@article {48023, title = {Catalytic conversion of sucrose to 1,2-propanediol over alumina-supported Ni-Mo bimetallic catalysts}, journal = {Sustainable Energy \& Fuels}, volume = {6}, year = {2022}, month = {JUL}, pages = {3681-3689}, type = {Article}, abstract = {

Ni-Mo supported on gamma-Al2O3 catalysts were synthesized to test its catalytic activity towards sucrose to 1,2-propanediol (1,2-PDO) conversion. The catalyst system was characterized using various physicochemical methods, including XRD, BET, py-FTIR, XPS, FE-SEM, HR-TEM and ICP. The metal combination of 8\%Ni-20\%Mo/gamma-Al2O3 is found to be effective in producing a good yield of 1,2-propanediol (similar to 74\%) under mild reaction conditions of 180 degrees C, 40 bar H-2 pressure and a run time of 4.5 h in a batch reaction. The activity of the active catalyst over various substrates such as cellulose, glucose, fructose and real-source biomass has also been investigated. XPS analysis of the active catalyst confirms the various oxidation states of the metals Ni and Mo in the active catalyst. The py-IR results show that the optimum Lewis to Bronsted acidic site ratio is responsible for the selective conversion of sucrose to 1,2-PDO. The presence of interparticle mesopores on gamma-Al2O3 helps in the high conversion of sucrose. Furthermore, the catalyst has been found reusable for four consecutive runs without any structural or morphological changes.

}, issn = {2398-4902}, doi = {10.1039/d2se00610c}, author = {Sreekantan, Sreejith and Kirali, Arun Arunima Balachandran and Marimuthu, Banu} } @article {48038, title = {Ce promoted Cu/?-Al2O3 catalysts for the enhanced selectivity of 1,2-pro-panediol from catalytic hydrogenolysis of glucose}, journal = {Catalysis Communications}, volume = {165}, year = {2022}, month = {MAY}, pages = {106447}, type = {Article}, abstract = {

Ce promoted Cu/gamma-Al2O3 catalysts were prepared with varying amounts of Cu (x = 0-10 wt\%) and Ce (y = 0-15 wt\%). The prepared catalysts were characterized and tested for the conversion of aqueous glucose (5 wt\%) to 1,2propanediol in a batch reactor. 10\%Ce-8\%Cu/gamma-Al2O3 \& nbsp;showed the complete conversion of glucose with 62.7\% selectivity of 1,2-propanediol and total glycols (1,2-propanediol, ethylene glycol \& 1,2-butanediol) of 81\% at milder reaction conditions. Cu facilitated the hydrogenation activity and Ce loading optimize the acid/base sites of Cu/gamma-Al2O3 which obtain high selectivity of 1, 2-propanediol. Catalyst reusability is reported.

}, keywords = {2-Propanediol

,

1, Cu-Ce catalyst, ethylene glycol, Gamma alumina, Glucose hydrogenolysis}, issn = {1566-7367}, doi = {10.1016/j.catcom.2022.106447}, author = {Kirali, Arun Arunima Balachandran and Sreekantan, Sreejith and Marimuthu, Banu} } @article {48020, title = {C-O hydrogenolysis of C3-C4 polyols selectively to terminal diols over Pt/W/SBA-15 catalysts}, journal = {Catalysts}, volume = {12}, year = {2022}, month = {SEP}, pages = {1070}, type = {Article}, abstract = {

Pt/W/SBA-15 catalysts (with Pt-loading = 0.5-4 wt\% and W-loading = 1 wt\%) prepared by the sequential impregnation method were evaluated for selective C-O cleavage of erythritol and glycerol in an aqueous medium. The Pt and W particles dispersed on SBA-15 approached close proximity at higher Pt loadings and afforded synergistic enhancement in C-O hydrogenolysis activity/selectivity. 1,4-Butanediol yields of 30.9\% (at 190 degrees C, 50 bar H-2 and 24 h) and 1,3-propanediol yields of 34.4\% (at 190 degrees C, 50 bar H-2 and 12 h of reaction) were obtained over these catalysts. Pt nanoparticles (facilitating dissociative H-2 adsorption and spillover) and W (present as acidic oligomeric WOx species; activating and coordinating the polyol via 1 degrees-OH group) worked in tandem for the selective hydrogenolysis of polyols yielding terminal diols of industrial demand.

}, keywords = {diol, Erythritol, Glycerol, Hydrodeoxygenation, Pt, SBA-15, W}, doi = {10.3390/catal12091070}, author = {Bhowmik, Susmita and Enjamuri, Nagasuresh and Marimuthu, Banu and Darbha, Srinivas} }