Ce/Cr and Ce/Co modified ferrite catalysts for high temperature water-gas shift reaction at elevated pressures

Damma, Devaiah; Welton, Aaron; Boolchand, P.; Dong, Junhang; Smirniotis, Panagiotis G.

doi:10.1016/j.jcat.2021.11.032

Cited by 10 publications

(6 citation statements)

References 50 publications

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“…[ 16,43,44 ] The higher reduction temperature of CP‐400 may be attributed to the stronger synergistic interaction between Cr/Co and Fe. [ 45 ] The H 2 consumption of the catalysts was MM‐400 (9.19 mmol g) > CP‐400 (8.44 mmol g −1 ) > CA‐400 (8.05 mmol g) > SR‐400 (5.83 mmol g −1 ). To sum up, CP‐400 had a higher reducibility.…”

Section: Resultsmentioning

confidence: 99%

Effect of Preparation Method on the SCR Activity of Fe‐Doped CoCr Oxide Catalysts

Jin

Zhang

et al. 2023

Part & Part Syst Charact

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Fe‐doped CoCr oxide catalysts are prepared by solid‐phase mixing method, coprecipitation method, mechanical mixing method, and citric acid method, respectively, and their catalytic activity in the selective catalytic reduction of nitrogen oxides with NH3 (NH3‐SCR) is tested. The Fe0.5CoCrOx catalysts prepared by all preparation methods have good water resistance and sulfur resistance when the calcination temperature is 400 °C. Fe0.5CoCrOx prepared by coprecipitation method by calcination at 400 °C (CP‐400) is shown to have the optimum catalyst activity. In addition, the catalysts are characterized by a series of characterizations. The characterization results show that CP‐400 has the largest specific surface area, which makes the active and acidic sites highly dispersed on the surface of CP‐400, resulting in stronger redox and acidity and improved SCR activity. The removal of NO by NH3‐SCR over CP‐400 at 150 °C follows the Eley‐Rideal (ER) and Langmuir‐Hinshelwood (LH) mechanisms.

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Section: Resultsmentioning

confidence: 99%

Effect of Preparation Method on the SCR Activity of Fe‐Doped CoCr Oxide Catalysts

Jin

Zhang

et al. 2023

Part & Part Syst Charact

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“…Cr 3+ would stabilize Fe 3 O 4 from sintering and over-reduction, , while incorporation of Cu or Ni in Fe-spinel facilitates reduction of Fe 3+ due to H spillover. , Doping Zn in Ni–Fe spinel oxides expands lattice space to further improve the reducibility . Fe–Ce or Fe–Co spinel oxides offer extra redox couples (such as Ce 3+ /Ce 4+ or Co 2+ /Co 3+ ), functioning as synergic catalytic sites with Fe sites. − In recent years, new novel alkali-decorated ZnO/ZnAl 2 O 4 catalysts with outstanding activity, selectivity, resistance toward poisons, and thermal stability were developed for HT-WGS. It was demonstrated that surface medium basic sites were beneficial to activity. , In addition, MgAl 2 O 4 spinel was also proven to be an excellent support for HT-WGS because of suitable surface basicity, superior thermal stability, and attrition resistance …”

Section: Progress On Spinel Catalysts For Thermal-driven C1 Conversionmentioning

confidence: 99%

“…It was demonstrated that surface medium basic sites were beneficial to activity. 41,42 In addition, MgAl 2 O 4 spinel was also proven to be an excellent support for HT-WGS because of suitable surface basicity, superior thermal stability, and attrition resistance. 27 RWGS reaction is extremely energy-consuming and thus requires high operating temperatures.…”

Section: Introductionmentioning

confidence: 99%

Rational Design of Catalysts with Spinel Nanostructures for Thermal-Driven C1 Conversion

Han,

Guo,

Wang

et al. 2024

ACS Catal.

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“…The divalent metal M 2+ can be transition metals, post-transition metals, alkaline earth metals, or a combination of these. Thousands of pristine and doped binary and ternary spinel ferrites have been reported in the literature. − Owing to the variety of chemical compositions, phase structures, defects and morphologies, spinel ferrites demonstrate multifaceted applications in magnetic, optoelectronic devices, catalysis, sensing, environmental remediation, and biomedicine. − The history of the application of spinel ferrites dates back to the discovery of magnetite (Fe 3 O 4 ) or loadstone as a magnetic material that was used as compass for navigation centuries ago . Magnetite and similar mixed metal ferric oxides were given the name “spinel ferrites” since their crystal structure matches with that of the natural spinel MgAl 2 O 4 .…”

Section: Introductionmentioning

confidence: 99%

Wet Chemical Synthesis of Cubic Spinel Ferrites: A Review Addressing Phase Formation Behavior and Nanostructuring

Baruah,

Mukherjee,

Bhagat

et al. 2024

Crystal Growth & Design

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Spinel ferrites, an important class of complex oxides, are imperative worldwide for their well-known magnetic, electrical, optical, catalytic properties, which led tem to be useful in various applications. These can be prepared through various solid state, physical, and wet chemical methods. One difficulty associated with the preparation of complex compositions of spinel ferrite (e.g., AB 2 O 4 where A and B are two different metal cations with +2 and +3 valence states, respectively) is the fact that often individual metal oxides are obtained as impurities with the desired composition. Mostly, the spinel ferrites crystallize into cubic phase, which makes these isotropic oxides difficult to grow in 1D structures like other anisotropic oxides such as hexagonal zinc oxide and tetragonal titania. Existing reports have mostly overlooked the aforementioned challenges for the synthesis of spinel ferrites. Viewing in the same line, in the present Review, we have reviewed different wet chemical approaches for the synthesis of spinel ferrites and made an attempt to correlate the phase formation behavior, composition, and morphology with the synthesis procedure. In addition, the procedures and mechanisms for the synthesis of phase-pure 1D spinel ferrites are also described. This Review offers comprehensive insight for researchers keen on delving into the synthesis and diverse applications of cubic spinel ferrites.

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Ce/Cr and Ce/Co modified ferrite catalysts for high temperature water-gas shift reaction at elevated pressures

Cited by 10 publications

References 50 publications

Effect of Preparation Method on the SCR Activity of Fe‐Doped CoCr Oxide Catalysts

Effect of Preparation Method on the SCR Activity of Fe‐Doped CoCr Oxide Catalysts

Rational Design of Catalysts with Spinel Nanostructures for Thermal-Driven C1 Conversion

Wet Chemical Synthesis of Cubic Spinel Ferrites: A Review Addressing Phase Formation Behavior and Nanostructuring

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