【摘要】 通过TPD、TPSR、PSR等手段 ,对NBC -1型铁系无铬CO高温变换催化剂进行了变换反应机理的研究。实验证明 ,H2 O在催化剂活性表面上是化学吸附 ,在表面反应产生H2 的同时也产生了覆盖活性表面的“惰性产物”———表面O·(σ) ,使催化剂的活性表面发生“钝化” ;CO在反应温度下未吸附在催化剂表面而是存在于气相 ,同催化剂表面的表面O·(σ)作用生成CO2 ·(σ) ,CO2 脱附后又使活性表面“更新”。在整个变换反应过程中 ,催化剂实际没有参与反应 ,只是提供能够进行反应的“活性中心”。变换反应过程实际上是一个催化剂表面反复“钝化”和反复“更新”的过程。更多还原

【Abstract】 The reaction mechanism of NBC-1 non_chromium iron based catalyst is studied through TPD,TPSR and PSR. It is proved that the adsorption of H 2O is chemical on the surface of the catalyst. While H 2 is produced the inertial product O·(σ)that will cover the active surface is also produced. It will make the surface of the catalyst inactive; CO is only in gas phase over the surface of the catalyst but not be adsorbed at the reaction temperature ,and reacts with O·(σ) to produce CO 2·(σ). It makes the surface of the catalyst renewed when CO 2·(σ) de_adsorbes from the surface. The catalyst doesn’t participate the reactions in fact, it only provides “the active points" on the surface. The shift reaction is actually such a process that the surface of the catalyst is repeatedly inactivated and renewed alternatively.更多还原