Synergetic effect of metal–support for enhanced performance of the Cu–ZnO–ZrO₂/UGSO catalyst for CO₂hydrogenation to methanol

Abstract

Novel Cu–ZnO–ZrO2/UGSO catalysts for CO2 hydrogenation to methanol were developed using a metallurgical residue as catalytic support, focusing on (i) the synergy of Cu/Zn/Zr and UGSO composition and (ii) UGSO modification, on catalytic activity and stability.

New Insights on Catalytic Valorization of Carbon Dioxide by Conventional and Intensified Processes

“…Structural modifications of the support can also be beneficial to increase CO 2 conversion as demonstrated in a recent work by Vu et al where the UGSO support was treated with H 2 O 2 prior to the addition of the active phase (Cu/ZnO/Zr). This modification led to a 57% higher methanol yield (240 °C/20 bar) compared to a commercial Cu–Zn catalyst which was attributable to a significant increase of the support surface area and pore volume …”

“…Methanol production from CO 2 hydrogenation (Reaction ) is the result of an exothermic reaction that is thermodynamically favored at lower temperatures compared to the RWGS reaction, although these reactions compete with one another in the reaction environment. ,− normalC normalO 2 + 3 normalH 2 ⇔ normalC normalH 3 normalO normalH + normalH 2 normalO goodbreak0em1em⁣ normalΔ H = prefix− 49.2 .25em normalk normalJ / normalm normalo normall normalC normalO + 2 normalH 2 ⇔ normalC normalH 3 normalO normalH goodbreak0em1em⁣ normalΔ H = prefix− 90.4 .25em normalk normalJ / normalm normalo normall Methanol synthesis can also occur through the hydrogenation of CO (Reaction ), which could originate from the RWGS reaction as an intermediate step . However, the conversion of CO 2 into methanol through this pathway is actually very limited .…”

“…As seen in Table , copper has been often employed as an active metal for methanol production from CO 2 hydrogenation. ,,,,,,, As introduced earlier, Cu-based catalysts are far more prone to sintering than Fe-based ones, which limits their utilization at high temperatures in the RWGS process, yet they are well suited for methanol synthesis favored by lower operating temperatures (usually below 400 °C). To improve their performance, Cu-based catalysts can be modified by the addition of several suitable promoters (e.g., ZnO, , In 2 O 3 ).…”

“…Methanol production from CO 2 hydrogenation (Reaction ) is the result of an exothermic reaction that is thermodynamically favored at lower temperatures compared to the RWGS reaction, although these reactions compete with one another in the reaction environment. ,− Methanol synthesis can also occur through the hydrogenation of CO (Reaction ), which could originate from the RWGS reaction as an intermediate step . However, the conversion of CO 2 into methanol through this pathway is actually very limited .…”

“…This modification led to a 57% higher methanol yield (240 °C/20 bar) compared to a commercial Cu−Zn catalyst which was attributable to a significant increase of the support surface area and pore volume. 126 In a very recent article, Daifeng et al investigated the interactions between a Co 3 O 4 active phase and a In 2 O 3 support, prepared in the presence of bamboo powder. 128 They observed that the addition of bamboo powder during synthesis led to the formation of amorphous Co 0 due to interactions between Co 3 O 4 and In 2 O 3 , inducing oxygen vacancies in the In 2 O 3 support.…”