摘要
采用溶胶-凝胶法(sol-gel)制备了一系列具有不同RuO_2含量的RuO_2-Fe_2O_3催化剂,并将其应用于氨选择性催化氧化(NH3-SCO)研究中。结果表明,所有RuO_2-Fe_2O_3催化剂都表现出较好的低温活性,且RuO_2含量对催化剂的NH3催化氧化活性影响显著。此外,利用BET、XRD、H2-TPR和DRIFTS等表征手段研究了催化剂的物理化学性质和催化活性之间的关系。结果表明,RuO_2的加入增大了催化剂的比表面积。RuO_2与Fe_2O_3之间存在的协同效应提高了催化剂的氧化还原能力,从而提高了催化剂的氨氧化活性。同时,RuO_2含量对催化剂表面酸性影响很大,且催化剂表面主要存在Lewis酸性位点。
A series of RuO2-Fe2O3 catalysts varied in RuO2 loading were prepared by sol-gel method and used for selective catalytic oxidation of ammonia to nitrogen.The results indicated that all the RuO2-Fe2O3 catalysts showed an excellent low-temperature catalytic activity and the RuO2 loading played a key role in catalytic activity of ammonia oxidation.Moreover,the characterizations of BET,XRD,H2-TPR and DRIFTS were employed to investigate the relation between the physicochemical property of catalysts and catalytic activity.The research results elucidated that the introduction of RuO2 increased the surface area.The synergistic effect between RuO2 and Fe2O3 enhanced the redox property and the catalytic activity of ammonia oxidation.Meanwhile,the RuO2 loading gave the significant effect on surface acidity of catalysts.Lewis acid sites were predominant on the catalyst surface.
作者
王慧敏
宁平
张秋林
刘昕
张腾祥
胡嘉
王兰英
WANG Hui-min;NING Ping;ZHANG Qiu-lin;LIU Xin;ZHANG Teng-xiang;HU Jia;WANG Lan-ying(Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China)
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2019年第2期215-223,共9页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(21307047)资助~~
关键词
溶胶-凝胶法
氨选择性催化氧化
协同效应
酸性位点
sol-gel method
selective catalytic oxidation of ammonia
synergistic effect
acid sites
