ChemInform Abstract: Ru4+ Ion in CeO2 (Ce0.95Ru0.05O2‐δ): A Non‐Deactivating, Non‐Platinum Catalyst for Water Gas Shift Reaction.

Singh, Preetam; Mahadevaiah, N.; Parida, Sanjit Kumar; Hegde, M. S.

doi:10.1002/chin.201151010

Cited by 2 publications

(4 citation statements)

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“…Another feature is a reduction in cell parameter by 0.01 Å in CeCo 26y from CeCo 26 which suggests the inclusion of a smaller radius dopant (Co ion) in a large radius matrix (CeO 2 ) as reported in literature [28]. These traits favour improved redox activity in the ceria matrix due to the inclusion of Co dopant into the matrix [28–31] which is brought out by possible annealing from the increased exothermicity of HAN ternary system. The similarity of CeCo 26y with CeCo 26 annealed at 1400 °C in the air (thermal poisoning studies [19]), is indicative of the high temperature generated in the ternary system.…”

Section: Resultsmentioning

confidence: 73%

“…This is the primary influence of cobalt dopant on Ce oxidation state. The presence of even minute amounts of Ce 3 + ensures improved reducibility of ceria via oxygen vacancies generation leading to increased redox capabilities of doped ceria [28,29,31,36,37]. In HAN ternary system decomposition, the presence of Ce 3 + in CeCo 26y is visible from Figure 5b which is quite reassuring of sustained catalytic activity in spite of high-temperature conditions posed by HAN ternary system decomposition as demonstrated in XRD patterns.…”

Section: Samplesmentioning

confidence: 85%

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Impact of HAN Ternary Propellant System Decomposition on Catalytic Sustainability

Agnihotri

Oommen

2021

Propellants Explo Pyrotec

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Aqueous solution of Hydroxylammonium nitrate (HAN) in combination with a suitable fuel has been explored as a promising high performing green monopropellant in recent times. The current study primarily explores the effect of the addition of a fuel component into HAN solution on the sustainability of a recently developed catalyst which was examined for the only binary system consisting of HAN and water. The HAN ternary system examined was HAN: methanol: water in 70 : 15 : 15 (w/w) composition. The endurance of an ‘iridium over alumina’ catalyst and an indigenously developed cobalt doped ceria‐based catalyst was analysed using a batch reactor wherein a pressure rise during decomposition of propellant whilst a pulse mode operation was monitored. Catalysts were also characterized via SEM/EDS, XRD, and XPS to identify changes over the period of sequential injection in the batch reactor. Doped ceria catalyst was found to be far robust and resistant to any poisoning when compared to iridium catalyst at run time of the operation involving nearly 45 sequential injections of propellant over the catalyst.

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Section: Resultsmentioning

confidence: 73%

Section: Samplesmentioning

confidence: 85%

Impact of HAN Ternary Propellant System Decomposition on Catalytic Sustainability

Agnihotri

Oommen

2021

Propellants Explo Pyrotec

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“…The doping of cerium oxide with other metal provides the synergistic effect that is well famous in the territory of catalysis. The proficiency of cerium is to form non-stoichiometric matrix with dopants and it is also able to alter the reaction routes [12][13][14][15][16]. In addition, the cerium changes between Ce 4+ and Ce 3+ with ease.…”

Section: Introductionmentioning

confidence: 99%

“…Since ceria can become non-stoichiometric in the presence of dopants in its matrix and alter reaction routes [12][13][14][15][16]. The doping is crucial technique to enhance the proficiency of cerium as a catalyst.…”

Section: Introductionmentioning

confidence: 99%

Investigation the catalytic profile of Eu and Pr doped CeO2 nanoparticles for the thermal behavior of AP

Vara

Dave

2019

SN Appl. Sci.

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In these studies we report the catalytic proficiency of two Eu and Pr doped CeO 2 nanoparticles on the thermal behaviour of powder AP and CSPs samples. A co-precipitation method was used for synthesizing Eu and Pr doped CeO 2 nanoparticles and they were characterized by XRD, FTIR, and SEM with EDX. The catalytic proficiency of both Eu and Pr doped CeO 2 nanoparticles were investigated by utilizing TG-DSC technique. The FWO, KAS, and Starink methods were used to determine activation energies of all catalyzed AP and CSPs samples. The catalytic proficiency increased by addition of Eu and Pr doped CeO 2 nanoparticles and decomposition temperature decreased in the presence of catalyst. The activation energy decreased by the addition of Eu and Pr doped CeO 2 nanoparticles in AP and CSPs, the burning rate of CSPs found to increase by the addition of Eu and Pr doped CeO 2 nanoparticles. The Pr doped CeO 2 nanoparticles showed good catalytic efficiency on AP and CSPs that reduced the decomposition temperature around 70 °C for AP and 20 °C for CSPs. The activation energy of CSPs catalyzed by Pr doped CeO 2 nanoparticles reported 150.12, 147.60, and 146.83 kJ mol −1 by FWO, KAS, and Starink method respectively which decreases in existence of catalyst in CSPs.

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ChemInform Abstract: Ru⁴⁺ Ion in CeO₂ (Ce_0.95Ru_0.05O_2‐δ): A Non‐Deactivating, Non‐Platinum Catalyst for Water Gas Shift Reaction.

Cited by 2 publications

References 1 publication

Impact of HAN Ternary Propellant System Decomposition on Catalytic Sustainability

Impact of HAN Ternary Propellant System Decomposition on Catalytic Sustainability

Investigation the catalytic profile of Eu and Pr doped CeO2 nanoparticles for the thermal behavior of AP

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