锆钇柱撑蒙脱土负载Pd催化剂的催化性能研究(英文)

Catalytic Performance of Pd Catalyst Supported on Zirconium and Yttrium Pillared Montmorillonite

合成了锆钇柱撑蒙脱土(Zr-Y-MMT)载体,并用于丙酮、甲苯和乙酸乙酯的催化氧化。通过XRD、TEM及N2吸附-脱附技术对Zr-Y-MMT载体和负载Pd催化剂(Pd/Zr-Y-MMT)进行了表征。XRD结果显示,经锆钇柱撑后蒙脱土的层间距由1.27nm增大至1.78nm;N2吸脱附结果表明,经锆钇柱撑后,其比表面积有了很大的增加,由62m2·g^-1增大至395m2·g^-1。活性评价结果发现,Zr-Y-MMT载体比Na-MMT有更好的催化活性,其完全氧化丙酮、甲苯和乙酸乙酯的温度分别为320℃、350℃和290℃。此外,当此载体上负载0.1wt%Pd时,其用于完全氧化甲苯的活性有了明显的改进。

A montmorillonite support material pillared with zirconium and yttrium （Zr-Y-MMT） was prepared for catalytic oxidation of acetone, toluene and ethyl acetate. The Zr-Y-MMT support and the supported Pd catalyst （Pd/Zr-Y-MMT） were characterized by XRD, TEM and low temperature nitrogen adsorption-desorption techniques. The XRD results indicate that the interlayer spacing of the montmorillonite is increased from 1.27 nm to 1.78 nm after zirconium and yttrium cation pillaring. N2 adsorption-desorption results show that a great increase in BET specific surface area （from 62 to 395 m^2·g^-1） is found for Na-MMT pillared with zirconium and yttrium. It is also found that Zr-Y-MMT is more active than Na-MMT for the complete oxidation of acetone, toluene and ethyl acetate, and the temperature for the said catalytic oxidation can be lowered to 320 ℃, 350 ℃ and 290 ℃, respectively. Moreover, after 0.1wt% Pd was supported on Zr-Y-MMT, the catalytic activity was obviously improved for toluene combustion.