| Title: | Efficient Catalytic Combustion of Cyclohexane over PdAg/Fe(2)O(3) Catalysts under Low-Temperature Conditions: Establishing the Degradation Mechanism Using PTR-TOF-MS and in Situ DRIFTS |
| Author(s): | Liu Q; Wen M; Guo Y; Song S; Li G; An T; |
| Address: | "Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China. Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China" |
| Journal Title: | ACS Appl Mater Interfaces |
| ISSN/ISBN: | 1944-8252 (Electronic) 1944-8244 (Linking) |
| Abstract: | "Cyclohexane, a typical volatile organic compound (VOC), poses high risks to the environment and humans. Herein, synthesized PdAg/Fe(2)O(3) catalysts exhibited exceptional catalytic performance for cyclohexane combustion at lower temperatures (50% mineralization temperature (T(50)) of 199 degrees C, 90% mineralization temperature (T(90)) of 315 degrees C) than Pd/Fe(2)O(3) (T(50) of 262 degrees C, T(90) of 335 degrees C) and Fe(2)O(3) (T(50) of 305 degrees C, T(90) of 360 degrees C). In addition, PdAg/Fe(2)O(3) displayed enhanced stability by alloying Ag with Pd. The redox and acidity of the PdAg/Fe(2)O(3) were studied by XPS, H(2)-TPR, and NH(3)-TPD. In situ diffuse reflectance infrared Fourier transform spectroscopy and proton-transfer-reaction time-of-flight mass spectrometry were applied to identify the intermediates formed on the catalyst surface and in the tail gas during oxidation, respectively. Results suggested that loading PdAg onto Fe(2)O(3) significantly enhanced the adsorption and activation of oxygen and cyclohexane, oxidative dehydrogenation of cyclohexane to benzene, and catalytic cracking of cyclohexane to olefins at low temperatures. This in-depth study will benefit the design and application of efficient catalysts for the effective combustion of VOCs at low temperatures" |
| Keywords: | PdAg/Fe2O3 catalysts catalytic combustion cyclohexane degradation intermediates and mechanism degradation kinetics; |
| Notes: | "PubMed-not-MEDLINELiu, Qiuxia Wen, Meicheng Guo, Yunlong Song, Shengnan Li, Guiying An, Taicheng eng 2022/12/02 ACS Appl Mater Interfaces. 2022 Dec 21; 14(50):55503-55516. doi: 10.1021/acsami.2c14515. Epub 2022 Dec 1" |
