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.

Synergetic Effects between Al2O3 and HZSM-5 for NO Reduction by CH4

2011 ◽  
Vol 214 ◽  
pp. 364-368
Author(s):  
Li Li Ren ◽  
Xiao Mei Pan
Keyword(s):  
Catalytic Activity ◽  
Selective Catalytic Reduction ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Synergetic Effect ◽  
Separate Component ◽  
Reduction Of No ◽  
Synergetic Effects

Three different kinds of Al2O3 have been added to HZSM-5 for improving its activity towards selective catalytic reduction of NO with CH4 in the presence of excess of oxygen. Higher conversions of NO have been observed for all of the three mixed catalysts, the conversion of which were also found to be higher than that of each separate component of the catalysts. It was concluded that there exists a synergetic effect between Al2O3 and HZSM-5. The addition of Al2O3 can improve the catalytic activity of HZSM-5 by inhibiting the decomposing of NO2 to NO and accelerating the activation of methane. Adsorbed NO2 is then reduced by the activated methane or the intermediates formed from activated methane to N2 over the Brønsted site of zeolite.

The Effect of Iron Doping on the Performance of Mn/TiO2 Catalysts for NO Reduction with NH3 at Low Temperature

2013 ◽  
Vol 864-867 ◽  
pp. 1415-1420
Author(s):  
Jie Nan Hong ◽  
Wei Guo Pan ◽  
Rui Tang Guo ◽  
Wen Long Zhen ◽  
Yue Liang Yu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Poor Performance ◽  
Acid Sites ◽  
Iron Doping ◽  
Reduction Of No ◽  
Catalysts For No Reduction ◽  
Redox Ability

The catalysts of Mn/TiO2, Fe/TiO2and Mn-Fe/TiO2prepared by coprecipitation method were investigated for low temperature selective catalytic reduction of NO with NH3. The catalytic activity and SO2resistance of these three catalysts were tested and the properties of the catalysts were characterized by using N2-BET, XRD, H2-TPR, NH3-TPD methods. It was found that the doping of iron reduced the catalytic activity of Mn/TiO2catalyst at low temperature and also has an adverse effect for its SO2resistance at the same time. The decrease of surface area , redox ability and surface acid sites caused by doping of iron might be the main reasons for poor performance of this catalyst.

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.

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.

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