Preparation of Pt-SnE/Mg (Al) O catalyst by anion exchange method and its performance in alkane dehydrogenation
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摘要: 以水滑石为载体, 采用离子交换法制备了Pt-SnE/Mg (Al) O催化剂, 并对其进行了X射线衍射、N2物理吸附、透射电镜等技术表征; 考察了该离子交换法制备的Pt-SnE/Mg (Al) O催化剂对乙烷和丙烷脱氢的催化性能, 并与浸渍法制备的Pt-SnI/Mg (Al) O催化剂进行了比较。结果表明, 利用离子交换法制备的Pt-SnE/Mg (Al) O催化剂其反应活性和稳定性明显优于浸渍法制备Pt-SnI/Mg (Al) O催化剂的。在相同条件下反应2 h后, Pt-SnE/Mg (Al) O催化剂和Pt-SnI/Mg (Al) O催化剂的乙烷催化脱氢转化率分别为12.2%和3.1%, 丙烷催化脱氢转化率分别为38.7%和26.4%。Abstract: Pt-SnE/Mg (Al) O catalyst was prepared by anion exchange method with hydrotalcite as the support. The Pt-SnE/Mg (Al) O catalyst was characterized by XRD, nitrogen sorption, CO-TPD and TEM; its catalytic performance in the dehydrogenation of ethane and propane was compared with that the Pt-SnI/Mg (Al) O catalyst obtained by impregnation method. The results indicate that under the same reaction conditions, the conversions of ethane over the Pt-SnE/Mg (Al) O and Pt-SnI/Mg (Al) O catalysts are 12.2% and 3.1%, respectively, whist the conversions of propane over these two catalysts are 38.7% and 26.4%, respectively. Such results illustrate that the Pt-SnE/Mg (Al) O catalyst prepared by the anion exchange method is obviously superior to the Pt-SnI/Mg (Al) O catalyst prepared by the impregnation method in terms of catalytic activity and stability for alkane dehydrogenation.
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Key words:
- platinum /
- hydrotalcite /
- Mg (Al) O /
- anion exchange /
- ethane dehydrogenation /
- propane dehydrogenation
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表 1 催化剂BET比表面积和孔容
Table 1 BET surface area and pore volume of the Pt-SnE/Mg (Al) O and Pt-SnI/Mg (Al) O catalysts
Catalyst Specific area
A/(m2·g-1)Pore volume
v/(cm3·g-1)Pt-SnI/Mg (Al) O 37.5 0.32 Pt-SnE/Mg (Al) O 84.8 0.54 表 2 催化剂XPS结果
Table 2 XPS results of the Pt-SnE/Mg (Al) O and Pt-SnI/Mg (Al) O catalysts
Catalyst Binding energy E/eV Pt-SnE/Mg (Al) O 485.4(25.8%) 486.2(51.2%) 486.9(23.0%) Pt-SnI/Mg (Al) O 485.5(23.7%) 486.2(58.4%) 487.0(17.9%) -
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