CIESC Journal ›› 2023, Vol. 74 ›› Issue (6): 2427-2435.DOI: 10.11949/0438-1157.20230258

• Catalysis, kinetics and reactors • Previous Articles     Next Articles

Effect of Mg content on isobutane dehydrogenation properties over nanosheets supported Pt-In catalysts

Xiqing ZHANG1(), Yanting WANG1(), Yanhong XU2, Shuling CHANG1, Tingting SUN1, Ding XUE3, Lihong ZHANG1()   

  1. 1.School of Chemical Engineering, Tianjin University, Tianjin 300350, China
    2.School of Chemical and Environmental Engineering, Pingdingshan University, Pingdingshan 467000, Henan, China
    3.Tianjin Industrial Exhaust Resources Comprehensive Utilization Technology Engineering Center, Tianjin 300271, China
  • Received:2023-03-20 Revised:2023-05-28 Online:2023-07-27 Published:2023-06-05
  • Contact: Lihong ZHANG

Mg量影响的纳米片负载Pt-In催化异丁烷脱氢性能

张希庆1(), 王琰婷1(), 徐彦红2, 常淑玲1, 孙婷婷1, 薛定3, 张立红1()   

  1. 1.天津大学化工学院,天津 300350
    2.平顶山学院化学与环境工程学院,河南 平顶山 467000
    3.天津市工业尾气资源综合利用技术工程中心,天津 300271
  • 通讯作者: 张立红
  • 作者简介:张希庆(1997—),男,硕士研究生,zhangxiqing1997@163.com
    王琰婷(1998—),女,硕士研究生,w2016016061@163.com
  • 基金资助:
    国家自然科学基金项目(21776214)

Abstract:

A series of hydrotalcite nanosheets with different Mg content were in-situ constructed on the surface of Al2O3 support by one-step synthesis method. And promoter In and active component Pt were introduced in the nanosheets by consecutive impregnation-reconstruction method. Furthermore, the supported Pt-In bimetallic catalysts PtIn/HTR-x (x = 0.05, 0.1, 0.15, 0.2 mol·L-1) were prepared by calcination and reduction. The relationship between the structure, physical and chemical properties of the catalyst and its precursor and the direct dehydrogenation performance of isobutane was explored. The results show that the Mg2+ concentrations determine the nanosheets thickness, which affects the structure, reducibility, surface chemical states, and surface acidity and dehydrogenation properties of these catalysts. The catalyst with Mg2+ concentration of 0.15 mol·L-1 exhibits the optimum dehydrogenation performance, of which the isobutene yield reaches 58%. The excellent activity, selectivity and stability of PtIn/HTR-0.15 are attributed to the maximum specific surface area, strong metal-support interaction and high surface In3+/In0 atomic ratio, and the good anti-carbon deposition performance is related to the low concentration and weak strength of surface strong acid sites.

Key words: isobutane, dehydrogenation, catalyst, hydrotalcite nanosheets, Mg concentration, carbon deposition

摘要:

采用一步法在Al2O3表面原位生长一系列Mg含量不同的超薄水滑石纳米片,并采用分步浸渍复原法逐步引入助剂In和活性组分Pt,进一步通过焙烧和还原处理制备了负载Pt-In双金属催化剂PtIn/HTR-x(x = 0.05,0.1,0.15,0.2 mol·L-1)。探究了催化剂及其前体的结构、物化性能与异丁烷直接脱氢性能之间的关系。结果表明,制备母液中Mg2+浓度会影响纳米片厚度,进而影响催化剂结构、还原能力、表面化学状态、表面酸性和脱氢性能。当Mg2+浓度为0.15 mol·L-1时,催化剂获得最佳脱氢性能,其中异丁烯产率高达58%。催化剂PtIn/HTR-0.15优异的活性、选择性、稳定性及良好的抗积炭性能与催化剂高的比表面积、低的强酸量和酸强度、强的金属载体相互作用以及高的表面In3+/In0原子比有关。

关键词: 异丁烷, 脱氢, 催化剂, 水滑石纳米片, Mg浓度, 积炭

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