02036nas a2200217   4500008004100000022001400041245009500055210006900150260007300219300001200292490000700304520125700311653001601568653001601584653001801600653001301618653001901631100002201650700002401672856012201696       2011                        eng d  a0169-131700aHeteropolyacid supported on montmorillonite catalyst for dehydration of dilute bio-ethanol0 aHeteropolyacid supported on montmorillonite catalyst for dehydra  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG  a263-2710 v533 a<p>Vapour phase dehydration of dilute bio-ethanol (EtOH) to ethylene (E) and diethyl ether (DEE) is industrially relevant. Ethylene is an important raw material for many petrochemical products and Diethyl ether (DEE) can be used as an alternative fuel. The efficacy of montmorillonite (K-10) and dodecatungestophosphoric acid (DTPA) supported on montmorillonite (DTPA/K-10), has been evaluated in the current work in the dehydration of dilute bio-ethanol (80%m/m). The dehydration of ethanol and cracking of diethyl ether were studied independently. 30% m/m DTPA/K-10 was found to be more active with 74% ethanol conversion and 92% ethylene selectivity at 250 degrees C in comparison with other acid catalysts used. The merit of the process lies in its use of dilute bio-ethanol, a new avenue for ethylene production from a non-petroleum feedstock. Kinetic interpretation has been made by studying the important process parameters by using 30%m/m DTPA/montmorillonite as the catalyst. The mechanism of the dehydration of ethanol reaction suggests that two types of sites are responsible. The dehydration of ethanol and cracking of diethyl ether are second order reactions with weak adsorption of species. (C) 2011 Elsevier B.V. All rights reserved.</p>10aBio-ethanol10adehydration10aDiethyl ether10aEthylene10aHeteropolyacid1 aBokade, Vijay, V.1 aYadav, Ganapati, D.  uhttps://library.ncl.res.in/content/heteropolyacid-supported-montmorillonite-catalyst-dehydration-dilute-bio-ethanol-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<p>
	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</p>
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