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Identification of C2-C5 products from CO2 hydrogenation over PdZn/TiO2-ZSM-5 hybrid catalysts

DOI: 10.1039/D0FD00135J DOI Help

Authors: Jonathan Ruiz Esquius (Cardiff Catalysis Institute) , Hasliza Bahruji (University Brunei Darussalam) , Michael Bowker (Cardiff Catalysis Institute, Cardiff University; Research Complex at Harwell) , Graham Hutchings (Cardiff Catalysis Institute, Cardiff University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Faraday Discussions

State: Published (Approved)
Published: February 2021
Diamond Proposal Number(s): 19850

Open Access Open Access

Abstract: The combination of a methanol synthesis catalyst and a solid acid catalyst opens the possibility to obtain olefins or paraffins directly from CO2 and H2 in one step. In this work several PdZn/TiO2-ZSM-5 hybrid catalysts were employed under CO2 hydrogenation conditions (240-360 °C, 20 bar, CO2/N2/H2 = 1/1/3) for the synthesis of CH3OH, consecutive dehydration to dimethyl ether and further oxygenate conversion to hydrocarbons. No significant changes after 36 h reaction on the methanol synthesis catalyst (PdZn/TiO2) were observed by XRD, XAS or XPS. No olefins were observed, indicating that light olefins undergo further hydrogenation under reaction conditions, yielding the corresponding alkanes. Increasing the aluminium sites in the zeolites (Si:Al ratio 80:1, 50:1 and 23:1) lead to a higher concentration of mild Brønstead acid sites promoting hydrocarbon chain growth.

Journal Keywords: CO2 hydrogenation; PdZn alloy catalyst; zeolites ZSM-5; hybrid catalyst; methanol; dimethyl-ether; light hydrocarbons; methanol-to-olefins

Subject Areas: Chemistry, Energy

Instruments: B18-Core EXAFS

Added On: 01/03/2021 13:25


Discipline Tags:

Energy Storage Earth Sciences & Environment Sustainable Energy Systems Energy Climate Change Physical Chemistry Catalysis Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)