X-ray absorption spectroscopic studies from several different groups provide a consistent structural picture of methanol synthesis catalysts. Copper metal is the principal Cu species detected in all in-situ XAS studies. A small amount of Cu(II) persisted in many samples reduced below 600 K, but it appears to be catalytically irrelevant. Cu(I) was not detected in any of the in-situ XAS studies. ...

Two-component reaction of 2-aminobenzophenones with acetylenic esters in the presence of γ-Al2O3 and Cu/ZnO as suitable heterogeneous catalysts has been studied. Nano γ-Al2O3 and Cu/ZnO showed high activities when used as surface catalysts for the synthesis of quinoline derivatives. After completion of the reaction, the catalyst was ...

We investigated the orientation and morphology of Cu nanoparticles grown under ultrahigh-vacuum conditions on ZnO(0001), ZnO(0001̅), ZnO(101̅4) single crystal surfaces by scanning tunneling microscopy, high-energy grazing incidence X-ray diffraction, low-energy electron microscopy. The (111) oriented NPs basal ZnO showed only small area fractions high indexed Cu(225) Cu(331) facets. show alignmen...

Cuprous oxide agglomerates composed of 4-10 nm Cu2O nanoparticles were deposited on multiwalled carbon nanotubes (MWCNTs) and on ZnO/MWCNTs to give binary [Cu2O/MWCNT] and ternary [Cu2O/ZnO/MWCNT] composites. Di-aqua-bis[2-(methoxyimino)propanoato]copper Cu[O2CCCH3NOMe](2)·2H2O 1 in DMF was used as single source precursor for the deposition of nanoscaled Cu2O. The precursor decomposes either in...

The development of active catalysts for carbon dioxide (CO2) hydrogenation to methanol is intimately related the creation effective metal-oxide interfaces. In this work, we investigated how order addition copper and zinc on zirconia influences catalytic properties, activity selectivity toward methanol. Regarding conversion production, which promoter (zinc) was atomically deposited after impregn...

A pure ZnO sample and a sample containing 3 mol% Al were prepared by (co)-precipitation as model materials for the oxidic support phase in Cu/ZnO/Al(2)O(3) methanol synthesis catalysts. The samples were characterized with respect to their crystal, defect and micro-structure using various methods (XRD, TEM, XPS, UV-vis spectroscopy, EPR, NMR). It was found that a significant fraction of the Al i...

The roles of CO and CO2 in Cu-catalyzed methanol synthesis from syngas were evaluated experiments with gas switching between CO/H2 CO2/H2 feeds a CO2/CO/H2 feed corresponding CO-free CO2/inert/H2 feed. Switching CO/Ar/H2 (3/29/68) CO2/N2/H2 for Cu/Al2O3 showed that the rate on Cu is more than an order magnitude higher compared to CO. Experiments at low conversion conditions negligible product f...

Photoreduction of CO2 with water into valuable organic compounds under concentrated sunlight as well as Xeor Hg-lamp irradiation was investigated using a Pt-loaded potassium hexatitanate (K2Ti6O13) photocatalyst or a composite catalyst in which the Pt-K2Ti6O13 photocatalyst was combined with a CO2 hydrogenation catalyst of Cu/ZnO. When the Pt-K2Ti6O13 photocatalyst was used under Xeor Hg-lamp i...