摘要
系统地将工业化甲醇催化剂应用于CO2加氢制备甲醇反应中,考察5种工业化甲醇催化剂在CO2加氢反应中的反应活性,运用ICP、N2-物理吸附、XRD和H2-TPR等手段对催化剂进行表征。结果表明,Cu/Zn/Al催化剂具有较高的CO2加氢反应活性,在温度220℃和压力3 MPa条件下,CO2转化率为22.9%,甲醇选择性为64.8%。催化剂活性与组分含量、晶粒大小、比表面积和孔结构等因素有关,CuO和ZnO组分含量越高,催化活性越好,适度晶粒大小的CuO物种可能是该反应中有效催化活性位前驱体,反应规律与甲酸铜中间体理论基本吻合;高比表面积和规整孔结构均有助于提高催化活性。
The catalysts used in commercial methanol synthesis were studied systematically for the hydro- genation of CO2 to methanol for the first time and their performance was investigated in a fixed-bed reactor. The catalysts were characterized by means of XRD, N2 adsorption-desorption, H2-TPR and ICP. The results indicated that Cu/Zn/A1 catalysts exhibited higher activity for CO2 hydrogenation, and CO2 conversion and selectivity to methanol were 22.9% and 64. 8% respectively under the condition of reaction temperature 220 ~C and reaction pressure 3.0 MPa. The activities of the catalysts were mainly related to their component contents, grain sizes, surface areas and pore structures. The higher the contents of CuO/ZnO were ,the higher the catalytic activity was. CuO species with appropriate grain sizes might be the effective precursor with catalytic activity, and their reaction rule was consistent with the theory of the HCOO-Cu intermediates. Furthermore,the higher surface area and neat pore structures could improve the activity of the catalyst.
出处
《工业催化》
CAS
2012年第2期47-53,共7页
Industrial Catalysis
基金
上海市科委基金(10dz1205000)资助项目
关键词
能源化学
甲醇催化剂
CO2加氢
合成气
工业化
energy chemistry
methanol catalyst
carbon dioxide hydrogenation
syngas
industrialization
