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Oligomerization of light olefins over ZSM-5 and beta zeolite catalysts by modifying textural properties
Applied Catalysis A: General ( IF 4.7 ) Pub Date : 2018-01-17 , DOI: 10.1016/j.apcata.2018.01.015
Sanggil Moon , Ho-Jeong Chae , Min Bum Park

The oligomerization of ethene and 1-hexene was performed under 35 bar and 200 °C over NiH- and H-forms of ZSM-5 and beta zeolite catalysts which had similar Si/Al and Ni content, but different textural properties. Among the H-zeolites, H-ZSM-5 and H-beta composed of nanometer scale (ca. 10 nm) sheet-like crystals, as well as intercrystalline mesoporosity (ca. 5 nm), were found to be much more efficient for the oligomerization of 1-hexene to liquid fuel range products higher than C10 (C10 + ). In the oligomerization of ethene, identically prepared ZSM-5 and beta zeolites but with further exchange with Ni ion, also showed higher activity with remarkable C10+ product selectivity (>80%) after a single stage oligomerization, as compared to the corresponding cation form of ZSM-5 and beta zeolites without nanocrystalline and mesoporous morphology (conversion < 50% and C10+ selectivity < 30%). These results demonstrate that both small crystal size and the mesoporosity of the zeolite catalyst are critical factors for improving the diffusion limitation during the oligomerization of light olefins. This improvement was accompanied by a shift in major oligomeric product selectivity toward C10+ hydrocarbons.



中文翻译:

轻质烯烃在ZSM-5和β沸石催化剂上的低聚反应,可通过改变其结构特性来实现

乙烯和1-己烯的低聚反应是在35 bar和200°C的ZSM-5和β沸石的NiH和H型催化剂上进行的,该催化剂具有相似的Si / Al和Ni含量,但具有不同的织构性质。在H型沸石中,发现由纳米级(约10 nm)片状晶体组成的H-ZSM-5和H-β以及晶间介孔(约5 nm)对于制备H型沸石更为有效。 1-己烯向液体燃料的低聚产物比C 10(C 10  +)高。在乙烯的低聚反应中,制备相同的ZSM-5和β沸石但与镍离子进一步交换,在较高的C 10含量下也表现出较高的活性。与没有纳米晶和介孔形态的ZSM-5和β沸石的相应阳离子形式相比,单阶段低聚后的+产物选择性(> 80%)(转化率<50%和C 10 +选择性<30%)。这些结果表明,小晶体尺寸和沸石催化剂的介孔率都是改善轻烯烃低聚过程中扩散极限的关键因素。这种改善伴随着主要的低聚产物选择性向C 10 +烃的转移。

更新日期:2018-01-17
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