A Novel Active Ni-Ce-Al-Mixed Oxide Catalysts for Oxidative Dehydrogenation of Propane

2013 ◽  
Vol 724-725 ◽  
pp. 1098-1102 ◽  
Author(s):  
A. Ruheng ◽  
Jiang Wang ◽  
Zhao Ri Ge Tu Bao
Keyword(s):  
Oxidative Dehydrogenation ◽  
Mixed Oxide ◽  
Mixed Oxides ◽  
High Surface ◽  
High Surface Area ◽  
Oxide Catalysts ◽  
Coke Deposition ◽  
Oxidative Dehydrogenation Of Propane ◽  
Mixed Oxide Catalysts ◽  
Wide Range

Ni-Ce-Al layered double hydroxides (LDHs) with various Ni:Ce:Al molar ratios (3: 0.1:0.9, 3:0.2:0.8 and 3:0.5:0.5) were prepared by Co-precipitation. Ce can replace Al in a wide range of Ce/Al ratios to form Ni-Ce-Al-LDH with the unique layered structure of hydrotalcite. After the calcined at 600°C, LDHs samples were converted to mesoporous NiO-CeO2mixed oxides with a high surface area. The Ni-Ce-Al mixed oxide catalysts exhibit superior catalytic activity in oxidative dehydrogenation of propane and the excellent activities were attributed to mesoporous structure and the suppression of coke deposition.

Activity studies of vanadium, iron, carbon and mixed oxides based catalysts for the oxidative dehydrogenation of ethylbenzene to styrene: a review

2015 ◽  
Vol 5 (12) ◽  
pp. 5062-5076 ◽  
Author(s):  
Itika Kainthla ◽  
Jayesh T. Bhanushali ◽  
Rangappa S. Keri ◽  
Bhari Mallanna Nagaraja
Keyword(s):  
Oxidative Dehydrogenation ◽  
Mixed Oxide ◽  
Active Carbon ◽  
Mixed Oxides ◽  
Oxide Catalysts ◽  
Mixed Oxide Catalysts ◽  
Vanadium Iron ◽  
Dehydrogenation Of Ethylbenzene ◽  
Oxidative Dehydrogenation Of Ethylbenzene ◽  
Carbon Based

The activity of V, Fe and carbon based catalysts depends on V5+, Fe3+and active carbon sites. The mixed oxide catalysts show superior activity than individual oxides.

scholarly journals Influence of Vanadium Oxidation States on the Performance of V-Mg-Al Mixed-Oxide Catalysts for the Oxidative Dehydrogenation of Propane

2019 ◽  
Vol 54 (2) ◽  
Author(s):  
Leticia Schacht ◽  
Juan Navarrete ◽  
Persi Schacht ◽  
Marco A. Ramírez
Keyword(s):  
Catalytic Activity ◽  
Oxidative Dehydrogenation ◽  
Oxidation State ◽  
Mixed Oxide ◽  
Catalytic Performance ◽  
Oxide Catalysts ◽  
Oxidative Dehydrogenation Of Propane ◽  
Mixed Oxide Catalysts ◽  
Before And After ◽  
Temperature Programmed

V-Mg-Al mixed-oxide catalysts for oxidative dehydrogenation of propane were prepared by thermal decomposition of Mg-Al-layered double hydroxides with vanadium interlayer doping. The obtained catalysts were tested for the oxidative dehydrogenation of propane, obtaining good results in catalytic activity (conversion 16.55 % and selectivity 99.97 %). Results indicated that catalytic performance of these materials depends on how vanadium is integrated in the layered structure, which is determined by the Mg/Al ratio. Vanadium interlayer doping modifies the oxidation state of vanadium and consequently catalytic properties. Surface properties were studied by X-ray photoelectron spectroscopic and diffuse reflectance, UV-visible spectroscopy, and temperature programmed reduction (TPR). The analyses provided information about the oxidation state, before and after the reaction. From these results, it is suggested that selectivity to propylene and catalytic activity depend mainly on vanadium oxidation state.

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?

Catalytic properties of copper–manganese mixed oxides prepared by coprecipitation using tetramethylammonium hydroxide

2014 ◽  
Vol 4 (10) ◽  
pp. 3713-3722 ◽  
Author(s):  
Hisahiro Einaga ◽  
Akihiro Kiya ◽  
Satoru Yoshioka ◽  
Yasutake Teraoka
Keyword(s):  
Aqueous Solution ◽  
Mixed Oxide ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Oxide Catalysts ◽  
Tetramethylammonium Hydroxide ◽  
Mixed Oxide Catalysts ◽  
Metal Nitrates ◽  
Copper Manganese ◽  
Coprecipitation Technique

Copper–manganese (Cu–Mn) mixed oxide catalysts were prepared by a coprecipitation technique from metal nitrates in aqueous solution using tetramethylammonium hydroxide (TMAH) as a pH regulator.

scholarly journals Nitrogen-Doped Graphene Monolith Catalysts for Oxidative Dehydrogenation of Propane

2021 ◽  
Vol 9 ◽  
Author(s):  
Weijie Liu ◽  
Tianlong Cao ◽  
Xueya Dai ◽  
Yunli Bai ◽  
Xingyu Lu ◽  
...  
Keyword(s):  
Surface Area ◽  
Oxidative Dehydrogenation ◽  
High Surface ◽  
High Surface Area ◽  
Oxidative Dehydrogenation Of Propane ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Dehydrogenation Reactions ◽  
Monolith Catalysts

It’s of paramount importance to develop renewable nanocarbon materials to replace conventional precious metal catalysts in alkane dehydrogenation reactions. Graphene-based materials with high surface area have great potential for light alkane dehydrogenation. However, the powder-like state of the graphene-based materials seriously limits their potential industrial applications. In the present work, a new synthetic route is designed to fabricate nitrogen-doped graphene-based monolith catalysts for oxidative dehydrogenation of propane. The synthetic strategy combines the hydrothermal-aerogel and the post thermo-treatment procedures with urea and graphene as precursors. The structural characterization and kinetic analysis show that the monolithic catalyst well maintains the structural advantages of graphene with relatively high surface area and excellent thermal stability. The homogeneous distributed nitrogen species can effectively improve the yield of propylene (5.3% vs. 1.9%) and lower the activation energy (62.6 kJ mol−1 vs. 80.1 kJ mol−1) in oxidative dehydrogenation of propane reaction comparing with un-doped graphene monolith. An optimized doping amount at 1:1 weight content of the graphene to urea precursors could exhibit the best catalytic performance. The present work paves the way for developing novel and efficient nitrogen-doped graphene monolithic catalysts for oxidative dehydrogenation reactions of propane.

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