On the role of co-cations in nickel exchanged LTA zeolite for butene dimerization

被引：13

作者：

Ehrmaier, Andreas ^{[1
]}

Peitz, Stephan ^{[2
]}

Sanchez-Sanchez, Maricruz ^{[1
]}

Bermejo-Deval, Ricardo ^{[1
]}

Lercher, Johannes ^{[1
,3
]}

机构：

[1] Tech Univ Munich, Lehrstuhl Tech Chem 2, D-85748 Garching, Germany

[2] Evonik Performance Mat GmbH, D-45772 Marl, Germany

[3] Pacific Northwest Natl Lab, Inst Integrated Catalysis, POB 999, Richland, WA 99352 USA

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2019年 / 284卷

关键词：

Linear alkenes; Nickel Lewis acid; Dimerization; Butene isomerization; Nickel alkyl and LTA zeolite; HETEROGENEOUS OLIGOMERIZATION; PROPENE OLIGOMERIZATION; ETHYLENE DIMERIZATION; ALKANE SORPTION; CATALYSTS; 1-BUTENE; MECHANISM; SITE; ISOMERIZATION; PROPYLENE;

D O I：

10.1016/j.micromeso.2019.03.047

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Partially Ni2+ exchanged Li+, Mg2+, Ca2+ and Na+ LTA zeolites were investigated for 1-butene dimerization, all showing selectivities higher than 90% into n-octenes and methylheptene isomers. The presence of the co-cations influences the rate of 1-butene double bond isomerization, while the Ni concentration determines the rates of dimerization. With higher electronegativity of the co-cation, the relative rate of isomerization increased, increasing so the selectivity to branched dimers. The higher Sanderson electronegativity of Li+ and Mg2+, with respect to Na+, is hypothesized to better stabilize the pi-allyl Ni-complex-intermediate during butene isomerization. In consequence, the selectivity of alkene dimerization on Ni-exchanged zeolites can be tailored by acid-base properties of the alkali and alkali-earth cations.

引用

页码：241 / 246

页数：6