KR100704128B1 - Nano catalyst and preparation method for removal of volatile organic compounds - Google Patents

Abstract

A refractory inorganic oxide is dried on alumina and Sm ₂ O ₃ solid powders and dried on a catalyst loaded with precious metals and transition metals, calcined between 300 ° C and 600 ° C, resulting in the structural change of the catalyst, resulting in nanoparticles, increased catalyst activity, and volatility. Catalyst and preparation method for completely oxidizing organic compound at low temperature and converting it into carbon dioxide and water

Volatile Organic Compounds, Complete Oxidation, Precious Metals, Nanocatalysts

Description

Nano-catalytic removal method for volatile organic compounds and manufacturing method {NANO CATALYST AND PREPARATION METHOD FOR REMOVAL OF VOLATILE ORGANIC COMPOUNDS}

Conventional catalyst production methods have been used by firing at 300 ° C. to 700 ° C. using an alumina as an inorganic refractory and a catalyst in which platinum or platinum is supported on powder or pellets. There are many differences in the performance of removing volatile organic compounds according to the amount of platinum used and the manufacturing method, and it was difficult to completely oxidize at high temperatures. In addition, due to incomplete oxidation, oxidative by-products and formaldehyde are more generated, causing odors.

The present invention eliminates the drawbacks of the prior art, to completely oxidize volatile organic compounds at low temperatures to remove odors, to provide a volatile organic compound removal nanocatalyst and a method for preventing the deactivation of the catalyst.

In the method used in the present invention, an inorganic refractory is dried alumina and Sm ₂ O ₃ powder or pellets for 12 hours at 110 ℃ and using at least one of palladium, platinum, iridium as a platinum group (A) metal A mixture of one or more metals in cobalt and crum as a transition metal (B) at a weight ratio of (A) :( B) = 1: 2 to 20: 1 so that (A) + (B) is 0.1 to 10% by weight. Impregnated, dried at 110 ° C. for 12 hours and calcined at 300 ° C. to 600 ° C. for 4 hours to cause structural changes in the catalyst to maintain the metal particles of the catalyst finely, thereby increasing the activity of the catalyst and volatile organic compounds at low temperatures. Is a method for producing a catalyst which completely oxidizes and inhibits deactivation of the catalyst. (A) When two or more metal materials are used, the weight ratio between (A) metal materials is not limited within the weight ratio of (A) + (B) to the total alumina. (B) When two or more metal materials are used, the weight ratio between (B) metal materials is not limited within the weight ratio of (A) + (B) to total alumina and Sm ₂ O ₃ .

The present invention is explained in more detail by the following examples, which are not intended to limit the present invention.

Example 1 to Example 6 showed the oxidation catalyst performance of the volatile organic compound by the combination of the catalyst, the carbon dioxide yield due to the volatile organic compound oxidation reaction at low temperature, Comparative Example 1 and Comparative Example 2 using only alumina as a carrier The performance of the catalyst for the oxidation reaction of volatile organic compounds when platinum or palladium was used as the metal catalyst was shown. The oxidation reaction of volatile organic compounds was 2,000ppm of toluene and the balance gas was air.

The reaction temperature was carried out between 250 ° C and 450 ° C. The catalyst was charged into a fixed bed continuous flow reactor and the amount of catalyst and reactant flow rate were determined such that the space velocity was 30,000 / hr. The experimental data shows the values obtained by continuous experiments for 200 hours.

Table 1 shows the constituents of the catalyst, and Table 2 shows the carbon dioxide yield after oxidation of toluene, a volatile organic compound.

Example 1

100 g of alumina and 100 g of Sm ₂ O ₃ are mixed to form an aqueous slurry, washed with a honeycomb of 150 × 150 × 50 size, dried at 120 ° C. for 12 hours, and an aqueous palladium chloride solution containing 2 g of palladium as a platinum group (A) metal. And (B) impregnated with a mixed solution of cobalt nitrate containing 2 g of cobalt as a metal material, dried at 120 ° C. for 12 hours, calcined at 500 ° C. for 2 hours, and then subjected to diopio oxidation.

Example 2

Same as Example 1 except that (A) component of Table 1 is 2 g of platinum, and (B) component is 2 g of chromium.

Example 3

Same as Example 1 except that (A) component of Table 1 is 1 g of palladium, 1 g of platinum, and (B) is 1 g of cobalt and 1 g of chromium.

Example 4

Same as Example 1 except that (A) component of Table 1 is 2 g of iridium, (B) component is 1 g of cobalt and 1 g of chromium.

Example 5

Same as Example 1 except that (A) component of Table 1 is 1 g of platinum 1 g of iridium, (B) is 1 g of cobalt and 1 g of chromium.

Example 6

Same as Example 1 except that (A) component of Table 1 is 1 g of palladium, 1 g of iridium, and (B) is 1 g of cobalt 1 g of chromium.

Comparative Example 1)

200 g of alumina was made into an aqueous slurry, was washed in a honeycomb of 150 × 150 × 50 standard, dried at 120 ° C. for 12 hours, immersed in an aqueous palladium chloride solution containing 4 g of platinum, dipped at 120 ° C. for 12 hours, and then 500 The mixture was calcined at 2 ° C. for 2 hours and then subjected to diopio oxidation.

Comparative Example 2)

Same as Comparative Example 1 except that (A) component of Table 1 is 4 g of palladium.

Table 1. Catalyst component

Table 2. CO ₂ Yield after Volatile Organic Compound (Toluene) Oxidation

                       GHSV (space velocity) = 30,000 / hr (unit;%)

As described above in detail, the volatile organic compound oxidation catalyst used in the present invention has a very high yield of carbon dioxide because the volatile organic compound oxidation reaction proceeds completely even at a low temperature. And it lasts 200 hours and does not cause deactivation, which provides a very good effect on low temperature oxidation reaction.

Claims (4)

A catalyst characterized by using at least one of palladium, platinum and iridium as a platinum group metal (A) and at least one of cobalt and chromium as transition metals (B) in a mixture of alumina and Sm ₂ O ₃ as a refractory inorganic compound. The use amount of the platinum group metal (A) and the transition metal (B) according to claim 1 is a mixture of (A) :( B) = 1: 2 to 20: 1 in a weight ratio of 0.1 to (B). A catalyst characterized in that used in the mixture of alumina and Sm ₂ O ₃ to 10% by weight Wash-coat alumina and Sm ₂ O ₃ with honeycomb as a refractory inorganic compound and dry at 110 ° C for 12 hours, and impregnate at least one of palladium, platinum and iridium with platinum group (A) metal, Method for producing a catalyst, characterized in that for drying for 4 hours and calcined at 300 ℃ to 600 ℃ for 4 hours delete