反应时间对镁碳复合储氢材料用于噻吩催化加氢反应的影响

Effect of Reaction Time on Catalytic Hydrogenation of Thiophene by Mg/C Composite for Hydrogen Storage

噻吩及其衍生物是裂化石油中的主要含硫成分,研究噻吩的加氢脱硫技术对提高燃油品质、增强环境保护具有重要意义。本文采用反应球磨法在氢气气氛下制备了镁碳复合储氢材料,并应用于固定床管式反应装置进行噻吩的催化加氢反应研究,着重考察了不同反应时间阶段的加氢反应产物、噻吩转化率和固硫量结果。结果表明,材料具有较优异的放氢性能,受热释放出的活性氢在较温和的条件下可与噻吩发生加氢反应。随着反应时间的延长,固相产物中MgH2不断解离出Mg并释放出高活性氢,至2h时几乎完全分解;气相产物中先后检测到了CH4、C2H6、C3H6、C3H8、n-C4H8、nC4H10、c/t-C4H8等的存在;噻吩转化率先增大后减小,储氢材料中的固硫量先增大后逐渐趋于稳定。

Thiophene and its derivatives are the main sulfur components of cracking petroleum.It is of great significance for fuel quality improvement and environmental protection to study hydrodesulfurization technologies of thiophene.Mg/C composite for hydrogen storage was prepared by reactive ball milling method under H2 atmosphere.Catalytic hydrogenation experiment of thiophene was performed in a fixed bed tubular reactor,and effect of reaction time on hydrogenation products,thiophene conversion,and solid sulfur content was investigated emphatically.Results indicate that the material has preferable dehydrogenation performance,and that activated hydrogen released from the material by heating can react with thiophene under a mild condition.MgH2 in the solid phase products is decomposed gradually with reaction time,and it cannot be found after 2hrs reaction.CH4,C2H6,C3H6,C3H8,n-C4H8,n-C4H10 and c/t-C4H8 are detected successively in gas phase products.Thiophene conversion increases first and then decreases.And the solid sulfur content in hydrogen storage material increases first and then tends to be stable.