Methanol synthesis from CO2 hydrogenation over copper catalysts supported on MgO-modified TiO2

Selective Hydrogenation of CO2 to CH3OH on Supported Cu Nanoparticles Promoted by Isolated TiIV Surface Sites on SiO2

“…The most prominent catalysts for selective CO 2 hydrogenation to CH 3 OH are Cu-based, although their activity and CH 3 OH selectivityd ramatically depend on the oxide support. [9] In fact, Cu nanoparticles supported on SiO 2 decorated with isolated Zr IV sites show CO 2 hydrogenationa ctivity andC H 3 OH selectivity nearly identicalt ot hose for Cu/ZrO 2 , [13] underscoring the importance of these Lewis acid sites at the periphery of Cu nanoparticles for the selective hydrogenation of CO 2 to CH 3 OH.In contrast, Cu/TiO 2 has been observed to be av ery poor CO 2 hydrogenation catalystw ith low reaction rates and low CH 3 OH selectivity, [7,8,14] in spiteo ft he ability of Ti IV metal cen- [a] Dr. [9][10][11][12] Whereas SiO 2 can be considered as an inert support for the Cu nanoparticles that catalyzet he reaction, ZrO 2 provides Zr IV sites interfacing Cu nanoparticles that act as Lewis acid sites andp romote CH 3 OH synthesis.…”

“…[9][10][11][12] Whereas SiO 2 can be considered as an inert support for the Cu nanoparticles that catalyzet he reaction, ZrO 2 provides Zr IV sites interfacing Cu nanoparticles that act as Lewis acid sites andp romote CH 3 OH synthesis. [9] In fact, Cu nanoparticles supported on SiO 2 decorated with isolated Zr IV sites show CO 2 hydrogenationa ctivity andC H 3 OH selectivity nearly identicalt ot hose for Cu/ZrO 2 , [13] underscoring the importance of these Lewis acid sites at the periphery of Cu nanoparticles for the selective hydrogenation of CO 2 to CH 3 OH.In contrast, Cu/TiO 2 has been observed to be av ery poor CO 2 hydrogenation catalystw ith low reaction rates and low CH 3 OH selectivity, [7,8,14] in spiteo ft he ability of Ti IV metal cen- [a] Dr.…”

“…In contrast, Cu/TiO 2 has been observed to be av ery poor CO 2 hydrogenation catalystw ith low reaction rates and low CH 3 OH selectivity, [7,8,14] in spiteo ft he ability of Ti IV metal cen- [a] Dr.…”

Enhanced CH3OH selectivity in CO2 hydrogenation using Cu-based catalysts generated via SOMC from GaIII single-sites

“…34 The outstanding activity and CH 3 OH selectivity of copper supported on silica containing Ti IV isolated sites is particularly noteworthy, considering that Cu/TiO 2 performs very poorly in CH 3 OH synthesis by favoring CO formation. [36][37][38][39] This difference of catalyst performance has been ascribed to the site isolation of Ti IV and the use of a non-reducible support, SiO 2 , thus allowing Ti IV to play exclusively the role of a Lewis acid, that stabilizes reaction intermediates at the interface with Cu particles. 35 Using a similar approach, i.e., the treatment under H 2 of a graed platinum(II) molecular precursor on isolated Ga III sites generates small and narrowly distributed PtGa x nanoparticles stabilized by remaining Ga III sites that show high activity, selectivity and stability for propane dehydrogenation.…”

Synthesis of Cu–Mg/ZnO catalysts and catalysis in dimethyl oxalate hydrogenation to ethylene glycol: enhanced catalytic behavior in the presence of a Mg2+ dopant

“…59 As a result, the increase in the Cu-ZnO interface area and enhanced affinity for the electrons of the Zn-Mg solid solution with an increase in the amount of Mg 2+ dopant incorporated promotes an increase in surface Cu + formation, which is in accordance with previous reports. 26,60,61 Furthermore, both the increased Cu-ZnO interface area and enhanced affinity for the electrons of the Zn-Mg substrate tend to strengthen the MSI, which can induce the reduction of surface Cu 2+ species, as evidenced by the H 2 -TPR proles (Fig. 6).…”