在YBa_2Cu_3O_(6～7)超导催化剂上CO_2加氢制醇的研究

Abstract

在ybA_2Cu_3O_(6~7)超导催化剂上进行CO_2加氢制醇的反应,研究了温度、压力和空速对催化剂活性和甲醇收率的影响.对催化剂进行了Xrd,原位fT-Ir,XPS,ESr和AfM表征,表明ybA_2Cu_3O_(6~7)在反应状态下被还原分解,铜主要被还原为Cu--+;CO_2加氢制醇的中间态可能为醛基、甲氧基;反应前催化剂粒度较大,反应后催化剂变得松散,粒度变小.

The hydrogenation of CQj over YBa^Cu^O^.j superconductor catalyst was investigated using XRD, in - situ FT- IR, XPS, ESR, TPR and ATM techniques.It is shown that the CH3OH selectivity is directly proportional to the reaction pressure and space velocity, but is inversely proportional to the reaction temperature.The Cu2+ ions in YBa2Cu3O6--7 were mainly reduced to Cu+ in the presence of H2 and CO2.The intermediates in the catalytic reaction might be aldehyde and methoxy radical.During the hydrogenation the catalyst might be decomposed.