Influence of Al, Cr, Ga, or Zr as promoters on the performance of Cu/ZnO catalyst for CO2 hydrogenation to methanol

Author(s)

Santana, Cassia S. ; Rasteiro, Leticia F. ; Marcos, Francielle C. F. ; Assaf, Elisabete M. ; Gomes, Janaina F. ; Assaf, Jose M.

• Document type: Journal article
• Source: MOLECULAR CATALYSIS; v. 528, p. 9-pg., 2022-07-18.

Abstract

Different promoters can be applied to increase the activity, selectivity, and stability of the Cu/ZnO for the CO2 hydrogenation to methanol. Herein, we investigated the effect of the promoters' addition on the physicochemical properties of the Cu/ZnO-based catalysts and their performance in the CO2 hydrogenation to methanol. A series of Cu/ZnO catalysts, Cu/ZnO/X (X = Al2O3, Cr2O3, Ga2O3, ZrO2), were prepared by a co-precipitation method and characterized by XRF, XRD, SEM, TEM, TEM-EDS, H-2-TPR, N2O passivation, and CO2-TPD. Under the explored conditions, the promoters enhanced the catalyst activity and selectivity to methanol in the CO2 hydrogenation reaction. The superior performance of the promoted materials was associated with the increase of specific surface area, metallic copper surface area, basicity, and the decrease of the size of copper oxide crystallites and particles. Among the investigated materials, Cu/ZnO/Ga2O3 (CZG) catalyst showed the best performance in terms of activity (XCO2, 200 degrees C = 5.2%) and methanol selectivity (SMeOH, 200 degrees C = 50%). (AU)

• FAPESP's process: 17/08420-0 - Multi-approaches strategies for converting CO2 to platform molecules and value-added chemicals: catalysis and electrocatalysis investigations
• Grantee: Janaina Fernandes Gomes
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Young Investigators Grants
• FAPESP's process: 17/22671-5 - Ga-Ni nanoparticles supported on porous silica for methanol synthesis from CO2 at low pressures
• Grantee: Letícia Fernanda Rasteiro
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 18/24339-0 - Synthesis of higher alcohols by the conversion of CO2 via electrocatalysis
• Grantee: Cássia Sidney Santana
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 17/05241-7 - Synthesis of C2+OH alcohols from CO2 hydrogenation in polyfunctional catalysts based on Cu, Rh and Fe
• Grantee: Cássia Sidney Santana
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 17/08293-8 - Project 14: direct synthesis of methanol from CO2
• Grantee: Francielle Candian Firmino Marcos
• Support Opportunities: Scholarships in Brazil - Post-Doctoral