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A kind of nano na/fe composite solid acid catalyst and its preparation method and application

A solid acid catalyst and composite technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of low furfural selectivity, low selectivity, secondary There are many products, etc., to achieve the effects of cheap and easy-to-obtain raw materials, improved selectivity, and simple preparation process

Active Publication Date: 2020-07-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a nano-Na / Fe composite solid acid catalyst and its preparation method and application, the purpose of which is to solve the problems of low production capacity and low The present situation of selectivity, the catalyst uses magnetic iron oxide particles as the core, and the active group Na + / H + Uniformly dispersed on the surface and internal pores of the protected magnetic iron oxide particles, the purpose is to solve the current situation of low production capacity and low selectivity in the preparation of furfural by biomass pyrolysis, and solve the problem of furfural selection in the prior art It has realized the directional conversion and high-value utilization of biomass, and has the advantages of simple preparation process, low cost and high selectivity.

Method used

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  • A kind of nano na/fe composite solid acid catalyst and its preparation method and application
  • A kind of nano na/fe composite solid acid catalyst and its preparation method and application
  • A kind of nano na/fe composite solid acid catalyst and its preparation method and application

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preparation example Construction

[0033] A method for preparing a nano-Na / Fe composite solid acid catalyst provided in an embodiment of the present invention comprises the following steps:

[0034] S1 weighs the required mass of FeCl 3 ·6H 2 O and FeCl 2 4H 2 O, put into deionized water and stir evenly to form a clear solution, add hydrochloric acid and stir, wherein, FeCl 3 ·6H 2 O and FeCl 2 4H 2 O by Fe 3+ :Fe 2+ The molar fraction ratio of the preparation is 2:1, the concentration of hydrochloric acid is 12mol / L, and the addition amount of hydrochloric acid is according to Fe 3+ :H + The mole fraction ratio is determined at 1.5:2;

[0035]S2 is gradually dripped into the NaOH solution under the agitation of the stirrer to produce red and black precipitates, until the pH of the solution is 2-6, the dropwise addition is completed, and the stirring is continued, and then it is allowed to stand for a period of time to drop to room temperature, wherein the concentration of the NaOH solution is 1mol / ...

Embodiment 1

[0042] Weigh 31.62g of ferric chloride hexahydrate and 12.54g of ferric dichloride tetrahydrate, stir in 150ml deionized water to form a clear solution, add dropwise 5ml of 12mol / L hydrochloric acid and stir, then adopt forward coprecipitation method, in Under stirring with a magnetic stirrer at 60°C, 1.5mol / L NaOH solution was gradually added dropwise. At this time, a red-black precipitate was formed immediately, and the dropwise addition was completed when the Na / Fe mass ratio of the solution was equal to 1.42, and then continued to maintain a constant speed (800r / min ) and stirred for 1 hour, and left to stand for about 30 minutes to lower the temperature to room temperature. The reaction product was recovered by centrifugation, washed twice with 1600ml of deionized water, collected, and baked in an oven at 60°C for 12 hours to obtain a nano-Na / Fe composite solid acid catalyst.

[0043] Using cellulose as raw material for catalytic pyrolysis, cellulose and nanometer Na / Fe c...

Embodiment 2

[0046] This example is the same as Example 1, except that the amount of NaOH added is prepared with a final Na / Fe mass ratio of 0.36, and other conditions are the same as Example 1.

[0047] figure 1 b is the SEM image of the catalyst prepared in Example 2, from which it can be seen that the catalyst has a rod-like morphology.

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Abstract

The invention belongs to the technical field of biomass utilization, and particularly discloses a nanometer Na / Fe composite type solid acid catalyst and a preparation method and application thereof. The preparation method of the catalyst comprises the following steps that ferrous chloride and ferric chloride are mixed to be uniform under the action of hydrochloric acid according to the certain ratio, then, sodium hydroxide is dropwise added, and the nanometer Na / Fe composite type solid acid catalyst is prepared through a forward sedimentation method. Biomass and the prepared nanometer catalystare mixed according to the certain ratio, pyrolysis is performed under the inert atmosphere, and the high-selectivity furfural product can be obtained. The catalyst is simple in preparation process,low in cost, high in selectivity, capable of solving the problems that in the prior art, furfural selectivity is low and few by-products are produced, and capable of achieving biomass directional conversion and high-value utilization.

Description

technical field [0001] The invention belongs to the technical field of biomass utilization, and more specifically relates to a nanometer Na / Fe composite solid acid catalyst and its preparation method and application. Background technique [0002] For a long time, the production of basic chemical products using fossil resources as raw materials has faced the problem of resource shortage, and it has become an inevitable trend to find a clean and renewable alternative new energy. Biomass energy is the solar energy converted and stored by green plants through photosynthesis, and it is also the only renewable carbon source. It is expected to become one of the important ways to replace fossil energy and solve energy-related problems. my country's biomass resources are very rich, mainly including crop straw, forest waste, industrial organic waste and household garbage. There are various types of biomass, and its composition is also varied. In addition to ash, woody biomass is main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J37/03B01J35/10C07D307/48
CPCB01J23/78B01J35/0033B01J35/1019B01J37/03C07D307/48
Inventor 杨海平白小薇杨晴陈应泉邵敬爱陈伟王贤华胡俊豪张雄张世红陈汉平
Owner HUAZHONG UNIV OF SCI & TECH
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