Recycling and Oligomerization Activity of Ni/Al Catalyst in a Biphasic System with Ionic Liquids

Abstract

The catalyst decomposition in homogeneously catalyzed reactions is a very important factor that has been studied for the oligomerization of n-butenes in a system of two liquid phases. A highly active catalyst [NiCl 2 (PMe 3 ) 2 ] was investigated with an emphasis on the long-term catalyst activity using N-methylpyrrole as a buffer. The recycling experiments indicated that this catalyst is viable for five runs. Furthermore, introducing aluminum chloride or an ionic liquid in small concentrations led to increased stability, though fine adjustments were necessary to arrive at optimal results.

Nickel Catalyzed Olefin Oligomerization and Dimerization

“…The oligomerization of 1-butene in N-methylpyrrole-buffered ionic liquid ([BMI][Cl]/AlCl 3 /NMP) was later studied in more details. 177,178 Systematic investigations of IL/NMP/Ni-(PMe 3 ) 2 Cl 2 ratios demonstrated that NMP and IL concentrations are critical parameters. The molar ratio of the IL to Nmethylpyrrole needs to be balanced at 1/10, since a high buffer concentration leads to catalyst blockage, whereas a low buffer concentration promotes the formation of higher oligomers.…”

“…Both activities and selectivities of homogeneous (PCy 3 ) 2 NiCl 2 -catalyzed propylene dimerization reactions with buffered AlCl 3 co-catalysts (Al/Ni=850, seem to correlate with this analysis. Catalyst precursor used for propylene dimerization in triphenylbismuth buffered Lewis acidic chloroaluminate ionic liquids The oligomerization of 1-butene in N-methylpyrrole-buffered ionic liquid ([BMI][Cl]/AlCl 3 /NMP) was later studied in more details 177,178. Systematic investigations of IL/NMP/Ni(PMe 3 ) 2 Cl 2 ratios demonstrated that NMP and IL concentrations are critical parameters.…”

“…Active systems were only observed when AlCl 3 was used as a Lewis acid. The recyclability of such systems has been recently optimized 178.…”

Preparation of supported Fe2O3‐Cl/β‐zeolite catalyst and its application in the selective oligomerization reaction of isobutene in mixed C4

“…Simple synthesis, controlled acid strength, gentle reaction conditions and repeatability are all advantages of supported catalysts 19‐22 . The high cost of ionic liquid catalysts is a drawback 23‐25 . In consideration of the characteristics of the above catalysts, the authors believe that supported molecular sieve catalysts are of great significance in the study of the application of selective oligomerization of isobutene.…”

“…[19][20][21][22] The high cost of ionic liquid catalysts is a drawback. [23][24][25] In consideration of the characteristics of the above catalysts, the authors believe that supported molecular sieve catalysts are of great significance in the study of the application of selective oligomerization of isobutene. Due to the higher decomposition temperature of FeCl 3 , calcination after equal volume impregnation is more conducive to the generation of ⊍-Fe 2 O 3 with larger particle size, and FeCl 3 aqueous solution has strong acidity so that the catalyst can be acid-treated, and the pore diameter of the catalyst can be enlarged.…”