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Transfer Hydrogenation of Cellulose‐based Oligomers over Carbon‐supported Ruthenium Catalyst in a Fixed‐bed Reactor
Author(s) -
Shrotri Abhijit,
Kobayashi Hirokazu,
Tanksale Akshat,
Fukuoka Atsushi,
Beltramini Jorge
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201301020
Subject(s) - dehydrogenation , transfer hydrogenation , catalysis , cellulose , microcrystalline cellulose , chemistry , hydride , yield (engineering) , ruthenium , hydrogen , batch reactor , organic chemistry , chemical engineering , materials science , engineering , metallurgy
Ru supported on activated carbon was found to be active for the transfer hydrogenation of cellulose oligomers, which were produced by the milling of acidulated microcrystalline cellulose. A C 6 sugar alcohol yield of 85 % was obtained in less than 1 h reaction time in a batch reactor. Optimum reaction conditions for transfer hydrogenation were determined as 180 °C and a pH above 2.2 using glucose as a substrate. Use of deuterium as a marker established that direct transfer of hydride species from 2‐propanol to glucose occurs through the dihydride mechanism. Formation of molecular hydrogen from 2‐propanol dehydrogenation was found to be a side reaction, with little influence on the glucose hydrogenation step. Conversion of cellulose oligomers to hexitols was also achieved in a continuous flow fixed‐bed reactor with 36.4 % yield at a liquid hourly space velocity of 4.7 h −1 . The catalytic activity did not decrease even after 12 h of the onstream reaction.