A method of producing a catalyst for purification of exhaust gas

 

(57) Abstract:

The invention relates to a method for producing a catalyst for purification of exhaust gas of harmful organic impurities and carbon monoxide. The required technical result is to create a cheap, environmentally friendly way to obtain high gas purification catalyst having a sufficient mechanical strength. In the proposed method of producing a catalyst for purification of exhaust gas from organic impurities and oxides of carbon, mainly on the interaction of active components and a binder, the required technical result is achieved by the fact that the interaction is carried out by mixing crushed ferromanganese nodules /Fe-mn deposits/ as active components and aluminum hydroxide structure pseudoboehmite /HA/ as a binder in the ratio of nodule field: HA=1,5:1, 10:1. Moreover, the mixture of components is proposed to make in the 6-12% solution of catalytically neutral acid at a mass ratio of acid to dry mixture of 2.5:100-4:100. 1 C.p. f-crystals.

The invention relates to a method for producing a catalyst for purification of exhaust gas of harmful organic impurities and carbon monoxide.

One Sorbency-based catalysts driving materials pyrolusite ore (1). The main disadvantage of these catalysts is the variability of composition and low mechanical strength.

A known method of producing a catalyst which is used in deep oxidation during purification from harmful organic impurities and carbon monoxide, is a method of impregnation of the carrier with a solution of salts of transition elements. Thus, to obtain a catalyst containing 26 wt. the copper oxide on the carrier of active alumina, the carrier is impregnated with a saturated solution of copper nitrate (2). The main disadvantage of this method is the large amount of nitrogen oxides emitted at the stage of calcination of the catalyst.

There is more environmentally friendly way of getting catalysts, based on the interaction of active components, which use the cations of transition metals and a binder, selected as a prototype (3). So, in this way the media (binding) alumina various modifications, impregnated with a solution of ammonium complex copper carbonate (the active ingredient).

This method also has several disadvantages, the main of which is the use of expensive synthetic componentcolormodel clean method to obtain high gas purification catalyst, with sufficient mechanical strength.

In the proposed method of producing a catalyst for purification of exhaust gas from organic impurities and carbon monoxide, based on the interaction of active components and aluminiumoxide binder, the required technical result is achieved by the fact that as the active components used crushed ferromanganese concretions, as a binder aluminum hydroxide patterns pseudolite and interaction is carried out by mixing them with the mass ratio of the nodule to the aluminum hydroxide equal to 1.5:1 and 10: 1. Moreover, the mixture of components is proposed to produce 6 12% solution of catalytically neutral acid at a weight ratio of acid to dry mixture of 2.5:100 4:100.

Consider the typical specific examples of the preparation of the catalyst.

Example 1. 60 g Powdered nodules K-1 and 6 g of the binder GAA (the ratio of nodule field:GAA 10:1) pour 8% acetic acid at a rate of 22 ml (ratio of acid and a dry mixture of 2.5:100). The resulting mixture is stirred, molded in the form of cylinders and rings, dried and calcined as in the following examples.

The activity obtained in this way catalysis the SSA is still plastic enough to form granules of the catalyst in the form of cylinders and rings. When increasing the ratio of nodule field:GAA over 10:1 dramatically reduced the rheological properties of the molding material and the catalyst loses its practical value.

Example 2. 30 g of the Powder product THA peptizer with 10 ml of acetic acid (11% ). Then type 45 g powder nodules K2 and 15 ml of the same acid (i.e., the ratio of nodule field:HA to 1.5:1, and the acid to a mixture of 3,5:100). The catalyst activity was 8,0 8,3 Specific surface area amounted to 173 m2/g, and the strength of 3-4 MPa. When the reduction ratio of the nodule field:HA less than 1.5:1 the catalytic activity of the catalyst decreases.

Example 3. 15 g Powder product THA peptizer with 10 ml of acetic acid (8% ). Then add 60 g of powder nodules K-4 and 35 ml of the same acid (ratio of nodule field:GAA 4:1, and acid and a mixture of 4:100). The activity was 8,0 8,3, specific surface area of 115 m/g, the strength of 2 MPa.

The amount of acid (e.g. acetic acid) were selected based on 1 mol per 1 mol of aluminum oxide contained in the binder. Described in the claims, the range of ratios of acid to the mixture was determined by the type of binder, the ratio of nodule field: GAA, type nodules. The range of acid concentration was determined by the requirement of obtaining the necessary rheological properties of the mixture for formy nitrogen or even stronger patinator) leads to a slight increase of the strength of the granules, but necelesobrazno, both from an economic and environmental point of view.

The reaction rate of catalytic oxidation of butane with oxygen was determined in a flow-circulation setting the PI speed feed gas mixture of 10 l/h and the stationary concentration of butane 0.2% Activity characterized by the rate of conversion of butane at a certain temperature: W102ml C3H8/HS.

In the process of testing was used nodules of the World ocean (K-1 type And the Pacific ocean, To-2 type And Indian, To-3 type And the crust of the Pacific ocean, To-4 type In the Pacific ocean, 5 Baltic sea, K-6 type With the Pacific ocean).

The method of producing catalyst is a mixture of crushed nodules and a binder in certain proportions in the presence of a catalytically neutral acid, which serves (as the best options) diluted acetic or nitric acid as patinator. Catalysts based nodules such types can be molded in the form of complex geometric shapes, in particular blocks.

Cheaper the proposed method makes use of natural raw materials nodule field.

Ferromanganese nodules contain in their with what is to be used as active ingredients for the preparation of catalysts.

As a binder used monohydrate alumina AlO(OH), (rentgenograficheski pseudoboehmite).

Aluminum hydroxide structure pseudoboehmite can be obtained by the method of resultant deposition rates (product GAA) or thermochemical activation technical hydrate of alumina (THA product). In accordance with the results of x-ray and thermogravimetric analyses presideni aluminum hydroxide (GAA) consists only of pseudoboehmite, THA product contains 65 wt. h pseudoboehmite, the rest of trihydrate, bayerite and hydro-argillite. In this regard, upon receipt of catalyst required number of GAA as a binder is less than the product of THA. However, the latter is less scarce and upon receiving it are excluded under resultant deposition rates, which appear wastewater requiring special treatment. At the same time be aware that excessive dilution of the nodules of the binder leads to loss of catalytic activity.

For the preparation of the catalyst in a paddle mixer poured a mixture of powders of nodules and binder (GAA), add acetic or nitric acid and stirred the mass for 30 to 40 minutes. When used as a binder product THA the m being powdered nodules and continue stirring 30 minutes

The activity of the catalyst on the basis of nodules in the reaction of complete oxidation is determined mainly by the presence of manganese. The most active catalysts, prepared using nodules with a high content of manganese. The activity of the catalyst also depends on the amount of binding. A significant increase in the content of GAA and THA leads to decreased activity. However, for some types of nodules increased percentage of GAA and THA from 9 to 20 and 33, respectively, does not result in loss of catalytic activity. Apparently in this case a significant effect simultaneous increase of the specific surface and porosity.

Studies have shown that the activity of catalysts on the basis of nodules in the oxidation of carbon monoxide is almost at the level of the prototype, and in the oxidation of butane is much higher. Activity in the oxidation of butane the catalysts are practically not inferior to the known catalyst based on platinum group metals. At the same time sufficient cheapness of the raw materials makes their use highly profitable in the future.

It is extremely important that the catalysts on the basis of the nodules can be formed in the form of blocks.

otulana, that is especially important when cleaning large discharges. Block catalysts can be used for cleaning dust emissions. The scope of catalysts based on iron-manganese nodules can be very wide. High specific surface area of catalysts and their high activity in low-temperature region makes them promising for devices adsorption-catalytic cleaning of ventilation gases of paint, furniture and other industries, where the main toxic components alcohols, phenols, esters contain at low concentrations.

It should be noted that the catalysts on the basis of the nodules have a relatively high water-holding capacity of 0.5 ml/kg. This allows you to easily enter by impregnation additional active components, significantly expanding the scope of the catalysts.

We have studied properties of catalysts prepared using different types of nodules and for different ratios of concretions: binding.

The range of the ratio of Fe-mn deposits and binders tested experimentally. With increasing ratio of nodule field:HA more than 10:1 dramatically reduced the rheological properties of the catalyst and it loses its practical value.

By reducing the ratio of acid to a mixture of 2.5:100 not provided high-quality components are mixed, and an increase of more than 4 per 100 does not improve the properties of the mixture.

At lower acid concentrations below 6% and increased above 12% not provided the required humidity of the mixture for the subsequent technological operations (mixing, molding, drying and sufficient strength after annealing.

1. A method of producing a catalyst for purification of exhaust gas from organic impurities and carbon monoxide by the interaction of active components and aluminiumoxide binder, characterized in that as the active components used crushed ferromanganese concretions, as a binder aluminum hydroxide structure pseudoboehmite and interaction is carried out by mixing them with the mass ratio of the nodule to the aluminum hydroxide equal to 1.5 to 1 10 to 1.

2. The method according to p. 1, characterized in that the mixing of the components is carried out in 6 to 12% solution of a catalytically neutral acid at a mass ratio of the acid and the dry mixture, equal to 2.5 100 4 1000.

 

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