Co-Cr composite oxides efficiently catalyzed transfer hydrogenation of α, β-unsaturated aldehydes via N-doped carbon and interfacial electron migration

Cow Dung-Based Biochar Materials Prepared via Mixed Base and Its Application in the Removal of Organic Pollutants

“…XPS was performed to examine the surface chemistry and electronic state of the molecular of BMCDs. Like many biochars [ 32 , 33 , 34 ], BMCDs also contain mainly C, O, and N elements ( Figure 4 ). The high-resolution C1s spectrum of the BMCDs showed four peaks, with the typical peaks at 283.91–284.15 eV corresponding to C-C, 285.23–285.69 eV corresponding to C-O, 286.82 eV corresponding to C=O, and 288.20 eV corresponding to O-C=C [ 25 , 26 ].…”

“…The high-resolution O1s spectrum of the BMCDs showed three peaks, with the typical peaks at 530.42 eV corresponding to quinones, 531.38 eV corresponding to C=O, 532.10–532.68 eV corresponding to C-O, and 534.13–534.79 eV corresponding to O-H [ 25 , 26 ]. The high-resolution N1s spectrum of the BMCDs showed two peaks, with the typical peaks at 398.08–399.52 eV corresponding to pyridinic-N and 400.10–400.95 eV corresponding to pyrrolic-N [ 33 ]. Moreover, interestingly, these functional groups are not significantly different despite the differences, which indicates that MB and its constituent single base do not significantly change their functional groups during activation.…”

Co–Fe catalyst supported on acidified bentonite for selective hydrogenation of cinnamaldehyde

“…The unsaturated metal sites of the catalyst serve as powerful Lewis acid sites, facilitating >CO adsorption by selectively adsorbing lone electron pairs containing oxygen. 1,12,14 The superior catalytic performance of Co-Fe/ACBT may stem from acidification exposing strong Lewis acidic sites on the ACBT surface, enhancing the hydrogenation selectivity to >CO.…”

“…Its cell structure is an aluminum-oxygen octahedron sandwiched between two silica-oxygen tetrahedra, and there are abundant cations with the capacity for ion exchange between the interlayers. The surface acidity of the support significantly affects the hydrogenation selectivity of CAL, and a catalyst with Lewis acidic sites is more favorable for producing COL. 1,[12][13][14] Bentonite as a basic support can be converted to acidified bentonite (ACBT) by acidification, 15 which is a potential strategy to facilitate >CO hydrogenation. The acid treatment modified the Si-O and Al-O structures of bentonite mainly by reacting with hydrogen to form M-OH and M δ+ (M = Si and Al).…”

Construction of intimate Lewis acid and basic sites on an Al2O3–NC composite catalyst with enhanced performance in transfer hydrogenation of cinnamaldehyde

“…The XRD patterns of x-Al [36][37][38] The bands at 3300-3500 cm −1 are assigned to N-H stretching vibrations associated with NH or -NH 2 functional groups. 37 The band at 3110 cm −1 corresponds to the O-H stretching vibration.…”