A kind of integral catalyst and its preparation and application

Abstract

The invention provides a H 2 Highly dispersed monolithic catalyst for selective catalytic oxidation, its preparation method and application. The catalyst is suitable for fixed bed reactors. The catalyst has a multi-layer structure, including but not limited to a shell layer, an active component layer, a washcoat layer and a honeycomb support layer. The catalyst of the present invention can be used for H 2 In the process of selective catalytic oxidation, H in the feed gas 2 :O 2 =1:1‑1:3, reaction temperature 150‑250℃, pressure 0.3‑0.6MPa, space velocity 3000‑20000h ‑1 condition, exit H 2 The content is lower than 100ppm, which fully meets the reaction requirements of subsequent gas-phase catalytic coupling of CO to synthesize oxalate.

Description

technical field

[0001] The invention belongs to the field of coal chemical industry, in particular to a H 2 Highly dispersed monolithic catalyst for selective catalytic oxidation, its preparation method and application. Background technique

[0002] Ethylene glycol is an important chemical basic raw material used in the production of various polyesters and antifreeze agents. At present, the ethylene glycol demanded by my country needs to rely heavily on imports, and the synthesis gas (CO+H) is produced through coal gasification. 2 ), the "coal-to-ethylene glycol" technology, which combines oxalate with CO catalytic coupling and hydrogenation to generate ethylene glycol, can make full use of my country's relatively abundant coal resources to produce ethylene glycol, and may gradually replace the "petroleum route "technology. Then reduce my country's dependence on oil imports, and change the current situation in which ethylene glycol is in short supply due to lack of oil res...

Examples

Embodiment 1

[0055] a) Coating preparation: 10g of hydroxyapatite Ca 5 (PO 4 ) 3 (OH) and 60 g of deionized water were mixed in a 100 ml ball mill tank, the speed of the ball mill was adjusted to 500 r / min, and the catalyst coating carrier slurry was obtained after ball milling for 6 hours. Select a monolithic catalyst carrier with a pore size of 400 holes / square inch, dip the coating carrier slurry for 3 minutes, then use compressed air to remove excess liquid slurry in the channel of the monolithic catalyst carrier, and repeat the above coating after drying. The coating step was carried out 3 times, and the weight of the coated catalyst promoter was weighed to be 20% of the overall catalyst carrier, and it was placed in a muffle furnace for calcination at 400° C. for 2 h.

[0056] b) Take 0.03g Nd(NO 3 ) 3 ﹒ 6H 2 O dissolved in 5ml of water to form Nd(NO 3 ) 3 solution, impregnating the above-mentioned additive-free carrier in the solution for 2 hours, and then drying at 80° C. f...

Embodiment 2

[0062] a) Coating preparation: 10g of hydroxyapatite Ca 5 (PO 4 ) 3 (OH) and 60 g of deionized water were mixed in a 100 ml ball mill tank, the speed of the ball mill was adjusted to 500 r / min, and the catalyst coating carrier slurry was obtained after ball milling for 6 hours. Select a monolithic catalyst carrier with a pore size of 400 holes / square inch, dip the coating carrier slurry for 3 minutes, then use compressed air to remove excess liquid slurry in the channel of the monolithic catalyst carrier, and repeat the above coating after drying. The coating step was carried out 3 times, and the weight of the coated catalyst promoter was weighed to be 20% of the overall catalyst carrier, and it was placed in a muffle furnace for calcination at 400° C. for 2 h.

[0063] b) Take 0.03g Nd(NO 3 ) 3 ﹒ 6H 2 O dissolved in 5ml of water to form Nd(NO 3 ) 3 solution, impregnating the above-mentioned additive-free carrier in the solution for 2 hours, and then drying at 80° C. f...

Embodiment 3

[0068] a) Coating preparation: 10 g of Beta molecular sieve and 60 g of deionized water were mixed, ultrasonically treated for 30 min and then stirred for 2 h to obtain catalyst coating carrier slurry. Select an integral catalyst carrier with a channel mesh number of 600 holes / square inch, dip the coating carrier slurry for 3 minutes, then use compressed air to remove excess liquid slurry in the channel of the integral catalyst carrier, and repeat the above coating after drying. The coating step was carried out 3 times, and the weight of the coated catalyst promoter was weighed to be 20% of the overall catalyst carrier, and it was placed in a muffle furnace for calcination at 400° C. for 2 h.

[0069] b) take 1.92g (NH 4 ) 2 HPO 4 Dissolve in 10ml of water to form a solution, impregnate the additive-free carrier prepared in the above steps in this solution for 2 hours, then dry it at 80°C for 12 hours, place it in a muffle furnace and bake it at 400°C for 2 hours to obtain a...

technical field

[0001] The invention belongs to the field of coal chemical industry, in particular to a H 2 Highly dispersed monolithic catalyst for selective catalytic oxidation, its preparation method and application. Background technique

[0002] Ethylene glycol is an important chemical basic raw material used in the production of various polyesters and antifreeze agents. At present, the ethylene glycol demanded by my country needs to rely heavily on imports, and the synthesis gas (CO+H) is produced through coal gasification. 2 ), the "coal-to-ethylene glycol" technology, which combines oxalate with CO catalytic coupling and hydrogenation to generate ethylene glycol, can make full use of my country's relatively abundant coal resources to produce ethylene glycol, and may gradually replace the "petroleum route "technology. Then reduce my country's dependence on oil imports, and change the current situation in which ethylene glycol is in short supply due to lack of oil res...

Examples

Embodiment 1

[0055] a) Coating preparation: 10g of hydroxyapatite Ca 5 (PO 4 ) 3 (OH) and 60 g of deionized water were mixed in a 100 ml ball mill tank, the speed of the ball mill was adjusted to 500 r / min, and the catalyst coating carrier slurry was obtained after ball milling for 6 hours. Select a monolithic catalyst carrier with a pore size of 400 holes / square inch, dip the coating carrier slurry for 3 minutes, then use compressed air to remove excess liquid slurry in the channel of the monolithic catalyst carrier, and repeat the above coating after drying. The coating step was carried out 3 times, and the weight of the coated catalyst promoter was weighed to be 20% of the overall catalyst carrier, and it was placed in a muffle furnace for calcination at 400° C. for 2 h.

[0056] b) Take 0.03g Nd(NO 3 ) 3 ﹒ 6H 2 O dissolved in 5ml of water to form Nd(NO 3 ) 3 solution, impregnating the above-mentioned additive-free carrier in the solution for 2 hours, and then drying at 80° C. f...

Embodiment 2

[0062] a) Coating preparation: 10g of hydroxyapatite Ca 5 (PO 4 ) 3 (OH) and 60 g of deionized water were mixed in a 100 ml ball mill tank, the speed of the ball mill was adjusted to 500 r / min, and the catalyst coating carrier slurry was obtained after ball milling for 6 hours. Select a monolithic catalyst carrier with a pore size of 400 holes / square inch, dip the coating carrier slurry for 3 minutes, then use compressed air to remove excess liquid slurry in the channel of the monolithic catalyst carrier, and repeat the above coating after drying. The coating step was carried out 3 times, and the weight of the coated catalyst promoter was weighed to be 20% of the overall catalyst carrier, and it was placed in a muffle furnace for calcination at 400° C. for 2 h.

[0063] b) Take 0.03g Nd(NO 3 ) 3 ﹒ 6H 2 O dissolved in 5ml of water to form Nd(NO 3 ) 3 solution, impregnating the above-mentioned additive-free carrier in the solution for 2 hours, and then drying at 80° C. f...

Embodiment 3

[0068] a) Coating preparation: 10 g of Beta molecular sieve and 60 g of deionized water were mixed, ultrasonically treated for 30 min and then stirred for 2 h to obtain catalyst coating carrier slurry. Select an integral catalyst carrier with a channel mesh number of 600 holes / square inch, dip the coating carrier slurry for 3 minutes, then use compressed air to remove excess liquid slurry in the channel of the integral catalyst carrier, and repeat the above coating after drying. The coating step was carried out 3 times, and the weight of the coated catalyst promoter was weighed to be 20% of the overall catalyst carrier, and it was placed in a muffle furnace for calcination at 400° C. for 2 h.

[0069] b) take 1.92g (NH 4 ) 2 HPO 4 Dissolve in 10ml of water to form a solution, impregnate the additive-free carrier prepared in the above steps in this solution for 2 hours, then dry it at 80°C for 12 hours, place it in a muffle furnace and bake it at 400°C for 2 hours to obtain a...

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