热处理条件对IrSn纳米颗粒结构及丙烷脱氢性能影响

Effects of Calcination on the Structure and Performance of Propane Dehydrogenation over IrSn Bimetallic Nanoparticles

丙烷脱氢是低碳烯烃生产和页岩气高附加值应用的重要途径之一。通常负载型Pt-Sn双金属催化剂用于该过程面临催化剂失活快、再生流程繁琐的问题。Ir作为配位金属在均相脱氢反应中被证明具有很高的C-H键活化能力,但应用于多相催化的烷烃脱氢反应未见报道。本文通过改变IrSn双金属催化剂的合成条件,探讨焙烧对Ir-Sn双金属纳米颗粒结构及催化丙烷脱氢性能影响。结果表明,焙烧不仅导致催化剂纳米颗粒严重烧结,而且降低双金属纳米颗粒合金化程度,极大影响催化性能。

Propane dehydrogenation(PDH)is one of the most promising technology for propylene production and utilization of shale gas.Usually,supported Pt-Sn bimetallic catalysts for dehydrogenation process suffer from rapid deactivation and complicated regeneration process.Metal Ir as active metal have been shown high activity for C-H bonds activation,but there is rare report of supported Ir solid catalysts for PDH.In this work,by controlling the synthesis conditions of IrSn bimetallic catalyst,the effects of the calcination process on the structure and propane dehydrogenation performance of bimetallic nanoparticles were investigated.The results show that the process of calcination not only leads to severe sintering of catalyst nanoparticles,but also reduces the alloying of nanoparticles,which greatly affects the catalytic performance.