Pd-Based Catalyst on Alumina with Perovskite (La0.67Fe0.83Cu0.17O3) to Reduce Ammonia Content in Natural Gas Exhaust

La 0.67 Fe 0.83 Cu 0.17 O 3 with perovskite structure was prepared by sol–gel method, and 1.5 wt% Pd/Al 2 O 3 was prepared by initial wet impregnation method. Pd/Al 2 O 3 and perovskite prepared above were mixed by mechanical ball-milling with mass ratios of 10:1, 5:1 and 3:1, respectively, and repr...

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Published in:Catalysis letters 2021-12, Vol.151 (12), p.3582-3591
Main Authors: Shen, Puqing, Zhang, Guochen, Wu, Yang, Zhang, Yaliu, Liu, Xi, Xu, Yang, Chen, Yaoqiang, Zhong, Lin
Format: Article
Language:English
Subjects:
Air-fuel ratio
Aluminum compounds
Aluminum oxide
Ammonia
Ball milling
Carbon monoxide
Catalysis
Catalysts
Chemisorption
Chemistry
Chemistry and Materials Science
Exhaust gases
Gas industry
Gas mixtures
Gases
Industrial Chemistry/Chemical Engineering
Mass ratios
Methane
Natural gas
Natural gas vehicles
Organometallic Chemistry
Palladium
Palladium catalysts
Perovskite
Perovskite structure
Perovskites
Physical Chemistry
Sol-gel processes
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Summary:La 0.67 Fe 0.83 Cu 0.17 O 3 with perovskite structure was prepared by sol–gel method, and 1.5 wt% Pd/Al 2 O 3 was prepared by initial wet impregnation method. Pd/Al 2 O 3 and perovskite prepared above were mixed by mechanical ball-milling with mass ratios of 10:1, 5:1 and 3:1, respectively, and represented by 10Pd/Al-La, 5Pd/Al-La and 3Pd/Al-La. Pd/Al refers to Pd/Al 2 O 3 catalyst. In theoretical air–fuel ratio conditions ( λ =1), the simulation of chemical metering of natural gas vehicle exhaust gas mixture on the catalysts were tested. The results showed that the perovskite could significantly reduce the ammonia formation in the exhaust gas. Moreover, the three-way catalytic performance of Pd/Al and 3Pd/Al-La were also tested in the feeds without water, CH 4 or CO. The results demonstrated that the perovskite greatly reduced the ammonia content in the three exhaust gases. However, the ammonia content over bare Pd/Al was much higher in the presence of CO, and almost no ammonia was generated in the absence of CH 4 . The catalysts were also investigated by N 2 -physisorption, CO-chemisorption, XRD, EDX mapping and XPS techniques. The results showed that the perovskite may promote the reaction of NO and CO towards high N 2 selection in the presence of CH 4 and H 2 O, resulting in lower ammonia formation. Our work provided a new method for reducing ammonia formation over TWC catalysts for stoichiometric natural gas vehicles. Graphic Abstract
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-021-03598-5