Tian Jing, Qian Weixin, Zhang Haitao, Ma Hongfang, Ying Weiyong
Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology Shanghai 200237 China
RSC Adv. 2023 May 9;13(20):13902-13910. doi: 10.1039/d3ra01188g. eCollection 2023 May 2.
In this paper, catalysts with different aluminum contents were prepared by a co-precipitation method using LDHs (layered double hydroxides) as the precursors through the adjustment of Cu : Fe, and the catalysts were named LDO catalysts. The effect of aluminum on CO hydrogenation to methanol was investigated by evaluating the characterization. With the addition of Al, Ar physisorption results showed an increase in BET-specific surface area, TEM demonstrated a decrease in catalyst particle diameter, XRD showed that Cu and Fe existed in the catalyst mainly in the form of CuFeO and CuO, XPS demonstrated a decrease in electron cloud density and an increase in base sites and oxygen vacancies, and CO-TPD and H-TPD results indicated that Al promoted the dissociation and adsorption of CO and H. When the reaction temperature was 230 °C, the pressure was 4 MPa, H/CO = 2.5 and the space velocity was 2000 ml (h g), the best conversion (14.87%) and the highest methanol selectivity (39.53%) of the catalyst were obtained at 30% aluminum content.
本文采用共沉淀法，以层状双氢氧化物（LDHs）为前驱体，通过调整铜铁比例制备了不同铝含量的催化剂，并将其命名为LDO催化剂。通过表征评估了铝对CO加氢制甲醇的影响。添加铝后，氩气物理吸附结果表明BET比表面积增加，透射电子显微镜（TEM）显示催化剂粒径减小，X射线衍射（XRD）表明催化剂中铜和铁主要以CuFeO和CuO的形式存在，X射线光电子能谱（XPS）表明电子云密度降低，碱性位点和氧空位增加，CO程序升温脱附（CO-TPD）和H程序升温脱附（H-TPD）结果表明铝促进了CO和H的解离与吸附。当反应温度为230℃、压力为4MPa、H/CO = 2.5且空速为2000ml/(h g)时，铝含量为30%的催化剂获得了最佳转化率（14.87%）和最高甲醇选择性（39.53%）。
