Catalyst for oxidation of carbon monoxide

 

(57) Abstract:

The invention relates to the field of oil refining, in particular the catalysts for oxidation of carbon monoxide into carbon dioxide in the catalytic cracking processes. The catalyst contains 0,02 - 0,07% platinum, 0.2 to 16% of oxides of rare earth elements and up to 100% alumina. The catalyst has a high activity, which can reduce the temperature in the regeneration zone of the cracking catalyst. table 1.

The invention relates to the refining, in particular to obtain a catalyst used in catalytic cracking processes for the oxidation of carbon monoxide in the volume of the regenerator.

Effective and reliable way of afterburning of CO to CO2in the volume of the regenerator is the regeneration of cracking catalyst in the presence of promoting additives oxidation catalysts [1, 2] the Most effective catalyst for the oxidation of CO are the platinum group metals deposited on an inert carrier [3]

Well-known domestic catalysts for the oxidation of CO to CO2[4] manufactured under the brand names of KO-9, Oxiperm-2, OTF-1. Depending on the brand, the catalysts contain 0.05 to 0.08 wt. platinum and the remainder alumina. Katalysatoren is the catalyst CF-3 [4] the company Duvison Chemical, containing 0.07 wt. plate, the rest of the aluminum oxide of high frequency with a specific surface area of 100 m2/,

All known catalysts are prepared by impregnation of a microspherical alumina with a solution of a platinum compound.

Lack of catalysts KO-9, Oxiperm, CP-3 is their low bulk density, which increases the consumption of the catalyst due to its ash from the system of the regenerator. A common shortcoming of all existing catalysts for the oxidation of CO to CO2is their high operating temperature. The required conversion of CO to CO2achieved in the regeneration zone at 600-660oC, which accelerates deterioration of the equipment, with a low content of coke on the cracking catalyst requires additional heat input, and reduces the activity and reduces the service life of the catalyst for cracking and oxidation.

Closest to the proposed catalyst is the catalyst of OTF-1, containing technical alumina and 0.05 wt. platinum [4]

The purpose of the invention increase the oxidation activity of the catalyst.

The aim is achieved in that the catalyst additionally contains oxides of rare earth elements (RSO) and has the following chemical composition, wt.

Pt 0,02-0,07

RSO 0,2-1,5

Al2O3Else

The specified contrast allows you to increase the oxidation activity of the catalyst and reduce its temperature by 50 to 100oC.

The catalyst is prepared by impregnation of technical grades of aluminium oxide G-OS (GOST 6912-87) or GUM (TU 48-0101-7/0-90) a solution containing platinum and rare earth elements (REE), followed by drying of the product or sequential impregnation of the support dissolution of the active components with intermediate and final drying of the product.

For preparation of the impregnating solutions used cerium concentrate on WUT-6685-01-71 (solution of nitrates of rare-earth elements) and a solution of hexachloroplatinic acid containing 1.0 g/l of platinum.

Example 1. In the mixer propitiating load of 200 g of dry alumina G-00 with a particle size of 0.05-0.10 mm and impregnated with stirring, 100 ml of a solution containing 0.1 g of Pt and 0.4 g of oxide of rare earth elements. The mass is stirred for 1-5 min, unloaded and dried in an oven at 120-140oC for 4-5 h

Get the catalyst, wt.

Pt 0,05

RSO 0,2

Get the catalyst, wt.

Pt 0,05

RSO 0,8

Al2O3Else

Example 3. The catalyst prepared according to example 1, but the impregnating solution contains 0.1 g of Pt and 3 g of oxides of rare earth elements.

Get the catalyst, wt.

Pt 0,05

RSO 1,5

Al2O3Else

Example 4. The catalyst prepared according to example 1, but the impregnating solution contains 0.04 g of Pt and 1.6 g of oxides of rare earth elements.

Get the catalyst, wt.

Pt 0.02

RSO 0,8

Al2O3Else

Example 5. The catalyst prepared according to example 1, but impregnating solution containing 0.14 g of Pt and 1.6 g of oxides of rare earth elements.

Get the catalyst, wt.

Pt 0,07

RSO 0,8

Al2O3Else

Example 6. The catalyst prepared according to example 1, but the impregnating solution contains 0.1 g Pt.

Get the catalyst (the prototype), wt.

Pt 0,06

Al2O3Else

Example 7. The catalyst prepared according to example 1, but the impregnating solution contains 1.5 grams of oxides of rare earth elements.

Get the catalyst, wt.

RSO 0,8

Al2O3Else

The catalysts according to examples which are of high oxidative activity of the proposed catalyst compared to the prototype. High oxidative activity is achieved due to the composition of the proposed catalyst, since the catalyst containing only platinum or RSO (examples 6 and 7) high activity do not possess. It should be noted that at 30% activity and above according to this method, almost complete afterburning of CO in the regeneration of cracking catalyst at industrial installations.

The catalyst eliminates the above disadvantages of existing catalysts oxidized and significantly improve the efficiency of catalytic cracking.

Catalyst for oxidation of carbon monoxide to dioxide containing platinum and alumina, characterized in that it further comprises the oxides of rare earth elements in the following ratio, wt.

Platinum 0,02 0,07

The oxides of rare earth elements 0,2 1,5

The aluminum oxide To 100,

 

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