Correlation between the reduction behavior of ferrospinels synthesized by a ‘soft’ chemical method and their carbon monoxide oxidation activity

Ummer, Aniz Chennampilly; Robinson, P.P.; Rashid, K.K.Abdul; Nair, T. D. Radhakrishnan

doi:10.1007/s11144-012-0472-y

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…The mean pore diameter of the samples also shifted slightly towards micro pore size in this case as shown in Figure- The TPR studies of the pure ferrite samples calcined at 300 o C were done and the results are given in Figure- ; the profiles of pure ferrites are shown magnified for easy read-out. The respective reduction peaks of metal ions present and their peak positions are well matching with the earlier data [21,24] . It is interesting that all the three simple ferrite samples got exactly similar TPR pattern in comparison with those prepared through nitrate routes.…”

Section: Ce-cufe2o4supporting

confidence: 89%

Effect of Redox Nature of Impregnated Ferrite Catalysts on Their Carbon Monoxide Oxidation Activity

Naira¹,

Aniz²

2016

Res. Rev. J Mat. Sci

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Ferrite catalysts of Nickel, Cobalt and Copper were prepared by coprecipitation hydrothermal route and were impregnated with Palladium, Cerium and Lanthanum as promoters. These were characterized and found to be thermally stable. Bothe the ferrites and the impregnated samples were tested for carbon monoxide oxidation activities and the results correlated with the reducibility of the catalysts using temperature programmed reduction (TPR) studies. The reduction step of hematite phase of ferrites to magnetite was found shifted to lower temperature region and the catalytic activity was found to be enhanced upon Pd impregnation. The reason for the improved catalytic activity is explained on the basis of preferential adsorption, the strong synergic effects between the different metal components and the relative changes in the redox nature of the catalysts.

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Section: Ce-cufe2o4supporting

confidence: 89%

Effect of Redox Nature of Impregnated Ferrite Catalysts on Their Carbon Monoxide Oxidation Activity

Naira¹,

Aniz²

2016

Res. Rev. J Mat. Sci

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“…Interestingly, H 2 -TPR predicts the hydrogen abstraction power of the catalysts, and our results explain the difference in reduction behavior of the samples under study, which are important for reforming reactions. The phenomena of reduction peak shifting of supported metal oxide systems are well discussed in the literature and due to the interactions between metal and the support materials . The primary and important step during reforming reaction is the hydrogen dissociation over metal sites to produce carbo cations. , No metal agglomeration was observed in the TEM results, though they do not represent analysis at bulk.…”

Section: Resultsmentioning

confidence: 94%

“…The phenomena of reduction peak shifting of supported metal oxide systems are well discussed in the literature and due to the interactions between metal and the support materials. 45 The primary and important step during reforming reaction is the hydrogen dissociation over metal sites to produce carbo cations. 29,27 No metal agglomeration was observed in the TEM results, though they do not represent analysis at bulk.…”

Section: Resultsmentioning

confidence: 99%

Understanding the Promotional Effect of Silver in Naphtha Reforming over a Ga/ZSM-5 Catalyst to Enhance Liquid Yield

Ummer,

Akhtar,

Alnaimi

et al. 2024

J. Phys. Chem. C

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Aromatics are one of the most highly demanded hydrocarbon raw materials for the chemical industry. In the present study, efforts are made to understand the promotional effect of silver together with gallium on ZSM-5 zeolite as a catalyst for the reforming reaction of realistic, full range commercial naphtha feed in a fixed bed reactor at atmospheric pressure and 550 °C temperature. The dual metal system showed a synergic effect to enhance the aromatic selectivity and liquid yield and decrease the off-gas formation. The catalyst samples are prepared by desilication followed by co-impregnation of silver and gallium on to ZSM-5, characterized by X-ray diffraction, N 2 adsorption, NH 3 desorption, pyridine-FTIR, temperature-programmed reduction, and analysis of morphology. It is observed from reduction studies that upon incorporation of silver and gallium, catalyst properties like proton abstraction, reducibility, Lewis and Bronsted acidities, etc. are favorably modified. These results are discussed in detail, and an attempt is made to correlate them with the catalytic reaction results obtained.

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Precursor decomposition mechanism of In2O3 powder for oxide ceramic targets

Song,

Chen,

Sun

et al. 2023

Ceramics International

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Correlation between the reduction behavior of ferrospinels synthesized by a ‘soft’ chemical method and their carbon monoxide oxidation activity

Cited by 5 publications

References 18 publications

Effect of Redox Nature of Impregnated Ferrite Catalysts on Their Carbon Monoxide Oxidation Activity

Effect of Redox Nature of Impregnated Ferrite Catalysts on Their Carbon Monoxide Oxidation Activity

Understanding the Promotional Effect of Silver in Naphtha Reforming over a Ga/ZSM-5 Catalyst to Enhance Liquid Yield

Precursor decomposition mechanism of In2O3 powder for oxide ceramic targets

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