Ethylene degradation catalyst and preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-11813591-B2
Application number	US-202117559673-A
Country	US
Kind code	B2
Filing date	Dec 22, 2021
Priority date	Nov 16, 2021
Publication date	Nov 14, 2023
Grant date	Nov 14, 2023

Abstract

The present disclosure discloses an ethylene degradation catalyst and a preparation method and a use thereof.

First claim

The invention claimed is:

1. An ethylene degradation catalyst, comprising TiO 2 crystals and auxiliary agents; wherein the crystalline form of TiO 2 crystal is an anatase type, and the surface of TiO 2 crystal is covered with a TiO 2 disordered layer containing surface hydroxyl groups,
wherein the catalyst comprises K 2 O in an amount of 0.002-0.006 wt % and Na 2 O in an amount of 0.006-0.098 wt %, based on the total weight of the catalyst.

2. The catalyst of claim 1 , wherein the TiO 2 disordered layer has a thickness of 1.8-3 nm.

3. The catalyst of claim 1 , wherein a molar percentage of the Ti 3+ of the TiO 2 disordered layer in Ti elements is within a range of 2.15%-10.37%.

4. The catalyst of claim 1 , wherein the catalyst comprises TiO 2 in an amount of 99.9-99.99 wt %, based on the total weight of the catalyst.

5. The catalyst of claim 1 , wherein the auxiliary agents comprise K 2 O and Na 2 O.

6. The catalyst of claim 1 , wherein a molar percentage of the Ti 3+ of the TiO 2 disordered layer in Ti elements is within a range of 5.15%-8.66%.

7. A use of a catalyst of claim 1 in the catalytic degradation of ethylene.

8. A method of preparing the ethylene degradation catalyst of claim 1 , comprising the following steps:
(1) mixing a titanium source powder with an acid, and roasting an obtained mixture;
(2) subjecting a product obtained from the roasting process to water leaching, and subsequently to a solid-liquid separation to obtain a Ti-containing filtrate;
(3) subjecting the filtrate to hydrolysis and aging to obtain a metatitanic acid colloid comprising auxiliary agent elements which contain Na and K;
(4) subjecting the metatitanic acid colloid to water washing, drying and calcination, to obtain nano-TiO 2 powder;
(5) subjecting the nano-TiO 2 powder to hydrogenation, so as to prepare the ethylene degradation catalyst;
wherein the titanium source powder is selected from the group consisting of spent SCR denitration catalysts containing Na 2 O and K 2 O.

9. The method of claim 8 , wherein the acid is concentrated sulfuric acid, preferably the acid has a concentration of 85-92 wt %.

10. The method of claim 8 , wherein the conditions of mixing include a temperature of 20-30° C. and a time of 2-6 hours.

11. The method of claim 8 , wherein the mass ratio of the titanium source powder to the acid is 1:(1.5-2).

12. The method of claim 8 , wherein the roasting temperature is within a range of 150-300° C. and the roasting time is 30-90 min.

13. The method of claim 8 , wherein the titanium source powder has an average particle size of 10-1,000 μm.

14. The method of claim 8 , wherein the water leaching conditions comprise a temperature of 60-120° C. and a time of 60-180 min.

15. The method of claim 8 , wherein the mass ratio of the product to the water used in the water leaching is 1:(2-6).

16. The method of claim 8 , wherein the hydrolysis temperature is within a range of 80-110° C.; and the hydrolysis time is within a range of 2-5 h.

17. The method of claim 8 , wherein the aging time is within a range of 15-30 h, and the aging temperature is within a range of 10-50° C.

18. The method of claim 8 , wherein the drying temperature is within a range of 65-95° C. and the drying time is 60-120 min.

19. The method of claim 8 , wherein the calcination temperature is within a range of 450-700° C., the calcination time is 2-8 h, and the temperature rise rate is 5-10° C./min.

20. The method of claim 8 , wherein the hydrogenation condition comprises a hydrogenation temperature of 400-550° C., a hydrogenation temperature rise rate of 5-10° C./min, a hydrogenation time of 2-12 h, a hydrogen concentration of 90-100 vol %, and a hydrogen flow rate of 100-300 mL/min.

Assignees

• China Energy Investment Corp Ltd
• Nat Inst Clean & Low Carbon Energy

Inventors

• Li Ge
• Wang Baodong
• Ma Ziran
• Ma Jing
• Peng Shengpan
• Wang Hongyan

Classifications

• B01D2255/9207

  Specific surface · CPC title

• B01D2255/9205

  Porosity · CPC title

• B01D2257/7022

  Aliphatic hydrocarbons · CPC title

• B01D2255/20707

  Titanium · CPC title

• B01D53/864

  Removing carbon monoxide or hydrocarbons · CPC title