CuO/ZnO Nanoparticles in a Matrix of Amorphous Silica as High‐Surface Precursors for Methanol Synthesis

Abstract

An intimate mixture of CuO/ZnO nanocrystals was prepared by an easy sol-gel synthesis (precipitation in methanol by hydroxide in the presence of a silane). The organic substituents of the silane were almost completely removed by a subsequent photochemical oxidation. The resulting amorphous SiO 2 prevented the growth of the catalytically active particles to larger crystals. The coating layer of silica can easily be penetrated by gaseous reactants, as shown by the high spe-

Towards ‘greener’ catalyst manufacture: Reduction of wastewater from the preparation of Cu/ZnO/Al2O3 methanol synthesis catalysts

“…These include the combustion of organic metal salts [17,15,18,19], mechano-thermal [20], sol-gel [21,22] and colloidal synthesis [23]. In addition, low-metal-loading catalysts have been prepared by impregnation or chemical vapour deposition of Cu and Zn precursors on high surface area supports [24][25][26][27].…”

Synthesis and characterization of CuO nanofibers, and investigation for its suitability as blocking layer in ZnO NPs based dye sensitized solar cell and as photocatalyst in organic dye degradation

“…The other approach includes fabrication of composite nanomaterials employing CuO as one of the ingredients to improve the overall catalytic activity. These configurations include CuO/TiO 2 [17], CuO/ZnO [18], CuO/X zeolite [19], etc. In this report, photodegradation of methyl orange was carried out under UV irradiation employing CuO nanofibers as the catalyst, thus completely eliminating H 2 O 2 or composite counterpart, thus paving the way for stable and affordable photocatalyst.…”

Photocatalytic hydrogen production from aqueous Na2SO3 + Na2S solution with B/CuO/ZnO under visible light irradiation

“…22) or formates, 23 as well as in the steam reforming reaction of methanol. 24 Pure ZnO is itself active, but the addition of Cu is important in promoting catalytic reactivity. 24 Cu/ZnO/Al 2 O 3 is therefore well known as an industrial catalyst for methanol synthesis.…”

“…24 Pure ZnO is itself active, but the addition of Cu is important in promoting catalytic reactivity. 24 Cu/ZnO/Al 2 O 3 is therefore well known as an industrial catalyst for methanol synthesis. [22][23][24] The self-assembled aligned Cu-doped ZnO nanoparticles have been developed for photocatalytic H 2 production from a KOH solution with H 2 S ow under visible light illumination.…”

“…24 Cu/ZnO/Al 2 O 3 is therefore well known as an industrial catalyst for methanol synthesis. [22][23][24] The self-assembled aligned Cu-doped ZnO nanoparticles have been developed for photocatalytic H 2 production from a KOH solution with H 2 S ow under visible light illumination. 25 Zheng et al have synthesized CuO/ SnO 2 nanocomposites, which exhibited higher photocatalytic H 2 production from an acetic acid solution under UV irradiation.…”