Loaded copper catalyst for preparing anhydrous methanal by direct dehydrogenation of methanol, and preparation method for loaded copper catalyst

A technology of copper catalyst and anhydrous formaldehyde, which is applied in the field of catalysis, can solve the problems of high reaction temperature, high price, and low catalyst activity, and achieve the effects of simple preparation, low price, high activity and selectivity

Inactive Publication Date: 2012-05-02
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activity of these catalysts is low, and the required reaction temperature is high, generally requiring 600 o The reaction temperature above C has considerable productive rate, because the selectivity of catalysis is low and problems such as catalyst are expensive limit their industrial application, so if catalyst can guarantee higher anhydrous formaldehyde product

Method used

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  • Loaded copper catalyst for preparing anhydrous methanal by direct dehydrogenation of methanol, and preparation method for loaded copper catalyst
  • Loaded copper catalyst for preparing anhydrous methanal by direct dehydrogenation of methanol, and preparation method for loaded copper catalyst
  • Loaded copper catalyst for preparing anhydrous methanal by direct dehydrogenation of methanol, and preparation method for loaded copper catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Maintaining 60 o Under heating in a water bath and electromagnetic stirring, slowly add 10 mL of n-butyl titanate dropwise to a certain amount of absolute ethanol to form a light yellow colloid. After stirring for 30 minutes, add 2 mL of concentrated hydrochloric acid dropwise and stir evenly. Put colloid at 25 o After standing and aging for 24 hours under C, place it in an oven at 100 o C drying. Grind and dry the solid into powder, in the air atmosphere of the box furnace at 500 o C calcined for 4 hours. Wash the calcined powder with deionized water to be free of chloride ion (silver nitrate solution test), 80 o Dry the obtained carrier titanium dioxide in an oven. The spectrum of X-ray diffraction analysis of the carrier is as follows figure 2 , indicating that its crystal phase is anatase titanium dioxide. According to the content of the copper component, the prepared titanium dioxide was immersed in a 0.5mol / L copper acetate aqueous solution, and...

Embodiment 2

[0023] Example 2: Maintaining 70 o Under heating in a water bath and electromagnetic stirring, slowly add 15 mL of tetraethyl titanate dropwise to a certain amount of anhydrous acetone to form a light yellow colloid. After stirring for 60 minutes, add 1 mL of concentrated hydrochloric acid dropwise and stir evenly. Colloid at 60 o After standing and aging for 20 hours under C, put it in an oven for 90 o C drying. Grind and dry the solid into powder, in the air atmosphere of the box furnace at 450 o C calcined for 5 hours. Wash the calcined powder with deionized water to be free of chloride ion (silver nitrate solution test), 90 o Dry the obtained carrier titanium dioxide in an oven. The X-ray diffraction analysis of the carrier shows that its crystal phase is anatase titanium dioxide. According to the content of the copper component, the prepared titanium dioxide was immersed in a 1 mol / L copper acetate aqueous solution and left to stand for 20 hours. 90 o After dryin...

Embodiment 3

[0024] Example 3: In Sustain 6 o C water bath heating and electromagnetic stirring, slowly dropwise add 15mL tetraethyl titanate to a certain amount of anhydrous acetone to form a light yellow colloid, stir for 60 minutes, then add dropwise 2L concentrated hydrochloric acid and stir evenly. Colloid at 60 o After standing and aging for 20 hours under C, put it in an oven for 90 o C drying. Grind and dry the solid into powder, in the air atmosphere of the box furnace at 400 o C calcined for 5 hours. Wash the calcined powder with deionized water to be free of chloride ion (silver nitrate solution test), 90 oDry the obtained carrier titanium dioxide in an oven. The X-ray diffraction analysis of the carrier shows that its crystal phase is anatase titanium dioxide. According to the content of the copper component, the prepared titanium dioxide was immersed in a 1 mol / L copper acetate aqueous solution and left to stand for 20 hours. 90 o After drying in the oven, put it in t...

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Abstract

The invention discloses a novel loaded copper catalyst for preparing anhydrous methanal by the direct dehydrogenation of methanol, and a preparation method for the loaded copper catalyst. The preparation method for the catalyst comprises the following steps of: dripping a certain quantity of titanium-containing organic compounds into an organic solvent and reacting with stirring at constant temperature by a sol-gel method to form a colloid precursor, adding a proper amount of concentrated hydrochloric acid and stirring uniformly; aging, drying, and calcining at the appropriate temperature to obtain titanium dioxide serving as a carrier; and dipping the carrier in a soluble copper saline solution at appropriate concentration, and standing, drying, calcining, sieving, and reducing to prepare the catalyst, wherein the mass of loaded component copper is 0.1 to 5 percent that of the carrier. The catalyst required by preparing the anhydrous methanal and the preparation method for the catalyst plays a positive promotion role in the industrialization of preparing the anhydrous methanal by the methanol. The prepared catalyst for preparing the anhydrous methanal by the direct dehydrogenation of the methanol is high in activity and selectivity; the conversion rate of the methanol is over 98 percent under the reaction pressure of 0.1 MPa at low temperature of 450 DEG C, and the selectivity of the methanal is 100 percent; and the catalyst is easy to prepare and low in cost and is suitable for industrial application.

Description

[0001] technical field [0002] The invention belongs to the technical field of catalysis. The catalyst is composed of copper as an active component and titanium dioxide as a carrier, and is used for the preparation of a novel supported copper catalyst for direct dehydrogenation of methanol to produce anhydrous formaldehyde. Background technique [0003] With the continuous development of modern industry, the demand for anhydrous formaldehyde in industrial production is increasing day by day. Anhydrous formaldehyde is an important organic chemical raw material, widely used in the production of polyoxymethylene, phenolic resin, urotropine and other chemical products. In addition, it has also been widely used in the synthesis of polymer materials, high-grade fragrances, new drug intermediates and dyes. [0004] Catalysts for the preparation of formaldehyde. At present, iron-molybdenum oxide catalysts or silver catalysts are mainly used in industry to obtain formaldehyde throu...

Claims

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Application Information

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IPC IPC(8): B01J23/72C07C47/04C07C45/51
Inventor 李广社林海峰李莉萍颜廷江
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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