Promoter effect of Pd species on Mn oxide catalysts supported on rare-earth-iron mixed oxide

2016 ◽  
Vol 6 (21) ◽  
pp. 7868-7874 ◽  
Author(s):  
Saburo Hosokawa ◽  
Ryohei Tada ◽  
Takuya Shibano ◽  
Shogo Matsumoto ◽  
Kentaro Teramura ◽  
...  
Keyword(s):  
Rare Earth ◽  
Mixed Oxide ◽  
Catalytic Performance ◽  
Hexagonal Structure ◽  
Oxide Catalysts ◽  
Promoter Effect ◽  
Mn Oxide ◽  
Effect Of Pd

The loading of a small amount of Pd species dramatically promotes a catalytic performance of MnOx species located on the hexagonal structure of YbFeO3.

scholarly journals Statistically Guided Synthesis of MoV-Based Mixed-Oxide Catalysts for Ethane Partial Oxidation

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 370
Author(s):  
Juan Jimenez ◽  
Kathleen Mingle ◽  
Teeraya Bureerug ◽  
Cun Wen ◽  
Jochen Lauterbach
Keyword(s):  
Acetic Acid ◽  
Partial Oxidation ◽  
Mixed Oxide ◽  
Structural Integrity ◽  
Product Distribution ◽  
Catalytic Performance ◽  
Oxide Catalysts ◽  
Acid Yield ◽  
Mixed Oxide Catalysts ◽  
Catalyst Composition

The catalytic performance of Mo8V2Nb1-based mixed-oxide catalysts for ethane partial oxidation is highly sensitive to the doping of elements with redox and acid functionality. Specifically, control over product distributions to ethylene and acetic acid can be afforded via the specific pairing of redox elements (Pd, Ni, Ti) and acid elements (K, Cs, Te) and the levels at which these elements are doped. The redox element, acid element, redox/acid ratio, and dopant/host ratio were investigated using a three-level, four-factor factorial screening design to establish relationships between catalyst composition, structure, and product distribution for ethane partial oxidation. Results show that the balance between redox and acid functionality and overall dopant level is important for maximizing the formation of each product while maintaining the structural integrity of the host metal oxide. Overall, ethylene yield was maximized for a Mo8V2Nb1Ni0.0025Te0.5 composition, while acetic acid yield was maximized for a Mo8V2Nb1Ti0.005Te1 catalyst.

Effects of Carrier on Supported Rare Earth Double Perovskite Oxide Catalysts for Catalytic Combustion of Methane

2012 ◽  
Vol 512-515 ◽  
pp. 1601-1606 ◽  
Author(s):  
Ran Ran Ding ◽  
Jia Nan Hu ◽  
Rui Sheng Hu ◽  
Ying Liu ◽  
Ling Jie Wang
Keyword(s):  
Rare Earth ◽  
Catalytic Combustion ◽  
Supported Catalyst ◽  
Double Perovskite ◽  
Active Phase ◽  
Catalytic Performance ◽  
Oxide Catalysts ◽  
Perovskite Oxide ◽  
Impregnation Method ◽  
Oxide Support

Supported rare earth double perovskite (La2MnNiO6) oxide catalysts were prepared by incipient wet impregnation method for methane catalytic combustion, and effects of the support (Al2O3, ZrO2 and MgO) were investigated. The loaded catalysts were characterized by means of XRD, TPR, SEM techniques and their catalytic activities were tested by complete methane oxidation. Depending on the different oxide carrier (e.g. Al2O3, MgO and ZrO2), catalysts have different catalytic properties, because the interaction of metal oxide-support will affect both redox property and dispersity of the active phase. The results on catalysts have shown that the dispersion on Al2O3 and MgO supports had an effect to enhance the catalytic performances of the catalysts that had been treated at 1100 oC. The activity of ZrO2 supported catalyst significantly decreases when calcination temperature at is 1100 oC. The dispersity of the active phase and the nature of the oxide carrier played an important role in the catalytic performance.

scholarly journals Effect of calcination temperature on the structure and catalytic performance of copper–ceria mixed oxide catalysts in phenol hydroxylation

RSC Advances ◽  
2017 ◽  
Vol 7 (21) ◽  
pp. 12586-12597 ◽  
Author(s):  
Othmane Amadine ◽  
Younes Essamlali ◽  
Aziz Fihri ◽  
Mohamed Larzek ◽  
Mohamed Zahouily
Keyword(s):  
Calcination Temperature ◽  
Mixed Oxide ◽  
Catalytic Performance ◽  
Oxide Catalysts ◽  
Template Method ◽  
Phenol Hydroxylation ◽  
Mixed Oxide Catalysts ◽  
Highly Active ◽  
Different Temperatures

We report on highly active CuO@CeO2 catalysts prepared by the surfactant-template method and calcined at different temperatures.

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.

Catalytic performance in methane combustion of rare-earth perovskites RECo0.50Mn0.50O3 (RE: La, Er, Y)

2011 ◽  
Vol 172 (1) ◽  
pp. 111-117 ◽  
Author(s):  
Gina Pecchi ◽  
Claudia Campos ◽  
Octavio Peña
Keyword(s):  
Rare Earth ◽  
Methane Combustion ◽  
Catalytic Performance

True Catalytically Active Structure in Mo–V-Based Mixed Oxide Catalysts for Selective Oxidation of Acrolein

ACS Catalysis ◽  
2021 ◽  
pp. 10294-10307
Author(s):  
Satoshi Ishikawa ◽  
Yudai Yamada ◽  
Naoki Kashio ◽  
Nagisa Noda ◽  
Kosuke Shimoda ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Mixed Oxide ◽  
Oxide Catalysts ◽  
Active Structure ◽  
Mixed Oxide Catalysts ◽  
Catalytically Active

Synthesis of glycerol carbonate from glycerol and urea over tin-tungsten mixed oxide catalysts

2014 ◽  
Vol 469 ◽  
pp. 165-172 ◽  
Author(s):  
K. Jagadeeswaraiah ◽  
Ch. Ramesh Kumar ◽  
P.S. Sai Prasad ◽  
S. Loridant ◽  
N. Lingaiah
Keyword(s):  
Mixed Oxide ◽  
Oxide Catalysts ◽  
Glycerol Carbonate ◽  
Mixed Oxide Catalysts
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