New catalyst with multiple active sites for selective hydrogenolysis of cellulose to ethylene glycol

Abstract

Three different active sites were incorporated in 3-D silica matrix. One pot procedure was applied without using solvents or surfactants. The prepared material exhibited superior catalytic activity in the hydrogenolysis of cellulose to ethylene glycol.

Pt Islands on 3 D Nut‐like PtAg Nanocrystals for Efficient Formic Acid Oxidation Electrocatalysis

“…With respect to the mass activity,t he activity variations among these five electrocatalysts were very similar to the variations of the specific activity.A so bserved, the mass activity of PtAg 1 was calculated to be 1728.3 mA mg À1 ,w hichw as 4.0, 1.8, 1.5, and 1.2 times higher than those of commercial Pt/C (431.2 mA mg À1 ), PtAg NCs (935.5 mA mg À1 ), PtAg 0.5 (1137.5 mA mg À1 ), and PtAg 1.5 (1382.1 mA mg À1 ), respectively,i ndicating its better electrocatalytic activity toward FAOR. [24,25] As illustrated in Figure S7 A, the PtAg 1 "nuts"d isplayed the slowest current decay over time and retainedt he highest mass activity among these catalysts.…”

“…[22,23] As observed in Figure S11, PtAg 1 displayed the smallest diameter impedancea rc (DIA) among these electrocatalysts, indicating that the 3D PtAg 1 "nuts" possessed the smallest electron-transfer resistance and best electricalc onductivity,w hichw as consistentw ith their outstanding electrocatalytic performances.O ur efforts in this work clearly demonstrate that the as-obtained PtAg "nuts" showedg reatly enhanced electrocatalytic activity and reusability.T he enhanced performance of the uniform 3D PtAg "nuts"r eported herein is likely attributed to the combination of the structure and synergistic effect between Pt and Ag. [24,25]…”

Chemocatalytic Conversion of Cellulose into Key Platform Chemicals

“…Hamdy et al reported a novel 3Al-15W-3Ni catalyst prepared by one-pot hydrothermal sol-gel process for selective hydrogenolysis of cellulose into EG. The catalyst showed the multiple active sites and exhibited a high cellulose conversion (100%) and an excellent yield of EG with 76.0% at 229.85°C for 90 min under 4.0 MPa of H 2 pressure ( Table 3, entry 1) [273]. Ribeiro and coworkers synthesized a carbon nanotube-(CNT-) supported bimetallic 0.8%Ru-30%W/CNT catalyst prepared via a sequential incipient wetness impregnation method (first loaded with W and then with Ru component) for the hydrolytic hydrogenation of cellulose to EG, leading to 100% cellulose conversion and about 40% EG yield in aqueous solution at 205°C for 3 h of reaction under 5.0 MPa of H 2 pressure, which was demonstrated to be an improved catalytic performance compared with monometallic Ru/CNT or W/CNT catalyst under the same reaction conditions ( [288].…”

Solvent-free hydrogenation of cyclohexene over Rh-TUD-1 at ambient conditions

“…The synthesis was carried out by one-pot synthesis procedure based on sol-gel technique very similar to the synthesis method which was reported earlier by Hamdy and coworkers. [18][19][20] The activity of the prepared catalyst was investigated in the liquid phase, room temperature (298 K) and ambient pressure hydrogenation of cyclohexene. The stability and reusability were also investigated.…”