Abstract:

Pt-SO₄ ^2-/ZrO₂-Al₂O₃（PSZA） catalyst was prepared by impregnation method. The effects of binder pseudoboehmite sources on the isomerization activity and mechanical strength of PSZA were investigated, and the suitable source of binder was determined. Also，the preparation of the zirconium hydroxide was scaled up about 10 times from 25g to 250g and the isomerization performance of simplified shaped PSZA was explored. Based on this, the influence of Al₂O₃ binder content was investigated. The catalysts were characterized by XRD, TG, XRF, and so on. The experimental results demonstrated that pseudoboehmite from different sources had different crystallinity, which led to PSZA with different isomerization activity and mechanical strength. The high crystallinity of the pseudoboehmite provided the catalyst with low sulfur content, high isomerization activity and high mechanical strength. In addition, the catalyst prepared with large scale did not show significant change in the isomerization performance of the catalyst. The binder content in the studied range had no significant effect on the initial isomerization activity of the catalyst, but the reaction stability decreased greatly with the increase of the binder content. When the isomerization activity and mechanical strength of the catalyst were both desirable, a suitable alumina content was 5%～10%.

Key words: PSZA, catalyst, alumina, hydrogenation, mechanical strength

摘要：

采用浸渍法制备了Pt-SO₄ ^2-/ZrO₂-Al₂O₃（PSZA）催化剂，考察了黏结剂拟薄水铝石的来源对PSZA异构化活性和机械强度的影响，确定了较为适合的黏结剂来源。对氢氧化锆母体制备进行从25g放大10倍至250g，研究放大催化剂的异构化性能。在此基础上考察了Al₂O₃黏结剂含量对PSZA异构化活性和机械强度的影响。采用XRD、TG、XRF等手段对催化剂进行了表征，结果表明：拟薄水铝石的来源不同，结晶度不同，制备的催化剂的异构化活性与机械强度均有差别，拟薄水铝石的结晶度越高，制备的催化剂上的硫含量越低，异构化活性越高，机械强度也越高。此外，放大10倍制备的催化剂异构化性能没有明显变化。黏结剂含量对催化剂的初始异构化活性没有明显影响，而反应稳定性随着黏结剂含量的提高大幅度降低。兼顾催化剂的异构化活性与机械强度，较适宜的Al₂O₃质量分数为5%～10%。

关键词: Pt-SO₄ ^2-/ZrO₂-Al₂O₃, 催化剂, 氧化铝, 加氢, 机械强度