Trimerization and tetramerization of ethylene in continuous gas-phase reaction using a Cr-based supported liquid phase catalyst†,Reaction Chemistry & Engineering

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Trimerization and tetramerization of ethylene in continuous gas-phase reaction using a Cr-based supported liquid phase catalyst†
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2018-11-19 00:00:00 , DOI: 10.1039/c8re00179k
Tobias Müller _{1,

2,

3,

4} , John Thomas Dixon _{5,

6,

7} , Marco Haumann _{1,

2,

3,

4} , Peter Wasserscheid _{1,

2,

3,

4}

Affiliation

Homogeneous Cr–PNP tri- and tetramerization catalysts were dissolved together with the co-catalyst MAO in the high-boiling, non-polar, aliphatic hydrocarbon perhydro-dibenzyltoluene (H18-DBT). The solution was then dispersed onto different high surface area supports. The resulting solid materials were tested in the gas-phase selective oligomerization of ethylene at 43 °C and pressures between 1 and 14 bar. Low activities were observed at ambient pressure. At ethylene pressures of higher than 3 bar the formed 1-hexene and 1-octene condensed inside the porous system, thereby facilitating the dissolution and redistribution of the Cr–PNP catalyst. Further studies were conducted at pressures up to 35 bar at which a change in the primary reaction selectivity from 1-hexene to 1-octene could be observed. Such a selectivity switch is in accordance with previously reported mechanistic and kinetic studies.

中文翻译：

使用Cr基负载型液相催化剂在连续气相反应中乙烯的三聚和四聚†

均相Cr-PNP三聚和四聚催化剂与助催化剂MAO一起溶解在高沸点，非极性，脂族烃全氢二苄基甲苯（H18-DBT）中。然后将溶液分散到不同的高表面积载体上。在43℃和1至14巴之间的压力下，在乙烯的气相选择性低聚中测试了所得的固体材料。在环境压力下观察到低活性。在乙烯压力高于3 bar时，形成的1-己烯和1-辛烯在多孔系统中冷凝，从而促进Cr-PNP催化剂的溶解和重新分布。在高达35 bar的压力下进行了进一步的研究，在该压力下可以观察到一级反应选择性从1-己烯变为1-辛烯的变化。

更新日期：2018-11-19

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