摘要
本文考察了在连续进样条件下,正己烷在铂镓双组分催化剂上的反应行为。在Pt/Al_2O_3催化剂中引入Ga能够提高铂催化剂的稳定性。当催化剂中含Ga量低于3.5％时,Ga的引入抑制了Pt/Al_2O_3催化剂的反应活性,当Ga含量高于3.5％时,则能够促进正己烷的反应。调节催化剂的含Ga量,能够使铂催化剂分别呈现较好的芳构化、异构化或加氢裂解反应的选择性。此外,采用TPR和氢的化学吸附技术表征了Pt-Ga/Al_2O_3的还原特性和吸氢性能,初步探讨了Ga在催化剂中的作用机理。
The performance of Pt-Ga/Al2O3 in the conversion of n-hexane in the presence of H2 was investigated in a continuous flow microreactor. TPR and H2 che-misorplion ere used to characterize the reduction and chemisorption properties of the catalyst. Experimental results showed that the addition of Ga into Pt/Al2O3 improved the stability. The catalysts with Ga belov 3.5% suppressed the conversion of n-hexane, while the catalysts with Ga more than 3.5% promoted the reaction. The selectivity for aromatization, isomerization and hydrocracking could be adjusted by changing the content of Ga of the catalyst. The role of Ga was briefly discussed in terms of the effect of Ga on reduction and H2 adsorption of Pt catalyst.
