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Acid-resistant Ce-P-Co catalyst and preparation method thereof, and application for acid-resistant Ce-P-Co catalyst in synthesis of gamma-valerolactone

A ce-p-co, catalyst technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of strong acid corrosion, unable to serve the needs of industrial production, and cannot be used as a practical catalytic system to achieve Low cost, convenient large-scale preparation and application, and high industrial feasibility

Inactive Publication Date: 2019-05-03
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In such a strong acid reaction environment, almost all common transition metal catalysts will face the problem of strong acid corrosion and cannot be used as a practical catalytic system, let alone serve the needs of industrial production. Therefore, the development can efficiently realize the hydrogenation conversion of levulinic acid in aqueous solution , especially acid-resistant cheap catalysts and corresponding application methods, have become the key chemical technical problems to be solved in order to achieve sustainable and green production of lignin biomass conversion

Method used

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  • Acid-resistant Ce-P-Co catalyst and preparation method thereof, and application for acid-resistant Ce-P-Co catalyst in synthesis of gamma-valerolactone
  • Acid-resistant Ce-P-Co catalyst and preparation method thereof, and application for acid-resistant Ce-P-Co catalyst in synthesis of gamma-valerolactone
  • Acid-resistant Ce-P-Co catalyst and preparation method thereof, and application for acid-resistant Ce-P-Co catalyst in synthesis of gamma-valerolactone

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Experimental program
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Effect test

Embodiment 1

[0024] Preparation of catalyst Ce-P-Co (Ce:Co=0.08): Ce:Co=0.08 means that the molar ratio of cerium nitrate hexahydrate and cobalt nitrate hexahydrate is 0.08. Prepare salt solution A comprising 5.82 g of cobalt nitrate hexahydrate, 0.65 g of cerium nitrate hexahydrate and 50 ml of absolute ethanol. Place in a blender and stir. Prepare solution B containing 1.32 g of diammonium hydrogen phosphate and 50 ml of deionized water. Add the prepared aqueous solution B dropwise to the mixed salt solution A, and keep stirring for 1 h after the dropwise addition is complete. Afterwards, the resulting solution was transferred into a polytetrafluoroethylene hydrothermal reaction kettle, and reacted in an oven at 200° C. for 24 hours. After the reaction, the solid matter was centrifuged and washed twice with deionized water, then once with absolute ethanol, and then dried in an oven at 75° C. for 12 hours. Fill the dried solid into a quartz tube, and carry out high-temperature treatmen...

Embodiment 2

[0028]Preparation of catalyst Ce-P-Co (Ce:Co=0.17): Prepare salt solution A comprising 5.82g of cobalt nitrate hexahydrate, 1.43g of cerium nitrate hexahydrate and 50ml of absolute ethanol. Place in a blender and stir. Prepare solution B containing 1.76 g of diammonium hydrogen phosphate and 50 ml of deionized water. Add the prepared aqueous solution B dropwise to the mixed salt solution A, and keep stirring for 1 h after the dropwise addition is complete. Afterwards, the resulting solution was transferred into a polytetrafluoroethylene hydrothermal reaction kettle, and reacted in an oven at 200° C. for 24 hours. After the reaction, the solid matter was centrifuged and washed twice with deionized water, then once with absolute ethanol, and then dried in an oven at 75° C. for 12 hours. Fill the dried solid into a quartz tube, and carry out high-temperature treatment in a hydrogen atmosphere, specifically raising the temperature to 800°C at a heating rate of 5°C / min, and then ...

Embodiment 3

[0032] Preparation of the catalyst Ce-P-Co (Ce:Co=0.04): prepare a salt solution A comprising 5.82 g of cobalt nitrate hexahydrate, 0.17 g of cerium nitrate hexahydrate and 50 ml of absolute ethanol. Place in a blender and stir. Prepare solution B containing 1.32 g of diammonium hydrogen phosphate and 50 ml of deionized water. Add the prepared aqueous solution B dropwise to the mixed salt solution A, and keep stirring for 1 h after the dropwise addition is complete. Afterwards, the resulting solution was transferred into a polytetrafluoroethylene hydrothermal reaction kettle, and reacted in an oven at 200° C. for 24 hours. After the reaction, the solid matter was centrifuged and washed twice with deionized water, then once with absolute ethanol, and then dried in an oven at 75° C. for 12 hours. Fill the dried solid into a quartz tube, and carry out high-temperature treatment in a hydrogen atmosphere, specifically raising the temperature to 800°C at a heating rate of 5°C / min,...

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Abstract

The invention provides an acid-resistant Ce-P-Co catalyst and a preparation method thereof, and an application for the acid-resistant Ce-P-Co catalyst in synthesis of gamma-valerolactone. The catalystis a composite material composed of two components namely cerium phosphate and dicobalt phosphide in a molar ratio of 0.02 to 0.50. The preparation method comprises the following steps: preparing a mixed solution of cobalt salt and cerium salt, placing the mixed solution into a stirrer until the mixed solution is uniformly mixed, dropping a prepared monohydrogen phosphate solution B into the mixed solution, continuing stirring for 1 h, then transferring an obtained mixed solution into a polytetrafluoroethylene hydrothermal reaction kettle, and carrying out a reaction at 200 DEG C for 24 h; and after the reaction is completed, carrying out centrifuging so as to filter out a solid matter, carrying out washing, then carrying out drying at 75 DEG C, and carrying out high-temperature programmed treatment for 3 h in a hydrogen atmosphere at 800 DEG C. The acid-resistant Ce-P-Co catalyst provided by the invention has the advantages of low cost, simple synthetic method, environmentally-friendly process, and convenience in scale preparation and application. According to the invention, levulinic acid is converted into the gamma-valerolactone by hydrogenation, so the rate catalysis is rapid;conditions are relatively mild; the yield of the gamma-valerolactone can be up to 98%; and the catalyst is acid-resistant and can be recycled and stably used.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to the preparation and application of a green and high-efficiency catalytic system for synthesizing gamma-valerolactone by hydrogenating levulinic acid in aqueous solution. Background technique [0002] As an abundant renewable resource, lignocellulose is considered to be one of the important biochemical conversion substrates that can replace fossil raw material reserves for green and sustainable production of fuels and other chemicals. Generally, the conversion process starts with hydrolysis under acidic conditions to obtain levulinic acid (LA), and then uses LA as a platform raw material for the derivative conversion of high value-added chemical products. Among them, the one-step catalytic hydrogenation of LA can be applied to biofuels γ-valerolactone (GVL), chemical solvents and flavors, has received widespread attention. [0003] The hydrogenation of LA to GVL is usually...

Claims

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Application Information

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IPC IPC(8): B01J27/185C07D309/30
Inventor 赵丹冯慧娟张亚芳柯恒张迪慧陈超张宁
Owner NANCHANG UNIV
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