制备方法对铁钛催化剂物化性能及脱硝活性的影响  

Effect of Preparation Method on Physicochemical Properties and Denitration Activity of Iron Titanium Catalyst

作　　者：邱学武 李泽宇 蔡思翔[1,2,3] 姜宏[1,2,3] QIU Xuewu;LI Zeyu;CAI Sixiang;JIANG Hong(State Key Laboratory of Marine Resources Utilization of the South China Sea,Hainan University Shanghai,Haikou 570228,China;Hainan Special Glass Laboratory of Hainan University,Haikou 570228,China;School of Materials Science and Engineering,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学,南海海洋资源利用国家重点实验室,海口570228 [2]海南大学,海南省特种玻璃实验室,海口570228 [3]海南大学材料科学与工程学院,海口570228

出　　处：《人工晶体学报》2020年第9期1684-1690,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51761010);海南大学科研平台建设(ZY2019HN09);海南省重点研发计划(ZDYF2019019)。

摘　　要：采用氨水共沉淀方法合成Fe 3+/Fe 2+摩尔比为1∶1及掺一定量Ti 4+的铁钛固溶体催化剂,与机械混合研磨方法制备的铁钛催化剂相比较。探讨不同制备工艺对催化剂物化性能及催化活性的影响。借助X射线衍射(XRD)、N 2吸脱附、X射线光电子能谱(XPS)、程序升温还原(H 2-TPR)、程序升温脱附(NH 3-TPD)等手段对催化剂物理化学性质进行表征。结果表明:通过一步氨水共沉淀法及掺杂一定量Ti有利于提高催化剂的比表面积,抑制氧化物结晶及晶相转变,使得催化剂晶粒尺寸较小,提高低温催化活性;同时说明经过机械混合研磨制备的催化剂,只是氧化物晶体之间简单的机械混合,没有形成紧密的耦合作用,不能有效改善催化性能。The iron-titanium solid solution catalyst with Fe 3+/Fe 2+molar ratio of 1∶1 and a certain amount of Ti 4+were synthesized by ammonia co-precipitation method.It was compared with the iron titanium catalyst prepared by mechanical mixing grinding method.The effects of different preparation processes on the physicochemical properties and catalytic activity of catalyst were discussed.The physical and chemical properties of the catalyst were characterized by means of XRD,N 2 adsorption-desorption,XPS,H 2-TPR and NH 3-TPD.The results show that the one-step ammonia co-precipitation method and the doping a certain amount of Ti are beneficial to increase the specific surface area of the catalyst,suppress oxide crystallization and crystal phase transformation,make the catalyst grain size smaller,and improve the low-temperature catalytic activity.At the same time,it shows that the catalyst prepared by mechanical mixing grinding is only a simple mechanical mixing between oxide crystals,which does not form a close coupling effect and can not effectively improve the catalytic performance.

关 键 词：铁钛催化剂 氨水共沉淀法 机械混合研磨方法 低温催化活性 还原性能 表面吸附氧 

分 类 号：O643.36[理学—物理化学]