Eco-Friendly Ca-Montmorillonite Grafted by Non-Acidic Ionic Liquid Used as A Solid Acid Catalyst in Cellulose Hydrolysis to Reducing Sugars.

Yang Zhou,Dongshen Tong,Haiyan Yang,Miao Yang,Kai Fang

doi:10.3390/molecules24091832

Yang Zhou, Dongshen Tong + Show 3 more

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https://doi.org/10.3390/molecules24091832

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Abstract

An effective and friendly method was developed for the production of reducing sugars (RS) from the hydrolysis of cellulose over the solid catalyst of Ca-montmorillonite (Mt) grafted by non-acidic ionic liquid (Mt-IL) in water. The effect of mass ratio, water dosage, reaction temperature, and time were investigated in a batch reactor. Raw Mt showed only a 7.9% total reducing sugars (TRS) yield for the catalytic hydrolysis of cellulose in water. As the Mt was grafted by -SO3H and IL, the TRS yield greatly increased under the same reaction conditions. The highest TRS yield of 35.7% was obtained on the catalyst of Mt grafted by non-acidic IL at 200 °C with the mass ratio of catalyst to cellulose of 0.2 for 120 min. The high TRS yield for Mt-IL should be attributed to the synergistic effect of the dissolution of cellulose by IL and the exposed metal ions on the layer with water. Although the yield of TRS on Mt-IL decreased gradually with recycling runs, the decrease after the first run was not very serious compared to the fresh catalyst. This work provides a promising strategy for efficient cellulose hydrolysis into fine chemicals by Mt with non-acidic IL.

Highlights

The depletion of fossil fuel resources and global climate change have led to more and more attention on developing a series of novel chemicals based on renewable feedstocks
An efficient and friendly catalyst was prepared for the hydrolysis of cellulose to reducing sugars in water
The montmorillonite grafted by non-acidic ionic liquid (Mt-IL) catalyst was active for the hydrolysis of cellulose

Summary

Introduction

The depletion of fossil fuel resources and global climate change have led to more and more attention on developing a series of novel chemicals based on renewable feedstocks. Many studies have been devoted to converting renewable biomass to useful chemicals and clean fuels [1,2,3]. The conversion of cellulose to value-added chemicals has been extensively studied [4,5,6]. Cellulose is a water-insoluble aggregate of long-chain β-1,4 glucan composed of glucose monomers linked by β-1,4 glycosidic bonds. Hydrolysis of β-1,4 glycosidic bonds and decomposition of hydrogen bonds linking β-1,4 glucan chains into water-soluble saccharides are the main technology to obtain

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