Iron-Molybdenum Catalyst
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Iron-Molybdenum Catalyst

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1、Use and characteristics

Formaldehyde synthesis catalyst is suitable for formaldehyde synthesis reaction with methanol as raw material. It has the characteristics of good activity, good stability, high selectivity and long life.


2、Catalyst physical properties

Appearance

light yellow Lassie ring-shaped cylinder

MoO3

79~83%

Fe2O3

18.0~20.0

Overall dimension

Ф4.5*1.3*2.0mm

Bulk density kg/L

0.7-0.9

Axial crush strength  N/pcs

≥140

Specific surface area m²/g

5.2-6.2


3、Description of reaction mechanism

The reaction is methanol and oxygen in the air in the shell and tube reactor iron molybdenum catalyst, the reaction temperature is controlled to 257--400 to generate formaldehyde and water reaction, this reaction is an exothermic reaction, every mole of formaldehyde will release 157KJ/mol of heat. This process achieves high formaldehyde yield and very high methanol conversion in one step reaction, without the need to recover methanol from the final product formaldehyde, formaldehyde yield of 91% or more.  

Main reaction:

CH3OH + 1/2O2 → HCHO + H2O ∆H=-157 KJ/mol

Unreacted methanol, carbon monoxide, dimethyl ether and a small amount of formic acid are counted as by-products of methanol.

Side Reaction:

CH3OH + O2 → CO + 2H2O ∆H=-393 KJ/mol

CH3OH + O2 → HCOOH + H2O ∆H=-420 KJ/mol

2CH3OH → CH3OCH3 + H2O ∆H = 24 KJ/mol

Under different operating conditions, the composition of the by-products is different. By changing the process parameters, the by-products can be minimised to achieve the best formaldehyde yield.


4、Characteristics and requirements

(1) The catalyst should be pre-treated with specific heating procedure before use to ensure the catalyst has high reaction performance.

(2) The pretreated catalyst should be kept in a closed and air-filled reactor, and the reactor should be kept in a slightly positive pressure state. Prevent pollutants from harming the catalyst.

(3) Fresh air is required to be pure. Sulfur, chlorine, dust, etc. in the air can poison the catalyst, resulting in shorter catalyst life and lower selectivity.

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