CO氢化催化剂表面活性位的动态法研究

THE STUDY ON SURFACE SITE OF CATALYST FOR CO HYDROGENATION WITH THE TRANSIENT ANALYSIS

用程序升温表面反应(TPSR)和程序升温还原(TPR)以及过渡应答(TR)等动态手段研究Ni/Al_2O_3催化剂表面上CO氢化反应的活性位状况。结果表明,催化剂表面存在两种类型的活性位。其中A位来自表面上的聚晶体Ni,B位来自Ni与载体Al_2O_3强相互作用形成的Ni-Al化合物。实验结果还表明,CO在两个活性位都有吸附,但在有H_2参与的条件下,会影响二个活性位上的CO吸附量。

The state of surface site of catalyst for CO hydrogenation was studied with TPSR, TPR and TR. Results show that there are two kinds of active sites on the surface ofNi/Al_2O_3 catalysts. The site A comes from crystallite of Ni exposed on the surface,while the site B comes from Ni-Al intermediate which formed by the strong interac-tion of Ni with the support Al_2O_3. Results also show that the CO can be adsorbed onboth sites, if active hydrogen is adsorbed on the surface, the ratio of adsorbed COon both sites will be changed.