期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 7, 页码 6654-6661出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b05703
关键词
Ethylene dimerization; catalyst deactivation; heterogeneous catalysis; catalyst lifetime; X-ray absorption spectroscopy
资金
- Saudi-Aramco, National Science Foundation [DMR-1452612]
Metal organic frameworks (MOFs) hold great promise as structurally tunable catalysts capable of high selectivity in the solid state, yet their comparatively high cost and often limited stability remain significant concerns for their commercialization as heterogeneous catalysts. Here, we report detailed X-ray absorption spectroscopy studies of Co-and Ni-MFU-4l, a class of highly selective MOF catalysts for olefin upgrading, and reveal mechanisms that lead to their deactivation. We further show that Ni-CFA-1, a more scalable and economical alternative to Ni-MFU-4l, reproduces both the local coordination structure and the high selectivity of the latter in ethylene dimerization catalysis. Under optimal conditions, Ni-CFA-1 activated by MMAO-12 achieves a turnover frequency of 37100 per hour and a selectivity of 87.1% for 1-butene, a combination of activity, selectivity, and affordability that is unmatched among heterogeneous ethylene dimerization catalysts. Ni-CFA-1 retains its high activity for at least 12 h in a one-liter semibatch reactor, offering a strategy toward robust and scalable MOFs for industrial catalysis.
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