01297nas a2200265 4500008004100000022001400041245011300055210006900168260007300237300001200310490000800322520031500330653002100645653002000666653002700686653001800713653002400731100002300755700002500778700002200803700002600825700003100851700002300882856012600905 2007 eng d a1381-116900aTransesterification of alpha-haloesters and beta-ketoesters over Mg-Al-hydrotalcites (HT)-like anionic clays0 aTransesterification of alphahaloesters and betaketoesters over M aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT a158-1610 v2763 a

Transesterification of alpha-haloesters was achieved by reaction of alcohols in the presence of Mg-Al-HT-like anionic clays. beta-Ketoesters were also transesterified under similar conditions on reaction with alcohols with a wide variety of functional groups. (c) 2007 Elsevier B.V. All rights reserved.

10aalpha-haloesters10abeta-ketoesters10aheterogeneous catalyst10aHydrotalcites10atransesterification1 aBulbule, Vivek, J.1 aBorate, Hanumant, B.1 aMunot, Yogesh, S.1 aDeshpande, Vishnu, H.1 aSawargave, Sangmeshwer, P.1 aGaikwad, Abaji, G. uhttps://library.ncl.res.in/content/transesterification-alpha-haloesters-and-beta-ketoesters-over-mg-al-hydrotalcites-ht-001585nas a2200289 4500008004100000022001400041245011700055210006900172260011000241300001400351490000700365520056300372653001400935653001800949653001400967653002400981653001801005653001401023653002501037653002401062653001901086653000901105100001401114700002801128700001701156856012201173 2011 eng d a0376-471000aLanthanum and zinc incorporated hydrotalcites as solid base catalysts for biodiesel and biolubricants production0 aLanthanum and zinc incorporated hydrotalcites as solid base cata aDR K S KRISHNAN MARG, PUSA CAMPUS, NEW DELHI 110 012, INDIAbNATL INST SCIENCE COMMUNICATION-NISCAIRcAUG a1017-10250 v503 a

Mg-Al hydrotalcites doped with varying amounts of lanthanum and zinc ions (10 30 mol %) have been prepared by co-precipitation method and used, after calcination at 873 K, as solid base catalysts for transesterification of soybean oil with methanol (producing biodiesel) and n-octanol (producing biolubricants). The catalyst with 20 mol % of lanthanum shows the highest transesterification activity (soybean oil conversion = 100 % and biodiesel yield = 95 %) at 423 K in 4 h. Catalytic activity varies in proportion with the basicity of the catalysts.

10aBiodiesel10aBiolubricants10acatalysis10aDoped hydrotalcites10aHydrotalcites10aLanthanum10aSolid base catalysts10atransesterification10aVegetable oils10azinc1 aRahul, R.1 aSatyarthi, Jitendra, K.1 aSrinivas, D. uhttps://library.ncl.res.in/content/lanthanum-and-zinc-incorporated-hydrotalcites-solid-base-catalysts-biodiesel-and-011157nas a2200217 45000080041000000220014000412450135000552100069001902600008002593000011002674900008002785201038200286653002410668653001810692653001810710653001010728653001910738100002110757700002210778856013910800 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. uhttps://library.ncl.res.in/content/elucidating-effect-solid-base-hydrogenation-c5-and-c6-sugars-over-pt%E2%80%93sn-bimetallic-catalyst