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Impact of Alkali and Alkali‐Earth Cations on Ni‐Catalyzed Dimerization of Butene
Author(s) -
Ehrmaier Andreas,
Löbbert Laura,
SanchezSanchez Maricruz,
BermejoDeval Ricardo,
Lercher Johannes
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202000349
Subject(s) - alkali metal , catalysis , isomerization , chemistry , butene , inorganic chemistry , alkaline earth metal , lewis acids and bases , 1 butene , aluminosilicate , organic chemistry , ethylene
The presence of alkali (Na + or Li + ) or alkali‐earth (Ca 2+ or Mg 2+ ) cations adjusting the acid‐base properties on amorphous silica‐alumina influences markedly the catalytic properties of supported Ni for 1‐butene dimerization. The low concentration of Brønsted acid sites on these catalysts reduces the double bond isomerization of butene and inhibits the formation of dimethylhexene as primary product. While the alkali and alkali‐earth cations act as weak Lewis acid sites, only Ni 2+ sites are catalytically active for dimerization of 1‐butene. n ‐Octene and methylheptene are formed selectively as primary products; dimethylhexene is a secondary product. The open environment of the Ni 2+ sites does not induce different reaction pathways compared to Ni 2+ in the pores of zeolites.