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Coke Formation on Pt–Sn/Al2O3 Catalyst for Propane Dehydrogenation
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-06-19 , DOI: 10.1021/acs.iecr.8b01313
Hai-Zhi Wang 1 , Li-Li Sun 1 , Zhi-Jun Sui 1 , Yi-An Zhu 1 , Guang-Hua Ye 1 , De Chen 2 , Xing-Gui Zhou 1 , Wei-Kang Yuan 1
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Catalyst deactivation by coking is one major problem for propane dehydrogenation (PDH). To develop catalysts with high resistance to coke, the analysis of coke becomes essential. In this work, an analysis procedure is proposed and validated to acquire the detailed locations and compositions of the coke formed on an as-synthesized Pt–Sn/Al2O3 catalyst. This procedure combines high-resolution transmission electron microscopy (HRTEM), FT-IR, Raman, thermogravimetric analysis (TG), and pyrolysis GC-MS; with this procedure, the systematic and quantitative analysis of coke can be achieved. The results show that the coke is located on the metal, in the vicinity of the metal, and on the support. Besides, aliphatics, aromatics, and pregraphite cokes are identified, and they account for 69.0, 4.4, and 26.6 wt %, respectively. Finally, an in situ DRIFT study is performed, and the results show that the aliphatic coke can be transformed into the aromatic coke and this transformation is related to the deep dehydrogenation reactions.

中文翻译:

Pt-Sn / Al 2 O 3催化剂上丙烷脱氢焦炭的形成

通过焦化使催化剂失活是丙烷脱氢(PDH)的主要问题。为了开发对焦炭具有高抵抗力的催化剂,焦炭的分析变得至关重要。在这项工作中,提出了一种分析程序并进行了验证,以获取在合成的Pt-Sn / Al 2 O 3上形成的焦炭的详细位置和组成。催化剂。该程序结合了高分辨率透射电子显微镜(HRTEM),傅立叶变换红外(FT-IR),拉曼(Raman),热重分析(TG)和热解GC-MS。通过此程序,可以实现对焦炭的系统和定量分析。结果表明,焦炭位于金属上,金属附近和载体上。此外,鉴定出脂肪族,芳族和石墨碳,它们分别占69.0、4.4和26.6重量%。最后,进行了原位DRIFT研究,结果表明脂族焦可以转化为芳族焦,并且这种转化与深度脱氢反应有关。
更新日期:2018-06-19
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