Preparation of Cu/Co/Fe Mixed Oxides and their Catalytic Behavior on HC-SCR DeNOx

2014 ◽  
Vol 1033-1034 ◽  
pp. 1058-1062 ◽  
Author(s):  
Hong Bo Liu ◽  
Zhi Yong Huang ◽  
Lin Jie Li ◽  
Jun Ting Huang ◽  
Zhi Cong He ◽  
...  
Keyword(s):  
Mixed Oxides ◽  
Catalytic Reduction ◽  
Homogeneous Distribution ◽  
Catalytic Behavior ◽  
Reduction Of No ◽  
Catalytic Activities ◽  
Structure And Morphology ◽  
Surface Areas ◽  
Nox Conversion ◽  
Specific Surface Areas

Co/Cu/Fe mixed oxides (Co/Cu/Fe-MOs) were prepared by calcination of Cu/Co/Fe hydrotalcites (Co/Cu/Fe-HTs) precursors. Their structure and morphology were characterized by XRD, TGA, IR and SEM. Co/Cu/Fe-MOs were used for selective catalytic reduction of NO by hydrocarbon. Their catalytic activities were studied by NOx analyzer. The results show that Co/Cu/Fe-MOs have homogeneous distribution of hexagon with particles size around 30~50nm and the specific surface areas are around 70~110 m2∙g–1. Cu2Co8Fe5-MOs sample exhibits the highest NOx conversion of 32%. Co/Cu/Fe-MOs with lower calcination temperature have higher catalytic activities.

Iron-manganese-magnesium mixed oxides catalysts for selective catalytic reduction of NO x with NH3

2017 ◽  
Vol 34 (6) ◽  
pp. 1858-1866 ◽  
Author(s):  
Kang Zhang ◽  
Liting Xu ◽  
Shengli Niu ◽  
Chunmei Lu ◽  
Dong Wang ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Mixed Oxides ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Iron Manganese ◽  
Manganese Magnesium

Characterization and activity of alkaline earth metals loaded CeO2–MOx (M = Mn, Fe) mixed oxides in catalytic reduction of NO

2014 ◽  
Vol 143 (3) ◽  
pp. 921-928 ◽  
Author(s):  
Seyed Mahdi Mousavi ◽  
Aligholi Niaei ◽  
María José Illán Gómez ◽  
Dariush Salari ◽  
Parvaneh Nakhostin Panahi ◽  
...  
Keyword(s):  
Alkaline Earth ◽  
Mixed Oxides ◽  
Catalytic Reduction ◽  
Alkaline Earth Metals ◽  
Reduction Of No

Washcoating of cordierite honeycomb with vanadia–tungsta–titania mixed oxides for selective catalytic reduction of NO with NH3

2015 ◽  
Vol 5 (2) ◽  
pp. 1241-1250 ◽  
Author(s):  
Bo Liu ◽  
Jun Du ◽  
Xiaowei Lv ◽  
Yue Qiu ◽  
Changyuan Tao
Keyword(s):  
Mechanical Strength ◽  
Selective Catalytic Reduction ◽  
Mixed Oxides ◽  
Catalytic Reduction ◽  
Crucial Issue ◽  
Reduction Of No ◽  
Practical Applications ◽  
Cordierite Honeycomb ◽  
The Cost

The application of monolithic coated catalysts to NOx abatement is a crucial issue for practical applications to enhance the mechanical strength, economize the cost, facilitate recycling etc., compared with the conventional monolithic extrusive catalysts.

CATALYTIC ACTIVITY FOR METHANE OXIDATION OF GOETHITE SUPPORTED ON ALUMINA

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4249-4254 ◽  
Author(s):  
KEI-ICHIRO MURAI ◽  
KOHEI TOMITA ◽  
SUGURU TOJO ◽  
TOSHIHIRO MORIGA ◽  
ICHIRO NAKABAYASHI
Keyword(s):  
Catalytic Activity ◽  
Specific Surface ◽  
Methane Oxidation ◽  
Model Experiment ◽  
The Other ◽  
Catalytic Activities ◽  
Surface Areas ◽  
Oxidation Of Methane ◽  
Other Hand ◽  
Specific Surface Areas

Two kinds of α- Fe 2 O 3 catalysts supported on χ- Al 2 O 3 and γ- Al 2 O 3 were synthesized. α- Fe 2 O 3 was prepared from α- FeOOH . As a model experiment, an investigation was made with the oxidation of methane. As all catalysts with various Fe contents supported on χ- Al 2 O 3 with various Fe contents had higher specific surface areas than those supported on γ- Al 2 O 3, α- Fe 2 O 3/χ- Al 2 O 3 catalyst has higher catalytic activities than α- Fe 2 O 3/γ- Al 2 O 3 catalyst. From SEM-EDS analyses, it is concluded that in α- Fe 2 O 3/χ- Al 2 O 3 catalyst, α- Fe 2 O 3 exists mainly on the surface of the support, because of flatness of the surface of χ- Al 2 O 3. On the other hand, in the case of α- Fe 2 O 3/γ- Al 2 O 3 catalyst, as the surface of support, γ- Al 2 O 3, is uneven, α- Fe 2 O 3 do not partially exist on the surface but in the pores.

Cu-Supported on Sodium-Treated Sepiolite for Selective Catalytic Reduction of NO by Propylene

2015 ◽  
Vol 1088 ◽  
pp. 569-572
Author(s):  
Zhi Hao Zhang ◽  
Yang Li ◽  
Yun Fang Qi ◽  
Qing Ye ◽  
Shu Lan Ji ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
High Performance ◽  
Catalytic Reduction ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Redox Species ◽  
Reduction Of No ◽  
Catalytic Activities ◽  
Scr Of No ◽  
Activity Center

Cu/Na-Sep samples were prepared by the incipient wetness impregnation method. These catalysts were characterized by means of XRF, XRD, and XPS techniques, and their catalytic activities were performed by the SCR of NO with propylene. The results show that the Cu/Na-Sep catalyst exhibited the high performance in the C3H6-SCR of NO. After investigation by XRD and XPS, the result showed that there are Cu2+/Cu+redox species as a reaction activity center over Cu/Na-Sep.

Structures and Catalytic Activities of LaSrCoO4 and LaSrCoO3.6F0.4 Mixed Oxides

2011 ◽  
Vol 55-57 ◽  
pp. 1957-1961
Author(s):  
Xiao Mao Yang
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Oxygen Vacancies ◽  
Mixed Oxides ◽  
Lattice Oxygen ◽  
Gel Method ◽  
Catalytic Activities ◽  
Surface Areas ◽  
Better Than

The perovskite-like LaSrCoO4and LaSrCoO3.6F0.4mixed oxides were prepared by the polyglycol gel method, investigated by using the XRD, TEM, BET, O2-TPD and XPS methods, and used successfully for CO and C3H8oxidization. The results indicate that LaSrCoO4and LaSrCoO3.6F0.4mixed oxides have K2NiF4structure. The catalytic activity of LaSrCoO4is better than that of LaSrCoO3.6F0.4, this is explained in terms of more mobile lattice oxygen, higher content of Co3+, more oxygen vacancies, smaller particle size and larger BET surface areas of LaSrCoO4.

scholarly journals Surface and Catalytic Properties of NiO–Fe2O3 Solids Supported on Al2O3

1996 ◽  
Vol 13 (5) ◽  
pp. 409-421 ◽  
Author(s):  
G.A. El-Shobaky ◽  
A.M. Ghozza ◽  
N.M. Deraz
Keyword(s):  
Rate Constant ◽  
Reaction Rate ◽  
Catalytic Properties ◽  
Unit Area ◽  
Surface Characteristics ◽  
Reaction Rate Constant ◽  
Oxidation Of Co ◽  
Catalytic Activities ◽  
Surface Areas ◽  
Specific Surface Areas

A series of NiO–Fe2O3 catalysts supported on γ-Al2O3 was prepared. The effect of the NiO and Fe2O3 contents and the precalcination temperature on the surface and catalytic properties of the various solids has been investigated. The surface characteristics, viz. SBET, Vp and r, were determined using N2 adsorption conducted at –196°C. The catalytic activities of the various solids were studied using the oxidation of CO by O2 at temperatures in the range between 150°C and 400°C. The prepared solids were preheated in air at various temperatures between 400°C and 1000°C. The results obtained revealed that the SBET values of the different solids decrease progressively on increasing the precalcination temperature above 400°C due to sintering. The specific surface areas were also found to decrease on increasing both the NiO and Fe2O3 contents. The catalytic activities, expressed as reaction rate constant (k) and reaction rate constant per unit area (k), were found to decrease on increasing the precalcination temperature in the range 400–1000°C. Furthermore, the amounts of NiO and Fe2O3 in the different solids modified their catalytic activities in different manners.

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