Absorbent charcoal based catalyst carrier, catalyst, preparation and uses thereof

A technology of catalyst carrier and activated carbon, which is applied in the direction of catalyst carrier, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve the problems of serious desorption of metal ions and low acid strength

Inactive Publication Date: 2009-05-13
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in aspects such as severe metal ion desorption and low acid strength in the process of using activated carbon as a cat

Method used

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  • Absorbent charcoal based catalyst carrier, catalyst, preparation and uses thereof
  • Absorbent charcoal based catalyst carrier, catalyst, preparation and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Preparation method of activated carbon-based catalyst and its catalytic performance

[0022] A, the preparation method of activated carbon-based catalyst carrier, its process steps are:

[0023] a. Deashing treatment: add 10 grams of activated carbon with a particle size of 10 meshes (coal-based activated carbon with 10.8% ash content) into 30 ml of caustic soda solution with a concentration of 1.5 moles, slowly stir at 40-60 ° C for 1.5 hours, filter, wash with water to neutrality; then add 30 ml of hydrochloric acid solution with a concentration of 1.5 molar, slowly stir at 60-70 ° C for 2 hours, filter, and obtain deashed activated carbon for later use. It was detected that the ash content dropped to about 5%.

[0024] b. Impregnation pretreatment: Then take 25ml of sulfuric acid aqueous solution with a mass concentration of 60% and add it to the above deashing activated carbon for mixing, soak at room temperature for 12 hours, then filter and dry to obta...

Embodiment 7

[0038] According to the catalyst obtained in Examples 1-6, the catalytic activity experiment was carried out. The results showed that the catalyst could catalyze the synthesis of cyclohexanone-1,2-propanediol ketal and cyclopentanone-ethylene glycol ketal with high yield. above 88%. Moreover, the metal ions were not desorbed during the experiment, the amount of catalyst used was small, and the yield could be reused 6 times with little decrease. Its catalytic performance is significantly higher than that reported in the literature, and also higher than the catalyst carrier itself.

[0039] An example is as follows: The optimal synthesis reaction conditions are determined by orthogonal experiments: 0.1 mol of cyclopentanone, 1.70 mol of ethylene glycol, 9.5% (mass fraction) of the amount of cyclopentanone with water agent cyclohexane, catalyst When it is 9.5% (mass fraction) of the amount of cyclopentanone, it is added to a 100 mL three-necked flask, a water separator, a reflux...

Embodiment 8

[0041] Catalytic activity experiments were carried out according to the catalysts obtained in Examples 1-6. The results showed that the above catalysts could also catalyze the synthesis of esters such as dibutyl oxalate, tripentyl citrate and isoamyl acetate. The conversion rate remains above 92%. The esterification rate remained stable after repeated use for 6 times.

[0042] It shows that the prepared activated carbon-based catalyst is a good solid acid catalyst.

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Abstract

The invention relates to a method for preparing activated carbon which is utilized as a catalyst carrier, as well as a method for preparing a catalyst by utilizing the catalyst carrier and the application of the catalyst. The technical scheme of the invention comprises the following steps: taking activated carbon as a raw material; pretreating with an alkaline solution and an acid solution in sequence; treating in an oxidation manner appropriately; modifying through the implantation of metal salt; structuring a compound polyacid center on the surface of the activated carbon; obtaining activated carbon solid acid catalytic materials with higher performance through a series of continuous processing steps; and taking the modified activated carbon as the catalyst to catalyze the synthetic reaction of acetal (ketone) and the like. The catalyst prepared by using the technical scheme achieves better effect on separate catalysis of composite ketal and can be used repeatedly, recovered and regenerated.

Description

Technical field [0001] The invention relates to a method for using activated carbon as a catalyst carrier and a preparation method of the carrier, a method for preparing a catalyst using the carrier and the application of the catalyst. Background technique [0002] In recent years, the research on synthetic methods that meet the requirements of green chemistry has attracted people's attention. For example, the use of solid acids, heteropolyacids and solid superacids as catalysts to catalyze the synthesis of ketals (aldehydes), esters, hydrocarbon compounds, etc. has become the goal of achieving cleaner production. Among them, people have studied the reaction conditions for catalyzing the synthesis of ketals (aldehydes) and esters using activated carbon-supported silicotungstic acid as a catalyst, but the yields are generally low. The research group of the present inventor has also partially studied the catalytic properties of ketals (aldehydes) and esters by using modified ...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/18C07B41/06C07B41/12
Inventor 刘万毅张惠芳杨金会胡奇林
Owner NINGXIA UNIVERSITY
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