01804nas a2200241 4500008004100000022001400041245008800055210006900143260007300212300001000285490000800295520097000303653001201273653001301285653001601298653001301314653002701327100001901354700001901373700001801392700003301410856011901443 2013 eng d a1387-181100aDehydration of fructose to 5-hydroxymethyl furfural over ordered AlSBA-15 catalysts0 aDehydration of fructose to 5hydroxymethyl furfural over ordered  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV a38-460 v1813 a

5-Hydroxymethyl furfural is an important platform chemical. It is successfully synthesized from renewable carbohydrates using mesoporous AlSBA-15 catalysts under biphasic conditions. Fine tuning of the catalyst acidity is important to drive the reaction to give good yields of furan compound. Al-SBA-15 catalysts with different Si/Al ratios were prepared and characterized by XRD, Al-27 MASNMR, SEM, TEM, N-2 sorption, ICP-OES and TPD of ammonia. Results show that part of aluminium is substituted into tetrahedral positions. The catalyst with lower acid site density but medium to strong acid strength favours selective formation of HMF. Under the optimized conditions, HMF selectivity was as high as 88% at 59 mol% conversion of fructose. Leaching of part of aluminium occurs under hydrothermal conditions, if solvent mixtures containing water are used, while activity can be retained if DMSO is used as solvent. (c) 2013 Elsevier Inc. All rights reserved.

10aAcidity10aAlSBA-1510adehydration10afructose10aHydroxymethyl furfural1 aLucas, Nishita1 aKokate, Ganesh1 aNagpure, Atul1 aChilukuri, Satyanarayana, V. uhttps://library.ncl.res.in/content/dehydration-fructose-5-hydroxymethyl-furfural-over-ordered-alsba-15-catalysts-002147nas a2200265 4500008004100000022001400041245008300055210006900138260010100207300001200308490000800320520121000328653000601538653002001544653003001564653002901594653001601623653001301639100001901652700002601671700002201697700001901719700003301738856011001771 2014 eng d a0974-362600aNovel catalysts for valorization of biomass to value-added chemicals and fuels0 aNovel catalysts for valorization of biomass to valueadded chemic aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbCatalysis Soc IndiacMAR a403-4130 v1263 a

Key furan compounds such as 5-hydroxymethylfurfural (HMF), 2,5-furandicarboxylic acid (FDCA) and 2,5-dimethylfuran (DMF) were synthesized from renewable feedstocks. Dehydration of fructose was carried out in biphasic conditions employing several solid acid catalysts by targeting selective formation of HMF. Its selectivity is linearly dependent on total acidity clearly revealing that lower acidity favours selective formation of HMF. Oxidation and hydrogenolysis of HMF has been explored using 2 wt% Ru-K-OMS-2. The catalysts used for each transformation were subjected to detailed characterization using XRD, BET surface area, temperature-programmed desorption and transmission electron microscopy. The effect of various reaction parameters was also investigated for obtaining high yields of desired chemical intermediates. High FDCA yields of 93.4 mol% and 66 mol% were achieved in alkaline and base-free conditions, respectively. The 2 wt% Ru-K-OMS-2 is a versatile catalyst as it also catalyses HMF hydrogenolysis giving 33 mol% of DMF. Thus, utility of various novel materials as catalysts has been demonstrated in the multistep transformations of hexoses to furan-based fuels and chemicals.

10a210a5-dimethylfuran10a5-furan dicarboxylic acid10a5-hydroxymethyl furfural10adehydration10afructose1 aLucas, Nishita1 aKanna, Narasimha, Rao1 aNagpure, Atul, S.1 aKokate, Ganesh1 aChilukuri, Satyanarayana, V. uhttps://library.ncl.res.in/content/novel-catalysts-valorization-biomass-value-added-chemicals-and-fuels-002994nas a2200277 4500008004100000022001400041245013500055210006900190260000800259300001400267490000700281520202800288653003002316653002102346653001602367653002802383653002002411653002702431653002402458100002302482700002302505700001902528700002202547700002902569856011802598 2023 eng d a1877-264100aDirect conversion of N-acetyl-d-glucosamine to N-containing heterocyclic compounds 3-acetamidofuran and 3-acetamido-5-acetyl Furan0 aDirect conversion of Nacetyldglucosamine to Ncontaining heterocy cDEC a4201-42140 v143 a

Purpose Effectual waste utilization from plant as well as marine biomass has gained tremendous importance with reference to sustainability. The valorization of marine biomass produces value added compounds containing not only C, H, O but also renewable N atom in the skeleton which widens the scope for its exploration which may prove to be economically beneficial to the society. Heterogeneous catalytic transformation of marine biomass i.e. N-acetyl glucosamine (NAG) to N-substituted aromatic heterocyclic furan derivatives is reported for the very first time. Cost effective and stable metal oxide catalysts were deployed for the transformation. Catalyst screening study showed that La2O3 was found to be an excellent catalyst for N-acetyl glucosamine (NAG) dehydration which mainly produced 3-acetamidofuran (3AF). Methods The physicochemical properties of the metal oxide catalyst were investigated by various techniques such as XRD, FTIR, MeOH-FTIR, TPD, SEM, N-2 sorption studies and HR-TEM analysis for structure activity relationship. Results The effect of various reaction parameters such as catalyst concentration, reaction temperature, reaction time and solvent effect on dehydration of N-acetyl glucosamine has been studied in detail for higher yields. The results revealed that the presence of weak basic sites which are Bronsted in nature and nano pores present on the surface were responsible for improved dehydration of the chitin biomass to selectively yield 3-acetamidofuran (3AF). La2O3 catalyst showed optimum 50% 3AF yield from N-acetyl glucosamine at 180 degrees C in 3 h. Conclusion Efficacious exploitation of marine biomass to value added chemicals using heterogeneous catalysts can be extensively exploited. Separation of N-substituted heterocyclic aromatics is the most innovative aspect of the current study. Thus, utilization of heterogeneous catalyst and renewable biomass as a raw material indicates a transition towards more sustainable and greener approach.{GRAPHICAL ABSTRACT

10a3-acetamido-5-acetylfuran10a3-acetamidofuran10adehydration10aheterogeneous catalysis10aLanthanum oxide10aN-acetyl-D-glucosamine10arenewable feedstock1 aShaikh, Samrin, S.1 aPatil, Chetana, R.1 aLucas, Nishita1 aBokade, Vijay, V.1 aRode, Chandrashekhar, V. uhttps://library.ncl.res.in/content/direct-conversion-n-acetyl-d-glucosamine-n-containing-heterocyclic-compounds-3