文献类型：期刊文献

中文题名：Ru/α-MnO_(2)催化剂形貌对NH_(3)-SCO反应性能的影响

英文题名：Effect of the morphology of Ru/α-MnO_(2)on NH_(3)-SCO performance

作者：李盼[1];马俊洋[1];陈志豪[1];王丽[1];郭耘[1]

机构：[1]华东理工大学化学与分子工程学院工业催化研究所,上海200237

年份：2023

卷号：74

期号：7

起止页码：2908

中文期刊名：化工学报

外文期刊名：CIESC Journal

收录：CSTPCD;;EI(收录号：20233814758132);Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2023_2024】；

基金：国家自然科学基金项目(21976057)。

语种：中文

中文关键词：催化剂;载体;氧化;氨选择性催化氧化;α-MnO_(2)形貌;酸性;氧化还原性

外文关键词：catalyst;support;oxidation;NH_(3)selective catalytic oxidation;morphologies ofα-MnO_(2);acidity;redox

摘要：以具有不同形貌的线状(w)、管状(t)和棒状(r)的α-MnO_(2)为载体制备了Ru/α-MnO_(2)催化剂,考察了载体形貌对于氨选择性催化氧化(NH3-SCO)反应性能的影响,并利用多种手段表征了催化剂的物化性质、氧化还原性能和酸性。α-MnO_(2)形貌影响所暴露的晶面;线状、纳米棒和管状α-MnO_(2)分别暴露(110)、(310)和(200)晶面。Ru的引入提高了催化剂的耐水性能,其中管状Ru/α-MnO_(2)在水汽条件下NH3转化率为86%,N2的选择性为98%。Ru的引入对反应性能的影响与其对α-MnO_(2)表面酸性、氧化还原性能的影响密切相关。Ru降低了α-MnO_(2)-w表面酸量导致其活性下降;Ru对于α-MnO_(2)-r氧化性能的提高弥补了其导致的表面酸量的降低;而Ru对α-MnO_(2)-t氧化性和酸量的同时促进是Ru/α-MnO_(2)-t反应性能提升的主要原因。
α-MnO_(2)with different morphology,such as wire(w),tube(t)and rod(r)were synthesized as supports to prepare Ru/α-MnO_(2),and the effects of support morphology on the ammonia selective catalytic oxidation(NH_(3)-SCO)were investigated.Meanwhile,the physical and chemical properties,redox properties and acidity of the catalysts were characterized by various methods.The exposed facet was closely related to the morphology ofα-MnO_(2),for(110),(310)and(200)crystal planes were observed on the wire-,tube-,and rod-α-MnO_(2),respectively.The introduction of Ru improves the water resistance of the catalyst,and the tubular Ru/α-MnO_(2)has a NH_(3)conversion rate of 86%and a N2 selectivity of 98%under water vapor conditions.The effects of Ru on NH_(3)-SCO activity performance was closely related to its effect on the surface acidity and redox property ofα-MnO_(2).The addition of Ru reduced the surface acid amount ofα-MnO_(2)-w and thus lowered its activity,while the improved reducibility of Ru toα-MnO_(2)-r compensated for the decreasing in the surface acid amount.However,for Ru/α-MnO_(2)-t,the simultaneous increase in reducibility and surface acid amount by the presence of Ru was the main reason for the enhancement in NH_(3)-SCO activity.