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Pd/CeCoOx催化劑上Pd組分分散性改進(jìn)及其NGVs尾氣凈化性能
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桂林理工大學(xué)化學(xué)與生物工程學(xué)院

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中圖分類號:

TK09

基金項目:

廣西創(chuàng)新驅(qū)動發(fā)展專項(科技重大專項)(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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廣西創(chuàng)新驅(qū)動發(fā)展專項(科技重大專項)(桂科AA18118010)

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    摘要:

    近年來,天然氣汽車(NGVs)尾氣凈化三效催化劑的研究主要集中在具有高分散性的負(fù)載型貴金屬催化劑。本文利用金屬有機骨架(MOFs)模板法制備了納米結(jié)構(gòu)的CeCoOx復(fù)合氧化物作為載體,并與傳統(tǒng)溶膠-凝膠法(SG)制備的鈰鈷氧化物比較,探究了貴金屬Pd在兩種催化劑載體上的分散狀態(tài)及其對催化性能的影響。結(jié)果表明,以CeCo-MOFs材料為前驅(qū)體衍生制備的Pd/CeCoOx(M)催化劑其CO、NO、CH4三效催化性能相比溶膠-凝膠法制備的相同組成Pd/CeCoOx(SG)催化劑低了約100 ℃左右,具有更低的低溫活性。以CeCo-MOFs為前驅(qū)體衍生制備的鈰鈷復(fù)合氧化物晶體粒子更小,晶相結(jié)構(gòu)均勻,具有更大的比表面積,促進(jìn)了Pd組分分散狀態(tài)的提高,也豐富了催化劑的氧空位和結(jié)構(gòu)缺陷,顯著提高了催化劑的低溫三效催化性能。利用MOFs前驅(qū)體熱分解得到的復(fù)合氧化物可以作為三效催化貴金屬活性組分分散的良好材料。

    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,楊佳豪,程成,阮樂,唐富順,張哲. Pd/CeCoOx催化劑上Pd組分分散性改進(jìn)及其NGVs尾氣凈化性能[J].稀有金屬材料與工程,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.]
DOI:10.12442/j. issn.1002-185X.20220780

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  • 收稿日期:2022-10-06
  • 最后修改日期:2023-09-12
  • 錄用日期:2022-11-25
  • 在線發(fā)布日期: 2023-10-27
  • 出版日期: 2023-10-24