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助剂Ga对Pt基催化剂脱氢性能的影响
石油化工高等学校学报
2024年 37卷 第No.5期
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Title
Effect of Additive Ga on Dehydrogenation Performance of Pt⁃Based Catalyst
Authors
Mingming ZHAO
Mingyuan LOU
Xilin PIAO
Haotian CHI
Haijuan ZHANG
单位
辽宁石油化工大学 石油化工学院,辽宁 抚顺 113001
Organization
School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China
摘要
通过添加助剂调控Pt基催化剂的活性相,可以达到提高催化剂选择性和稳定性的目的。以Ga为助剂,通过改变n(Ga)/n(Pt)调控Pt基催化剂的活性相,并采用BET、FT-IR、TG、H2-TPR等手段对其进行了表征;在反应温度为580 ℃、体积空速为2 000 h-1、氢烃比(氢气与丙烷的体积比)为1的条件下,研究了Pt基催化剂脱氢性能。结果表明,Pt7Ga/Al2O3催化剂中的Pt粒径最小,分散性最好;Pt7Ga/Al2O3催化剂脱氢性能最好,反应3 h的丙烯选择性为90.98%,比PtSn/Al2O3催化剂高3.01%;Ga的调控增强了Pt与载体Al2O3间的作用力,降低了催化剂的酸性和催化剂的石墨化程度。
Abstract
The selectivity and stability of Pt?based catalysts can be improved by adjusting the active phase by adding additives. The active phase of Pt?based catalyst was regulated by changing n(Ga)/n(Pt) with Ga as an additive and characterized by BET, FT-IR, TG, H2-TPR, etc. The n(Ga)/n(Pt) of the active phase was optimized under the reaction temperature of 580 ℃, volume space velocity of 2 000 h-1 and hydrogen?hydrocarbon ratio (volume ratio of hydrogen to propane) of 1. The results show that the Pt in the Pt7Ga/Al2O3 catalyst has the smallest particle size and the best dispersion.The Pt7Ga/Al2O3 catalyst has the best dehydrogenation performance, and the propylene selectivity of the reaction for 3 h was 90.98%, which was 3.01% higher than that with the PtSn/Al2O3 catalyst. The regulation of Ga can enhance the interaction force between Pt and Al2O3 support, lower the acidity of catalyst and the degree of graphitization of catalyst carbon deposition.
关键词:
Pt基催化剂;
丙烷脱氢;
活性相;
助剂Ga;
石墨化程度;
Keywords:
Pt based catalyst;
Propane dehydrogenation;
Active phase;
Additive Ga;
Degree of graphitization;
基金项目
辽宁省联合基金项目(U1908203);辽宁省教育厅面上项目(JYTMS20231438)
DOI
10.12422/j.issn.1006-396X.2024.05.006