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Silver supported catalyst for preparing anhydrous formaldehyde by direct dehydrogenation of methanol and manufacturing method thereof

A technology of anhydrous formaldehyde and silver catalyst, applied in the chemical industry, can solve the problems of low selectivity of catalysts to formaldehyde, no industrial application value, and industrial application restrictions, etc., achieve good industrial application prospects, facilitate large-scale industrial production, and react parameters insensitivity effect

Inactive Publication Date: 2006-07-05
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of the modern chemical industry, the demand for anhydrous formaldehyde is increasing day by day. At present, anhydrous formaldehyde is prepared from commercial formaldehyde (prepared by oxidative dehydrogenation of methanol) through rectification, extraction and other means to remove water. This process consumes More energy, not economical, in this situation, the method of direct dehydrogenation of methanol to produce anhydrous formaldehyde came into being, and the choice of catalyst is the key to the implementation of this scheme
Existing patent reports have catalysts composed of copper, silver, and silicon (Special Publication No. 41-11853), molten zinc, potassium, indium or aluminum or alloys of these metals (Special Publication No. 47-19251), carbon-containing molten Zinc or zinc-containing alloys (Japanese Patent Opening No. 48-97808) and catalysts composed of copper, zinc, and selenium (Japanese Patent No. 52-215), etc., but most of the catalysts obtained by these methods have short life, low reactivity, and no industrial Value
And the catalyzer (patent open clear 51-1407) that is made up of copper, zinc, sulfur and the catalyzer that is made up of copper, zinc supply gaseous sulfide and carry out methanol dehydrogenation (patent open clear 51-76209), in reaction product or discharge Sulfur is mixed in the gas, which limits its industrial application due to environmental pollution and other issues
The use of a sodium-containing catalyst increases the formaldehyde yield to 70% (Appl.Catal.A: Gen., 2001 (213) 203), but its industrial application is limited due to problems such as its catalyst life and regeneration
Ag-SiO reported in Japanese patent (Japanese Patent Application No. 60-89441) 2 -ZnO catalyst obtained a methanol conversion of 69.4% and a formaldehyde yield of 51.8%. The main defect of the catalyst is that the existence of the surface basic center leads to the generation of by-product CO, which makes the selectivity of the catalyst to formaldehyde low.
We prepared Ag-SiO 2 -Al 2 o 3 Catalyst and apply it to the reaction of direct dehydrogenation of methanol to produce anhydrous formaldehyde, a methanol conversion rate of 95.0% and a formaldehyde yield of 81.2% are obtained, but the by-product DMF is formed due to the action of its acidic carrier

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: take by weighing 0.112g silver nitrate and be dissolved in 500ml water, add 3.68gAl (NO 3 ) 3 9H 2 O, put it into a 250ml three-neck bottle after dissolving, add 26.5ml tetraethyl orthosilicate drop by drop, and at the same time vigorously electromagnetically stir, maintain the temperature of the oil bath at 50°C, and add 30ml of gelling agent ~ ethanol, put it on the reflux condensation tube, after stirring for two hours, slowly add 0.01mol / lZn(NO 3 ) 2 The solution was 10ml, and the stirring was stopped after the sol solidified, the temperature was raised to 80°C, and the solvent was evaporated for 10 hours. Transfer to a crucible, bake with an infrared lamp for 24 hours, then transfer to a muffle furnace for 10 hours at 700°C, and pulverize to 40-60 mesh to obtain 1#Ag-SiO 2 -Al 2 o 3 - ZnO catalyst.

Embodiment 2

[0020] Embodiment 2: take by weighing 0.83g silver nitrate and be dissolved in 100ml water, add 2.60g Zn (NO 3 ) 2 ·6H 2 O, put it into a 250ml three-necked bottle after dissolving, add 26.5ml tetraethyl orthosilicate drop by drop, and at the same time vigorously electromagnetically stir to maintain the temperature of the oil bath at 70°C, and add 50ml of gelling agent ~ isopropanol, put it on Reflux condenser, after stirring for one hour, slowly add 0.01mol / l Al(NO 3 ) 3 The solution was 30ml, the stirring was stopped after the sol solidified, the temperature was raised to 70°C, and the solvent was evaporated for 8 hours. Transfer to a crucible, bake with an infrared lamp for 24 hours, then transfer to a muffle furnace and bake at 800°C for 10 hours, and crush to 40-60 mesh to obtain 2#Ag-SiO 2 -Al 2 o 3 - ZnO catalyst.

Embodiment 3

[0021] Embodiment 3: take by weighing 1.414g silver nitrate and be dissolved in 100ml water, add 3.68g Al (NO 3 ) 3 9H 2 O, put it into a 250ml three-neck bottle after dissolving, add 16.8ml tetraethyl orthosilicate, and at the same time vigorously electromagnetically stir, maintain the temperature of the oil bath at 70°C, add 50ml of gelling agent ~ ethanol, install a reflux condenser, After stirring for two hours, slowly add 0.1mol / l Zn(NO 3 ) 2 The solution was 10ml, and the stirring was stopped after the sol solidified, the temperature was raised to 90°C, and the solvent was evaporated for 10 hours. Transfer to a crucible, bake with an infrared lamp for 24 hours, then transfer to a muffle furnace and bake at 900°C for 10 hours, and crush to 40-60 mesh to obtain 3#Ag-SiO 2 -Al 2 o 3 - ZnO catalyst.

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Abstract

The invention is a novel supported silver catalyst for preparing anhydrous formaldehyde by direct methanol dyhydrogenation. It is prepared by a sol-gel method (SOL-GEL method), i.e. mixing a certain amount of TEOS (tetraethoxysilane) with the water or alcohol solution containging soluble Zn and Al salts, then dripping to an inorganic silver salt water solution and preparing it through gelling, ageing, drying, baking, etc. During the gelling course, the Zn and Al salt solution added make acid-alkali neutralization to some extent, which largely enhances its activity and selectivity. It not only has high catalytic activity and longer service life but also simple and convenient to prepare, having lower price and suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a silver-loaded catalyst used for direct dehydrogenation of methanol to prepare anhydrous formaldehyde and a preparation method thereof. Background technique [0002] Direct dehydrogenation of methanol to anhydrous formaldehyde is an emerging route for the preparation of formaldehyde. With the development of the modern chemical industry, the demand for anhydrous formaldehyde is increasing day by day. At present, anhydrous formaldehyde is prepared from commercial formaldehyde (prepared by oxidative dehydrogenation of methanol) through rectification, extraction and other means to remove water. This process consumes In this situation, the method of direct dehydrogenation of methanol to anhydrous formaldehyde came into being, and the choice of catalyst is the key to the implementation of this scheme. Existing patent reports have catalysts composed of copper, si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50C07C47/055
Inventor 戴维林任丽萍曹勇范康年
Owner FUDAN UNIV
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