Copper zinc catalyst and precursor, preparation and use thereof

A catalyst, copper-zinc technology, applied in the field of copper-zinc catalyst and its precursor, can solve the problems of short service life, poor thermal stability, low catalytic activity and the like

Inactive Publication Date: 2008-11-05
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a new catalyst with better thermal stability and longer service life in order to overcome the defects of poor therma

Method used

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  • Copper zinc catalyst and precursor, preparation and use thereof
  • Copper zinc catalyst and precursor, preparation and use thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] Preparation of MCM-41 Mesoporous Molecular Sieve

[0047] At room temperature, add 25L of deionized water and 5kg of structural template agent hexadecyltrimethylammonium bromide to a 100L horizontal reactor, control the stirring speed at 100rpm, and add acid dropwise to the reactor under sufficient stirring. Regulator HCl, make the pH of the system = 6, then add 3.01kg sodium silicate and 30g sodium metaaluminate into the reactor, continue to stir for 12h, then age for 45h, the obtained material is transferred to an autoclave for crystallization, crystallization The crystallization temperature is 175°C and the crystallization time is 80h. During the crystallization process, the solid content gradually increases, and the reactor needs to be stirred to make the obtained particle size more uniform, and the stirring speed is adjusted to 60rpm. The obtained liquid-solid mixture is taken out after cooling down, filtered, washed, dried and calcined to obtain a powder state me...

Embodiment 1

[0048] Embodiment 1 High temperature and high pressure catalytic hydrogenation

[0049] Preparation of copper-zinc molecular sieve catalyst

[0050] Add 3 kg of the powdery mesoporous molecular sieve prepared in Reference Example 1 into a horizontal reactor filled with 25 L of aqueous solution in which copper nitrate and zinc nitrate are dissolved, and impregnate. Wherein the copper ion concentration in the aqueous solution is 8.19mol / L, and the zinc ion concentration is 1.638mol / L. The above liquid-solid mixture was stirred at room temperature for 0.5 h. After the stirring was completed, the material was taken out and filtered to obtain a solid filter cake. The filter cake is mixed with the binder silica sol, and the binder hydrogenated polydextrose is also added at the same time. The amount of the binder is 0.5%wt of the filter cake, and the amount of the auxiliary binder is 10%wt of the binder. After the filter cake, binder and binder are fully mixed, a paste is obtained...

Embodiment 2

[0054] Embodiment 2 High temperature and high pressure catalytic hydrogenation

[0055] Preparation of copper-zinc molecular sieve catalyst

[0056] The powdered mesoporous molecular sieve obtained in Reference Example 1 was mixed with the binder aluminum sol, and the binder phenolic resin was added at the same time. The amount of the binder is 30%wt of the filter cake, and the amount of the auxiliary binder is 0.01%wt of the binder. After the carrier, binder and co-binder are fully mixed, the paste is obtained and finally granulated in a catalyst granulator to obtain cylindrical granules with a diameter of about 6mm and a height of about 6mm, which is the medium after granulation. Molecular sieve.

[0057] Add 12 kg of the granulated mesoporous molecular sieve into a vertical reactor containing 25 L of an aqueous solution in which cupric chloride and zinc sulfate have been dissolved for impregnation. Wherein the copper ion concentration in the aqueous solution is 6.85mol / L...

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Abstract

The invention discloses a Cu-Zn catalyst, a precursor, a preparation method and an application thereof. The Cu-Zn catalyst takes a mesoporous molecular sieve as a carrier to load active components comprising cuprum and zinc. The preparation method comprises the following steps: the mesoporous molecular sieve is added into a water solution holding cuprum ions and zinc ions for soaking, filtered to obtain solid filter cakes which are mixed with a bonder and a bonding aid for prilling, then dried, roasted and cooled, thus obtaining the precursor of the Cu-Zn catalyst of the invention, or the mesoporous molecular sieve also can be mixed with the bonder and the bonding aid for prilling, added to the water solution holding the cuprum ions and the zinc ions for soaking, then dried, roasted and cooled. The precursor of the Cu-Zn catalyst of the invention is deoxidized in a reduction atmosphere to obtain the Cu-Zn catalyst of the invention. The Cu-Zn catalyst of the invention not only has good catalyzing efficiency, but also has good stability, high catalytic activation and relatively long service life, thus being able to be applied to the reaction of high temperature and high pressure catalytic hydrogenation of fatty acid ester or the preparation of fatty alcohol by hypercritical catalytic hydrogenation.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a copper-zinc catalyst and its precursor, their preparation method and application. Background technique [0002] Fatty alcohol is an important basic raw material for the production of surfactants and lubricants. Using the hydroxyl functional group in its molecular structure, it can react with a variety of compounds to obtain widely used fatty alcohol derivatives, such as fatty alcohol sodium sulfate (AS), fat Amines, alkyl glycosides (APG), fatty alcohol polyoxyethylene ethers (AEO) and fatty alcohol polyoxyethylene ether sulfates (AES), etc. [0003] Most of the fatty alcohols used as surfactant raw materials are deep-processed products derived from natural oils. The main process, such as the method reported in the literature of "Kreutzer, U.R.Manufacture of Fatty Alcohols Based on Natural Fats and Oils, JAOCS 61 (2): 343-348 (1984), is first to combine triglycerides in natural oils w...

Claims

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Application Information

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IPC IPC(8): B01J29/064B01J29/00C07C29/149
CPCY02P20/54
Inventor 曹贵平王劭泓黄辉王述家范春玲张明华
Owner EAST CHINA UNIV OF SCI & TECH
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