SU795441A3 - Method of producing catalyst for purification of gases containing organic and inorganic compounds - Google Patents

Abstract

1494484 Catalytic coatings INST. CIEZKIEJ SYNTEZY ORGANICZNEJ "BLACHOWNIA" 20 Nov 1974 [28 Nov 1973] 50231/74 Headings B1E and B2E Catalytic material e.g. for oxidation of noxious gases is prepared by (i) forming a non-gel aqueous colloidal dispersion of aluminium hydroxide containing from 0.05 to 10 per cent weight of solid material (calculated as alumina) and introducing thereinto a noble metal or noble metal compound of group VIII of the Periodic Table, and (ii) applying a coating of the resulting composition to carrier material. The noble metal component may be colloidal platinum, colloidal platinum compounds, chloroplatinic acid, teramino platinic chloride, ammonium chloroplatinate or palladium salts. From 0.01 to 10% wt. (based on alumina) of a compound of Re, W, Mo, Cr, V, Ti, Zr, Nb or Cd may be added to modify the properties of the composition and a stabilizer for the colloidal dispersion may be added, e.g. arabic gum, lysalbinic acids, gelatine, starch, silica or alkaline earth compounds. The composition may further contain a compound to improve adhesion to the carrier, e.g. one containing chloride, nitrate, fluoride, borate or phosphate ions. The carrier may be a metal or metal alloy or an oxide. The examples describe the application to metallic or oxidic carriers of compositions comprising aluminium hydroxide and (i) palladium chloride, platinum sulphide and arabic gum, (ii) chloroplatinic acid, cadmium chloride and chromium chloride; (iii) Keller's complexing agent, ammonium perhenate and niobium pentafluoride: (iv) iridium chloride, ammonium chloroplatinate and gelatine; (v) colloidal platinum, silica and calcium nitrate; and (vi) chloroplatinic acid, zirconium nitrate and silica.

Description

(54) METHOD FOR OBTAINING A CATALYST FOR CLEANING GASES CONTAINING ORGANIC AND INORGANIC

1 CONNECTIONS

colloidal platinum, or a platinum compound, or a complex compound of platinum and the additives listed above / at the content of the components.

As a result of using the present method of catalyst preparation, a catalyst is obtained which, when purifying air contaminated with ethylene, carbon monoxide, carbon disulfide and hydrogen sulfide, has a conversion of 90-98% at 250-300 ° C. Thus, its activity is increased in comparison with the catalyst obtained in a known manner by 28-58%.

Below are examples of the implementation of the present method for the preparation of the catalyst.

Example 1. In 40 g of aluminum hydroxide obtained by hydrolysis of aluminum isopropyl in 1 l of water, 2 g of concentrated nitric acid and 0.1 g of gum arabic dissolved in 20 ml of water were added. In the solution thus obtained, 0.004 g of palladium in the form of palladium chloride and 0.004 g of platinum in the form of colloidal platinum sulfide are added. After stirring at room temperature, a homogeneous, strongly opalescent mass is obtained containing 2 wt.% Alumina, 0.0003 wt.% Palladium and 0.0003 wt.% Platinum.

The colloidal solution obtained in this way was deposited on the aluminum OXID product in the form of balls with a diameter of 7, and after calcining a finished catalyst was obtained consisting of 92% by weight of carrier, 8% by weight of Al / jO as a coating, 0.0012% by weight of platinum and 0.0012% by weight palladium. The catalyst activity under standard conditions is shown in the table.

Example 2. In 50 g of aluminum hydroxide obtained from aluminum chloride, 10 cm of concentrated hydrochloric acid dissolved in 2 liters of water are added and cooked for 6 hours, after which 5 g of platinum in the form of platinum (IV) are introduced - hydrochloric acid, as well as 5 g of cadmium chloride and 1 g of chlorine-chromium, and with further heating intensively stirred for 4 hours. The resulting mass with a jelly consistency is diluted with distilled water to an initial volume of 2 liters.

The solution contains 2.5 wt.% Alumina, 0.25 wt.% Platinum in the form of platinum {IV) -chloric acid, 0.25 wt.% Cadmium chloride and 0.05 wt.% Chlorine chromium.

This mass covers the carrier in the form of rings from a tape of heat-resistant steel. After calcination, a catalyst is obtained consisting of

99.2% by weight of steel carrier, 0.8% by weight of AlijOij as coatings, p, 007% by weight of platinum, 0.0047% by weight of cadmium and 0.0008% by weight of chromium.

The activity of this catalyst is presented in the table.

Example 3.8100 g of commercial aluminum hydroxide 10 g of acetic acid and 5 g of phosphoric acid and 2 l of water were added. The suspension is heated for 1.2 hours after settling and decanted from the precipitate. 1.9 L of a colloidal solution of aluminum hydroxide containing 4% by weight of anhydrous alumina is obtained. 0.1 g of tetraamine platinum chloride, 0.2 g of ammonium perrhenate and 1 g of tetrafluoride niobium are introduced into this solution. After stirring for 1 hour, a colloidal solution is obtained containing

4 wt.% Alumina, 0.005 wt.% Platinum, 0.01 wt.% Rhenium and 0.05 wt. niobium

The mass is applied to a ceramic carrier (aluminum-magnesium spinel), and after calcining, a catalyst is obtained consisting of 4 wt.% Coating, 0.005 wt.% Platinum, 0.0-11 wt.% Rhenium and 0.042 wt.% Niobium, the rest of the carrier .

The catalyst activity is indicated in the table.

Example 4. 100 g of aluminum hydroxide in 3 l of water containing

5 cm of concentrated sulfuric acid, is boiled for 12 hours under pressure, then cooled and 0.2 g of UC1 and 0.1 g of ammonium hexachloroplatino (IV) acid, 0.05 g of gelatin dissolved in an aluminum hydroxide solution, 0.05 g are added. at

100 ml of water. The colloidal solution contains 0.4 wt.% Alumina, 0.005 wt.% Iridium and O, 002 wt.% Platinum. The resulting solution is coated with an aluminum carrier}. After calcination, a catalyst was obtained consisting of 8 wt.% AljOj coating of 0.01 wt.% Iridium and 0.004 wt.% Of the planar. Tina; metal carrier - the rest.

The catalyst activity is indicated in the table.

Example 5. Aluminum hydroxide in an amount of 100 g, obtained by precipitating sodium aluminate with sulfuric acid at pH 6.5, was washed with WATER until the sulfate ions disappeared, 10% nitric acid was added and peptized for 4 hours at. The resulting product is leached with 2 liters of distilled water, a colloidal solution of aluminum hydroxide is obtained, containing 2% of dry weight. Into the resulting solution, 0.01 g of colloidal platinum is injected, obtained by spraying metallic platinum in an electric arc in water, 1 g of calcium nitrate and 2 g of freshly precipitated

colloidal silica. The mass contains 2 wt.% Alumina, 0.0005 wt.% Platinum, 0.05 wt.% Ca {N05) 2 and 0.1 wt.% SiO.

The alumina carrier is coated with a mass, and after calcination, a finished catalyst is obtained consisting of 4 wt.% AlgOj coating, 0.001 wt.% Platinum, 0.093 wt.% Roll and 0.024 wt.% Calcium, and the carrier is the rest.

The catalyst activity is indicated in the table.

Example 6. 100 g of aluminum hydroxide obtained by hydrolysis of aluminum isopropyl are added with 10 g of acetic acid in 1 l of water and heated to reflux for 12 hours. 800 ml of aluminum hydroxide are decanted containing 50 g of dry masses. 0.1 g of zirconium nitrate and 5 g of colloidal silicon oxide obtained by the action of hydrochloric acid on diluted water glass are introduced into the sol. After stirring both sols, 5 g of platinum (IV) hydrochloric acid in 100 ml of water are added.

A sol containing 5 wt.% Alumina, 0.25 wt.% Platinum, 0.01 wt.% Zirconium nitrate and 0.5 wt.% Si 02- is obtained. This mass is used to coat the shaped articles, and after calcining, a catalyst is obtained A total of 0.8% by weight of A12O coating is 0.04% by weight of platinum, 0.0005% by weight of zirconium and 0.024% by weight of silicon, the carrier is the rest.

Catalyst activities under standard conditions are listed in the table.

Example 7. Aluminum aluminum hydroxide obtained by hydrolysis of aluminum isopropyl was added 2 g of hydrochloric acid and 3 g of chlorine titanium in 1 l of water, then it was cooked for 2 hours

After cooling, 720 ml of aluminum hydroxide sol, containing 66 g of dry mass, is decanted.

2 g of platinum (IV) hydrochloric acid and 1.5 g of ammonium perrhenate are added to 100 liters of water in the sol. The resulting solution contains 8 wt.% Alumina, 0.25 wt.% Platinum (IV) -chloric acid, 0.18 wt.% Ammonium perrhenate and 0.36 wt.% Chlorine titanium. With this plant, Raschig's chamotte rings are coated with a thief and, after calcination, a catalyst is obtained consisting of 1.2 wt.% Of the coating, 0.02 wt.% Of platinum, 0.023 wt.% Of rhenium and

5 0,017 wt.% Titanium, the carrier - the rest.

The catalyst activity is indicated in the table.

P-example 8. In 100 g of aluminum hydroxide product enter 10 cm

0 concentrated hydrochloric acid, and 10 cm of concentrated nitric acid in 2 l of water. The suspension is boiled for 6 hours, and after cooling, the sol is filtered off. The sol is introduced into the sol.

five . 5 g of platinum (IV) hydrochloric acid and 0.8 g of meta-tungstic acid. In the case of long-term storage, the mass of lysubin is added in an amount of about 1 g.

0

The solution contains 4 wt.% Oxide. aluminum, 0.25 wt.% platinum (IV) hydrochloric acid, 0.04 weight. metavol Lramic acid.

5 The mass thus obtained covered the nickel plates and, after calcination, a finished catalyst was obtained consisting of 0.8 wt.% A17Oz coating, 0.05 wt.% Platinum and 0.006 wt.% Tungsten, support 0 was the rest.

The catalyst activity is indicated in the / table.

one

II

Tii

W

V

VI

93 95 98 96 95

85

90 98

90

Claims (2)

9S Data on the activity of catalysts for the conversion of ethylene carbon monoxide, carbon disulfide and hydrogen for hydrogen at atmospheric air pressure ethylene content in air 0.4 vol.% Temperature 250 С catalyst load 5000 For carbon monoxide: carbon monoxide content in spirit of 5 vol% temperature 280 ° C loading on a catalyst 5000 For carbon disulfide: carbon disulfide content in the spirit of 3 mg / l temperature load 10,000 h For hydrogen sulfide: hydrogen sulfide content in x 1.2 mg / l temperature 300 ° C YuOSO load h Formula invented: Method of catalyst preparation rchi stacks of gases containing organisms Continuation of the table are cakes and inorganic compounds, including the deposition of alumina and platinum on the carrier, followed by drying and calcination, characterized in that, in order to simplify the preparation and preparation of the catalyst with increased activity, a solution containing peptized colloidal oxide sol is applied to the carrier aluminum in the amount of 0,, 0 wt.%, colloidal platinum or a colloidal platinum compound or KOMnjieKCHoe platinum compound in the amount of 0.0002-0.25 wt.% based on platinum, additives selected from the groups Comprising a compound of rhenium, tungsten, chromium, titanium, zirconium, niobium, cadmium, calcium, silicon in an amount of from O to 0.24 weight%. Sources of information taken into account in the examination 1. Catalysis Rev i ews ,, 1972, b. 2. USSR author's certificate 386659, cl. B 01 J 37/02, 1971 (prototype).