Ethylene degradation catalyst and preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-2023149903-A1
Application number	US-202117559673-A
Country	US
Kind code	A1
Filing date	Dec 22, 2021
Priority date	Nov 16, 2021
Publication date	May 18, 2023
Grant date	—

Abstract

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

First claim

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.

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%, preferably 5.15%-8.66%.

4 . The catalyst of claim 1 , wherein the catalyst comprises TiO2 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 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.

7 . A method of preparing the ethylene degradation catalyst, 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 prepared 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.

8 . The method of claim 7 , wherein the acid is concentrated sulfuric acid, preferably the acid has a concentration of 85-92 wt %.

9 . The method of claim 7 , wherein the conditions of mixing include a temperature of 20-30° C. and a time of 2-6 hours.

10 . The method of claim 7 , wherein the mass ratio of the titanium source powder to the acid is 1:(1.5-2).

11 . The method of claim 7 , wherein the roasting temperature is within a range of 150-300° C. and the roasting time is 30-90 min.

12 . The method of claim 7 , wherein the titanium source powder has an average particle size of 10-1,000 μm.

13 . The method of claim 7 , wherein the water leaching conditions comprise a temperature of 60-120° C. and a time of 60-180 min.

14 . The method of claim 7 , wherein the mass ratio of the product to the water used in the water leaching is 1:(2-6).

15 . The method of claim 7 , wherein the hydrolysis temperature is within a range of 80-110° C., preferably 85-105° C.; and the hydrolysis time is within a range of 2-5 h.

16 . The method of claim 7 , wherein the aging time is within a range of 15-30 h, preferably 16-26 h, and the aging temperature is within a range of 10-50° C.

17 . The method of claim 7 , wherein the drying temperature is within a range of 65-95° C. and the drying time is 60-120 min.

18 . The method of claim 7 , wherein the calcination temperature is within a range of 450700° C., the calcination time is 2-8 h, and the temperature rise rate is 5-10° C./min.

19 . The method of claim 7 , 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.

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

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