A method of producing a catalyst for the oxidation of sulfur compounds in the exhaust gases

 

The invention relates to methods of producing catalysts for industrial flue gases from sulfur compounds, in particular for the oxidation of hydrogen sulfide and organic sulfur compounds to sulfur dioxide contained in the tail gas of the Claus process. The described method of preparation of the catalyst for oxidation of sulfur compounds in the exhaust gases using a binder on the basis of aluminium hydroxide with subsequent mixing with a pore-forming additives and compounds of vanadium, iron, followed by molding, drying and calcining, the binding agent is an aluminum hydroxide-based x-ray amorphous layered aluminum compounds of the formula Al2About3nH2Oh, where n= 0.3 to 1.5, and as compounds of iron using iron oxide (III), and the annealing is carried out at a temperature of 680-720oC. the Use of the proposed method in comparison with the prototype leads to an increase in mechanical strength and activity of the catalyst for the oxidation of sulfur compounds. 2 C.p. f-crystals, 1 table.

The invention relates to methods of producing catalysts for industrial flue gases from sulfur soedinivshisi gas of the Claus process.

Known catalysts for the oxidation of sulfur compounds on the basis of oxide carriers with different supplements. The most widely used vanadium-containing catalysts.

A process for the production of these catalysts include, primarily, the methods based on the carrier impregnated alumina with solutions of salts of vanadium (US 4314983, IPC 01 17/02, 1979) and iron or by impregnation using as a carrier of titanium dioxide and silicon dioxide.

However, these methods are more time-consuming and energy-intensive than the method of mixing the active components.

Closest to the claimed is a method of increasing the activity of vanadium catalyst through the use of a catalyst which contains as active ingredients compounds of vanadium, iron, and as the binder used aluminum hydroxide (RU 2064833, IPC6B 01 J 23/847, 37/04, 1996). The catalyst was prepared by mixing aluminum hydroxide with a pore-forming additives, compounds of iron, vanadium, then enter nitric acid followed by molding, drying, and heat treatment at a temperature 680-850oC.

The disadvantage of this method of preparation of the catalyst is not sufficiently high mechanical strength policenauts the development of an effective catalyst with high mechanical strength and high catalytic activity.

The task is solved by the method of producing a catalyst for the oxidation of sulfur compounds in the exhaust gases using a binder on the basis of aluminium hydroxide with subsequent mixing with a pore-forming additives and compounds of vanadium, iron, followed by molding, drying and calcining, the binding agent is an aluminum hydroxide-based x-ray amorphous layered aluminum compounds of the formula Al2About3nH2O, where n= 0.3 to 1.5, and as compounds of iron using iron oxide (III), and the annealing is carried out at a temperature of 680-720oC.

As oxygen-containing compounds of iron using iron oxide (III) with a particle size of preferably 2-3 μm.

As a pore-forming additives used wood flour with a particle size preferably less than 63 microns, or-aluminum oxide in the amount of 2-15 wt.%, or their mixture.

X-ray amorphous layered compound aluminum get in the way of rapid dehydration of gibbsite.

In the proposed method in contrast to the known proposed to use a binder on the basis of x-ray amorphous layered aluminum compounds of the formula AloC., the temperature of calcination above 720oWith leads to a decrease in the strength of the catalyst and its activity.

Feature of the method of preparation of the catalyst is the simultaneous formation of both the structure of the carrier Al2About3and active component in the form of vanadium compounds and iron as rise in temperature to 680-720oC. And defective structure of layered x-ray amorphous aluminum compounds of the formula Al2About3nH2O, where n= 0,3-1,5 promotes active component with high variance, which increases as the activity of the catalyst in the oxidation of sulfur compounds and increase the mechanical strength of the catalyst due to the formation of stronger linkages particles of the active component with the surface of the aluminum oxide.

High dispersion of the active component can significantly reduce the temperature of calcination of the catalyst than aemula phase composition active at lower temperatures.

Thus, the method of producing catalyst can significantly increase the strength of the catalyst and the catalytic activity.

The method is as follows.

The aluminum hydroxide-based layered x-ray amorphous compounds of the formula Al2About3mo2Oh, where n=0,3-1,5 mixed with compounds of vanadium, iron oxide (III), a pore-forming additive, formed into pellets of the desired shape, dried and calcined at a temperature of 680-720oC.

Get the catalyst containing uniformly distributed in the aluminum oxide compounds of iron and vanadium in terms of metal, wt.%: Iron - 1-3,5 vanadium - 1-3,5 Catalytic activity was determined in a flow laboratory setup at atmospheric pressure in the oxidation of hydrogen sulfide at a temperature of 30015oWhen the contact time of 0.3 s and the contents of the source components in the gas mixture (about. share) H2S - 1,0%, SO2- 1,0, O2to 5.0%, N2O - 20,0 %, nitrogen - rest (grain size 4 mm).

Analysis of the initial mixture and of the final products was performed using the chromatography LHM-MD and Gazprom-3101.

In the examples describing the method, the data on activity, vyhsivanie developed catalyst.

Conditions of preparation of the catalyst shown in the table.

The invention is illustrated by the following examples.

Example 1 (the prototype).

To 280 g binder - aluminum hydroxide past termomekhanicheskoe processing, add 40 g of pore-forming additives --aluminium oxide, salt of iron and vanadium pentoxide powder. Mix the dry ingredients for 10 minutes Then add a solution of nitric acid in water (10 ml concentrated nitric acid in 150 ml of water). Stirred for 15 minutes Then a lot ekstragiruyut, dried, calcined at a temperature of 850oC for 2 h

Example 2.

To 280 g binder - aluminum hydroxide-based x-ray amorphous compounds of the formula Al2About30,65 H2About add nitric acid, compound V2O5and Fe2About3with a particle size of 2-3 microns.oxide of aluminum, wood flour with a particle size less than 63 μm, the components are stirred for 15-20 min, molded into pellets of catalyst spherical shape with a diameter of 5 μm, dried and calcined at a temperature of 680oC.

The content of iron in the catalyst is 1 to 3,5%, the content of van is 0,75 H2Of contents-aluminium oxide is 15 wt.%.

Example 4.

Similar to example 2, only use a binder based Al2About30,85 H2Oh and the particle size of wood flour is 63 μm.

Example 5 (zapredelnyj example).

Similar to example 2, the temperature of calcination 600oC.

Example 6 (beyond the example).

Similar to example 2, the temperature of calcination is equal to 800oC.

Example 7.

Similar to example 2, only as a pore-forming additives introduced wood flour in an amount of 5 wt.%.

Example 8.

Similar to example 2, only the size of the particles of iron oxide (III) is 5 μm, and using a binder based Al2About31,5 H2O.

Example 9.

Similar to example 2, only the content proobrazuya additives is:-Al2O37 wt.%, wood flour - 3 wt.%.

Example 10.

Similar to example 2, only the content of the pore-forming additives-Al2About3equal to 2 wt.% and the temperature of annealing is equal to 710oC.

As seen from the above examples, the proposed method is simple on the people and activity.

As follows from the table, when the temperature of annealing the use of the claimed binding activity of the catalyst decreases, and when the temperature of the annealing loss of strength of the catalyst. The reduction in the number of pore-forming additives leads to deterioration of the porous structure of the catalyst by reducing the volume of transport pores, which reduces the activity of the catalyst, when the number of pore-forming additives decreases the strength of the catalyst by increasing the volume of large pores.

To make the active ingredients are dry vanadium compounds and iron oxide (III).

As of vanadium compounds used is preferably an oxide of vanadium (V). As iron compounds using iron oxide (III), preferably with a particle size of 2-3 microns.

Thus, the preparation of the catalyst according to the proposed method allows to obtain a catalyst with high mechanical strength and high catalytic activity.

Technology of preparation of the catalyst is simple, the optimal porous structure of the catalyst, and the phase structure of the carrier and the active ingredient are formed in the cooking process katalizatorami, as well as the activity of the catalyst oxidation of sulfur compounds.

Claims

1. A method of producing a catalyst for the oxidation of sulfur compounds in the exhaust gases using a binder on the basis of aluminium hydroxide with subsequent mixing with a pore-forming additives and compounds of vanadium, iron, followed by molding, drying, and calcination, wherein the used binder constituting the aluminum hydroxide-based x-ray amorphous layered aluminum compounds of the formula Al2About3mo2Oh, where n= 0.3 to 1.5, and as compounds of iron using iron oxide (III), the calcination is carried out at a temperature of 680-720oC.

2. The method according to p. 1, characterized in that use iron oxide (III) with a particle size of 2-3 microns.

3. The method according to p. 1, characterized in that as a pore-forming additives used wood flour with a particle size less than 63 μm in the amount of 3-5 wt. %, or-aluminum oxide in the amount of 2-15 wt. per cent, or their mixture.

 

Same patents:
The invention relates to methods for Nickel-alumina-chromium catalysts used for hydrogenation processes, gas purification, for processes mahanirvana carbon oxides
The invention relates to the synthesis of the catalysts used, in particular, for the conversion of hydrocarbons into high-level components of motor fuels, aromatic hydrocarbons
The invention relates to the field of chemistry, and in particular to methods of preparation of catalysts for the conversion of light hydrocarbons to high octane motor fuel components

The invention relates to the production of ion exchangers molded catalysts used in organic synthesis

The invention relates to a method for producing a catalyst for the (AMM)oxidation of propane or propylene to Acrylonitrile

The invention relates to catalysts and methods of producing the oxide catalysis

The invention relates to catalysts and methods of producing oxide catalysts used in the processes of deep oxidation of organic compounds and carbon monoxide in the gas emissions from industrial productions
The invention relates to a method for producing a tin-containing vanadium-antimony catalysts suitable for the catalytic ammoxidation3-C5-paraffins or olefins, more specifically, to obtain catalysts for the ammoxidation of propane or isobutane, or propylene, or isobutylene with obtaining the appropriate,-unsaturated mononitriles, Acrylonitrile or Methacrylonitrile

The invention relates to the field of inorganic chemistry and can be used in particular for the preparation of the catalyst used for the decomposition of ozone in production with his participation, for the purification of gas mixtures of carbon monoxide, as well as for other industrial and environmental purposes

The invention relates to chromium catalysts and methods for their preparation used for oxidation of organic compounds, hydrogen and carbon monoxide in the gas emissions from industrial productions

The invention relates to the production of catalysts for the dehydrogenation of alkyl benzenes to obtain monomers used in the production of rubbers and plastics

The invention relates to the field of catalysis, in particular can be used for purification of exhaust gases of thermal power plants from sulfur dioxide

The invention relates to catalysts for the protection of the environment from the toxic emissions of nitrogen oxides and can be used in power, chemical, metallurgical and other industries, with exhaust gases containing nitrogen oxides

The invention relates to an improved process for the preparation of aniline by hydrogenation of nitrobenzene and can be used in the manufacture of dyes, as well as in the petrochemical industry for the hydrogenation of nitro compounds to primary amines used in the manufacture of caprolactam

The invention relates to an improved process for the preparation of aniline by hydrogenation of nitrobenzene in the vapor phase and can be used in the manufacture of dyes, as well as in the petrochemical industry for the hydrogenation of nitro compounds to primary amines used in the manufacture of caprolactam

The invention relates to the field of catalysis, in particular can be used for cleaning hymovich gases of thermal power plants from SO2

The invention relates to methods of producing catalysts for industrial flue gases from sulfur compounds, in particular for the oxidation of hydrogen sulfide and organic sulfur compounds to sulfur dioxide contained in the tail gas of the Claus process

The invention relates to the process of obtaining mixtures of hydrogen and carbon monoxide by catalytic conversion of hydrocarbons in the presence of oxygen-containing gases and/or water vapor

The invention relates to the production of catalysts for processing of hydrocarbon raw materials and can be used in the process of hydrodealkylation benzene-toluene-xylene (BTX) fraction allocated from the pyrolysis condensate fraction in the pyrolysis of hydrocarbons and toluene hydrodealkylation

The invention relates to catalytic chemistry, in particular to methods of producing catalysts for the process of reduction of nitrogen oxides, mainly in the presence of methane and oxygen, and can be used for purification of exhaust gases (NOx) in the production of weak nitric acid, flue gases of high-temperature furnaces and boilers
Up!