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

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Abstract

La0.67Fe0.83Cu0.17O3 with perovskite structure was prepared by sol–gel method, and 1.5 wt% Pd/Al2O3 was prepared by initial wet impregnation method. Pd/Al2O3 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/Al2O3 catalyst. In theoretical air–fuel ratio conditions (\(\lambda\)=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, CH4 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 CH4. The catalysts were also investigated by N2-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 N2 selection in the presence of CH4 and H2O, resulting in lower ammonia formation. Our work provided a new method for reducing ammonia formation over TWC catalysts for stoichiometric natural gas vehicles.

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Acknowledgements

The work is supported by the National of Natural Science Foundation of China (Grant No. 61873102) Chengdu Science and Technology Bureau (Grant No. 2018-YF05-00053-SN) and Sichuan Science and Technology Project (Grant No. 2020KJT0026-2019ZDZX0025).

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Authors and Affiliations

  1. School of Chemical Engineering, Sichuan University, Chengdu, 610064, People’s Republic of China

    Puqing Shen, Guochen Zhang, Xi Liu, Yang Xu, Yaoqiang Chen & Lin Zhong

  2. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, 610064, People’s Republic of China

    Yang Wu & Yaoqiang Chen

  3. College of Chemistry, Sichuan University, Chengdu, 610064, People’s Republic of China

    Yaliu Zhang & Yaoqiang Chen

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  1. Puqing Shen
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  2. Guochen Zhang
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Correspondence to Lin Zhong.

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Shen, P., Zhang, G., Wu, Y. et al. Pd-Based Catalyst on Alumina with Perovskite (La0.67Fe0.83Cu0.17O3) to Reduce Ammonia Content in Natural Gas Exhaust. Catal Lett 151, 3582–3591 (2021). https://doi.org/10.1007/s10562-021-03598-5

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