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.

Fe and Mn mixed oxide catalysts supported on Sn-modified TiO2 for the selective catalytic reduction of NO with NH3 at low temperature

2022 ◽  
Author(s):  
Zhitao Han ◽  
Huan Du ◽  
Duo Xu ◽  
Yu Gao ◽  
Shaolong Yang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Mixed Oxide ◽  
Catalytic Reduction ◽  
Oxide Catalysts ◽  
Reduction Of No ◽  
Sn Doping ◽  
Mixed Oxide Catalysts ◽  
Fe And Mn ◽  
Low Temperature Scr

FeMn/SnxTiO2 catalysts were synthesized by introducing Sn as an additive to modify TiO2 supports, and the Sn doping could improve the SO2 tolerance and low-temperature SCR activity significantly.

Cr–MnOx mixed-oxide catalysts for selective catalytic reduction of NOx with NH3 at low temperature

2010 ◽  
Vol 276 (1) ◽  
pp. 56-65 ◽  
Author(s):  
Zhihang Chen ◽  
Qing Yang ◽  
Hua Li ◽  
Xuehui Li ◽  
Lefu Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Mixed Oxide ◽  
Catalytic Reduction ◽  
Oxide Catalysts ◽  
Mixed Oxide Catalysts ◽  
Reduction Of Nox

scholarly journals Selective catalytic reduction of NOx by low-temperature NH3 over MnxZr1 mixed-oxide catalysts

RSC Advances ◽  
2022 ◽  
Vol 12 (3) ◽  
pp. 1341-1351
Author(s):  
Shuaibo Zhang ◽  
Haixia Li ◽  
Anchao Zhang ◽  
Zhijun Sun ◽  
Xinmin Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Mixed Oxide ◽  
Catalytic Reduction ◽  
Oxide Catalysts ◽  
Coprecipitation Method ◽  
Mixed Oxide Catalysts ◽  
Reduction Of Nox

MnxZr1 series catalysts were prepared by a coprecipitation method.

scholarly journals Low Temperature deNOx Catalytic Activity with C2H4 as a Reductant Using Mixed Metal Fe-Mn Oxides Supported on Activated Carbon

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4341 ◽  
Author(s):  
Fang Liu ◽  
Li Yang ◽  
Jie Cheng ◽  
Xin Wu ◽  
Wenbin Quan ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Low Temperature ◽  
Mixed Oxide ◽  
Active Sites ◽  
Mixed Oxides ◽  
Catalytic Reduction ◽  
Oxide Catalysts ◽  
Catalyst Stability ◽  
No Conversion ◽  
Mixed Oxide Catalysts

The selective catalytic reduction of NOx (deNOx) at temperatures less than or at 200 °C was investigated while using C2H4 as the reductant and mixed oxides of Fe and Mn supported on activated carbon; their activity was compared to that of MnOx and FeOx separately supported on activated carbon. The bimetallic oxide compositions maintained high NO conversion of greater than 80–98% for periods that were three times greater than those of the supported monometallic oxides. To examine potential reasons for the significant increases in activity maintenance, and subsequent deactivation, the catalysts were examined by using bulk and surface sensitive analytical techniques before and after catalyst testing. No significant changes in Brunauer-Emmett-Teller (BET) surface areas or porosities were observed between freshly-prepared and tested catalysts whereas segregation of FeOx and MnOx species was readily observed in the mono-oxide catalysts after reaction testing that was not detected in the mixed oxide catalysts. Furthermore, x-ray diffraction and Raman spectroscopy data detected cubic Fe3Mn3O8 in both the freshly-prepared and reaction-tested mixed oxide catalysts that were more crystalline after testing. The presence of this compound, which is known to stabilize multivalent Fe species and to enhance oxygen transfer reactions, may be the reason for the high and relatively stable NO conversion activity, and its increased crystallinity during longer-term testing may also decrease surface availability of the active sites responsible for NO conversion. These results point to a potential of further enhancing catalyst stability and activity for low temperature deNOx that is applicable to advanced SCR processing with lower costs and less deleterious side effects to processing equipment.

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.

Low-Temperature Selective Catalytic Reduction of NOx with NH3 over Novel Mn–Zr Mixed Oxide Catalysts

2014 ◽  
Vol 53 (7) ◽  
pp. 2647-2655 ◽  
Author(s):  
Jianliang Zuo ◽  
Zhihang Chen ◽  
Furong Wang ◽  
Yinghao Yu ◽  
Lefu Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Mixed Oxide ◽  
Catalytic Reduction ◽  
Oxide Catalysts ◽  
Mixed Oxide Catalysts ◽  
Reduction Of Nox
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