工业应用场景对贵金属催化燃烧催化剂性能的影响  

Influence of application scenarios on the performance of noble metal catalysts for catalytic combustion

作　　者：皇甫晨阳 姚露露 马莹莹 郭珊珊 王镇涛 吴淑澄 金科 蒋星宇 赵伟荣[1] HUANGFU Chenyang;YAO Lulu;MA Yingying;GUO Shanshan;WANG Zhentao;WU Shucheng;JIN Ke;JIANG Xingyu;ZHAO Weirong(College of Environmental and Resource Sciences,Zhejiang University,Hangzhou Zhejiang 310058;Jiangsu Angel Exhaust Gas Purification Co.Ltd.,Wuxi Jiangsu 214200)

机构地区：[1]浙江大学环境与资源学院,浙江杭州310058 [2]江苏安琪尔废气净化有限公司,江苏无锡214200

出　　处：《环境污染与防治》2023年第8期1047-1054,共8页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.51778564);浙江省“尖兵”“领雁”研发攻关计划项目(No.2022C03045)。

摘　　要：应用场景是影响催化剂使用寿命的重要因素,依托实际工程,对用于履带制造、高分子材料生产、合成革制造废气治理的同批次Pt-Pd/γ-Al_(2)O_(3)整体式催化剂进行取样(分别记作S_(1)、S_(2)、S_(3)),在实验室评价系统中表征样品的催化性能并分析失活原因。结果表明,S_(1)、S_(2)、S_(3)的催化活性均有所下降,S_(3)上乙酸丁酯和丁酮的最大转化率不足80%,且产生大量乙酸等异味中间产物。电感耦合等离子体发射光谱仪(ICP-OES)、扫描电镜(SEM)等表征结果显示,S_(2)、S_(3)的失活与载体烧结、贵金属流失和团聚及催化剂供氧能力变差有关;S_(1)的失活可归因于催化三氯乙烯引起的积碳,可通过高温空气煅烧得到再生;S_(1)、S_(2)、S_(3)的PdO含量均降低,表明催化剂的失活与氧化还原能力变弱有关。研究结果可为贵金属催化剂的开发和在类似挥发性有机化合物(VOCs)治理行业中的高效应用提供参考。The service life of catalyst is affected by application scenarios.Relying on practical engineering applications,same batch of Pt-Pd/γ-Al_(2)O_(3)monolithic catalysts used for VOCs catalytic combustion in rubber track,polymer material and synthetic leather manufacturing(denoted as S_(1),S_(2)and S_(3),respectively)were retrieved and the performance and deactivation reasons of the catalysts were comparatively investigated in the laboratory evaluation system.The results showed that the catalytic activity of S_(1),S_(2)and S_(3)decreased,and the maximum removal rates of butyl acetate and butyl ketone of S_(3)were less than 80%,accompanied by a large amount of odorous intermediates such as acetic acid.The characterization results from ICP-OES,SEM,and so on confirmed that the carrier sintering,loss and agglomeration of noble metals and poor oxygen supply performance were responsible for the declined activity of S_(2)and S_(3).The deactivation of S_(1)might be attributed to carbon deposition caused by trichloro ethylene and could be regenerated by oxidation.The content of PdO species on S_(1),S_(2)and S_(3)decreased,indicating that the deactivation of catalysts was related to the lower redox ability.This work paves the way for the development and efficient application of noble metal catalysts in different application scenarios.

关 键 词：挥发性有机化合物 催化剂失活 烧结 积碳 供氧性能 

分 类 号：X701[环境科学与工程—环境工程]