The catalyst for deep oxidation of hydrocarbons

 

(57) Abstract:

The essence of the invention: catalyst for deep oxidation of hydrocarbons contains iron oxide or chromium solid solution based on it and platinum, deposited on a fiber, for example silica, a carrier in the form of a Mat in the following ratio, wt. %: iron oxide or chromium solid solution (Fe1-xCrx)2O3where x is from 0 to 0.2, 15 - 34; platinum 0,006 - 0,10; media - the rest. table 1.

The invention relates to chemistry, in particular to catalysts for deep oxidation of hydrocarbons, and can be used in catalytic heaters running on propane-butane mixture, or other hydrocarbons. These heaters find application in various sectors of the national economy, as well as residential areas.

Known catalysts for the combustion of fuels containing magnesium chromite, copper, zinc on a spherical aluminum oxide, but they cannot be used in catalytic heaters with fixed bed of catalyst, operating on gaseous fuels due to the high gas permeability of the layer of spherical granules.

For low-temperature catalyts Al2O3, ZrO2, TiO2, ThO2, silicates of aluminum and zirconium. The disadvantage of this catalyst is its high content of rare and expensive element Rh.

Known gas treatment catalysts containing 0.4% Pt on fibreglass, covered with two-layer substrate of silica gel and one oxide from the group of Al2O3, TiO2, ZrO2, MgO [1] the Disadvantage of this catalyst is a multi-stage process of preparation (acid washing and calcination fiber; the impregnation kremnezem, drying, calcination, impregnation with platinum compounds, drying, calcination).

The closest in technical essence and the achieved effect is the catalyst in the form of a Mat with low hydrodynamic resistance, containing 1-5 wt. Pt deposited on a substrate of Al2O3deposited in an amount up to 12% on a Mat made of quartz, ceramic or metal thread [2] the Catalyst was prepared as follows: silica fiber Mat impregnated with a colloidal solution containing particles of one of the compounds from the group of Al2O3, SiO2, ZrO2, TiO2. Then subjected to heat treatment at 340aboutWith, impregnated with a solution of colloidal Pt, dried, about the tsya high ignition temperature (140-162,5aboutWith), and improving it in the process (after 8 h 170-200aboutC); high content of Pt in the catalyst, the multistage process of cooking, especially triple heat treatment.

The problem solved by the invention increase the activity of the catalyst at lower Pt content. To solve this problem is proposed catalyst for combustion of fuels containing platinum on the fibrous carrier coated with a substrate of iron oxide or chromium solid solution based on it (Fe1-xCrx)2O3in the following ratio, wt. (Fe1-xCrx)2O3(where x is 0-0,2) 15-34 Pt 0,006-0,01 Media Else

The catalyst is prepared by impregnation of fibrous media (e.g., fiberglass) with a solution of chelated iron compounds with subsequent irrigation of its surface with a solution of platinum-hydrochloric acid, drying at room temperature for 8-12 h and calcination in air at 400aboutWith 4 hours In a solution of iron compounds if necessary add chromium nitrate.

Distinctive features of the catalyst is the content of the substrate Fe2O3or solid solution (Fe1-xCrx)1-xCrx)2O3reduces the ignition temperature, the content of Pt and to increase the stability of the catalyst. When the concentration of Fe2O3less than 15% and Pt less than 0.006%, there is a leakage of hydrocarbons and the reduction of the working temperature of the surface of the Mat. The increase in the concentration of more than 0.01% is impractical as it does not affect the process performance. The upper limit of concentration (Fe1-xCrx)2O3due to the limited solubility of iron compounds and absorption Mat. At higher concentrations of Cr in the substrate (x > >0,2) reduced operating temperature on the surface of the Mat.

Evaluation of catalytic activity of the catalysts was conducted on a laboratory bench and in the catalytic heater. When the tests are measuring the time of ignition, the ignition temperature and the maximum operating temperature on the catalyst surface. Exhaust gases analyze chromatography on carbon monoxide and hydrocarbons. The composition of combustion gas: LPG (cooking gas). The main criterion for comparing the activity of the catalysts are the time and temperature of ignition. The stability of the catalysts check to change the listed parameters during prolonged exploita in the form of a Mat thickness of 15 mm is impregnated with an aqueous solution of citric-ammonium iron (III), containing 43 mg/ml of iron, remove excess impregnating solution, irrigation is applied 2 ml of 1% aqueous solution of platinum-hydrochloric acid. The Mat is dried at room temperature for 8-12 h and calcined in air at 400aboutWith 4 hours the catalyst composition, wt. platinum 0,006; iron oxide (III) 15; the rest of the media. The results of the analysis and testing of the catalyst shown in the table.

Examples 2, 3, 4 same as example 1.

P R I m e R 5. Media in the form of a thin Mat made of fiberglass impregnated with a solution containing 88 mg/ml of iron and 20 mg/ml of chromium. Remove excess impregnating solution, then the Mat is dried and calcined as in example 1. The results of the analysis and testing of the catalyst shown in the table.

Examples 6, 7 is similar to example 5, however, the impregnated Mat irrigation applied Pt-containing solution as in example 1. The results of analysis and tests are given in the table.

Examples 8, 9, 10 are given for comparison and describe the preparation and testing of catalysts with transcendent values of the content of platinum.

P R I m e R 11 describes the preparation of a known catalyst according to [2] Mat of fiberglass impregnated with a colloidal solution, which would be 5% of precipitated alumina, impregnated with a solution of colloidal platinum. Then it is dried and calcined at 600about, Restore at 500aboutC. Obtain a catalyst of the following composition, wt. platinum 1; aluminium oxide 5; the carrier of the rest.

P R I m e R 12. Media in the form of a thin Mat made of fiberglass impregnated with a solution containing 88 mg/ml of iron and 5 mg/ml of chromium. Remove excess impregnating solution, then the Mat is dried and calcined as in example 1. The results of the analysis and testing of the catalyst shown in the table.

P R I m e p 13. Similar to example 12, but the content of chromium in the solution 10 mg/ml

P R I m e R 14. Similar to example 12, but the content of chromium in the solution 15 mg/ml

P R I m e R 15. Media in the form of a Mat of melitommatinae felt (MCH-100) is impregnated with a solution containing 88 mg/ml of iron and 20 mg/ml of chromium. Next, similarly to example 1.

P R I m e R 16. As the carrier used plates of silica fiber (KP-11). Further, similar to example 15.

The results of the tests of the catalysts shown in the table.

The CATALYST FOR DEEP OXIDATION of HYDROCARBONS containing a metal oxide and platinum on the fibrous carrier, characterized in that carmoly (Fe1-xCrx)2O3where x = 0 to 0.2, in the following ratio, wt.%:

Platinum - 0,006 - 0,010

Iron oxide or chromium solid solution based on it - 15,0 - 34,0

Media - The Rest

 

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