SU954098A1 - Catalyst for cleaning exhaust gases from dimethyl formamide and method of producing it - Google Patents

Description

barium, chromium, vanadium, phosphoric acid, plasticizing agent, bringing the mixture to plastic mass, molding, drying and calcining anne 4, The disadvantage of the known catalyst is relatively low activity. The method of its preparation is characterized by laboriousness and duration. Thus, the degree of purification of waste gases from dimethylformamide at a concentration of 500 mg / m - in the presence of a known catalyst with a flow rate of 1000 hours is 92%. The purpose of the invention is to increase the activity of the catalyst, as well as to develop a less time-consuming and long-lasting method of its preparation. The goal is achieved by TeM that the catalyst, containing oxides of copper and copper, additionally contains aluminum, iron, and ruthenium with the following content of ingredients, weight. Barium oxide, B, 2-7.0 Aluminum oxide 61.4945-76.19 Iron oxide 7, Ruthenium oxide 0.005-0.006 Medium oxide oxide Method of catalyst preparation is carried out by mixing barium hydroxide, alumina, iron oxide with hydroxochloride solutions, ruthenium and nitric acid copper, bringing the resulting mixture to plastic, molding, drying and calcining. The proposed catalyst allows purification of exhaust gases from dimethylformamide at its concentration of 500 mg / m temperature and space velocity of 10,000–95–97%. Example. For the preparation of the catalyst, 1 g of BaCOH 8.75 g of alumina 3 g of FejOa is mixed, a mixture of 0.3 cm ° of a solution of RuOHC with a concentration of 5 g / l and 5 cm of a solution of CuCNO) of 750 g / l is added and stirred until a plastic mass is formed . Then granules are formed in the form of worms, which are first dried for 4 hours at lOO-llO C, and then calcined for 5 hours at. Received katadgasator contains in its composition, wt.%: The copper oxide of 11.2; barium oxide 6.2j iron oxide 21.1; alumina 61.4945 and ruthenium oxide 0.0055 .. Example 2. To obtain a catalyst, 1 g of Ba (OH), i 9.3 g, 2 g of FejO are mixed and a mixture of 0.3 cm of a 5 V RuOHCl solution is added / l and. 5 cm of solution a.3 from the noodles of the pouredmed CuCNO)) at a concentration of 750 g / l to form a plastic mass. The resulting mass is formed into catalyst granules, which are dried for 4 hours at 100–110 ° C and calcined for 5 hours at 500 ° C. The catalyst contains, wt%: copper oxide 11.5; oxide barium 6.5 j iron oxide 14.5; alumina 67.494 and ruthenium oxide 0.006. Example 3. To obtain a catalyst, 1 g of Ba (OH) | , 9.85, g AljO. 1 g and a mixture of 3.7 cm of copper nitrate solution with a concentration of 750 g / l and 0.3 cm of a RuOHCl solution is added to form a solid mass, which is granulated into worms. The resulting catalyst granules are dried for 4 hours at 100–110 ° C, and ai is then calcined for 5 hours at 520 ° C. The catalyst contains, wt%: copper oxide 9.1; barium oxide 7.0 j iron oxide 7.7; alumina 76.195 and ruthenium oxide 0.005. The table shows the test results of the proposed and known catalysts in the oxidation of dimethylformamide.

Famous

500

OfferC

550

1 2 3 500 440

10,000

0.6

92

250 10000 0.8 96 250 10000 0.4 97 250. 10,000 0.5 95

Claims (4)

1.-Catalyst for the purification of flue gases from dimethylformamide containing copper oxide and barium, characterized in that, in order to increase the activity, it additionally contains aluminum oxide, iron, ruthenium at the following ingredient content, wt.%: Barium oxide 6.2-7.0 Aluminum oxide 61.4945-76,195 Iron oxide7.7-21.1 Ruthenium oxide 0.005-0.006 Copper oxideEstal 2. A method for preparing a catalyst according to Claim 1, which includes mixing components containing copper or barium compounds, bringing the resulting mixture to a plastic mass, molding, drying and calcining, characterized in that the barium hydroxide, alumina, iron oxide is mixed with solutions of hydrotic ruthenium xochloride and copper nitrate. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 340651, cl. On 01 J 23/42, 1972. 2. USSR author's certificate number 452129, cl. On 01.J 23/72, 1975. 3. The patent of the USA 392682, kl.252-410, published. 1975. 4. USSR author's certificate number 630778, cl. B 01 J 23/72, 1978 .(prototype).