Efficient CO₂catalytic hydrogenation over CuO_x–ZnO/silicalite-1 with stable Cu⁺species

Abstract

Cu-based/SiO2 nanocatalysts with Cu0 or Cu+ species as active sites have been widely investigated for CO2 hydrogenation. Here, 10CuO/silicalite-1(S-1) and 10CuO-2ZnO/S-1 catalysts were cheap prepared by wet impregnation. 7.5% conversion...

Effects of metal size on supported catalysts for CO2 hydrogenation

“…In addition, the production of oxidized Cu species (Cu 2+ , Cu + , and Cu d+ ) profits from the reduction in Cu size and these oxidized Cu species are thought to be the active sites of methanol production. 24,[57][58][59] Zhou et al found that silica-loaded Cu/ Mo 2 CT x (MXene) catalysts exhibited higher intrinsic methanol production per unit mass of copper than Cu/SiO 2 catalysts with similar copper loading because partial Cu species can migrate to the Mo 2 CT x surface in an atomic-dispersion of Cu d+ , forming silica-loaded Cu/Mo 2 CT x catalysts. 56 The Cu/Mo 2 CT x interface on Cu sites with Lewis acidity is responsible for the enhanced methanol production rate (Fig.…”

Dehydrogenation of Diethylene Glycol to Para-Dioxanone over Cu/SiO2 Catalyst: Effect of Structural and Surface Properties

“…In order to further clarify the relative proportions of Cu 0 and Cu + in catalysts with different structures after reduction, the Auger spectra of Cu LMM were collected; Figure 8 shows the results. The spectra were first deconvoluted to two peaks locating at 916.4 eV and 918.5 eV, which were ascribed to the signals of Cu + and Cu 0 species, respectively [20,[24][25][26]. The integration of peak area showed that the ratio of Cu + /(Cu + +Cu 0 ) in reduced CuSi-ae, 65.97%, was evidently higher than 40.42% of Cu + /(Cu + +Cu 0 ) in reduced CuSi-dp.…”