Combined effect of the redox and acid-base properties of catalysts in redox conversions of nitrogen oxides and methane

Орлик, С. Н.

doi:10.1134/s0023158408040137

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…The reason for this dissimilarity is attributed to different relations of the two catalyst’s surface properties: the presence of Lewis acid centers and the susceptibility to reduction. The synergy effect deepens this difference, as in other cases where dynamic changes in collective properties of the catalyst surface are the result of cooperation between these two types of surface sites. − Therefore, the authors deemed it advisible to investigate whether these differences are reflected, and how, in the alkylation of hydroxyarenes with primary alcohols. For this purpose, as the test reaction, methylation of phenol was performed using the Mg–Zn and Mn–Zn ferrites as catalysts.…”

Section: Introductionmentioning

confidence: 99%

Mg–Zn and Mn–Zn Ferrites Derived from Coil Core Materials as New Phenol Methylation Catalysts

Klimkiewicz

Grabowska

Miśta

et al. 2012

Ind. Eng. Chem. Res.

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A catalytic phenol methylation study on two ferrospinel materials (Mg 0.63 Zn 0.37 )(Mn 0.1 Fe 1.8 )O 3.85 (hereafter Mg− Zn) and (Mn 0.55 Zn 0.35 Fe 0.1 )Fe 2 O 4 (hereafter Mn−Zn) was performed. The reaction was carried out in the gas phase in a continuous manner with the feed composition of phenol, methanol, and water in molar ratio 1:5:1. Both ferrites are active in the studied reaction. The alkylation of phenol with methanol led to the selective production of o-methylated phenol derivatives, i.e., o-cresol and 2,6-xylenol. However, both catalysts markedly differ in terms of activity. Different synergy effects on both catalysts cannot be a sufficient explanation. These materials do not differ significantly either in their susceptibility to reduction or in their Lewis type acidity. Because their microstructure differs significantly, a size effect may therefore be responsible for the differences in activity.

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