 spheres by a facile one-pot hydrothermal method. The composite is proposed to result from the dynamic balance between the [Formula: see text] reduction and the dissolution-redeposition of SiO2 in mild basic media. The synthetic mechanism and the roles of the reaction time, temperature, and the amount of ammonia in the formation of this unique structure are investigated and discussed. The composite structure shows superior catalytic performance in CO oxidation to the control Ag/SiO2 structure prepared by impregnation. Pre-treatment by O2 at 600 °C significantly improves the catalytic performance of the composite structure and preserves the nanocomposite structure well.
Collapse
Affiliation(s)
- Xiaoqian Feng
- State Key Laboratory for Metallic Matrix Composite Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | | | | | | | | | | | | | | |
Collapse
|
13
|
Xu P, Liang J, Cao X, Tang J, Gao J, Wang L, Shao W, Gao Q, Li W, Teng Z. Ag-deposited hollow mesoporous silica microspheres for rapid decolorizing of dye pollutants. RESEARCH ON CHEMICAL INTERMEDIATES 2016. [DOI: 10.1007/s11164-016-2598-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
14
|
ZHANG X, QU Z, YU F, WANG Y. Progress in carbon monoxide oxidation over nanosized Ag catalysts. CHINESE JOURNAL OF CATALYSIS 2013. [DOI: 10.1016/s1872-2067(12)60610-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|