HYDROGENATION OF CO_2 OVER A YBa_2Cu_3O_(6～7) CATALYST

研究了ＹＢａＣｕ３Ｏ６～７超导催化剂上ＣＯ２的加氢制醇反应。考察了温度、压力和空速等条件对催化剂反应性能的影响。反应的主要产物是甲醇、ＣＯ和少量甲醚。利用ＸＰＳ、ＸＲＤ和ＡＦＭ等技术对催化剂的结构、铜的存在状态和反应活性位进行表征发现，在反应过程中，ＹＢａ２Ｃｕ３Ｏ６～７由ｏｒｔｈｏｍｂｉｃ相转变为ｔｅｔｒａｇｏｎａｌ相。反应活性位可能是Ｃｕ（Ｉ）物种。反应后催化剂颗粒的分散程度明显提高

HYDROGENATION OF CO2 OVER A YBa2Cu3O6-7 CATALYST

Under different reaction conditions, hydrogenation of CO2 over a YBa2Cu3O6-7 superconductor catalyst was studied, and 1.72% yield of methanol was obtained at the optimum reaction conditions of 513 K, 3600 h-1 and 3.0 MPa. The main products were methanol, CO and trace of CH3OCH3. XPS, XRD and AFM techniques were used to characterize the structure, the copper oxidation states and the active sites. It was found that at in situ reaction condition, the structure of YBa2Cu3O6-7 transformed from orthorhombic to tetragonal phase.