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纤维素水解是生物质资源转化利用中最关键的一步.通过硫酸浸渍活性炭方法制备的磺酸基功能化活性炭是目前纤维素水解反应中应用最为广泛的固体酸之一,但这种方法存在严重的环境污染问题.我们利用果糖的水热碳化,在150℃的温和条件下合成了一种新型的富含羧基和羟基的碳微球固体酸,在离子液体1-丁基-3-甲基咪唑氯盐[BMIM][Cl]溶剂体系中,该碳微球可以有效地将纤维素水解(130℃,反应3 h,还原糖产率45.6%).为了进一步提高碳微球固体酸的活性,以磺基水杨酸为共聚物,利用果糖的水热碳化反应,通过一步水热法合成了含有磺酸基的碳微球固体酸催化剂.系统研究了该催化剂作用下反应温度、反应时间、催化剂使用量、水的添加量以及纤维素起始浓度等因素对纤维素催化水解的影响.在[BMIM][Cl]溶剂中,纤维素水解的还原糖产率提高到了60.7%(130℃,反应90min),且催化剂循环5次后仍能保持良好催化活性.本工作利用果糖一步水热法制备碳微球固体酸,并将其应用于纤维素的高效水解,为生物质资源的高值化提供了一条新路径.
Cellulose hydrolysis is the most crucial step in biomass resource conversion and utilization.Sulfonic acid functional activated carbon prepared by sulfuric acid impregnated activated carbon is one of the most widely used solid acids in cellulose hydrolysis reaction at present, but this method has serious Of the environmental pollution.We use the hydrothermal carbonation of fructose to synthesize a new type of carboxyl acid and hydroxyl-rich carbon microspheres solid acid under the mild conditions of 150 ℃, in the ionic liquid 1-butyl-3-methyl In the system of imidazole chloride [BMIM] [Cl], the carbon microspheres can hydrolyze cellulose effectively (130 ℃, reaction for 3 h, yield of reducing sugar 45.6%) .In order to further improve the activity of solid acid , Sulfosalicylic acid was used as a copolymer and the sulfonic acid group-containing carbon microbead solid acid catalyst was synthesized by one-step hydrothermal method using the hydrothermal carbonation reaction of fructose. The effects of reaction temperature, reaction time , The amount of catalyst used, the amount of water added and the initial concentration of cellulose on the catalytic hydrolysis of cellulose were investigated. The yield of cellulose hydrolyzed reducing sugar increased to 60.7% (130 ℃) in [BMIM] [Cl] , Reaction 90min), and reminders The catalyst can still maintain a good catalytic activity after being recycled for 5 times.In this work, the solid acid of carbon microspheres was prepared by one step hydrothermal method of fructose, which was applied to the efficient hydrolysis of cellulose to provide a high value of biomass resources New path