01805nas a2200169 4500008004100000022001400041245010500055210006900160260000800229300001400237490000600251520118100257100002501438700002901463700002001492856012301512 2022 eng d a2398-490200aCatalytic conversion of sucrose to 1,2-propanediol over alumina-supported Ni-Mo bimetallic catalysts0 aCatalytic conversion of sucrose to 12propanediol over aluminasup cJUL a3681-36890 v63 a

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.

1 aSreekantan, Sreejith1 aKirali, Arun, Arunima Ba1 aMarimuthu, Banu uhttps://library.ncl.res.in/content/catalytic-conversion-sucrose-12-propanediol-over-alumina-supported-ni-mo-bimetallic01529nas a2200241 4500008004100000022001400041245012700055210006900182260000800251300001100259490000800270520068800278653002200966653000900988653001900997653002001016653001801036653002701054100002901081700002501110700002001135856013201155 2022 eng d a1566-736700aCe promoted Cu/?-Al2O3 catalysts for the enhanced selectivity of 1,2-pro-panediol from catalytic hydrogenolysis of glucose0 aCe promoted CuAl2O3 catalysts for the enhanced selectivity of 12 cMAY a1064470 v1653 a

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.

10a2-Propanediol

10a

110aCu-Ce catalyst10aethylene glycol10aGamma alumina10aGlucose hydrogenolysis1 aKirali, Arun, Arunima Ba1 aSreekantan, Sreejith1 aMarimuthu, Banu uhttps://library.ncl.res.in/content/ce-promoted-cu-al2o3-catalysts-enhanced-selectivity-12-pro-panediol-catalytic-hydrogenolysis01669nas a2200253 4500008004100000245009700041210006900138260000800207300000900215490000700224520088900231653000901120653001501129653001301144653002301157653000701180653001101187653000601198100002101204700002501225700002001250700002101270856012401291 2022 eng d00aC-O hydrogenolysis of C3-C4 polyols selectively to terminal diols over Pt/W/SBA-15 catalysts0 aCO hydrogenolysis of C3C4 polyols selectively to terminal diols  cSEP a10700 v123 a

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.

10adiol10aErythritol10aGlycerol10aHydrodeoxygenation10aPt10aSBA-1510aW1 aBhowmik, Susmita1 aEnjamuri, Nagasuresh1 aMarimuthu, Banu1 aDarbha, Srinivas uhttps://library.ncl.res.in/content/c-o-hydrogenolysis-c3-c4-polyols-selectively-terminal-diols-over-ptwsba-15-catalysts