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Cited by 42 publications
(7 citation statements)
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References 12 publications
(7 reference statements)
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“…Mechanistic studies on Ni-based heterogeneous catalysts are complicated, in part because residual Brønsted acid (H + ) sites on supports also catalyze alkene dimerization and isomerization to form a mixture of terminal and internal alkene isomers, and in part because Ni + sites (Ni-SiO 2 , Ni-MCM-41, Ni–X, and Ni–Y), Ni 2+ sites (Ni-MCM-41, Ni-Beta, , Ni–X), and NiOH + sites (Ni-MCM-41) have been purported as candidate precursors to the Ni active sites. Terminal alkene products of ethene oligomerization on Ni-exchanged aluminosilicates (e.g., Y, MCM-22, MCM-36, MCM-41, , SBA-15, Beta , ) have been proposed to form at Ni + cations, while internal alkene isomers have been ascribed to contributions of secondary isomerization at residual H + sites.…”
Section: Introductionmentioning
confidence: 99%
“…Solid acids also catalyze concurrent hydrogen transfer and cyclization reactions, as well as skeletal and double-bond isomerization reactions that lead to isomers different from those initially formed in oligomerization events. The relative rates of these different reactions are influenced by the channel size in microporous solid acids, which allow selective diffusion of certain reactants and products and the potential preference for some transition states over others based on their size . Previous studies on zeolites (predominantly MFI frameworks) have shown that chain growth selectivity depends sensitively on temperature and residence time, both of which have a tendency to favor secondary reactions of the primary oligomers formed.…”
Section: Introductionmentioning
confidence: 99%
“…Over ASA, double bond isomerization of 1-butene to 2-butenes is reported to take place at −45 °C and oligomerization, hydrogen transfer, and cracking reactions proceed at room temperature on a clean catalyst surface . A high oligomerization rate of propene has also been reported for ASA materials at temperatures below 100 °C during batch and flow reactor experiments. , It should be noted that these properties of ASA materials are dependent on the catalyst preparation, and changing parameters, such as the silica to alumina ratio of the catalyst, can have a significant effect on its catalytic behavior. ,, In the present study, only one commercially available catalyst was used, and there is scope for improving on the present results by optimizing the catalyst.…”
Section: Resultsmentioning
confidence: 99%
“…Polymerization with solid-acid catalysts is gathering much attention due to their significant advantages: (1) facile separation of catalyst from the product is attained by filtration, (2) corrosion of reactor materials can be avoided, (3) no inactivation of catalyst is necessary, and (4) reuse of catalyst is available. Heteropolyacids [6][7][8][9][10], metal oxides [11,12], montmorillonite clay [13,14], and silicate gel of rare earth metals (yttrium, neodymium, and samarium) [15] have been investigated as the solid-acid catalysts for polymer synthesis. Specially, the heteropolyacids with Keggin structure are well known as effective solid-acid catalysts due to its strong Brønsted acid activity and high thermal stability [1][2][3]5].…”
Section: Introductionmentioning
confidence: 99%
“…One technique used for differentiation between Lewis and BrCnsted acid activity in silica-alumina cracking catalysts has been the comparison of activity before, and after treatment with sodium salts (Shephard, Rooney and Kemball, 1962) or with sodium hydroxide. It was believed that only BrCnsted sites would be "neutralized" by such treatments.…”
Section: Introductionmentioning
confidence: 99%