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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。
This article examines the reaction conditions of n-hexane on a platinum-gallium two-component catalyst under continuous injection conditions. The introduction of Ga into the Pt / Al 2 O 3 catalyst can improve the stability of the platinum catalyst. The introduction of Ga suppresses the reactivity of the Pt / Al 2 O 3 catalyst when the content of Ga in the catalyst is less than 3.5%. When the content of Ga is higher than 3.5%, the reaction of n-hexane can be promoted. Adjusting the Ga content of the catalyst enables the platinum catalyst to exhibit better selectivity for aromatization, isomerization or hydrocracking reactions, respectively. In addition, TPR and hydrogen chemisorption techniques were used to characterize the Pt-Ga / Al 2 O 3 reduction characteristics and hydrogen absorption properties, and the mechanism of action of Ga in the catalyst was discussed.