01970nas a2200241   4500008004100000022001400041245013700055210006900192260000800261300001600269490000600285520111900291653002101410653001301431653001201444653001801456653002201474100002301496700002301519700002501542700002901567856013201596       2020                        eng d  a2365-654900aCooperative acid-base sites of solid Ba-Zr mixed oxide catalyst for efficient isomerization of glucose to fructose in aqueous medium0 aCooperative acidbase sites of solid BaZr mixed oxide catalyst fo  cOCT  a12505-125130 v53 a<p>Efficient and highly selective isomerization of glucose to fructose was achieved by using the inexpensive Ba-Zr mixed metal oxide catalyst. Catalyst was prepared by varying Ba-Zr ratios using co-precipitation method. Various phases formed, planes exposed, morphology, elemental composition and particle size, basic site density and strength, oxidation state of elements were well studied by using various characterization techniques. The XRD analysis clearly indicates the presence of Ba+2 and Zr+4 in the form of BaO, ZrO2 and BaZrO3 phases. The SEM and HR-TEM images indicate that, Ba-Zr (2 : 1) catalyst prepared showed uniform morphology with spherical and rod-shaped particles ranging from 300 to 600 nm. Under the optimized reaction conditions Ba-Zr (2 : 1) catalyst exhibited excellent results in terms of 57 % of glucose conversion with 89 % selective formation of glucose. The presence of both acidic as well as basic sites play vital roles in activating the substrate molecules to selectively yield fructose. Ba-Zr (2 : 1) catalyst showed excellent recyclability performance up to four recycles.</p>
10aCo-precipitation10afructose10aglucose10aisomerization10amixed metal oxide1 aShaikh, Samrin, S.1 aPatil, Chetana, R.1 aKondawar, Sharda, E.1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/cooperative-acid-base-sites-solid-ba-zr-mixed-oxide-catalyst-efficient-isomerization-glucose02994nas 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