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J Environ Sci (China)

Title:		Pd/silicalite-1: An highly active catalyst for the oxidative removal of toluene
Author(s):		Wu L; Deng J; Liu Y; Jing L; Yu X; Zhang X; Gao R; Pei W; Hao X; Rastegarpanah A; Hongxing D;
Address:		"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, 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. 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, 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. Electronic address: hxdai@bjut.edu.cn"
Journal Title:		J Environ Sci (China)
Year:		2022
Volume:		20211229
Issue:
Page Number:		209 - 219
DOI:		10.1016/j.jes.2021.12.015
ISSN/ISBN:		1001-0742 (Print) 1001-0742 (Linking)
Abstract:		"Catalytic combustion is thought as an efficient and economic pathway to remove volatile organic compounds, and its critical issue is the development of high-performance catalytic materials. In this work, we used the in situ synthesis method to prepare the silicalite-1 (S-1)-supported Pd nanoparticles (NPs). It is found that the as-prepared catalysts displayed a hexagonal prism morphology and a surface area of 390-440 m(2)/g. The sample (0.28Pd/S-1-H) derived after reduction at 500 degrees C in 10 vol% H(2) showed the best catalytic activity for toluene combustion (T(50%) = 180 degrees C and T(90%) = 189 degrees C at a space velocity of 40,000 mL/(g.hr), turnover frequency (TOF(Pd)) at 160 degrees C = 3.46 x 10(-3) sec(-1), and specific reaction rate at 160 degrees C = 63.8 micromol/(g(Pd).sec)), with the apparent activation energy (41 kJ/mol) obtained over the best-performing 0.28Pd/S-1-H sample being much lower than those (51-70 kJ/mol) obtained over the other samples (0.28Pd/S-1-A derived from calcination at 500 degrees C in air, 0.26Pd/S-1-im derived from the impregnation route, and 0.27Pd/ZSM-5-H prepared after reduction at 500 degrees C in 10 vol% H(2)). Furthermore, the 0.28Pd/S-1-H sample possessed good thermal stability and its partial deactivation due to CO(2) or H(2)O introduction was reversible, but SO(2) addition resulted in an irreversible deactivation. The possible pathways of toluene oxidation over 0.28Pd/S-1-H was toluene --> p-methylbenzoquinone --> maleic anhydride, benzoic acid, benzaldehyde --> carbon dioxide and water. We conclude that the good dispersion of Pd NPs, high adsorption oxygen species concentration, large toluene adsorption capacity, strong acidity, and more Pd(0) species were responsible for the good catalytic performance of 0.28Pd/S-1-H"
Keywords:		Catalysis Oxidation-Reduction Oxidative Stress *Oxides *Toluene Hexagonal prism shape Silicalite-1 Supported palladium catalyst Toluene combustion Volatile organic compound;
Notes:		"MedlineWu, Linke Deng, Jiguang Liu, Yuxi Jing, Lin Yu, Xiaohui Zhang, Xing Gao, Ruyi Pei, Wenbo Hao, Xiuqing Rastegarpanah, Ali Hongxing Dai eng Netherlands 2022/02/28 J Environ Sci (China). 2022 Jun; 116:209-219. doi: 10.1016/j.jes.2021.12.015. Epub 2021 Dec 29"