Pt-Ga/HZSM-5催化剂上丙烷芳构化

考察了Ｐｔ／ＨＺＳＭ－５，Ｇａ／ＨＺＳＭ－５和Ｐｔ－Ｇａ／ＨＺＳＭ－５上的丙烷芳构化反应，其中Ｐｔ－Ｇａ／ＨＺＳＭ－５双组份催化剂上有较高的丙烷反应活性和芳烃选择性，用程序升温还原（ＴＰＲ）和Ｈ２化学吸附法表征催化剂，发现Ｐｔ与Ｇａ的协同相互作用促进了Ｇａ＾３＋的还原，使其峰温向低温移动的７０℃，且双组分催化剂中Ｐｔ的Ｈ２吸附性能大大降低，使催化剂表成乙烯加氢能力降低，从而提高了产物芳烃的选择性，

Propane Aromatization over Pt-Ga/HZSM-5 Catalyst

Direct conversion of propane to aromatics was investigated on Pt/HZSM5, Ga/HZSM-5 and Pt-Ga/HZSM-5 catalysts. Platinum introduction into Ga/HZSM-5 resulted in an increase of both the activity and selectivity of propane aromatization. Temperature programmed reduction (TPR) and volumetric chendsorption of H2 have been used to provide insight into the functions of Ga and Pt in Pt-Ga/HZSM-5. Synergistic action of Pt and Ga promotes the reduction of Ga3 to Ga causing reduction temPerature of Ga sites shifting to a lower temPeratuxe and decreases remarkably the amounts of H2 adsorbed on Pt sites and thus decreases the ability of alkane hydrogenolysis. It was also found that Pt in Pt-Ga/HZSM-5 plays an imPortant role to improve the cataIystic stability. BifunctionaI roles of Pt and Ga were proposed to understand the catalytic behaviors of Pt- Ga/HZSM-5.