The catalyst for the purification of gaseous emissions of carbon monoxide

 

The invention relates to catalysts for the purification of gaseous emissions from toxic impurities, in particular carbon monoxide, and may find application in chemical, energy, machine building and automotive industries. The objective of the invention is to provide a catalyst for purification of gaseous emissions of carbon monoxide with high activity in a wide temperature range. This object is achieved in that the catalyst for purification of gaseous emissions of carbon monoxide contains the following components, wt.%: the chromium oxide 41,058.0; iron oxide 25,031,0; zinc oxide 16,527,5; silicon oxide 0,30,4; cobalt oxide of 0.10,2. Advantages of the proposed catalyst in comparison with the prototype are more high activity, low temperature oxidation of carbon monoxide at a high flow rate, wide operating temperature range, the efficiency of use of zinc oxide in comparison with copper oxide. table 1.

The invention relates to catalysts for the purification of gaseous emissions from the machine, automotive industries.

Known catalyst for the purification of gaseous emissions from the carbon oxide containing platinum and palladium in the amount of 0.25-0.5 wt.% on ball aluminosilicate (USSR Author's certificate 166656, IPC 01 J 23/40, 1965).

The disadvantages of the known inventions are the contents as the active phase of scarce and expensive platinum group metals and low stability (travlemate water, ammonia).

Also known catalyst for the purification of gaseous emissions containing oxides of copper, chromium, calcium, phosphorus, aluminum, talc and graphite, bismuth oxide or barium oxide in the following ratio, wt.%: oxide copper 27,531,0; chromium oxide 92,325,0; calcium oxide 1,61,8; phosphorus oxide 16,518,4; oxide of bismuth 0,94,0; talc 5,87,2; graphite 4,45,4; aluminum - rest (USSR author's certificate 954100, IPC B 01 J 23/78, BI 32, 1982). The maximum activity of the catalyst 90% is achieved at a temperature of 500oC.

The disadvantages of the known invention are thermal instability Vovinam new less active compounds.

The closest in technical essence and the achieved result is a catalyst for the purification of gaseous emissions of carbon monoxide, containing oxide of copper, oxides of chromium, cobalt, iron in the following ratio, wt.%: oxide copper 1,1359,0; chromium oxide 0,2536,8; cobalt oxide 0,3636,5; iron oxide 1,178,5 (USSR Author's certificate 521925, IPC 01 J 23/86, 1976).

The disadvantages of the known inventions are not high enough activity, poisoning by impurities of sulfur, lead.

The task of the claimed invention is to provide a catalyst for purification of gaseous emissions of carbon monoxide with high activity in a wide temperature range.

This object is achieved in that the catalyst for purification of gaseous emissions of carbon monoxide contains the following components, wt.%: the chromium oxide 41,058.0; iron oxide 25,031,0; zinc oxide 16,527,5; silicon oxide 0,30,4; cobalt oxide of 0.10,2.

Introduction to the catalyst of zinc oxide together is the quality of the media used by non-deficient and low-cost silicon oxide.

For a better understanding of the invention is an example.

The technological process of preparation of the catalyst for purification of exhaust gases from carbon monoxide includes the following stages: preparation of components, component preparation (mixture components), forming elements of the catalyst, drying the catalyst, the activation of the catalyst.

Iron oxide (III) (GOST 4173-77) - 25 g mixed with 0.1 g of cobalt oxide (II) (GOST 4467-79) and 0.3 g of silicon oxide (GOST 9428-73), after which this mixture is heated to 500-600oC. Then the mass is cooled to room temperature (25-30oC) and, successively adding thereto 20 g of zinc oxide (II) (GOST 10262-73) and 25 g of chromium oxide (III), thoroughly mixed mixture. Then to the resulting composition, water is added at the rate of 300 ml per 1 kg of the resulting mixture of oxides, add polyacrylamide (10 g per 1 kg of the resulting mixture) that perform the function of a temporary binder. Then the resulting mixture was incubated for 24 hours at room temperature and then forced through a Spinneret to obtain pellets (diameter of about 3-5 mm). These granules are dried at 80-90oC for 2-3 h, and then subjected to activation, which fanned the current hcpa the STU is oxidized to gaseous products (water vapor, nitrogen and carbon dioxide), receding together with the air flow from being activated mixture of oxides). Once activated, the product is cooled to room temperature.

Other examples are similar.

The catalyst activity is determined in a quartz reactor with a diameter of 18 mm and a length of 300 mm under the following conditions: concentration of carbon monoxide 3 vol.%; the oxygen content in the air 6 vol.%; gas velocity of 0.83 m/s; gas temperature 200350oC; the carrier gas is air. The content of carbon monoxide in the exhaust gas before and after the reactor is determined using the Eclipse brand 121-FA.

Resistance to the effects of toxic substances was determined by the method of US Automotive industry. 1995 8, page 33).

Physico-chemical characteristics of the inventive catalyst and the prototype presented in the table.

As can be seen from the table, the proposed catalyst in the following ratio, wt.%: the chromium oxide 41,058,0, iron oxide 25,031,0, zinc oxide 16,527,5, the silicon oxide 0,30,4, cobalt oxide of 0.10,2; flow rate 30000 h-1and those whom icewall to the effects of toxic substances (8,0-15,0%).

When using the catalyst leaving the stated interval, the maximum degree of oxidation of carbon monoxide was 89,0-93,0%.

Advantages of the proposed catalyst in comparison with the prototype are more high activity, low temperature oxidation of carbon monoxide at a high flow rate, wide operating temperature range, the efficiency of use of zinc oxide in comparison with copper oxide.

Claims

The catalyst for the purification of gaseous emissions of carbon monoxide, containing the oxides of chromium, iron and cobalt, characterized in that it additionally contains zinc oxide, silicon oxide in the following ratio, wt. %: Chromium oxide - 41,058,0 iron Oxide - 25,031,0 zinc Oxide - 16,527.5 silicon Oxide - 0,30.4 cobalt Oxide is 0.10,2

 

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