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 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.

scholarly journals NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 384 ◽  
Author(s):  
Ruonan Wang ◽  
Xu Wu ◽  
Chunlei Zou ◽  
Xiaojian Li ◽  
Yali Du
Keyword(s):  
Selective Catalytic Reduction ◽  
Calcination Temperature ◽  
Mixed Oxide ◽  
Catalytic Reduction ◽  
Catalytic Performance ◽  
Mixed Oxide Catalysts ◽  
Nh3 Scr ◽  
Redox Capacity ◽  
So2 Resistance ◽  
Catalytic Stability

A series of NiFe mixed oxide catalysts were prepared via calcining hydrotalcite-like precursors for the selective catalytic reduction of nitrogen oxides (NOx) with NH3 (NH3-SCR). Multiple characterizations revealed that catalytic performance was highly dependent on the phase composition, which was vulnerable to the calcination temperature. The MOx phase (M = Ni or Fe) formed at a lower calcination temperature would induce more favorable contents of Fe2+ and Ni3+ and as a result contribute to the better redox capacity and low-temperature activity. In comparison, NiFe2O4 phase emerged at a higher calcination temperature, which was expected to generate more Fe species on the surface and lead to a stable structure, better high-temperature activity, preferable SO2 resistance, and catalytic stability. The optimum NiFe-500 catalyst incorporated the above virtues and afforded excellent denitration (DeNOx) activity (over 85% NOx conversion with nearly 98% N2 selectivity in the region of 210–360 °C), superior SO2 resistance, and catalytic stability.

Highly active behaviors of CeO2–CrOx mixed oxide catalysts in deep oxidation of 1,2-dichloroethane

2014 ◽  
Vol 393 ◽  
pp. 75-83 ◽  
Author(s):  
Peng Yang ◽  
Zhonghua Meng ◽  
Shanshan Yang ◽  
Zhinan Shi ◽  
Renxian Zhou
Keyword(s):  
Mixed Oxide ◽  
Deep Oxidation ◽  
Oxide Catalysts ◽  
Mixed Oxide Catalysts ◽  
Highly Active

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.

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
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