Abstract Mo/HZSM-5 is the most active catalyst for dehydroaromatization of methane to benzene reaction. In this process, coking is the major problem to develop technically and economically successful process, as the catalyst gets deactivated due to blocking of active sites, pores and cavities, resulting in site poisoning. Hence, detailed information on the nature of the coke, its structure and composition are important factors to understand the performance of the catalyst. In the present paper, we present characterization of carbonaceous deposits formed on the surface of Mo/HZSM-5 catalyst using multi analytical techniques such as TDS-GC–MS, TGA, CHN and TEM. Investigated the structures of soft coke species using N2, and H2 temperature programmed desorption by applying in-house designed micro reactor for coke desorption from spent catalyst, followed by detailed composition analysis by TDS-GC–MS technique. The thermal desorption GC–MS method has advantages over the existing solvent extraction methods, in terms of sensitivity, overall analysis time and sample quantity requirements for complete studies. Additionally, this setup provides flexibility to understand the regeneration mechanism of catalyst under various environment and temperature conditions. The new in-house setup has given useful insights into structures of coke components and possible regeneration protocols.

中文翻译：

---

Mo/HZSM-5催化剂中含碳沉积物的热解吸和表征

摘要 Mo/HZSM-5是甲烷脱氢芳构化制苯反应活性最强的催化剂。在这个过程中，焦化是开发技术和经济上成功的过程的主要问题，因为催化剂由于活性位点、孔洞和空腔的堵塞而失活，导致位点中毒。因此，关于焦炭性质、其结构和组成的详细信息是了解催化剂性能的重要因素。在本文中，我们使用多分析技术，如 TDS-GC-MS、TGA、CHN 和 TEM，对在 Mo/HZSM-5 催化剂表面形成的碳沉积物进行表征。通过应用内部设计的微型反应器从废催化剂中解吸焦炭，研究了使用 N2 和 H2 程序升温解吸的软焦物种的结构，然后通过 TDS-GC-MS 技术进行详细的成分分析。热解吸 GC-MS 方法在灵敏度、整体分析时间和完整研究的样品数量要求方面优于现有的溶剂萃取方法。此外，这种设置为了解催化剂在各种环境和温度条件下的再生机制提供了灵活性。新的内部设置为焦炭组分的结构和可能的再生方案提供了有用的见解。这种设置为了解催化剂在各种环境和温度条件下的再生机制提供了灵活性。新的内部设置为焦炭组分的结构和可能的再生方案提供了有用的见解。这种设置为了解催化剂在各种环境和温度条件下的再生机制提供了灵活性。新的内部设置为焦炭组分的结构和可能的再生方案提供了有用的见解。