锰氧化物负载硅藻土-埃洛石多孔陶瓷制备低温SCR脱硝催化剂  

Preparation of low temperature SCR denitration catalyst by MnO_(x)supported diatomite-halloysite porous ceramics

作　　者：李健[1] 石李明 吕双双 杨祥瑾 颜勋旭 张先龙 LI Jian;SHI Liming;LYU Shuangshuang;YANG Xiangjin;YAN Xunxu;ZHANG Xianlong(Sinopec,Anqing Branch,Anqing,246002,China;School of Environment and Life Health Anhui Vocational and Technical College,Hefei,230011,China;School of Chemistry and Chemical Engineering Hefei University of Technology,Hefei,230009,China;Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering,Hefei,230009,China)

机构地区：[1]中国石油化工股份有限公司安庆分公司,安庆246002 [2]安徽职业技术学院环境与生命健康学院,合肥230011 [3]合肥工业大学化学与化工学院,合肥230009 [4]先进催化材料与反应工程安徽省重点实验室,合肥230009

出　　处：《环境化学》2023年第10期3568-3578,共11页Environmental Chemistry

基　　金：国家自然科学基金(51002042);安徽省自然科学基金(2022AH052060);中央高校基本科研业务费专项基金(2011HGQLI003)资助.

摘　　要：分别采用原位生长法和浸渍法(IP)制备了Mn/DE-HAL催化剂,考察了不同制备方法对催化剂性能的影响,探究了原位生长法制备过程中MnO_(x)的负载机制.研究发现,在100—300℃之间,Mn(8)/DE-HAL(SP)表现出了更优异的催化活性.表征结果表明,Mn(8)/DE-HAL(SP)的活性组分仅分散在载体表面,而Mn(8)/DE-HAL(IP-300)的活性组分分布于载体表面与内部.这是因为原位生长法制备催化剂的过程中,载体表面的Mn(Ac)_(2)与KMnO_(4)反应被消耗完后,载体内部的Mn(Ac)_(2)也会迁移到表面与之反应,而浸渍法制备催化剂的过程中Mn(Ac)_(2)迁移较少.负载在载体表面的活性组分由于更容易与混合气体接触从而进行化学反应,在SCR反应中发挥着重要作用.原位生长法使MnO_(x)富集到载体表面,既提升了催化剂的催化活性,又提高了MnO_(x)的利用率.Mn/DE-HAL catalysts were prepared by in-situ growth method and impregnation method(IP),respectively.The effects of different preparation methods on the performance of the catalysts were investigated,and the loading mechanism of MnO_(x)in the preparation process of in-situ growth method was explored.It was found that Mn(8)/DE-HAL(SP)exhibited high SCR activity at temperature of 100—300℃.The characterization results showed that the active components of Mn(8)/DEHAL(SP)were only distributed on the surface of the support,while the active components of Mn(8)/DEHAL(IP-300)were distributed on the surface and inside of the support.This was due to the fact that during the process of preparing catalyst by in-situ growth method,when the Mn(Ac)_(2)on the surface of the carrier was consumed due to the reaction with KMnO_(4),the Mn(Ac)_(2)inside the carrier would also migrate to the surface to react with it;However,for the process of preparing catalysts by impregnation,Mn(Ac)_(2)inside the support could rarely migrate to the surface of the support.The active components loaded on the surface of the carrier played an important role in SCR reactions because they were easier to contact with mixed gases for chemical reactions.The in-situ growth method enriched MnO_(x)onto the surface of the carrier,which not only improved the catalytic activity of the catalyst,but also improved the utilization rate of MnO_(x).

关 键 词：MnO_(x) 原位生长 低温SCR脱硝 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]