Construction of the Low-Loading Ni/CeO2Catalyst with a Boosted CO2Methanation Performance via the Facile Pyrolysis CeO2Support

Yuan He, Haidong Shen, Yunhai Bai, Xin Niu, Yike Zhao, Chen Wu, Shaowei Yang, Yueling Cao, Qiuyu Zhang, Hepeng Zhang

科研成果: 期刊稿件文章同行评审

16 引用 (Scopus)

摘要

Ni-loaded CeO2-based materials are one type of the promising catalyst for CO2methanation; however, lowering the Ni loading, simplifying the preparation process of CeO2supports, and improving the low-temperature catalytic performance are always essential for scalable applications. Herein, an efficient CeO2support (CeO2-NC) with a large inner pore size was prepared by a facilely controlled calcination of cerium nitrate [Ce(NO3)3·6H2O] method. On the basis of CeO2-NC, one catalyst (Ni/CeO2-NC) with low Ni loading (2.56 wt %), desirable Ni dispersity, and abundant medium basic sites was developed that exhibited the amazing low-temperature CO2methanation performance. At 275 °C, CO2conversion reached up to 77.7% with an almost 100% CH4selectivity under a high gas hourly space velocity of 60000 mL gcat-1h-1, and the Ni-based mass-specific CH4formation rate at 300 °C was up to 4740 μmol gNi-1s-1, outperforming most of the reported Ni-based catalysts to date. The in situ diffuse-reflectance infrared Fourier transform spectroscopy experiments revealed that plentiful active bidentate carbonate intermediates and effective suppression of the dissociated active H species recombination contributed to the boosted CO2methanation performance of Ni/CeO2-NC at low temperatures. Moreover, the mechanism was also inferred. This work provides new insight into simple pyrolysis CeO2supports and should be of significance for the rational design of highly efficient CO2methanation catalysts.

源语言英语
页(从-至)15948-15960
页数13
期刊Industrial and Engineering Chemistry Research
61
43
DOI
出版状态已出版 - 2 11月 2022

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