Functional carbon-based magnetic solid acid catalyst synthesized by using one-pot method and application thereof in catalyzing hydrolysis of bagasse to produce sugar

Abstract

The invention relates to a one-pot method for synthesizing a functional carbon-based magnetic solid acid catalyst. According to the invention, nanometer ferroferric oxide, glucose, citric acid, vanillin and hydroxyethyl sulfonic acid are used as raw materials, and a novel one-step hydrothermal precipitation-sulfonation method is adopted for synthesizing the carbon-based magnetic solid acid catalyst C-SO3H@Fe3O4 / C. Research results show that the synthesized catalyst has acidity of up to 1.23 mmol / g and magnetic strength of 15.65 Am<2> / kg. When the catalyst is used for hydrolyzing bagasse havingundergone alkali-freezing pretreatment at 180 DEG C, glucose with a yield of 62.59% and total reducing sugar with a yield of 73.01% can be obtained. In addition, the used catalyst can be separated and recovered under the action of an external magnetic field, and the recovery rate of the used catalyst can reach 93.18%. After the catalyst is recycled five times, the catalyst can still catalyze thehydrolysis of the bagasse to obtain glucose with a yield of 54.47% and total reducing sugar with a yield of 60.65% of total reducing sugar. The C-SO3H@Fe3O4 / C catalyst provided by the invention can efficiently catalyze the conversion of bagasse into fermentable sugar, and the catalyst shows good catalytic activity and stability.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a functional carbon-based magnetic solid acid catalyst synthesized by a one-pot method and its application in catalyzing the hydrolysis of bagasse to produce sugar. Background technique [0002] With the increasing demand for energy, increasing consumption of conventional petroleum, and serious environmental pollution problems, renewable biomass energy is considered to be the most potential substitute for synthetic fuels and related chemicals. Carbohydrates in biomass mainly exist in the form of cellulose and hemicellulose, which can be hydrolyzed to produce fermentable sugars such as glucose and xylose. Fermentable sugar is the most important bio-based platform that can be used to produce fuel compound. Cellulose is mainly a linear polymer molecule formed by glucose units connected by β-1,4-glucosidic bonds. There are a large number of intramolecular and intermole...

AI Technical Summary

Problems solved by technology

However, the carbon-based magnetic solid acid catalyst is mostly synthesized by a two-step method: carbonization, then sulfonation at a higher temperature, and finally the prepared catalyst product is separated from concentrated sulfuric acid, but the separation of the magnetic catalyst is still is a very complicated job

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