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A Highly Selective CrO/nano-ZSM-5 Bifunctional Catalysts for CO Hydrogenation to Aromatics

Russian Journal of Applied Chemistry, ISSN: 1608-3296, Vol: 95, Issue: 2, Page: 296-307
2022
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The direct conversion of CO to aromatics is an effective strategy for simultaneously achieving carbon neutrality and its resource utilization. However, it is a great challenge to efficient CO conversion to high value-added aromatics due to the chemical inertness and characteristics of multi-path conversion of CO. To address this, a series of nanosized ZSM-5 zeolites [NZ5(x)] with different acid amount and strength were synthesized using a seed-induced template-free method via changing the initial gel composition. The CrO nanoparticle was prepared by simple precipitation method. The performance of the CrO/NZ5(x) bifunctional catalysts composed of CrO and nano-ZSM-5 zeolites with different acidity, and mixed CrO with NZ5 (50) by different ways in the CO hydrogenation reaction was studied. The CrO/NZ5(50) catalyst with suitable acidity and closest metal-acid site distance exhibited the highest aromatics selectivity of 87.2% among all hydrocarbon products at CO single-pass conversion of 13.6%, which is due to the synergistic effect between the acid sites of the nanosized ZSM-5 zeolite and metal sites provide by CrO with abundant oxygen vacancies.

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