A Novel Catalytic Activity of Ce-Zr-Mn-OX Mixed Oxides for Low Temperature Selective Catalytic Reduction of NO with NH3

2013 ◽  
Vol 864-867 ◽  
pp. 635-639
Author(s):  
Qiu Lin Zhang ◽  
Zhong Xian Song ◽  
Ping Ning ◽  
Jun Jie Gu
Keyword(s):  
Catalytic Activity ◽  
Hydrothermal Synthesis ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Mixed Oxides ◽  
Catalytic Reduction ◽  
Synthesis Method ◽  
Space Velocity ◽  
Reduction Of No ◽  
Different Temperatures

A Ce-Zr-Mn-Ox(CZM) catalyst has been discovered for selective catalytic reduction of NOxwith NH3in the presence of O2. In this paper, The catalysts of CZM with 10~50 wt% MnO2content and Ce-Zr-O2(CZ) catalyst are prepared by hydrothermal synthesis method. The catalytic activity of CZM catalysts at different temperatures, different space velocities and different ratios of NH3/NO are studied. The results show that the catalyst of CZM with 40 wt% MnO2content yields higher NO conversion at low temperature than others. This catalyst shows nearly 90% NOxconversion in a temperature range of 150°C~250 °C at a space velocity of 53000 h-1.

scholarly journals Insights into the promotion role of phosphorus doping on carbon as a metal-free catalyst for low-temperature selective catalytic reduction of NO with NH3

RSC Advances ◽  
2020 ◽  
Vol 10 (22) ◽  
pp. 12908-12919
Author(s):  
Weifeng Li ◽  
Shuangling Jin ◽  
Rui Zhang ◽  
Yabin Wei ◽  
Jiangcan Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Carbon Aerogels ◽  
Phosphorus Doping ◽  
Reduction Of No ◽  
Metal Free

P species can effectively enhance the catalytic activity of carbon aerogels for NO reduction at low temperature.

Selective Catalytic Reduction of NOX on Cr-Mn Mixed Oxide at Low Temperature

2011 ◽  
Vol 233-235 ◽  
pp. 1564-1567
Author(s):  
Zhi Hang Chen ◽  
Xue Hui Li ◽  
Chao Ping Cen ◽  
Xiang Gao ◽  
Le Fu Wang
Keyword(s):  
Citric Acid ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Mixed Oxide ◽  
Mixed Oxides ◽  
Catalytic Reduction ◽  
Space Velocity ◽  
Excess Oxygen ◽  
Mixed Oxide Catalysts ◽  
Acid Method

The solid state reaction method, coprecipitation method and citric acid method were employed for the preparation of Cr-Mn mixed-oxide catalysts. Experimental results showed that this catalytic system has good selective catalytic reduction (SCR) properties of NOxby ammonia in the presence of excess oxygen at low temperature (80-220°C). 97.8% conversion of NOxwith 100% selectivity of N2had been achieved on Cr-MnOxmixed oxide prepared by the citric acid method at 120°C with the space velocity of 30,000 h-1. X-ray diffraction, BET were adopted for the characterization of the active phase. The characterization results showed that a new crystal phase CrMn1.5O4generated in mixed oxides which was the active center of the Cr-Mn catalysts.

Synthesis of MnNi–SAPO-34 by a one-pot hydrothermal method and its excellent performance for the selective catalytic reduction of NO by NH3

2017 ◽  
Vol 7 (21) ◽  
pp. 4984-4995 ◽  
Author(s):  
Rui Li ◽  
Zhibin Li ◽  
Liqiang Chen ◽  
Yongli Dong ◽  
Shibo Ma ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Selective Catalytic Reduction ◽  
Hydrothermal Method ◽  
Strong Interaction ◽  
Catalytic Reduction ◽  
Synthesis Method ◽  
Excellent Performance ◽  
One Pot ◽  
Reduction Of No ◽  
Ni Species

MnNi–SAPO-34 with Mn and Ni incorporated in the framework of SAPO-34 prepared by a one-pot hydrothermal synthesis method exhibits excellent NH3-SCR activity, which is attributed to the strong interaction between the Mn and Ni species.

V2O5-WO3/TiO2 Catalysts for Low Temperature NH3 SCR: Catalytic Activity and Characterization

2016 ◽  
Vol 697 ◽  
pp. 275-278 ◽  
Author(s):  
Yu Xin Deng ◽  
Xin Chen ◽  
Rong Shao ◽  
Li Ming Hu ◽  
Jie Tang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Surface Area ◽  
Catalytic Reduction ◽  
Anatase Phase ◽  
Systematic Investigation ◽  
Acid Sites ◽  
Bet Surface Area ◽  
Reduction Of No

A systematic investigation of the effect of WO3 loading over V2O5/TiO2 catalysts was carried out for the selective catalytic reduction of NO by NH3. The characteristics were examined use BET surface area , X-ray diffractometry (XRD) , Temperature programmed desorption (TPD) of NH3 . It was fund that the WO3 species could interact with the TiO2 anatase phase to exhibits a high activity. With increasing WO3 content ,the activity of V-W/TiO2 for the selective catalytic reduction of NO by NH3 was improved at low temperatures in the range of 3～7%. The results showed that the adding of WO3 to V2O5/TiO2 could result in exposing acid sites of catalysts doped WO3 at low temperature. Furthermore, especially the catalytic activity of VW7Ti showed higher than 80% at 180 °C. However, the catalytic BET surface area and the mass of acid sites not play a leading role for improving low-temperature activity of VWTi in this paper.

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