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Monolithic iron-molybdenum catalyst for preparing formaldehyde through methanol oxidation as well as preparation and application of monolithic iron-molybdenum catalyst

A catalyst and monolithic technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, carbon-based compound preparation, etc., can solve the complicated tablet forming process, time-consuming filling process, and Process complexity and other issues, to achieve the effect of simplifying the filling process, improving service life and reducing energy consumption

Pending Publication Date: 2022-06-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems such as the complicated filling process, the pressure drop of the catalyst increases with the reaction process, and easy pulverization.
[0004] To sum up, the existing iron-molybdenum-based catalysts for the oxidation of methanol to formaldehyde mostly adopt the appearance of Raschig rings, and the tablet forming process is relatively complicated, requiring professional forming equipment and supporting membrane tools
The actual filling process is also time-consuming

Method used

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  • Monolithic iron-molybdenum catalyst for preparing formaldehyde through methanol oxidation as well as preparation and application of monolithic iron-molybdenum catalyst
  • Monolithic iron-molybdenum catalyst for preparing formaldehyde through methanol oxidation as well as preparation and application of monolithic iron-molybdenum catalyst
  • Monolithic iron-molybdenum catalyst for preparing formaldehyde through methanol oxidation as well as preparation and application of monolithic iron-molybdenum catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, dissolve 55 grams of ammonium heptamolybdate in 500 milliliters of deionized water, add concentrated nitric acid (68% by mass, the same below), adjust the pH of the above dissolution to 1.7, and then heat to 60 ° C; then add 52.5 grams of Ferric nitrate was dissolved in 200 ml of deionized water, also heated to 60 ° C, under the condition of vigorous stirring (800 rpm / min), the above ferric nitrate solution was added dropwise to the acidified ammonium molybdate solution. Aging for 12 hours.

[0022] According to the size of the tubular reactor for methanol oxidation in industry (the inner diameter of the tubular reactor for methanol oxidation in industry is 20 mm and the height is 1000 mm), a metal copper corrugated mesh with an open cross-flow structure with an outer diameter of 19 mm and a length of 1000 mm is selected as the whole First, spray a layer of urea-formaldehyde resin adhesive on the surface of the carrier, the thickness is controlled at 0.01mm, and ...

Embodiment 2

[0025] Example 2: Different Support Types (Metallic Copper Open Cell Foam)

[0026] First, dissolve 55 g of ammonium heptamolybdate in 500 ml of deionized water, then add concentrated nitric acid (68% by mass), adjust the pH of the above dissolution to 1.7, and then heat to 60°C; then dissolve 52.5 g of ferric nitrate To 200 ml of deionized water, also heated to 60 ° C, under the condition of vigorous stirring (800 rpm / min), the above ferric nitrate solution was added dropwise to the acidified ammonium molybdate solution, and then aged at 90 ° C for 12 Hour.

[0027] According to the size of the tubular reactor for methanol oxidation in industry (the inner diameter of the tubular reactor for methanol oxidation in industry is 20 mm and the height is 1000 mm), a metal copper open cell foam with an outer diameter of 19 mm and a length of 1000 mm is selected as the integral carrier. In the electrostatic spraying method, firstly, spray a layer of urea-formaldehyde resin adhesive o...

Embodiment 3

[0028] Example 3: Different carrier types (honeycomb copper-aluminum alloy monazite)

[0029] First, dissolve 55 g of ammonium heptamolybdate in 500 ml of deionized water, then add concentrated nitric acid (68% by mass), adjust the pH of the above dissolution to 1.7, and then heat to 60°C; then dissolve 52.5 g of ferric nitrate To 200 ml of deionized water, also heated to 60 ° C, under the condition of vigorous stirring (800 rpm / min), the above ferric nitrate solution was added dropwise to the acidified ammonium molybdate solution, and then aged at 90 ° C for 12 Hour.

[0030] According to the size of the tubular reactor for methanol oxidation in industry (the inner diameter of the tubular reactor for methanol oxidation in industry is 20mm and the height is 1000mm), honeycomb copper-aluminum alloy monazite with an outer diameter of 19mm and a length of 1000mm is selected as the integral carrier , Using electrostatic spraying, firstly spray a layer of urea-formaldehyde resin a...

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Abstract

The invention relates to a preparation method and application of an integral iron-molybdenum catalyst for preparing formaldehyde through methanol oxidation. A metal framework material with rapid heat conduction performance is used for loading iron-molybdenum catalytic active components. And the heat-conducting property of the catalyst system can be effectively improved, so that the hot-spot temperature in the reaction process is effectively reduced, the loss of the molybdenum component is slowed down, and the service life of the catalyst is prolonged. The integral iron-molybdenum catalyst can be applied to oxidation processes such as preparation of formaldehyde by methanol oxidation, and has relatively high application value due to longer service life.

Description

technical field [0001] The invention belongs to the field of preparation of new catalytic materials, in particular to a preparation method of a monolithic iron-molybdenum catalyst for methanol oxidation to formaldehyde. Background technique [0002] As an important chemical raw material, formaldehyde is widely used in the chemical production process. The existing domestic formaldehyde production process is mainly based on methanol oxidation. According to the different types of catalysts used, it is divided into "silver method" and "iron molybdenum method". Compared with the "silver method", the "iron-molybdenum method" production unit has the advantages of large production capacity, low methanol consumption per unit, long service life of the catalyst, and more environmental friendliness. Therefore, in recent years, the new formaldehyde plant mostly adopts the "iron molybdenum method" production process. [0003] The appearance of the existing iron-molybdenum catalysts are...

Claims

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Application Information

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IPC IPC(8): B01J23/881C07C47/052C07C45/38
CPCB01J23/881C07C45/38C07C47/04
Inventor 王峰李书双张志鑫张健
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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