期刊
CHEMICAL ENGINEERING JOURNAL
卷 393, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124717
关键词
Volatile organic compounds; Catalytic combustion; Propane total degradation; Zeolite confinement; Sinter resistance; Adsorption/catalysis bifunctional catalyst
资金
- National Natural Science Foundation of China [21976078, 21922606, 21876139, 21773106]
- National Key R&D Program of China [2016YFC0205900]
- Natural Science Foundation of Jiangxi Province [20181BCD4004]
- Foundation of State Key Laboratory of High-efficiency Utilization of Coal & Green Chemical Engineering [2018-K04]
Volatile organic compounds (VOCs) are significant ozone (O-3) and particulate matter (PM) formation precursors and are deleterious to both human health and environment. Catalytic combustion can degrade VOCs to H2O and CO2 without secondary pollution, suggesting a potential sustainable technology for air pollution control. However, the concentration of exhausted VOCs is usually too low for effective decomposition. Herein, a novel adsorption/catalysis bifunctional catalyst, hierarchical silicalite-1 (S-1) zeolite enveloping Pd-CeO2 nanowires (Pd-CeO2NW@S-1), was designed and prepared using a simple one-pot two-step method and applied for the degradation of propane. Pd-CeO2NW@S-1 exhibited superior catalytic activity (T-90 decreased to 296 degrees C) as well as increased thermal and hydrothermal stability (no obviously decrease in activity when treated at 700 degrees C or reacted with water gas, respectively) compared with Pd-CeO2 nanowires supported on the outer surface of S-1 (Pd-CeO2NW/S-1) and previously reported Pd based catalysts for propane degradation. In addition, the activity over Pd-CeO2NW@S-1 after five reaction cycles just with little decrease and could be restored by a simple regeneration step and without any detection of coke. The remarkable performance over Pd-CeO2NW@S-1 was attributed to the high dispersion of Pd and Ce encapsulated in hierarchical zeolite with superior propane adsorption performance and the special confinement structure according the Mars-van-Krevelen (MvK) mechanism. This confinement adsorption/catalysis bifunctional strategy can be used to design other high-performance catalysts for degradation of VOCs.
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