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Current Catalysis

Editor-in-Chief

ISSN (Print): 2211-5447
ISSN (Online): 2211-5455

Synthesis of an Immobilized Brönsted Acidic Ionic Liquid Catalyst and Hydrolysis of Cellulose in Water Under Mild Conditions

Author(s): Ananda S. Amarasekara and Bernard Wiredu

Volume 2, Issue 3, 2013

Page: [219 - 224] Pages: 6

DOI: 10.2174/22115447113029990011

Price: $65

Abstract

A Brönsted acidic ionic liquid catalyst with a sulfonic acid group tethered to imidazolium cation, and immobilized on polystyrene was prepared by a two step method in 83% overall yield. This immobilized Brönsted acidic ionic liquid catalyst was shown to be a significantly better catalyst than H+ form of Dowex-50X8 of similar SO3H group loading for hydrolysis of untreated Sigmacell cellulose (DP ~ 450) in water under hydrothermal conditions. For example cellulose hydrolyzed with immobilized Brönsted acidic ionic liquid catalyst produced 50.1 % yield of total reducing sugars (TRS) after 3 hr, at 160 °C, whereas sample heated with Dowex-50X8 produced only 9.2 % TRS yield under identical conditions. Similarly, cellulose hydrolysis using immobilized ionic liquid catalyst produced a maximum glucose yield of 21.7% after 3 hr, at 160 °C, while the maximum glucose yield with Dowex-50X8 catalyst was 4.5 %, which was achieved after 3 hr, at 170 °C. This enhancement in catalytic activity is explained as a result of an interaction between cellulose, and immobilized imidazolium ionic liquid structure with chloride anion.

Keywords: Cellulose, hydrolysis, Acidic ionic liquid, Saccharification, Solid acid catalyst.


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