Supported catalyst and application thereof in hydrocracking reaction of xylitol

A technology for supporting catalysts and catalysts, applied in catalyst activation/preparation, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., which can solve problems such as environmental pollution and waste of renewable resources

Active Publication Date: 2011-04-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, corncobs, as a kind of agricultural waste, have been burned as cheap fuel, which not only caused a great waste of renewable resources, but also caused great pollution to the environment

Method used

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  • Supported catalyst and application thereof in hydrocracking reaction of xylitol
  • Supported catalyst and application thereof in hydrocracking reaction of xylitol
  • Supported catalyst and application thereof in hydrocracking reaction of xylitol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 catalyst preparation

[0018] For preparing catalyst of the present invention, carrier adopts coconut shell activated carbon, and its characteristics are as follows:

[0019] Specific surface: 1306.80m 2 / g; average pore size: 2.4nm; particle size: 80-100 mesh. Dry before use.

[0020] Catalyst preparation process: Weigh a certain mass of nickel nitrate, dissolve it in water, then add 10 g of dried activated carbon carrier (nickel loading is 10%), impregnate for 24 hours, and dry overnight. After the preparation of the supported nickel nitrate precursor is completed, it is calcined at 250-600°C for 3h; then use 0-2M KBH containing 0.2MNaOH 4 Disposal of the reduced catalyst.

Embodiment 2

[0021] Example 2 The activity evaluation of the catalyst prepared by carbothermal reduction at different calcination temperatures

[0022] This example studies the influence of one of the key steps in the catalyst preparation process - high temperature calcination for carbothermal reduction on the performance of the catalyst. KBH 4 The concentration is 2M.

[0023] Catalyst performance evaluation: 5 g of the catalyst prepared in Example 1 and 150 g of 10% xylitol aqueous solution were added to a 600 ml autoclave, and the air was replaced with hydrogen for 5 times after sealing. Heat the reaction vessel, and when the temperature reaches 200°C, fill it with hydrogen at a pressure of 5 MPa, stir rapidly, and start timing the reaction. After 6 hours, the stirring was stopped, and the hydrogen gas was released after the temperature of the reaction kettle was lowered to room temperature. Sampling analysis, xylitol quantitative analysis using liquid chromatography-differential ref...

Embodiment 3

[0030] Example 3KBH 4 The effect of adding on the catalyst performance

[0031] This example studies the second key step in the catalyst preparation process—passing the carbon-thermally reduced catalyst through KBH 4 After treatment, the effect on catalyst performance. The catalyst is the catalyst in Example 1, and the carbothermal reduction temperature is 450°C.

[0032] The performance evaluation of the catalyst is the same as in Example 2, and the results are shown in Table 3.

[0033] table 3

[0034]

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Abstract

The invention relates to a catalyst for hydrocracking of xylitol, in particular to a supported catalyst and application thereof in hydrocracking reaction of xylitol. A non precious metal Ni is used as a hydrogenation active ingredient; an aid is one or more of Ru, Pd, Pt, Mo, Sn, Mg, Zn, Ce, Cu, Al and Zr; a carrier is active carbon; and a preparation method comprises the following steps of: supporting aqueous solution of soluble metal salt on the active carbon carrier; performing carbothermic reduction by roasting a metal salt precursor supported on the active carbon carrier at high temperature of between 450 and 650 DEG C to obtain a metal catalyst; and treating the metal catalyst for 1 to 4 hours by using 1-2mol/L KBH4 solution. Under the action of the catalyst, the xylitol is efficiently hydrocracked to form glycol, 1,2-propylene glycol and glycerol, the conversion rate is over 80 percent, and the total selectivity is over 90 percent.

Description

technical field [0001] The present invention relates to xylitol hydrocracking catalyst, specifically develops a preparation method of high-efficiency cracking catalyst, and applies it to xylitol hydrocracking to obtain ethylene glycol, 1,2 with high selectivity - Propylene glycol and glycerin. Background technique [0002] my country is a large agricultural country, with an annual corn output of 110 to 130 million tons and about 20 million tons of corn cobs as by-products. For a long time, corn cobs, as a kind of agricultural waste, have been burned as cheap fuel, which not only caused a great waste of renewable resources, but also caused great pollution to the environment. Therefore, it is urgent to seek new ways to exploit corncobs, make full use of the advantages of renewable resources, and reduce the impact on living environment pollution. [0003] Xylitol is a biomass polyol derived from corncobs. The current utilization rate is relatively low. The development and res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/883B01J23/835B01J23/755B01J23/78B01J23/80B01J23/83B01J23/89B01J37/16B01J37/00C07C29/00C07C31/20C07C31/22
Inventor 徐杰于维强邵守言苗虹凌晨马红曹宏兵赵静
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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