Evaluation of the potassium incorporation method in MgFe catalysts derived from layered double hydroxides in the hydrogenation of CO₂

Author(s)

Goncalves, Rosembergue Gabriel Lima ; Catuzo, Gabriel Liscia ; Assaf, Jose Mansur ; Assaf, Elisabete Moreira

• Document type: Journal article
• Source: CATALYSIS TODAY; v. 448, p. 8-pg., 2024-12-30.

Abstract

This study investigated catalysts derived from layered double hydroxides (LDH) with and without potassium in the Reverse Water Gas-Shift (RWGS) reaction. According to the results, despite the addition of potassium reducing the catalysts<acute accent>porosity and altering their morphology, K improved their efficiency by decreasing CH4 production and increasing selectivity towards CO. An evaluation of the K impregnation method demonstrated when not calcined prior to the impregnation process with 5 wt% of K (MgFe/K), the material showed better catalytic performance in comparison to catalysts calcined at 500 (MgFe500/K) and 800 degrees C (MgFe500/K). Adjustments in parameters such as temperature, gas flow rates, and H2:CO2 ratio offer a pathway for increasing selectivity for CO in the RWGS reaction. In situ DRIFTS analyses revealed changes in bands associated with CO3 2 and *HCOO species, offering insights into CO2 activation and suggesting the involvement of formate-mediated pathways as responsible for CO production. (AU)

• FAPESP's process: 23/14345-1 - In situ surface science investigation of biochar/iron-based layered double hydroxides as catalysts for CO2 hydrogenation.
• Grantee: Rosembergue Gabriel Lima Goncalves
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 23/10582-9 - Tandem reactions of CO2 reduction and ethane dehydroaromatization over bifunctional zeolite/layered double hydroxide catalysts
• Grantee: Gabriel Liscia Catuzo
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 20/15230-5 - Research Centre for Greenhouse Gas Innovation - RCG2I
• Grantee: Julio Romano Meneghini
• Support Opportunities: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 21/14230-4 - Iron-based layered double hydroxides as multifunctional catalysts for CO2 hydrogenation to light olefins (C2-C4): evaluation the effect of chemical composition and porosity on catalytic performance
• Grantee: Rosembergue Gabriel Lima Goncalves
• Support Opportunities: Scholarships in Brazil - Post-Doctoral