The synergism of cadmium on the catalytic activity of Cd–Cr–O system

The influence of Pd loading on the physicochemical properties of the Cu–Cr–Al methanol synthesis catalysts

“…al. [19] investigated the phase composition of copper-chromium(III) catalysts and they also confirmed the formation of copper chromite spinel-like structure (CuCr 2 O 4 ) and small quantities of a-Cr 2 O 3 [20]. In our previous works [13,14,21], we obtained similar results.…”

Infrared spectroscopy of ferroelectric nanowires of antimony sulfoiodide

“…Brö nsted and Lewis sites, of transition metal oxides [56]. Thus, ethylene formation indicates the presence of higher acidic sites on the SbSI nanowires.…”

“…an electronic effect [56]. Accordingly, S À2 or I À1 can act as donor site, whereas surface coordinatively unsaturated Sb 3+ can act as electron acceptor.…”

Cu/Cr2O3·3Al2O3 and Au–Cu/Cr2O3·3Al2O3 catalysts for methanol synthesis and water gas shift reactions

“…The applied impregnation method lowered the specific surface area of bi-oxide support Cr 2 O 3 Á3Al 2 O 3 considerably from 157 to 90 m 2 /g in the case of the 20% Cu/ Cr 2 O 3 Á3Al 2 O 3 catalyst after calcination at 400°C, and to 37 m 2 /g in the case of the 5% Au-20% Cu/Cr 2 O 3 Á3Al 2 O 3 catalyst after calcination at 400°C, which can be explained by support transformation in acid solution originating from HAuCl 4 and Cu(NO 3 ) 2 taking place during impregnation step as well as by blocking of support pores by the CuO x and/or Au species.XRD analysis of copper supported catalysts 20% Cu/Cr 2 O 3 Á3Al 2 O 3 after its calcination for 4 h in air at 400°C confirmed the presence of many phases. Besides the expected mono-oxides (strongly disordered c-Al 2 O 3 , a-Cr 2 O 3 phases with low crystallinity and CuO) bi-oxide phases, copper chromite spinel-like structure CuCr 2 O 4[10][11][12] and Al 1.54 O 3 Cr 0.46…”