In the direct gas-phase epoxidation of propylene, the channels of TS-1 are easily blocked by the carbon deposition which leads to poor stability and even deactivation of the catalyst. In this paper, H-TS-1 molecular sieve with hollow structure was successfully synthesized by the post-treatment of TS-1 molecular sieve with tetrapropylammonium hydroxide (TPAOH) solution. The experimental results show that the Au/H-TS-1 catalyst exhibits good stability compared with Au/TS-1. TG results show that the weight of carbon deposition is only ∼3.56 wt% in Au/H-TS-1 at the reaction time of 50 h compared with Au/TS-1 catalyst (∼8.55 wt%). The introduction of hollow structure improves the mass transfer ability of the catalyst which could reduce the formation of carbon deposition and improve the stability of Au/H-TS-1 in propylene epoxidation. The PO formation rate of Au/H-TS-1 only decreased by ∼10.3 % after 100 h, while that of Au/TS-1 decreased by ∼28.3 %.

中文翻译：

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Au/TS-1引入空心结构对提高丙烯环氧化稳定性的影响

在丙烯直接气相环氧化反应中，TS-1的孔道很容易被积碳堵塞，导致催化剂稳定性差，甚至失活。本文通过四丙基氢氧化铵(TPAOH)溶液对TS-1分子筛进行后处理，成功合成了具有中空结构的H-TS-1分子筛。实验结果表明，与Au/TS-1相比，Au/H-TS-1催化剂表现出良好的稳定性。 TG结果表明，与Au/TS-1催化剂（~8.55 wt%）相比，在反应时间为50 h时，Au/H-TS-1中的积炭重量仅为~3.56 wt%。空心结构的引入提高了催化剂的传质能力，减少了积碳的形成，提高了Au/H-TS-1在丙烯环氧化反应中的稳定性。 100小时后，Au/H-TS-1的PO形成率仅下降~10.3%，而Au/TS-1的PO形成率下降~28.3%。