xOy–Al2O3 (M?=?Ba, Mg, K or La) oxide and the catalytic performance in the glycerol conversion from adsorption microcalorimetry characterization]]>

摘要

Abstract The synthesis of CuO species highly dispersed in MxOy–Al2O3 (M?=?Ba, Mg, K or La) basic supports was studied, and the catalytic proprieties of the solids in glycerol conversion to bioproducts were subsequently evaluated. A correlation between the copper oxide/catalytic support structure, specific surface area/porosity and the basicity (strength and amount of basic sites) of MxOy–Al2O3 (M?=?Ba, Mg, K or La) supports were observed through the following characterization techniques: XRD (structure), N2 adsorption/desorption isotherms (surface area/porosity) and microcalorimetry of CO2 adsorption (basicity). The XRD results of the different supports indicated that the basic species (BaO, MgO, K2O or La2O3) are highly dispersed in the Al2O3 matrix. The XRD patterns of the Ba and K-containing solids combined with copper present a CuO and Al2O3 formation; however, an isolated CuO phase for the Mg and La-based catalysts is not observed, demonstrating that Cu species are highly dispersed in basic support. N2 physisorption isotherms ascribed that most of the samples are mesoporous with a surface area between 26 and 178?m2?g?1, depending on the solid composition. Microcalorimetry of CO2 adsorption presented the following basic strength using the first points of the adsorption heat: 10MgAl??10LaAl??10KAl??10BaAl for the sample without copper and 5CuMgAl??5CuKAl??5CuLaAl??5CuBaAl for the materials wit