SU1583161A1 - Catalyst for deep oxidation of organic compounds and carbon oxide - Google Patents

Abstract

This invention relates to catalytic chemistry, in particular, catalysts for the deep oxidation of organic compounds and carbon monoxide in exhaust gases, which can be used in chemistry, petrochemistry and metallurgy for cleaning contaminated copper and chromium compounds by AL 2 O 3 gas emissions into the atmosphere . The goal is to increase the stability of the catalyst to the poisoning effect of sulfur compounds. For this purpose, in a catalytic composition based on copper chromite or copper-magnesium, f-ly CU 1-XMG X .CR 2O 4, where X = 0.5-0.65 (8.6-26 wt.%), On alumina Vanadium oxide is additionally introduced in an amount of 1.5-15 wt.%. In this case, the catalyst has a high heat resistance at 400-500 ° C and is resistant to SO 2 poisoning with a 4-8 fold higher degree of conversion of CO. 2 tab.

Description

The invention relates to catalytic chemistry, in particular to catalysts for the deep oxidation of organic compounds in the flue gas, and can be used in the chemical, petrochemical, metallurgical and other industries to purify contaminated gas emissions into the atmosphere.

The aim of the invention is to increase the resistance to the poisoning effect of sulfur compounds by catalysis. torus for the oxidation of carbon monoxide and paraffin hydrocarbons, including chromite copper or copper magnesium on alumina due to the additional content of vanadium oxide at a certain ratio of components.

Example 10 The catalyst composition, wt.%: CuCr704 25.5 V205-1,5; 73, prepared as follows. The carrier — alumina (grain diameter 1.0–1.6 mm, specific surface area 230, strength 22 Mlla, moisture capacity 0.50 ml / g), is impregnated according to moisture capacity with a solution of copper dichromate with a concentration of Cg280mg / h C 160 mg / ml (solution 1). The sample is kept at room temperature and vigorous stirring for 45-60 minutes, then dried under IR-Flame to a residual moisture content of 3-5 May.% And calcined in a muffle furnace at 970 K 4 hours. After calcination, the sample r is simulated by capacity with a solution Vanadium sulfate with a concentration of 20 mg / ml (solution 2), dried under infrared lamps and calcined at 820 K for 4 h.

The catalytic activity is evaluated according to the degree of CO conversion (at 400 and 500 ° C) in a flow-circulation installation using a mixture of 1 vol.% CO, the rest is air (at a mixture flow rate of 10–15 l / h). poisoning with sulfur compounds is estimated by the change in the degree of conversion of CO with simultaneous feeding of 0.060 ± 0.005% by volume of SO2 into the reaction mixture.

Thermal stability of catalysts Evaluated by changes in mechanical strength (P) and catalytic activity in the oxidation of CO (T) and butane (W), P is the strength determined on the MP-2S device, T is the temperature reaching 50% degree of CO Conversion at the weight of catalysis-Torus is 1 g, W is the rate of oxidation of butane at its stationary concentration in a mixture with air of 0.2 vol.%, determined by the flow-circulation method at 400 ° C.

II p and me 2, similar to example 1, but the concentration of solution 2 according to Vi05 is 130 mg / ml, solution 1 contains 120 mg / ml Cg 70 mg / ml Cu,

EXAMPLE 3 Similar to Example 1, but in solution 1 230 mg / ml Cr, 130 mg / ml Cu are contained, and the concentration of solution 2 is VaOj, 130 mg / m. The solution is prepared as follows: a suspension of W 4 MOe in water ( 10, 20 ml) is heated to boiling, after which oxalic acid is added to it in small portions until the precipitate is completely dissolved and the resulting solution is diluted to the required

concentration 0

Example 4. Similar to example 3, but the concentration of solution 2 is 360 mg / ml.

d 5

Q 5

"

five

0

45

55

Example 5 “Similar to Example 1, but. Alumina is impregnated with a mixture of copper and magnesium dichromate solutions with a concentration of, mg / ml. Cu 92, Mg 35, Cg 300, and a concentration of solution 2 at 80 mg / ml.

Example 6 “Similar to example 5, but the composition of the solution is 1 mg / ml; C 2b; Mg 19; Cr 129 and the concentration of solution 2 at Va05 is 50 mg / ml.

Example 7. Similar to example 5, but the concentration of elements in solution 1, mg / ml: Cu 80, Mg 31, Cr 260, and solution 2 63 mg / ml.

Example 8. The analogous example is 5, but the concentration of elements in the solution is 1, mg / ml: Cu 22, Mg 19, Cr 120, and the concentration of the solution 2 13 mg / ml.

Example 9 Similar to Example 5, but the concentration of elements in the solution is 1, mg / ml: Cu 102, Mg 35, Cr 320, and the concentration of the solution 2 is 80 mg / ml.

Example 10. The catalyst composition,%: Cu0 / 3 Mg 0 / 7Cru04 20; s 5.7; Al203 74.3, prepared analogously to Example 5, but the concentration of elements in solution 1, mg / ml: Cu 60, Mg 52, Cr 330.

Example 11 A catalyst containing 23% SiCgO $ and 77% A1 / 2.05 is prepared as follows. A carrier (its properties are described in Example 1) is impregnated in moisture capacity with a solution of copper dichromate with a Cu concentration of 150 mg / ml, Cr 260 mg / ml. The sample is dried and calcined at 700 ° C for 4 hours.

The properties of the catalyst are given in table. 1 and 2.

As can be seen from Example 11 (Table 1), the oxide aluminum-copper-chromium catalyst (known) loses activity in the presence of SO2, especially when, in a short time and almost completely. The incorporation into the composition of the active component of copper-chromium catalysts of the compound vanadium makes it possible to increase the stability of the catalysts to poisoning with sulfur compounds at 400 ° C, and at 500 ° C to virtually eliminate their influence on the efficiency of the catalysts. The use of copper and magnesium chromite compounds in the composition of the active component makes it possible to obtain catalysts resistant to the effects of sulfur compounds with enhanced thermal stability and catalytic

activity in about: and. with. Shea hydrocarbons. They are substantially superior to the degree of CO known for resistance to SOi poisoning. at 400 ° C higher by 4-8 times.

Claims (1)

Invention Formula A catalyst for the deep oxidation of organic compounds and carbon monoxide in waste gases, containing a compound of copper and chromium on alumina, so that, in order to increase the resistance to poisoning by sulfur compounds, the catalyst contains as copper and chromium compounds copper chromite or copper-magnesium chromite of the formula Cu1.KMgxCr204, where x 0.5 - 0.65, and additionally contains vanadium oxide in the following ratio of components, wt0%: Chromite copper or copper-magnesium 8.5-26.0 Vanadium oxide 1.5-15.0 Alumina. Rest Table 1 Amount of 50 missed CO conversion Table 2