在CO2年排放量持续上升的背景下,CO2捕集与利用技术的发展迫在眉睫。这项研究的重点是提高催化剂对CO2加氢的催化能力,提高CO2转化为甲醇的效率,并将H2转化为化学物质,以避免H2储存的危险。基于元素共享的概念,利用Al元素的两性金属性质,通过将CuO-ZnO-Al2O3催化剂与ZSM-5沸石组合制备ASMZ(铝份额金属沸石催化剂)系列催化剂。通过XRD比较了ASMZ催化剂的基本结构性能,FTIR,和BET表征。在微型固定床反应器上测量了样品的催化性能。用SEM进一步分析了催化剂的催化机理,TEM,XPS,H2-TPR,和NH3-TPD.结果表明,ASMZ3催化剂的CO2转化率最高(26.4%),最高的甲醇选择性(76.0%),在这项研究中,CO选择性最低(15.3%)。这主要是由于本研究中的制备方法促进了有效弱酸性位点和中等强度酸性位点的暴露(促进了CO2向甲醇的加氢)。同时,Cu-ZnO-Al2O3(CZA)与ZSM-5沸石的紧密结合也保证了催化产物的及时转移,保证了各种催化活性中心的及时发挥。本研讨中催化剂的制备办法也为其他催化剂的制备供给了思绪。
Under the background of the continuous rise of CO2 annual emissions, the development of CO2 capture and utilization technology is urgent. This study focuses on improving the catalytic capacity of the catalyst for CO2
hydrogenation, improving the efficiency of CO2 conversion to methanol, and converting H2 into chemical substances to avoid the danger of H2 storage. Based on the concept of element sharing, the ASMZ (Aluminum Shares Metal Zeolite catalysts) series catalyst was prepared by combining the CuO-ZnO-Al2O3 catalyst with the ZSM-5 zeolite using the amphoteric metal properties of the Al element. The basic structural properties of ASMZ catalysts were compared by XRD, FTIR, and BET characterization. Catalytic properties of samples were measured on a micro fixed-bed reactor. The catalytic mechanism of the catalyst was further analyzed by SEM, TEM, XPS, H2-TPR, and NH3-TPD. The results show that the ASMZ3 catalyst had the highest CO2 conversion rate (26.4%), the highest methanol selectivity (76.0%), and the lowest CO selectivity (15.3%) in this study. This is mainly due to the fact that the preparation method in this study promotes the exposure of effective weakly acidic sites and medium strength acidic sites (facilitating the
hydrogenation of CO2 to methanol). At the same time, the close binding of Cu-ZnO-Al2O3 (CZA) and ZSM-5 zeolite also ensures the timely transfer of catalytic products and ensures the timely play of various catalytic active centers. The preparation method of the catalyst in this study also provides ideas for the preparation of other catalysts.