Highly dispersed Fe–Ce mixed oxide catalysts confined in mesochannels toward low-temperature oxidation of formaldehyde

2020 ◽  
Vol 8 (33) ◽  
pp. 17174-17184
Author(s):  
Jianwei Fan ◽  
Xufei Niu ◽  
Wei Teng ◽  
Peng Zhang ◽  
Wei-xian Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalytic Oxidation ◽  
Mixed Oxide ◽  
Mixed Oxides ◽  
Oxide Catalysts ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Mixed Oxide Catalysts ◽  
Highly Dispersed

Highly dispersed Fe–Ce mixed oxides confined in mesochannels are prepared by two-step impregnation–calcination, achieving superior catalytic oxidation of HCHO (9.8 μg L−1) with 65 and 94.9% at 30 and 60 °C, respectively.

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.

Low-temperature catalytic oxidation of toluene over Mn–Co–O/Ce0.65Zr0.35O2 mixed oxide catalysts

2017 ◽  
Vol 72 (1) ◽  
pp. 161-172 ◽  
Author(s):  
Jie Feng ◽  
Zhong-Yan Hou ◽  
Xiao-Ying Zhou ◽  
Hai-Long Zhang ◽  
Tian-Qiong Cheng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalytic Oxidation ◽  
Mixed Oxide ◽  
Oxide Catalysts ◽  
Mixed Oxide 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.

scholarly journals Co-Mn-Al Mixed Oxides Promoted by K for Direct NO Decomposition: Effect of Preparation Parameters

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 593 ◽  
Author(s):  
Pacultová ◽  
Bílková ◽  
Klegova ◽  
Karásková ◽  
Fridrichová ◽  
...  
Keyword(s):  
Mixed Oxide ◽  
Alkali Metals ◽  
Mixed Oxides ◽  
Oxide Catalysts ◽  
No Decomposition ◽  
Selective Catalyst ◽  
Mixed Oxide Catalysts ◽  
Preparation Conditions ◽  
Fundamental Research

Fundamental research on direct NO decomposition is still needed for the design of a sufficiently active, stable and selective catalyst. Co-based mixed oxides promoted by alkali metals are promising catalysts for direct NO decomposition, but which parameters play the key role in NO decomposition over mixed oxide catalysts? How do applied preparation conditions affect the obtained catalyst’s properties?

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