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Co-catalyst free ethene dimerization over Zr-based metal-organic framework (UiO-67) functionalized with Ni and bipyridine

DOI: 10.1016/j.cattod.2020.03.038 DOI Help

Authors: Mustafa Komurcu (University of Oslo) , Andrea Lazzarini (University of Oslo) , Gurpreet Kaur (University of Oslo) , Elisa Borfecchia (University of Turin) , Sigurd Øien-ødegaard (University of Oslo) , Diego Gianolio (Diamond Light Source) , Silvia Bordiga (University of Oslo; University of Turin) , Karl Petter Lillerud (University of Oslo) , Unni Olsbye (University of Oslo)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Catalysis Today

State: Published (Approved)
Published: March 2020
Diamond Proposal Number(s): 21713

Open Access Open Access

Abstract: Ni functionalized metal organic frameworks (MOF) are promising heterogeneous ethene dimerization catalysts. Activities comparable to or higher than Ni-aluminosilicates have been reported in literature. However, unlike the Ni-aluminosilicates, those Ni-MOFs require a large excess of co-catalyst to initiate the dimerization process and some catalysts generate polymers which lead to catalyst deactivation. Herein, we report a series of Ni(II) and 2,2′-bipyridine-5,5′-dicarboxylate (bpy) functionalized UiO-67 MOF that catalyze the ethene dimerization reaction co-catalyst free. The catalysts were active for ethene dimerization (up to 850 mg butene gcat-1 h-1) after activation at 300 °C in 10 % O2 for 360 min and subsequent exposure to flowing ethene (P(ethene) =26 bar, 250 °C) for 240 min. The catalysts yielded up to 6 % conversion with 99 % selectivity to linear 1- and 2-butenes, which formed in non-equilibrated ratios. Overall, the test data indicate that all three linear butenes are formed on a single active site, in accordance with the Cossee-Arlman mechanism. Ex situ XAS and CO FT-IR spectroscopy studies point towards Ni monomers or, plausibly, low-nuclearity Ni-multimers, docked at bpy linkers with Ni-Ni distances > 4 Å, as the main active site for the ethene dimerization reaction.

Journal Keywords: Ethene dimerization; Linear alkenes; Ni-MOF; Heterogeneous catalysis; Co-catalyst free

Subject Areas: Chemistry

Instruments: B18-Core EXAFS