小孔沸石上丙烯选择性生成乙烯的研究。
Investigation of the Selective Production of Ethylene from Propylene Over Small-Pore Zeolites.
作者信息
Jun Jong-Won, Kim Tae-Wan, Kim Chul-Ung
机构信息
Center for Convergent Chemical Process, Korea Research Institute of Chemical Technology, 141 Gjeong-ro, Yuseong, Daejeon 34114, Republic of Korea.
出版信息
J Nanosci Nanotechnol. 2019 Apr 1;19(4):2183-2188. doi: 10.1166/jnn.2019.15993.
The selective production of ethylene from the direct conversion of propylene (propylene-to-ethylene, PTE) was examined for the first time using various types of 8-membered ring (8-MR) zeolite materials with different pore structures. Among these 8-MR zeolites, SSZ-13 zeolite with a threedimensional chabazite structure exhibited the highest ethylene yield. To increase the ethylene selectivity further, the PTE reactions were conducted over SSZ-13 zeolite external surface modifications with silylation or phosphorus. The external surface modifications enhanced the ethylene selectivity due to the passivation of external acid sites. The surface-modified SSZ-13 catalyst exhibited the highest selectivity to ethylene, at more than 90% at 450 °C, a WHSV of 0.33 h, and a propylene particle pressure of 0.1 MPa.
首次使用具有不同孔结构的各种八元环（8-MR）沸石材料研究了由丙烯直接转化制乙烯（丙烯制乙烯，PTE）的选择性生产。在这些8-MR沸石中，具有三维菱沸石结构的SSZ-13沸石表现出最高的乙烯产率。为了进一步提高乙烯选择性，在经硅烷化或磷改性的SSZ-13沸石外表面上进行PTE反应。外表面改性由于外酸位点的钝化而提高了乙烯选择性。表面改性的SSZ-13催化剂对乙烯表现出最高的选择性，在450℃、WHSV为0.33 h⁻¹和丙烯分压为0.1 MPa时超过90%。
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