Low-temperature and highly efficient denitration catalyst and corresponding method of preparation

Patent metadata

Field	Value
Publication number	US-10179324-B2
Application number	US-201615176405-A
Country	US
Kind code	B2
Filing date	Jun 8, 2016
Priority date	Apr 4, 2014
Publication date	Jan 15, 2019
Grant date	Jan 15, 2019

Abstract

The present invention relates to a field of control of nitrogen oxide pollution, and involves a high-efficient catalyst for denitration at low temperature and preparation method thereof, which comprises the steps: (1) preparing aqueous solution of cerium nitrate; (2) soaking mesoporous silica materials SBA-15 with aqueous solution from step (1), after stirring, filtrating, washing and drying; (3) calcining materials from step (2) to obtain evenly dispersed CeO 2 -SBA-15 materials; (4) preparing ethanol solution of manganese nitrate; (5) soaking CeO 2 -SBA-15 materials from step (3) with ethanol solution of manganese nitrate from step (4) and volatilizing ethanol, washing and drying; (6) calcining materials from step (5) to obtain evenly distributed Mn x O y /CeO 2 -SBA-15 catalyst for denitration; The preparation method has simple process with lower cost, and the obtained Mn x O y /CeO 2 -SBA-15 catalyst has uniform and ordered pores, large specific area, narrow pore size distribution, well dispersity of catalytic components, high catalytic activity, better effect of denitration at low temperature range and wider temperature range available for denitration.

First claim

What is claimed:

1. A method for preparing catalyst for denitration, wherein the method comprises the following steps:
(a) preparing an aqueous solution of cerium nitrate;
(b) soaking mesoporous silica materials SBA-15 with the aqueous solution of cerium nitrate obtained from step (a), then stirring, filtrating, washing and drying;
(c) calcining the materials obtained from step (b) to obtain CeO 2 -SBA-15 materials;
(d) preparing an ethanol solution of manganese nitrate;
(e) soaking the CeO 2 -SBA-15 materials from step (c) with the ethanol solution of manganese nitrate from step (d), then volatilizing ethanol, washing and drying; and
(f) calcining the materials obtained from step (e) to obtain Mn x O y /CeO 2 -SBA-15 catalyst for denitration.

2. The method according to claim 1 , wherein in step (a) the concentration of the aqueous solution of cerium nitrateis 0.1 mol/L to 1 mol/L.

3. The method according to claim 1 , wherein in step (b) dosage of mesoporous silica materials SBA-15 is 10 g/L to 40 g/L.

4. The method according to claim 1 , wherein in step (b) soaking time is 4 to 8 hours.

5. The method according to claim 1 , wherein in step (c) calcining temperature is 300° C. to 500° C. and calcining time is 4 hours to 8 hours.

6. The method according to claim 1 , wherein in step (d) a mass of manganese in the ethanol solution of manganese nitrate accounts for 10% to 30% of dosage of the CeO 2 -SBA-15 materials.

7. The method according to claim 1 , wherein in step (e) soaking time is 1 hour to 3 hours.

8. The method according to claim 1 , wherein in step (f) calcining temperature is 300° C. to 500° C. and calcining time is 4 hours to 8 hours.

9. The method according to claim 1 , wherein and Mn x O y is MnO 2 and Mn 2 O 3 .

10. The method according to claim 1 , wherein pores of the catalyst have two-dimensional hexagonal structures, and sizes of the pores range from 6 nm to 7 nm, specific areas of the pores range from 300 m 2/g to 500 m 2/g, and volumes of the pores range from 0.3 cm 3/g to 0.5 cm 3/g.

Assignees

• Univ Tongji
• Shanghai Tongji Clearon Environmental Prot Equipment Engineering Co Ltd
• Shanghai Tongji Clearon Enviornmental Prot Equipment

Inventors

• Fan Jianwei
• Jiang Xu
• Min Hongyang
• Li Dandan
• Chen Minjun
• Chen Wangyuan
• Sun Yu
• Ran Xianqiang

Classifications

• B01J35/0006

  Operations & Transport · mapped topic

• B01D2255/30

  Silica · CPC title

• B01D53/8628 Primary

  Processes characterised by a specific catalyst · CPC title

• B01J37/0203

  the impregnation liquid containing organic compounds · CPC title

• B01J2523/41

  Silicon · CPC title