Effect of mesoporous silica topology on the formation of active sites in copper supported catalysts for methanol decomposition

Selective oxidation of benzyl alcohol through eco-friendly processes using mesoporous V-MCM-41, Fe-MCM-41 and Co-MCM-41 materials

“…According to a previous report [54], nm indicating that the applied synthesis method results in a high incorporation of Fe in the structure as isolated ions. It is noteworthy that this material shows no absorption at wavelengths higher than 450 nm indicating the absence of large iron oxide nanoparticles [65,66]. This is in concordance to that observed by high angle XRD evidencing the refining effect of the hydrothermal treatment on the Fe species formed in the structure [67].…”

Hydrogenolysis of glycerol to 1,2-propanediol on copper core-porous silica shell-nanoparticles

“…Without externally added hydrogen, the major sources for hydrogenation generation is due to the decomposition of methanol (solvent) on copper surface to produce hydrogen (CH 3 OH = CO + 2H 2 ), the amount of methanol decomposition was about 10% at 200°C. Silica supported copper catalysts have been studied for catalyzing methanol decomposition to produce hydrogen [33].…”

Enhancement of the dispersion and catalytic performances of copper in the hydrogenation of cinnamaldehyde by incorporation of aluminium into mesoporous SBA-15 silica

“…Populations of large copper NPs, with low dispersion, poor catalytic activity and poor stability, are usually reported in the final catalysts. [2][3][4][5][6][7][8][9][10] Several strategies have been tested to stabilize copper nanoparticles (NPs) at sizes below 10 nm in mesostructured silicas: thermal treatments carried out at low pressures, 11,12 modification of silicas by APTES grafting, 2,[13][14][15] impregnation using organic solvents 16 or organometallic complexes, 17 procedures based on self-induced assembly 18 or deposition-precipitation, 2,[19][20][21][22] and decomposition of inorganic precursors by autocombustion. 23 When standard impregnation procedures are used, it has been shown that the addition of second metals to copper (e.g., Ni, Cr), [24][25][26][27] or the functionalization 28,29 or pore occlusion of the mesostructured silica support by surfactants, 27,30 promote copper dispersion, with a resulting increase of catalytic activity in the hydrogenation of cinnamaldehyde.…”