分层状多孔SiO2负载Ni基催化剂用于甲烷二氧化碳重整反应的研究  

Hierarchical layered porous SiO2 supported Ni-based catalyst for methane reforming reaction

作　　者：孟昭俊 王自军 MENG Zhao-jun;WANG Zi-jun(Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan,Shihezi University School of Chemistry and Chemical Engineering,Shihezi University,Shihezi 832003,China)

机构地区：[1]石河子大学化学化工学院,新疆兵团化工绿色过程重点实验室-省部共建国家重点实验室培育基地,新疆石河子832003

出　　处：《现代化工》2020年第4期104-109,共6页Modern Chemical Industry

基　　金：国家自然科学基金(21766029,21566031)。

摘　　要：以"膨胀-酸化"改性处理蛭石(VTM)制备的二维层状多孔纳米片(EXVTM-SiO2)为载体,采用浸渍法制备负载量不同的Ni/EXVTM-SiO2催化剂用于甲烷重整反应。通过BET、XRD、XRF、SEM、H2-TPR、TEM、TG等对催化剂进行表征,在常压750℃条件下进行300 min稳定性实验。结果表明,10%Ni/EXVTM-SiO2表现出较好的催化活性及稳定性,其CO2、CH4的初始转化率分别为92%、55%。这主要是由于10%Ni/EXVTM-SiO2催化剂具有大的比表面积、较好的金属分散性,从而使催化剂具有一定的抗积碳和抗烧结性。Vermiculite( VTM) is modified by"expansion-acidification"to prepare two-dimensional layered porous nanosheets( EXVTM-SiO2),which are used as support to prepare Ni/EXVTM-SiO2 catalysts with different loading amounts for methane reforming reaction by means of impregnation method.The catalysts are characterized by BET,XRD,XRF,SEM,H2-TPR,TEM and TG techniques,and the stability experiment for the catalysts has been carried out under atmospheric pressure at 750℃ for 300 min.Experimental results show that 10% Ni/VTM-SiO2 exhibits a better catalytic activity and stability,over which the initial conversion rates of CO2 and CH4 are 92% and 55%,respectively. The main reason is that 10%Ni/EXVTM-SiO2 catalyst has a larger specific surface area and better metal dispersion,so that it has a certain degree of carbon deposition and sintering resistance.

关 键 词：膨胀-酸化 甲烷重整 蛭石 层状多孔SiO2 镍基催化剂 

分 类 号：TQ426[化学工程]