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Pd/CeCoOx催化剂上Pd组分分散性改进及其NGVs尾气净化性能
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桂林理工大学化学与生物工程学院

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TK09

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广西创新驱动发展专项(科技重大专项)(桂科AA18118010)


Improvement of Pd dispersion and purification performance of NGVs exhaust on Pd/CeCoOx catalyst
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College of Chemistry and Bioengineering, Guilin University of Technology

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广西创新驱动发展专项(科技重大专项)(桂科AA18118010)

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    摘要:

    近年来,天然气汽车(NGVs)尾气净化三效催化剂的研究主要集中在具有高分散性的负载型贵金属催化剂。本文利用金属有机骨架(MOFs)模板法制备了纳米结构的CeCoOx复合氧化物作为载体,并与传统溶胶-凝胶法(SG)制备的铈钴氧化物比较,探究了贵金属Pd在两种催化剂载体上的分散状态及其对催化性能的影响。结果表明,以CeCo-MOFs材料为前驱体衍生制备的Pd/CeCoOx(M)催化剂其CO、NO、CH4三效催化性能相比溶胶-凝胶法制备的相同组成Pd/CeCoOx(SG)催化剂低了约100 ℃左右,具有更低的低温活性。以CeCo-MOFs为前驱体衍生制备的铈钴复合氧化物晶体粒子更小,晶相结构均匀,具有更大的比表面积,促进了Pd组分分散状态的提高,也丰富了催化剂的氧空位和结构缺陷,显著提高了催化剂的低温三效催化性能。利用MOFs前驱体热分解得到的复合氧化物可以作为三效催化贵金属活性组分分散的良好材料。

    Abstract:

    Recent research in three-way catalyst development for natural gas vehicles (NGVs) exhaust gas purification has been focusing on the high dispersibility of loaded noble metal of catalysts. In this paper, nanostructured CeCoOx composited oxide support was prepared by metal organic frameworks (MOFs) template method and compared with cerium-cobalt oxides prepared by the conventional sol-gel method (SG), which were used to investigate the dispersion state of noble metal Pd on the two catalyst supports and its influence on the catalytic performance. The results showed that the CO, NO and CH4 three-way catalytic performance of Pd/CeCoOx(M) catalyst derived from CeCo-MOFs material was about 100 ℃ lower than that of Pd/CeCoOx(SG) catalyst with the same composition prepared by sol-gel method, and it has lower low-temperature activity. The cerium-cobalt composite oxide derived from CeCo-MOFs had smaller crystal particles and uniform crystalline phase structure with larger specific surface area, which promoted the improvement of the dispersion state of Pd components and also enriched the oxygen vacancies and structural defects of the catalysts, so significantly improving the low-temperature three-way catalyst performance. The results indicated that the composite oxide obtained by thermal decomposition of MOFs precursor can be used as a good material for the dispersion of the active components of noble metal of three-way catalyst.

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李竺娟,杨佳豪,程成,阮乐,唐富顺,张哲. Pd/CeCoOx催化剂上Pd组分分散性改进及其NGVs尾气净化性能[J].稀有金属材料与工程,2023,52(10):3608~3616.[Li Zhujuan, Yang Jiahao, Cheng Cheng, Ruan Le, Tang Fushun, Zhang Zhe. Improvement of Pd dispersion and purification performance of NGVs exhaust on Pd/CeCoOx catalyst[J]. Rare Metal Materials and Engineering,2023,52(10):3608~3616.]
10.12442/j. issn.1002-185X.20220780

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历史
  • 收稿日期:2022-10-06
  • 最后修改日期:2023-09-12
  • 录用日期:2022-11-25
  • 在线发布日期: 2023-10-27
  • 出版日期: 2023-10-24