预热分解系统中CuCe-MCM-41催化剂多气体去除性能研究

doi:10.16552/j.cnki.issn1001-1625.2024.1497

摘要/Abstract

摘要： 针对水泥窑协同处置废物烟气中氮氧化物(NO_x)和可挥发性有机物(VOCs)需要处理的工程需求,本研究采用浸渍法制备了一系列不同Cu/Ce掺杂比例的CuCe-MCM-41负载型催化剂,探讨了其在水泥窑预热分解系统场景下催化脱除甲苯和NO_x的性能及其性能优异的原因。结果表明:在450~600 ℃下,Cu₂Ce₁-MCM-41催化剂的甲苯转化率在90%以上,在900~1 000 ℃,NO_x的转化率接近60%,说明Cu₂Ce₁-MCM-41催化剂在催化氧化甲苯后,仍具有一定的脱硝活性;Cu²⁺和Ce³⁺引入显著增加了MCM-41分子筛表面的酸度和活性位点数量,氧化还原循环促进了氧空位的形成,因此,负载Cu/Ce的MCM-41催化剂表现出优异的催化氧化甲苯及脱硝活性,有望结合水泥工艺去除烟气VOCs,大幅降低进入NH₃-SCR烟气的NO_x浓度,延长催化剂使用寿命,降低NO_x治理成本。

关键词: 负载型催化剂, MCM-41, 催化氧化, NO_x去除, 水泥窑, 分解炉

Abstract: In view of the engineering requirements for the co-processing of nitrogen oxides (NO_x) and volatile organic compounds (VOCs) in the flue gas of waste in cement kiln, a series of CuCe-MCM-41 loading catalysts with different Cu/Ce doping ratios were prepared by impregnation method. The performance of catalytic removal of toluene and NO_x in the pre-calcining system of cement kiln and the reasons for its excellent performance were discussed. The results show that the prepared Cu₂Ce₁-MCM-41 catalyst has a toluene conversion rate of more than 90% at 450~600 ℃, and the NO_x conversion rate is close to 60% at 800~1 000 ℃. It shows that the Cu₂Ce₁-MCM-41 catalyst still has a certain denitration activity after catalytic oxidation of toluene. The introduction of Cu²⁺ and Ce³⁺ significantly increases the acidity and the number of active sites on the surface of MCM-41 molecular sieve, and the oxidation reduction cycle promotes the formation of oxygen vacancies. Therefore, the Cu/Ce coading MCM-41 catalyst shows excellent catalytic oxidation of toluene and denitration activity. It is expected to combine the cement process to remove VOCs from flue gas, greatly reduce the NO_x concentration entering the NH₃-SCR flue gas, prolong the service life of catalyst, and reduce NO_x abatement costs.

Key words: supported catalyst, MCM-41, catalytic oxidation, NO_x removal, cement kiln, precalciner

中图分类号:

X511

张新宇, 崔素萍, 孟令钦, 王亚丽. 预热分解系统中CuCe-MCM-41催化剂多气体去除性能研究[J]. 硅酸盐通报, 2025, 44(6): 2005-2015.

ZHANG Xinyu, CUI Suping, MENG Lingqin, WANG Yali. Multi-Gas Removal Performance of CuCe-MCM-41 Catalyst in Preheating Decomposition System[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2005-2015.

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