不同孔结构 CeTiOx 催化剂的制备和 NH3-SCR 催化性能

Q3 Energy

燃料化学学报 Pub Date : 2024-01-01 DOI:10.1016/S1872-5813(23)60369-X

Chenchen TAN, Yuxuan HAN, Yaqin HU, Kai SHEN, Shipeng DING, Yaping ZHANG

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引用次数: 0

摘要

为了研究孔结构对催化剂催化活性的影响，采用溶胶-凝胶法合成了四种催化剂，包括三维有序大孔-介孔（3DOM-m）CeTiOx、三维有序大孔（3DOM）CeTiOx、三维有序介孔（3DOm）CeTiOx和无序介孔（DM）CeTiOx。NH3-SCR脱硝测试结果表明，不同孔结构催化剂的性能依次为3DOM-m CeTiOx>3DOm CeTiOx>3DOM CeTiOx>DM CeTiOx，其中3DOM-m CeTiOx表现出优异的催化活性，在250-400 ℃范围内，GHSV为60000 h-1时，NO转化率超过90%。通过 XRD、SEM、BET、NH3-TPD 和原位 DRIFTS 对催化剂进行的表征表明，表面积并不是决定 CeTiOx 催化活性的主要因素。3DOM-m CeTiOx 具有高度有序的大孔-多孔结构和丰富的布氏酸性位点，从而提高了脱硝活性。在 3DOM-m CeTiOx 上进行的 NH3-SCR 反应主要遵循 L-H 和 E-R 机制。

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Preparation and NH3-SCR catalytic performance of CeTiOx catalysts with different pore structures

To investigate the influence of pore structure on the catalytic activity of catalysts, four catalysts including three-dimensionally ordered macroporous-mesoporous (3DOM-m) CeTiO_x, three-dimensionally ordered macroporous (3DOM) CeTiO_x, three-dimensionally ordered mesoporous (3DOm) CeTiO_x and disordered mesoporous (DM) CeTiO_x were synthesized by the sol-gel method. The NH₃-SCR denitration testing results show that the performance of the catalysts with different pore structures follows the sequence of 3DOM-m CeTiO_x>3DOm CeTiO_x>3DOM CeTiO_x>DM CeTiO_x, and the 3DOM-m CeTiO_x shows an excellent catalytic activity, with more than 90% NO conversion in the range of 250–400 °C at a GHSV of 60000 h⁻¹. The characterization of catalysts by XRD, SEM, BET, NH₃-TPD and in-situ DRIFTS indicates that the surface area is not the dominant factor determining the catalytic activity of CeTiO_x. 3DOM-m CeTiO_x has a highly ordered macroporous-mesoporous structure and abundant Bronsted acidic sites, thereby improving the denitrification activity. The NH₃-SCR reaction over the 3DOM-m CeTiO_x mainly follows the L-H and E-R mechanisms.

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.