首页|Identification of uniform high-density isolated Ni active sites on LTA zeolite for propylene dimerization

Identification of uniform high-density isolated Ni active sites on LTA zeolite for propylene dimerization

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  • NSTL
  • Elsevier
The well-dispersed Ni-LTA-derived catalysts with high-density Ni sites were fabricated by the ion-exchanged method, where the degraded LTA structure as a sacrificial component promoted the dispersion of Ni sites. As Ni content reached 11.6 wt%, an excellent catalyst efficiency (0.075 molC3/(gcat center dot h)) and an outstanding propylene consumption rate on a per Ni basis (38.3 molC3/(molNi center dot h)) with ~100% selectivity to oligomers containing 75.1% of C6 were obtained for propylene dimerization under mild conditions (70 degrees C, 2.5 MPa and WHSV = 3.6 h-1). Moreover, it has been proposed that the three-coordinated Ni2+ ion in a trigonal structure is the active site. The uniform coordinatively unsaturated Ni2+ ion in the ion-exchanged Ni-LTA catalysts, presenting a strong Lewis acid concentration, boosts the catalytic activity for the propylene dimerization, whereas NiO nanoparticles are confirmed to be spectators for the reaction. The understanding of Ni active sites promotes the rational design of improved catalysts for the dimerization of light olefins.

Propylene dimerizationLTA zeoliteIsolated Ni active siteThree-coordinated structureHigh efficiencyPROPENE OLIGOMERIZATIONOLEFIN OLIGOMERIZATIONBUTENE DIMERIZATIONHETEROGENEOUS OLIGOMERIZATIONETHYLENE OLIGOMERIZATIONETHENE DIMERIZATIONNICKEL-CATALYSTSSUPPORTMETALIONS

Ling, Yu、Chen, Xiao、Meng, Jipeng、Liang, Changhai

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Dalian Univ Technol

2022

10.1016/j.apcata.2022.118661

Applied Catalysis

Applied Catalysis

ISSN：0926-860X
年,卷(期)：2022.640
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