Zr(OH)4的晶化对Pt/WO3-ZrO2异构化反应性能的影响

采用浸渍法制备了Pt/WO3-ZrO2催化剂，考察了Zr(OH)4的晶化对Pt/WO3-ZrO2催化剂上正己烷异构化性能的影响。结果表明，Zr(OH)4母体的晶化对Pt/WO3-ZrO2的酸性和正己烷异构化性能的影响依赖于负载W后样品的焙烧温度。Zr(OH)4的晶化导致了Zrθ1-W700（θ1为Zr(OH)4母体在空气中的晶化温度，700为负载W后的焙烧温度）上酸中心和Pt/Zrθ1-W700的异构化活性的明显下降，而Zrθ1-W800上的酸中心和Pt/Zrθ1-W700的异构化活性无明显变化。正己烷异构化活性不但与WO3-ZrO2上的其酸性有关，且与其中大量四方相ZrO2的存在密切相关。

EFFECTS OF CRYSTALLIZATION OF ZIRCONIUM HYDROXIDE ON THE ISOMERIZATION PERFORMANCES OF Pt/WO3-ZrO2

Pt/WO3-ZrO2 catalysts were prepared by impregnating method. The effect of Zr(OH)4 crystallization on the isomerization performance of Pt/WO3-ZrO2 was investigated. The results showed that the effects of the crystallization of Zr(OH)4 on the acidity of WO3-ZrO2 and the isomerization activity of Pt/WO3-ZrO2 was dependent on the calcination temperature of Zr(OH)4 loaded with W. The crystallization of Zr(OH)4 led to a significant decrease in the acid sites on Zrθ1-W700 and the isomerization activity of Pt/Zrθ1-W700 (θ1 and 700 represented the crystallization temperature of Zr(OH)4. However, the crystallization could not result in the great change in the acid sites on Zrθ1-W800 and the isomerization activity of Pt/Zrθ1-W800. The isomerization activity of the catalyst of Pt/WO3-ZrO2 was related not only to the acidity of WO3-ZrO2, but to the amount of tetragonal zirconia in Pt/WO3-ZrO2.