Impact of Alkali and Alkali-Earth Cations on Ni-Catalyzed Dimerization of Butene
The presence of alkali (Na+ or Li+) or alkali-earth (Ca2+ or Mg2+) 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 Br?nsted 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 Ni2+ 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 Ni2+ sites does not induce different reaction pathways compared to Ni2+ in the pores of zeolites.
Ehrmaier, Andreas,L?bbert, Laura,Sanchez-Sanchez, Maricruz,Bermejo-Deval, Ricardo,Lercher, Johannes
p. 3705 - 3711
(2020/06/08)
METHOD FOR PRODUCING O-XYLENE
A process for preparing o-xylene comprises the steps of a) dimerizing 2-butenes to 3,4- and/or 2,3-dimethylhexenes andb) aromatizing the 3,4- and/or 2,3-dimethylhexenes under dehydrogenating conditions to give o-xylene and is suitable for the selective preparation of o-xylene.
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Page/Page column 13
(2010/01/31)
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