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Supported catalyst based on iron and molybdenum, and preparation and application thereof

A catalyst, supported technology, applied in molecular sieve catalysts, oxidation preparation of carbonyl compounds, physical/chemical process catalysts, etc. Effect

Active Publication Date: 2018-06-05
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

Unable to effectively control the second type of active components (Fe 2 (MoO 4 ) 3 with MoO 3 ) uniform distribution

Method used

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  • Supported catalyst based on iron and molybdenum, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 50.7mL tetrapropylammonium hydroxide solution and 91mL 0.5mol / L tetrapropylammonium hydroxide aqueous solution into a 250mL round bottom flask, stir and hydrolyze at 35°C for 12h to obtain a silicon source precursor solution; add 2mL tetrabutyl titanate The ester was dissolved in 40 mL of 0.5 mol / L tetrapropylammonium hydroxide aqueous solution, stirred and hydrolyzed at 40° C. for 30 min to obtain a titanium source precursor solution. The above titanium source solution was added to the previous silicon source precursor solution. Dissolve 1.0 g of ferric nitrate in 50 mL of deionized water; dissolve 0.66 g of ammonium molybdate in 25 mL of deionized water. The above two iron-molybdenum salt solutions were added dropwise to the previously prepared mixed solution. The above mixed solution was transferred to a crystallization kettle lined with polytetrafluorotetraene and crystallized at 200°C for 72h. After the crystallization was completed, it was separated by sucti...

Embodiment 2

[0017] Embodiment 2: different molybdenum-iron atomic ratios (Mo / Fe=6.5)

[0018] Add 50.7mL tetrapropylammonium hydroxide solution and 91mL 0.5mol / L tetrapropylammonium hydroxide aqueous solution into a 250mL round bottom flask, stir and hydrolyze at 35°C for 12h to obtain a silicon source precursor solution; add 2mL tetrabutyl titanate The ester was dissolved in 40 mL of 0.5 mol / L tetrapropylammonium hydroxide aqueous solution, stirred and hydrolyzed at 40° C. for 30 min to obtain a titanium source precursor solution. The above titanium source solution was added to the previous silicon source precursor solution. Dissolve 1.0 g of ferric nitrate in 50 mL of deionized water; dissolve 2.9 g of ammonium molybdate in 50 mL of deionized water. The above two iron-molybdenum salt solutions were added dropwise to the previously prepared mixed solution. The above mixed solution was transferred to a crystallization kettle lined with polytetrafluorotetraene and crystallized at 200°C f...

Embodiment 3

[0019] Embodiment 3: different molybdenum-iron atomic ratios (Mo / Fe=2.5)

[0020] Add 50.7mL tetrapropylammonium hydroxide solution and 91mL 0.5mol / L tetrapropylammonium hydroxide aqueous solution into a 250mL round bottom flask, stir and hydrolyze at 35°C for 12h to obtain a silicon source precursor solution; add 2mL tetrabutyl titanate The ester was dissolved in 40 mL of 0.5 mol / L tetrapropylammonium hydroxide aqueous solution, stirred and hydrolyzed at 40° C. for 30 min to obtain a titanium source precursor solution. The above titanium source solution was added to the previous silicon source precursor solution. Dissolve 1.0 g of ferric nitrate in 50 mL of deionized water; dissolve 1.1 g of ammonium molybdate in 50 mL of deionized water. The above two iron-molybdenum salt solutions were added dropwise to the previously prepared mixed solution. The above mixed solution was transferred to a crystallization kettle lined with polytetrafluorotetraene and crystallized at 200°C f...

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Abstract

The invention relates to a preparation method and application for a supported catalyst based on iron and molybdenum. The supported catalyst based on iron and molybdenum is prepared by simultaneously introducing soluble iron salt and a molybdenum salt precursor in the process of preparing a titanium silicate molecular sieve (TS-1), so accurate control of distribution of two active components of Fe2(MoO4)3 and MoO3 in the channels of the TS-1 is realized. The TS-1 is used as a carrier, is a highly-efficient oxidation catalyst at the same time, and forms a synergistic effect with iron and molybdenum components. According to the invention, by using of the catalyst provided by the invention, highly-efficient conversion of methanol can be realized under the conditions of normal pressure, a reaction temperature of 250 to 400 DEG C, an inlet methanol volume content of 0.5 to 15% and a carrier space velocity of 5000 to 25000 h<-1>. The preparation method provided by the invention has simple operation, facilitates amplification, can be applied to the fields of production of formaldehyde by methanol oxidation, etc., and has good industrial application prospects.

Description

technical field [0001] The invention belongs to the field of preparation of novel catalytic materials, in particular to a supported iron-molybdenum-based catalyst (MoO 3 -Fe 2 (MoO 4 ) 3 / TS-1) preparation method. Background technique [0002] As an important bulk basic chemical product, formaldehyde is widely used in chemical, pharmaceutical and other fields. In the existing industrial production of formaldehyde in my country, methanol oxidation is the main method. According to the catalyst used, it is divided into "silver method" and "iron molybdenum method". Compared with the "silver method", the "iron-molybdenum method" adopts a fixed-bed process in terms of technology, the device has a larger production capacity, a higher conversion rate of methanol, and the reaction temperature is low, the unit consumption of methanol is small, and it can produce high-concentration formaldehyde, etc. . Therefore, in recent years, most of the new and expanded formaldehyde plants ...

Claims

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Application Information

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IPC IPC(8): B01J29/89C07C45/29C07C47/052
CPCB01J29/89B01J2229/186C07C45/29C07C47/04
Inventor 王峰李书双
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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