11156nas a2200217 45000080041000000220014000412450135000552100069001902600008002593000011002674900008002785201038200286653002410668653001810692653001810710653001010728653001910738100002110757700002210778856013810800 2021 eng d a0008-621500aElucidating the effect of solid base on the hydrogenation of C5 and C6 sugars over Pt–Sn bimetallic catalyst at room temperature0 aElucidating the effect of solid base on the hydrogenation of C5  cJUL a1083410 v5053 a

Conversion of sugars into sugar alcohols at room temperature with exceedingly high yields are achieved over Pt–Sn/γ-Al2O3 catalyst in the presence of calcined hydrotalcite. pH of the reaction mixture significantly affects the conversion and selectivity for sugar alcohols. Selection of a suitable base is the key to achieve optimum yields. Various solid bases in combination with Pt–Sn/γ-Al2O3 catalysts were evaluated for hydrogenation of sugars. Amongst all combinations, the mixture (1:1 wt/wt) of Pt–Sn/γ-Al2O3 and calcined hydrotalcite showed the best results. Hydrotalcite helps to make the pH of reaction mixture alkaline at which sugar molecules undergo ring opening. The sugar molecule in open chain form has carbonyl group which can be polarized by Sn in Pt–Sn/γ-Al2O3 and Pt facilitates the hydrogenation. In the current work, effect of both; solid base and Sn as a promoter has been studied to improve the yields of sugar alcohols from various C5 and C6 sugars at very mild reaction conditions.

10aBimetallic catalyst10aHydrogenation10aHydrotalcites10aSugar10aSugar alcohols1 aTathod, Anup, P.1 aDhepe, Paresh, L. uhttp://library.ncl.res.in/content/elucidating-effect-solid-base-hydrogenation-c5-and-c6-sugars-over-pt%E2%80%93sn-bimetallic-catalyst01844nas a2200229 4500008004100000022001400041245007500055210006900130260000800199300001100207490000800218520112400226653002201350653001801372653001101390653001601401653002901417653001601446100002101462700002201483856010901505 2021 eng d a0016-236100aUpgrading lignin derived monomers over basic supported metal catalysts0 aUpgrading lignin derived monomers over basic supported metal cat cDEC a1215880 v3063 aCatalytic upgradation of aromatic monomers derived from lignin depolymerization is of high interest for the production of sustainable fuels and chemicals. Basic support has potential to provide advantages of better substrate-support interaction and reduced coke formation. Hence, we report the effect of various basic supports for metal catalysts (Pt, Pd, Ru) on the upgradation of phenol, guaiacol and eugenol. The complete hydrogenation product is achieved due to the strong interaction of the substrate with catalyst. Phenol is converted (55%) into cyclohexanol (49% yield) with low loading of Pt catalyst (1 wt%), supported by the higher TON of 1 wt% Pt/NaX (TON = 14844) than 3 wt% Pt/NaX (TON = 5128). Effect of basic support with moderate (NaX) and strong (CHT) basic strengths are corelated for the higher cyclohexanone formation. Presence of strong basic sites and higher TON of 3 wt% C-HT (TON = 6806) directs the significant substrate-support interaction. Catalytic activity and recyclability are supported by the comparable performance of recycle runs and characterizations of the fresh and spent catalysts.10aaromatic monomers10aHydrogenation10alignin10aSolid bases10asupported metal catalyst10aUpgradation1 aChaudhary, Richa1 aDhepe, Paresh, L. uhttp://library.ncl.res.in/content/upgrading-lignin-derived-monomers-over-basic-supported-metal-catalysts