共沉淀法和浸渍法制备的HoCeMn/TiO_(2)催化剂的脱硝性能  

Denitration performance of HoCeMn/TiO_(2)catalysts prepared by co⁃precipitation and impregnation methods

作　　者：黄利华[1] 华坚 HUANG Lihua;HUA Jian(Insititute of Environment and Resources,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;National Engineering Research Center for Flue Gas Desulphurization,Chengdu 610064,China)

机构地区：[1]西南科技大学环境与资源学院,绵阳621010 [2]国家烟气脱硫工程技术中心,成都610065

出　　处：《无机化学学报》2024年第3期629-645,共17页Chinese Journal of Inorganic Chemistry

摘　　要：采用浸渍法和共沉淀法制备了HoCeMn/TiO_(2)脱硝催化剂并对其结构和性能进行了表征。结果表明共沉淀法增强了活性组分和载体的相互作用,从而增加了HoCeMnTi-C催化剂表面Ce^(3+)、Mn^(4+)以及吸附氧的含量,使其表现出优异的低温氧化还原性能。此外,共沉淀法制备的HoCeMnTi-C具有更多的表面酸性位点及更强的表面酸性。催化剂表面酸性和氧化还原性能的提高有助于氨的吸附和活化,从而显著提高其活性。表面酸性位点的增多还抑制了H_(2)O和SO_(2)在催化剂表面的吸附,提升了催化剂的抗水抗硫性能。催化剂上的选择性催化还原(SCR)反应遵循Eley-Rideal(E-R)机制,催化剂硫中毒是源于形成的硫酸盐覆盖或破坏了催化剂活性位。Impregnation and co-precipitation methods were used to synthesize HoCeMn/TiO_(2)catalysts for the reduc-tion of NO_(x) with NH3.Different kinds of characterization methods were used to explore the structures and perfor-mances of the catalysts.The results show that the co-precipitation method enhances the interactivity between the active component and carrier,thereby increasing the content of Ce^(3+),Mn^(4+),and adsorption oxygen on the surface of HoCeMnTi-C.As a result,it showed excellent low-temperature redox performance.In addition,HoCeMnTi-C pre-pared by the co-precipitation method possessed more surface acidic sites and stronger surface acidity.The improve-ment of surface acidity and redox performance is conducive to the adsorption and activation of ammonia,and there-by significantly improved its activity.The increase of acidic sites also restrained the adsorption of H_(2)O and SO_(2),and therefore sulfur and water resistance of HoCeMnTi-C were significantly promoted.The reaction of selective catalytic reduction(SCR)on catalysts obeys the Eley-Rideal(E-R)mechanism.SO_(2)poisoning of catalysts was caused by the formation of sulfates,which cover or damage the active sites of the catalysts.

关 键 词：HoCeMn/TiO_(2)催化剂 活性 抗水抗硫性能 

分 类 号：O643.36[理学—物理化学]