过渡金属离子对3NiM-Al混合金属氧化物丙烷氧化脱氢催化性能的影响  

The Effect of Transition Metal Ions on the Catalytic Performance of 3NiM-Al Mixed Metal Oxides for Oxidative Dehydrogenation of Propane

作　　者：高晓霞 王奖[1,2] 徐爱菊 贾美林[1,2] GAO Xiao-xia;WANG Jiang;XU Ai-ju;JIA Mei-lin(College of Chemistry and Environmental Science,Inner Mongolia Normal University,Hohhot 010022,China;Inner Mongolia Key Laboratory of Green Catalysis,Inner Mongolia Normal University,Hohhot 010022,China)

机构地区：[1]内蒙古师范大学化学与环境科学学院,内蒙古呼和浩特010022 [2]内蒙古自治区绿色催化重点实验室,内蒙古呼和浩特010022

出　　处：《内蒙古师范大学学报（自然科学汉文版）》2020年第6期546-551,共6页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：内蒙古自然科学基金资助项目(2019MS02016);内蒙古自治区高等学校科学研究资助项目(NJZY19024);内蒙古师范大学研究生科研创新基金资助项目(CXJJS18084)。

摘　　要：采用双滴法制备3Ni-Al类水滑石(LDH)和掺杂不同二价过渡金属离子的3NiM-Al(M=Mn、Co、Cu、Zn)LDH前驱体(物质的量比Ni2+/M2+=19∶1),600℃焙烧制得3Ni-Al和3NiM-Al混合金属氧化物(MMO)催化剂,对其进行X-射线衍射(XRD)、N2物理吸附-脱附、H2程序升温还原(H2-TPR)表征,考察掺杂不同二价过渡金属离子对其丙烷氧化脱氢(ODHP)制丙烯催化性能的影响。结果表明:掺杂M^2+对催化剂表面织构和氧化还原性的影响有所不同,表现出不同的ODHP催化性能。其中,少量Co^2+改性的3NiCo-Al MMO催化剂上ODHP催化活性最佳。在350℃~550℃测试范围内,初始丙烷转化率和丙烯选择性均明显优于其他催化剂,450℃时丙烷转化率为27%,丙烯选择性为43%。The precursors of 3Ni-Al layered double hydroxide(LDH)and 3NiM-Al LDH(M=Mn,Co,Cu,Zn)doped different divalent transition metal ions(Molar ratio Ni2+/M^2+=19∶1)were prepared by a simultaneous dropwise addition method.To investigate the effects of doping different divalent transition metal ions on their catalytic performance for oxidative dehydrogenation of propane(ODHP)to propylene,the 3Ni-Al and 3NiMAl mixed metal oxide(MMO)catalysts were obtained by calcination of the LDH precursors at 600℃and characterized by X-ray diffraction(XRD),N2 physical adsorption-desorption and H2 temperature programmed reduction(H2-TPR).The results showed that the effects of doping M^2+on the surface texture and redox properties of the catalysts were different and the catalytic performance of 3NiM-Al MMOs for ODHP were different.It was revealed that 3NiCo-Al MMO catalyst modified by a small amount Co^2+had the best catalytic performance,in detail,the initial propane conversion and propylene selectivity were better than other catalysts significantly in the testing range from 350℃to 550℃;the propane conversion was 27%and the propylene selectivity was 43%at 450℃.

关 键 词：类水滑石 混合金属氧化物 镍 二价过渡金属离子 丙烷氧化脱氢 

分 类 号：O643[理学—物理化学]