02013nas a2200157 4500008004100000245014500041210007000186260000800256300002300264490000600287520136100293100001801654700002201672700002401694856013701718 2020 eng d00aHighly active Brønsted acidic silicon phosphate catalyst for direct conversion of glucose to levulinic acid in MIBK–water biphasic system0 aHighly active Brønsted acidic silicon phosphate catalyst for dir cJAN aArticle number: 510 v23 a

Due to depletion of fossil fuel reserves and environmental concerns demand the utilization of other renewable feedstocks such as biomass which is available abundantly in different quantities throughout the world. Catalytic transformation of this biomass or biomass-derived products such as glucose to valuable platform biochemicals viz: levulinic acid (LA) is academically as well as industrially important reaction. In the present work, Silicon phosphates (SixPO4) catalysts viz: Si10PO4, Si20PO4, Si30PO4, and Si40PO4 having solely Brønsted acidic properties were prepared by wet impregnation of H3PO4 (10–40 wt%) on fumed silica followed by calcination at 550 °C for 10 h. The prepared catalysts were characterized by various techniques such as XRD; NH3-TPD; FTIR etc. Formation of silicon phosphate structure was found to depend on % of P loading and its interaction with silica. The acidic property of SixPO4 catalyst was characterized by NH3-TPD and Pyridine-IR, confirmed that catalyst has exclusively strong Brønsted acidity. A high LA yield of 81 mol% over Si30PO4 has achieved at an optimized reaction condition of 140 °C; 10 h in MIBK–water (9:1) biphasic system.

1 aBokade, Vijay1 aMoondra, Hitakshi1 aNiphadkar, Prashant uhttps://library.ncl.res.in/content/highly-active-br%C3%B8nsted-acidic-silicon-phosphate-catalyst-direct-conversion-glucose-levulinic01435nas a2200241 4500008004100000022001400041245013200055210006900187260000800256300001100264490000800275520062700283653001200910653002100922653001000943653001500953653001600968100001900984700002401003700002101027700001801048856012701066 2020 eng d a1387-181100aHighly efficient micro-meso acidic H-USY catalyst for one step conversion of wheat straw to ethyl levulinate (biofuel additive)0 aHighly efficient micromeso acidic HUSY catalyst for one step con cOCT a1104740 v3063 a

Ethyl Levulinate (EL), biofuel additive can blend up to 20% with biodiesel to improve its fuel properties. Till the date, there are reports on homogeneous catalysts (H2SO4, ionic liquid) for synthesis of EL from raw biomass like wheat straw. To best of our knowledge, there is no single report on heterogeneous catalyst for one step synthesis of EL directly from wheat straw. This work is a successful attempt to use heterogeneous micro-meso acidic H-USY (post dealumination and desilication) for direct one step conversion of wheat straw to EL with higher EL yield 24.5 wt%, which is probably the highest so far.

10aAcidity10aethyl levulinate10aH-USY10aMicro-meso10aWheat straw1 aHeda, Jidnyasa1 aNiphadkar, Prashant1 aMudliar, Sandeep1 aBokade, Vijay uhttps://library.ncl.res.in/content/highly-efficient-micro-meso-acidic-h-usy-catalyst-one-step-conversion-wheat-straw-ethyl02041nas a2200229 4500008004100000022001400041245017900055210006900234260000800303300001100311490000700322520120100329653000901530653002201539653002901561653002301590653000901613100001701622700002401639700001801663856013001681 2022 eng d a1944-744200aHierarchical TS-1 for epoxidation of non-edible Karanja (Millettia pinnata) oil methyl ester to methyl epoxioleate (biodiesel additive) in presence of H2O2 as oxidizing agent0 aHierarchical TS1 for epoxidation of nonedible Karanja Millettia  cMAY ae137660 v413 a

Application of non-edible Karanja (Millettia pinnata) oil which is abundantly available in India is not explored so far. The present study is an attempt to convert fatty acid methyl ester (FAME) obtained from Karanja oil to methyl epoxioleate over hierarchical titanosilicate (TS-1) catalyst. Methyl epoxioleate, a biodiesel additive can blend up to 20% with biodiesels to improve oxidative stability and cold flow properties of biodiesel. A series of hierarchical TS-1 were prepared by desilication of parent TS-1 with 0.1 N NaOH at 80 degrees C for 1, 3, 5, and 7 h, respectively. Samples were characterized by powder XRD, low temperature nitrogen adsorption/desorption, and TEM. Eighty percent FAME conversion with 70% yield of methyl epoxioleate was obtained over 5H-TS-1 catalyst. The enhanced catalytic activity of a 5H-TS-1 compared to parent TS-1 mainly attributed to the high mesoporosity coupled with well-preserved crystallinity. 5H-TS-1 catalyst was found to be completely reusable after calcination at 500 degrees C for 12 h. Hierarchical 5H-TS-1 catalyst for effective conversion of non-edible Karanja oil methyl ester to methyl epoxioleate probably not reported so far.

10aH2O210ahierarchical TS-110aKaranja oil methyl ester10amethyl epoxioleate10aTS-11 aAnil, Reshma1 aNiphadkar, Prashant1 aBokade, Vijay uhttps://library.ncl.res.in/content/hierarchical-ts-1-epoxidation-non-edible-karanja-millettia-pinnata-oil-methyl-ester-methyl