A preparation method of silica gel pillared mesoporous biomass carbon solid sulfonic acid

Abstract

The invention provides a method for preparing silica gel pillared mesoporous biomass carbon solid sulfonic acid (SiO2-BC-SO3H) using lignocellulosic biomass, and a method for using it to catalyze the hydrolysis of sucrose to prepare glucose. The preparation of SiO2‑BC‑SO3H includes thermal carbonization of biomass or dehydration and carbonization of concentrated sulfuric acid, boiling water swelling, acidic silica sol intercalation, heating (350°C) dehydration in nitrogen, and sulfonation of concentrated sulfuric acid. The present invention confirms that the silica gel content of SiO2-BC-SO3H prepared through the above steps is about 15wt%, the sulfonic acid group density is above 0.9 mmol / g, and it has an interlayer mesoporous structure. It is used to catalyze the sucrose hydrolysis reaction and shows better catalytic activity and reusability than non-porous biomass carbon solid sulfonic acid.

Description

technical field [0001] The invention belongs to the field of preparation of mesoporous biomass carbon materials between pillared layers, and specifically relates to a method of using silica sol as a pillaring agent to prepare SiO solid sulfonate of mesoporous biomass carbon between silica gel pillared layers 2 -BC-SO 3 H catalyst, and the method for using the catalyst to catalyze the hydrolysis reaction of sucrose. Background technique [0002] With the deterioration of the global environment and the shortage of fossil energy, it has become a development issue to seek a green, low-cost, high-efficiency and sustainable new energy to meet the growing demand for energy. Biomass, as a resource with a wide range of sources, low cost, and environmental protection, has attracted more and more attention. The development and utilization of biomass resources has become a research hotspot. Biomass can form bio-based carbon materials through various carbonization technologies such as ...

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Problems solved by technology

However, since this type of solid sulfonic acid has a size of about 1-1.5nm, the polymerized aromatic alkenes can be stacked to form a dense graphene-like layered non-porous structure through the strong hydrogen bonding force of its edge polar functional groups (K Nakijima, M. Hara , ACS Catal. , 2012, 2 1296-1304), its sulfonic acid site is blocked, which has a repulsive effect on the reaction of some non-polar compounds; in addition, due to the low degree of carbonization, some of its small molecule carbon sheets will be released from the carbon bulk layer in the acid-catalyzed process The aggregates fall off, resulting in poor reusability of the catalyst (Xunhua Mo, Dora E. López, Kaewta Suwannakarn, Yijun Liu, Edgar Lotero, James G. Goodwin Jr, Changqing Lu, Journal of Catalysis 254 (2008) 332–338 )

High-temperature catalytic thermal carbonization can prepare high-surface bio-based solid sulfonic acid materials with stable pore structure, but this type of catalyst has many micropores and low sulfonic acid content, resulting in low acid catalytic efficiency (Suganuma, S.; Nakajima, K. ; Kitano, M.; Yamaguchi, D.; Kato, H.; Hayashi, S.; Hara, M. J. Am. Chem. Soc. 2009, 131, 12787−12793)

Although hard templating (Ryoo, R.; Joo, S. H.; Jun, S. J. Phys. Chem. B 1999, 103, 7743) or soft templating (Meng, Y.; Gu, D.; Zhang, F. Q.; Shi, Y. F.; Yang, H. F.; Li, Z.; Yu, C. Z.; Tu, B.; Zhao, D. Y. Angew. Chem., Int. Ed. 2005, 44, 7053) Preparation of biocarbon-based materials with ordered mesoporous structure, However, the cost of raw materials used is high, the preparation process is complicated, difficult to control, the yield is low, and the sulfonation ability is also poor, so the industrial application value as a solid acid is not high.

[0003] In summary, in order to prepare bio-based solid carbon sulfonic acid with larger specific surface and stable pore structure, the present invention provides a kind of using cheap silica sol as propping agent, adopting hydrothermal intercalation method to roast and dehydrate, Then use the method of preparing silica gel pillared mesoporous biomass solid carbon sulfonic acid material by sulfonation with concentrated sulfuric acid. The prepared solid acid catalyst has high mass transfer efficiency and excellent reusability in catalyzing sucrose hydrolysis reaction, which overcomes the traditional non- Porous biomass carbon sulfonic acid has the disadvantages of low mass transfer efficiency and poor stability

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