NO reduction by hydrocarbons in an oxidizing atmosphere over transition metal-zirconium mixed oxides

1994 ◽  
Vol 25 (1-2) ◽  
pp. 37-48 ◽  
Author(s):  
Kathleen A. Bethke ◽  
David Alt ◽  
Mayfair C. Kung
Keyword(s):  
Transition Metal ◽  
No Reduction ◽  
Mixed Oxides ◽  
Oxidizing Atmosphere

NO reduction with NH3 under oxidizing atmosphere on copper loaded hydroxyapatite

2012 ◽  
Vol 113-114 ◽  
pp. 255-260 ◽  
Author(s):  
Jihène Jemal ◽  
Hassib Tounsi ◽  
Kamel Chaari ◽  
Carolina Petitto ◽  
Gérard Delahay ◽  
...  
Keyword(s):  
No Reduction ◽  
Oxidizing Atmosphere

Facile fabrication of hollow tubular mixed oxides for selective catalytic reduction of NOx at low temperature: a combined experimental and theoretical study

2017 ◽  
Vol 53 (5) ◽  
pp. 967-970 ◽  
Author(s):  
Xiuyun Wang ◽  
Zhixin Lan ◽  
Yi Liu ◽  
Yongjin Luo ◽  
Jianjun Chen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Theoretical Study ◽  
Mixed Oxides ◽  
Catalytic Reduction ◽  
Heating Rates ◽  
Facile Fabrication ◽  
Reduction Of Nox

The 1D nanowire or hollow tubular structure of various transition metal oxides can be tuned by controlling heating rates.

Morphology controlled surface sulfurized CoMn2O4 microspikes electrocatalyst for water splitting with excellent OER rate for binder-free electrocatalytic oxygen evolution

2021 ◽  
Author(s):  
Ali Bahadur ◽  
Waseem Hussain ◽  
Shahid Iqbal ◽  
Farman Ullah ◽  
Muhammad Shoaib ◽  
...  
Keyword(s):  
Transition Metal ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Electrocatalytic Activity ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Binder Free ◽  
Synthesis Routes

Transition metal mixed oxides have drawn extensive interest as oxygen evolution electrocatalysts alternatives to noble metals-based material but generally involve prolonged synthesis routes and limited electrocatalytic activity and stability. Herein...

scholarly journals Highly Active Transition Metal-Promoted CuCeMgAlO Mixed Oxide Catalysts Obtained from Multicationic LDH Precursors for the Total Oxidation of Methane

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 613
Author(s):  
Hussein Mahdi S. Al-Aani ◽  
Mihaela M. Trandafir ◽  
Ioana Fechete ◽  
Lucia N. Leonat ◽  
Mihaela Badea ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transition Metal ◽  
Mixed Oxide ◽  
Mixed Oxides ◽  
Catalytic Performance ◽  
Atomic Ratio ◽  
Total Oxidation ◽  
X Ray ◽  
Oxidation Of Methane ◽  
Al2o3 Catalyst

To improve the catalytic performance of an active layered double hydroxide (LDH)-derived CuCeMgAlO mixed oxide catalyst in the total oxidation of methane, it was promoted with different transition-metal cations. Thus, two series of multicationic mixed oxides were prepared by the thermal decomposition at 750 °C of their corresponding LDH precursors synthesized by coprecipitation at constant pH of 10 under ambient atmosphere. The first series of catalysts consisted of four M(3)CuCeMgAlO mixed oxides containing 3 at.% M (M = Mn, Fe, Co, Ni), 15 at.% Cu, 10 at.% Ce (at.% with respect to cations), and with Mg/Al atomic ratio fixed to 3. The second series consisted of four Co(x)CuCeMgAlO mixed oxides with x = 1, 3, 6, and 9 at.% Co, while keeping constant the Cu and Ce contents and the Mg/Al atomic ratio. All the mixed oxides were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) coupled with X-ray energy dispersion analysis (EDX), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption at −196 °C, temperature-programmed reduction under hydrogen (H2-TPR), and diffuse reflectance UV-VIS spectroscopy (DR UV-VIS), while thermogravimetric and differential thermal analyses (TG-DTG-DTA) together with XRD were used for the LDH precursors. The catalysts were evaluated in the total oxidation of methane, a test reaction for volatile organic compounds (VOC) abatement. Their catalytic performance was explained in correlation with their physicochemical properties and was compared with that of a reference Pd/Al2O3 catalyst. Among the mixed oxides studied, Co(3)CuCeMgAlO was found to be the most active catalyst, with a temperature corresponding to 50% methane conversion (T50) of 438 °C, which was only 19 °C higher than that of a reference Pd/Al2O3 catalyst. On the other hand, this T50 value was ca. 25 °C lower than that observed for the unpromoted CuCeMgAlO system, accounting for the improved performance of the Co-promoted catalyst, which also showed a good stability on stream.

scholarly journals Selective Oxidation of Glycerol Using 3% H2O2 Catalyzed by Supported Nano-Au Catalysts

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 505 ◽  
Author(s):  
Xiaoli Wang ◽  
Gongde Wu ◽  
Tongfa Jin ◽  
Jie Xu ◽  
Shihao Song
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Selective Oxidation ◽  
Mixed Oxide ◽  
Transition Metal Oxides ◽  
Mixed Oxides ◽  
Catalytic Performance ◽  
Glyceric Acid ◽  
Glycerol Conversion ◽  
Composition And Structure

A series of transition metal oxides or mixed oxides supported nano-Au catalysts were prepared for the selective oxidation of glycerol to glyceric acid using 3% H2O2. It was found that the composition and structure of supports significantly influenced the catalytic performance of catalysts. The mesoporous trimetal mixed oxide (CuNiAlO) supported nano-Au catalysts were more active in comparison with the others. In the present catalytic system, the highest glycerol conversion was 90.5%, while the selectivity of glyceric acid could reach 72%. Moreover, the catalytic performance remained after 11 times of reaction.

Transition metal-aluminate catalysts for NO reduction by C3H6

1998 ◽  
Vol 18 (1-2) ◽  
pp. 163-170 ◽  
Author(s):  
Ken-ichi Shimizu ◽  
Hajime Maeshima ◽  
Atsushi Satsuma ◽  
Tadashi Hattori
Keyword(s):  
Transition Metal ◽  
No Reduction ◽  
Catalysts For No Reduction

On the possibility of formation of 3d-transition metal mixed oxides with spinel structure

1985 ◽  
Vol 95 (1) ◽  
pp. 155-158 ◽  
Author(s):  
D. Mehandjiev ◽  
E. Zhecheva ◽  
S. Angelov
Keyword(s):  
Transition Metal ◽  
Spinel Structure ◽  
Mixed Oxides
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