Stable Cu 8+species- Catalyzed CO 2 hydrogenation to methanol in silanol nests on Cu/S-1 catalyst

Fine -regulating the electronic state of metal species to enhance the catalytic activity has demonstrated to be an effective yet persistent challenge. The study introduces an innovative method for enhancing catalytic performance in hydrogenating CO 2 to methanol via modulating copper -support interactions through the adjustment of surface silanol groups. The developed Cu/S-1 catalyst exhibits outstanding results: 85% methanol selectivity and 8.0% CO 2 conversion under 240 degrees C and 3 MPa, while maintaining stability for over 200 h. This performance surpasses that of the Cu/SiO 2 catalyst. Analyses indicate that the higher presence of Cu 8+ species in Cu/S-1 is attributed to the silanol nests in S-1 zeolite, which can stabilize these species and prevent the further reduction. The study identifies Cu 8+ and Cu 0 as active species for CH 3 OH and CO production, respectively. A higher Cu 8+ / Cu 0 ratio eventuates better CO 2 conversion and CH 3 OH selectivity. Copper -support interaction is a key to the exceptional stability of the catalyst.