Verma, Deepak Insyani, Rizki Suh, Young-Woong Kim, Seung Min Kim, Seok Ki Kim, Jaehoon 2024-01-20T01:33:57Z 2024-01-20T01:33:57Z 2021-09-01 2017-04-21 1463-9262 https://pubs.kist.re.kr/handle/201004/122836 For realizing sustainable bio-based refineries, it is crucial to obtain high yields of value-added chemicals via the direct conversion of cellulose and lignocellulosic biomass. Although the conversion of cellulose using homogeneous catalysts has been demonstrated to be quite successful, low cellulose conversion and poor product selectivity have been observed using heterogeneous catalysts. In this study, for the first time, the efficient conversion of cellulose to lactic acid derivatives, which can be used as a green solvent and a potential precursor for fine chemicals and biodegradable polymers, over a Ga-doped Zn/H-nanozeolite Y (Ga-doped Zn/HNZY) catalyst is described. Under optimized conditions at 280 degrees C in supercritical methanol, methyl lactate (ML) and methyl 2-methoxypropionate (MMP) are obtained in yields of 57.8% and 12.8%, respectively, from cellulose; these values are greater than those reported in previous studies conducted using heterogeneous catalysts. Using oakwood, ML and MMP are obtained in yields of 12.3% and 18.6%, respectively. A large external surface area of the HNZY support and the synergistic effect of Ga doping on ZnO enhance Lewis acid sites with the simultaneous decrease of the Bronsted acid sites. This unique catalyst (Ga-doped Zn/HNZY) is beneficial for controlling the consecutive reaction pathways of the decomposition of cellulose to glucose, retro-aldol condensation to trioses, and intramolecular Cannizzaro reaction to ML. English ROYAL SOC CHEMISTRY LACTIC-ACID DERIVATIVES SOLID LEWIS-ACIDS PORE ARCHITECTURE SUGAR CONVERSION ETHYL LACTATE BIOMASS WATER ZEOLITES GLUCOSE HYDROGENATION Direct conversion of cellulose to high-yield methyl lactate over Ga-doped Zn/H-nanozeolite Y catalysts in supercritical methanol Article 10.1039/c7gc00432j 1 GREEN CHEMISTRY, v.19, no.8, pp.1969 - 1982 GREEN CHEMISTRY 19 8 1969 1982 scie scopus 000399579500017 2-s2.0-85020183313 Chemistry, Multidisciplinary Green & Sustainable Science & Technology Chemistry Science & Technology - Other Topics Article LACTIC-ACID DERIVATIVES SOLID LEWIS-ACIDS PORE ARCHITECTURE SUGAR CONVERSION ETHYL LACTATE BIOMASS WATER ZEOLITES GLUCOSE HYDROGENATION