RK-05 Methanol Synthesis Catalyst

I. Uses and characteristics

RK-05 methanol synthesis catalyst is suitable for low-pressure methanol and low-pressure methanol synthesis reaction with coal, coke oven gas, natural gas and acetylene gas as raw materials. It has the characteristics of good low-temperature activity, high conversion rate, good stability, high selectivity and long service life.

II. Composition and Physical Properties of Catalyst

1. catalyst composition

RK-05 is mainly composed of oxides of copper, zinc, aluminum, etc., of which copper oxide is 54-60%; Zinc oxide: 20-25%; 6-9% of alumina.

2. Physical properties of catalyst

Appearance: black cylinder;

Dimensions: ф 6× (4.0 ~ 4.5) mm, ф 5× (4.5 ~ 5.5) mm, or other specifications required by users.

Bulk density: 1.20 0.1kg/L.

Radial crushing strength: ≥220 N/cm (adjustable according to process requirements)

Specific surface area: 100~110 m²/g

Volume shrinkage after reduction: ≤3%

III. Basic Reaction of Methanol Synthesis The reaction of methanol synthesis is:

CO + 2H₂ = CH₃OH

CO₂ + 3H₂ = CH₃OH + H₂O

In the process of methanol synthesis, there are usually side reactions, and by-products mainly include aldehydes, ketones, ethers, olefins, alkanes, polymers, etc. The content of by-products mainly depends on catalyst selectivity, catalyst service cycle, process operation conditions, etc.

IV. Catalyst quality inspection

RK-05 methanol catalyst products are subject to quality inspection according to Q/RK.J001.06.01-2019 enterprise standard.

The catalyst activity test conditions are as follows (laboratory activity evaluation):

Catalyst loading: 4 ml

Sample size: 20~40 mesh

The activity test conditions are:

The reaction pressure is 5.0 MPa, the reaction temperature is 230℃, and the space velocity is 10000h^{- 1}.

Composition of raw material gas:

Co: 13-15%, CO₂: 3-5%, H₂: 55-65%, and the rest is inert gas.

The heat-resistant treatment conditions of the catalyst are as follows: under the above reaction conditions, the reaction temperature is raised to 400℃, otherwise, the catalyst is treated at a constant temperature for 5 hours.

The activity index (space-time yield of methanol) of RK-05 is ≥ 1.5g/ml h.

After heat resistance, the activity index (space-time yield of methanol) of RK-05 is ≥ 1.2 g/ml h.

V. Characteristics and Requirements of Catalyst

1. The catalyst has the activity of methanol synthesis only after reduction and activation before use, and proper reduction is the key to obtain high activity catalyst.

2. The reduced catalyst will burn quickly when exposed to the air, therefore, it should be passivated and cooled before unloading the catalyst to prevent the air from leaking in during use or parking for maintenance.

3. Carbonyl compounds of sulfur, chlorine, iron or nickel, unsaturated hydrocarbons, oils, etc. in the synthesis gas can poison the catalyst, resulting in catalyst deactivation, shortened service life and reduced selectivity. Therefore, it is required that the impurities in the synthesis fresh gas should be removed as required before entering the methanol synthesis system.

4. Process conditions of catalyst use:

Normal use temperature: 185-300℃

Optimum temperature: 225-280℃

Working pressure: 3- 15MPa

Operating airspeed: 4000-20000h^{- 1}

5. Requirements for impurity content in raw gas:

Total sulfur ≤ 0.1ppm; Chlorine ≤ 0.01ppm; Carbonyl ≤ 0.01ppm;

Ammonia ≤ 10 ppm; Oxygen ≤0.2%