Catalytic combustion of toluene with Pd/La_0.8Ce_0.2MnO₃ supported on different zeolites

Abstract

Pd/La 0.8 Ce 0.2 MnO 3 catalysts supported on various kinds of zeolites (ZSM-5, MOR, NaY, and b) were prepared by incipient wetness impregnation method, and these catalysts were investigated by Brunauer-Emmett-Teller, X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy, and H 2 -temperature programmed reduction. The catalytic activity of these catalysts was tested for toluene catalytic combustion, and the support effect was investigated. It was found that the ZSM-5 is the best support than other zeolites (MOR, NaY, and b), because it processes the higher acidity and reducibility, although its specific surface area is smaller than the others. Result of XRD indicates that Pd species are highly dispersed on the surface of the catalysts, and the doping of Pd could greatly improve the activity of La 0.8 Ce 0.2 MnO 3 , the light-off and complete conversion temperature of Pd/La 0.8 Ce 0.2 MnO 3 / ZSM-5 are only 112 and 2278C, respectively. V C 2017 American Institute of Chemical Engineers Environ Prog, 37: 215-220, 2018

Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources

“…311 Ce-based oxides are also regularly used as supports for perovskite. A series of CeO 2 materials with different morphologies (rods, cubes and polyhedrons) were synthesized by Wang et al 481 and utilized as supports for La 0.8 Ce 0.2 MnO 3 . The morphology of the CeO 2 was determined to have a critical influence on the activity of La 0.8 Ce 0.2 MnO 3 phase.…”

Advances in Catalytic Oxidation of Volatile Organic Compounds over Pd-Supported Catalysts: Recent Trends and Challenges

“…Numerous studies have demonstrated that the catalytic activity of Pd-supported catalysts is closely related to the oxidation state of Pd (Li et al, 2011;Gil et al, 2015;Zhao et al, 2016;Weng et al, 2019;Zhao X. et al, 2019). Some authors proposed that metallic Pd was more active in VOC oxidation than its oxidized state (Tidahy et al, 2008;Huang and Leung, 2011;Wang et al, 2018a;Zhao X. et al, 2019), as it can provide more active sites for the oxidation of hydrocarbons (Jinjun et al, 2005). The superior catalytic performance of Pd/ TiO 2 for HCHO oxidation relied on the metallic Pd NP with a strong capacity for oxygen activation (Huang and Leung, 2011).…”

“…The superior catalytic performance of Pd/ TiO 2 for HCHO oxidation relied on the metallic Pd NP with a strong capacity for oxygen activation (Huang and Leung, 2011). The Pd 0 species were also found to be more active than PdO for o-xylene oxidation reaction (Wang et al, 2018a). Jeong et al reported that hydrogen-treated catalysts showed higher oxidation activities than air-treated catalysts for possessing more metallic Pd (Ihm et al, 2004).…”

Investigation of LaMnO3 catalyst loaded on HZSM‐5 zeolite for CO catalytic oxidation

“…Due to the good thermal stability, eco-friendly nature, and large SSA, zeolite has been used widely as support for catalysts. 14 Wang et al 15 loaded Pd/La 0.8 Ce 0.2 MnO 3 on different zeolites by incipient wetness impregnation and found that Pd/La 0.8 Ce 0.2 MnO 3 /ZSM-5 showed the best activity. Hosseinpour et al 16 combined HY zeolite with LaBO 3 (B = Co, Mn, Fe) as catalysts for cumene cracking.…”

“…Compared with other zeolites like NaY, MOR, and Beta, ZSM-5 has more acid sites and higher reducibility, which are beneficial for the supports of efficient catalysts. 15 Because HZSM-5 zeolite has a special pore structure and large SSA, the active species could be highly dispersed on its surface and the catalytic activity could be improved. 19 To the best of our knowledge, there is no study of catalytic oxidation of CO with LaMnO 3 loaded on HZSM-5 zeolite.…”