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Removal of hydrogen poisoning by electrostatically polar MgO support for low pressure NH3 synthesis at high rate over Ru catalyst

DOI: 10.1021/acscatal.0c00954 DOI Help

Authors: Simson Wu (University of Oxford) , Yung-kang Peng (University of Oxford) , Tianyi Chen (University of Oxford) , Jiaying Mo (University of Oxford) , Alex Large (University of Reading) , Ian Mcpherson (University of Oxford) , Hung-lung Chou (National Taiwan University of Science and Technology) , Ian Wilkinson (Siemens plc) , Federica Venturini (Diamond Light Source) , David Grinter (Diamond Light Source) , Pilar Ferrer Escorihuela (Diamond Light Source) , Georg Held (Diamond Light Source) , Shik Chi Edman Tsang (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Catalysis

State: Published (Approved)
Published: April 2020

Abstract: The increasing availability of low-cost and low pressure, renewable H2 from wind and solar means has triggered tremendous interest in developing low pressure ammonia synthesis with N2 as energy carrier as well as green fertilizer. As such Cs-promoted Ru/MgO catalysts used in Kellogg process show superiority to Fe-based catalysts at milder conditions, however, as known, the surface poisoning of Ru sites by competitive strong H2 dissociative adsorption limits the overall rate. It is demonstrated for the first time that the use of simple polar MgO(111) to replace non-polar MgO as support can significantly alleviate the hydrogen poisoning and facilitate an unprecedented ammonia production rate by its high intrinsic proton capture ability.

Journal Keywords: Ammonia synthesis; hydrogen poisoning; electrostatically polar surface; proton capture; nano-catalysts

Subject Areas: Chemistry

Instruments: B07-C-Versatile Soft X-ray beamline: Ambient Pressure XPS and NEXAFS