Catalyst for methanol oxidation to formaldehyde and preparation method thereof

A methanol preparation and catalyst technology, which is applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as shortening catalyst life, and improve activity and stability. , the effect of slowing down volatilization and prolonging life

Active Publication Date: 2020-07-24
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above prior art, the valence state of iron and molybdenum is at the highest by adding additives or oxidizing agents to improve the activity of the catalyst. From the analysis of the deactivation reason of the catalyst, the oxidation of iron increases, and the existence of iron oxide can inhibit the catalyst. activity, shorten catalyst life

Method used

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  • Catalyst for methanol oxidation to formaldehyde and preparation method thereof
  • Catalyst for methanol oxidation to formaldehyde and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] With 64.41g ammonium heptamolybdate (chemical formula is (NH 4 ) 6 Mo 7 o 24 4H 2 O) be dissolved in 365g pure water to obtain solution A. With 96.5g ferric chloride (chemical formula is FeCl 3 ·6H 2 O) be dissolved in 357g pure water to obtain solution B. With 1.27g rubidium chloride (chemical formula is RbCl), 0.86g cesium carbonate (chemical formula is Cs 2 CO 3 ), 8.47g magnesium chloride (chemical formula is MgCl 2 ·6H 2 O), 2.43g strontium chloride (chemical formula is SrCl 2 ·6H 2 O), 4.96g cerium nitrate (chemical formula is Ce(NO 3 ) 3 ·6H 2 O) be dissolved in 1000g pure water, join in the reactor as still bottom liquid. Keep the temperature of the solution in the kettle at 80°C, add solution B and solution A into the reaction kettle concurrently while stirring, adjust the pH to 3 with ammonia water during the precipitation process, and keep stirring at 80°C for 28 hours after the precipitation is completed.

[0047] Filter and wash to obtain 23...

Embodiment 2

[0054] With 97.44g ammonium dimolybdate (chemical formula is H 8 Mo 2 N 2 o 7 ) was dissolved in 573g of pure water to obtain solution A. With 38.6g ferric chloride (chemical formula is FeCl 3 ·6H 2 O) be dissolved in 140g pure water to obtain solution B. 0.3g strontium chloride (chemical formula is SrCl 2 ·6H 2 O) be dissolved in 1000g pure water, join in the reactor as still bottom liquid. Keep the temperature of the solution in the kettle at 80°C, add solution B and solution A into the reaction kettle concurrently while stirring, adjust the pH to 2.1 with ammonia water during the precipitation process, and keep stirring at 70°C for 24 hours after the precipitation is completed.

[0055] Filter and wash to obtain 178.54 g of filter cake, add 8.93 g of propylene glycol aqueous solution (50 wt%), stir evenly, dry at 90° C. for 24 hours, and then dry at 200° C. for 24 hours.

[0056] After drying, blocky solids were obtained, which were crushed to obtain 58.7 g of 30-6...

Embodiment 3

[0062] With 60.01g molybdenum trioxide (chemical formula is MoO 3 ) was dissolved in 417g of pure water to obtain solution A. With 108.22g ferric nitrate (chemical formula is Fe(NO 3 ) 3 9H 2 O) be dissolved in 270g pure water to obtain solution B. With 0.35g rubidium nitrate (chemical formula is RbNO 3 ), 0.72g strontium nitrate (chemical formula is Sr(NO 3 ) 2 ), 0.31g cerium carbonate (chemical formula is Ce(CO 3 ) 3 ·3H 2 O) be dissolved in 1000g pure water, join in the reactor as still bottom liquid. Keep the temperature of the solution in the kettle at 65°C, add solution B and solution A into the reaction kettle concurrently while stirring, adjust the pH to 1.5 with ammonia water during the precipitation process, and keep stirring at 70°C for 12 hours after the precipitation is completed.

[0063] Filter and wash to obtain 204.28 g of filter cake, add 13.92 g of hexanediol aqueous solution (50 wt%), stir evenly, dry at 70° C. for 24 hours, and then dry at 200° ...

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Abstract

The invention relates to a catalyst for methanol oxidation to formaldehyde and a preparation method thereof. The catalyst is an oxide catalyst containing iron and molybdenum, and one or more metal oxides of rubidium, cesium, magnesium, strontium and cerium are added, which can reduce the oxidation reaction temperature and increase the stability of the catalyst. The catalyst is prepared by a co-precipitation method, and a moisturizing agent is added in the drying step of the preparation. Adding a moisturizing agent in the drying step of the preparation process can make the catalyst better form iron molybdate crystals and reduce free iron ions, thereby improving The activity and stability of the catalyst prolong the life of the catalyst. The catalyst prepared by the method has wide application prospects in industry.

Description

technical field [0001] The invention relates to a catalyst for methanol oxidation to formaldehyde and a preparation method thereof. Background technique [0002] Formaldehyde is an important basic organic chemical raw material, which plays a decisive role in the adjustment of future energy structure and the development of chemical industry. Modern industrial formaldehyde is mainly produced by methanol oxidation. Catalysts used in the industrial production of formaldehyde mainly include silver catalysts and iron-molybdenum catalysts. Since iron-molybdenum catalysts were used to oxidize methanol to formaldehyde in 1952, they have been widely used because of their low reaction temperature and high yield. [0003] There are many existing patents on the production of formaldehyde by iron-molybdenum catalysts, such as US3846341, which is a gel catalyst of two components of iron-molybdenum. The catalyst described in US3408309 is an oxide with a small amount of tungsten and cobalt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887B01J37/03B01J37/08C07C45/38C07C47/052
CPCB01J23/002B01J23/8872B01J37/03B01J37/088B01J2523/00C07C45/38C07C47/04B01J2523/14B01J2523/15B01J2523/22B01J2523/24B01J2523/3712B01J2523/68B01J2523/842
Inventor 尹育初乃波万毅曹传宗易光铨孙康胡进于海彬黎源华卫琦
Owner WANHUA CHEM GRP CO LTD
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