Catalytic conversion of ethanol and iso-propanol over ZnO-treated Co3O4/Al2O3 solids

Doheim, M. M.; El-Shobaky, H.G.

doi:10.1016/s0927-7757(01)01128-1

Cited by 32 publications

(12 citation statements)

References 18 publications

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“…Catalytic dehydration of ethanol into ethylene was investigated using different transition metal catalysts such as titanium oxides [1,2], magnesium oxides [3,4], cobalt oxides [5,6], chromium oxide [7], silver salt of tungstophosphoric acid [8], Fe 2 O 3 /Al 2 O 3 [9], FeO x /Al 2 O 3 (prepared using iron and aluminum oxides recovered from steel-pickling chemical waste and aluminum dross tailings, respectively) [10], Fe 2 O 3 , CoO, and NiO/clay [11], iron ion-exchanged mordenite [12], and Na 2 O-doped Mn 2 O 3 /Al 2 O 3 [13]. Also, ethanol dehydration was studied using aluminum and/or silicon oxide materials [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Catalytic dehydration of ethanol using transition metal oxide catalysts

Zaki

2005

Journal of Colloid and Interface Science

107

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Section: Introductionmentioning

confidence: 99%

Catalytic dehydration of ethanol using transition metal oxide catalysts

Zaki

2005

Journal of Colloid and Interface Science

107

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“…Review of the literature shows, however, that isopropyl alcohol conversion has been often studied using various inorganic compounds, most commonly pure and mixed oxides,50–52 as catalysts. It has been found that selectivity of the process can change in a wide range depending on the catalyst composition 51.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of polypyrrole with dispersed metallic rhodium particles

Stochmal

Hasik

Turek

et al. 2011

Polymers for Advanced Techs

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Polypyrrole (PPy) with dispersed metallic Rh particles has been prepared by all‐chemical route, i.e. reduction of Rh3+ ions existing in RhCl3 aqueous solutions with sodium borohydride (NaBH4) carried out in the presence of the previously obtained PPy doped with chloride ions (PPyCl). PPy–Rh composites thus formed have been characterized using X‐ray diffraction (XRD), scanning and transmission electron microscopies (SEM, TEM) combined with energy dispersive X‐ray (EDX) microanalysis, Rh3d X‐ray photoelectron (XPS), and IR spectroscopies. This has made it possible to find out that metallic Rh nanoparticles, mainly of sizes below 10 nm, have been present in the composites. Agglomerates, with sizes up to 0.7 µm, have been formed in the systems containing higher amounts of Rh. PPy serving as the matrix in the composites has been doped. However, its doping level has been lower than that of the starting PPyCl. This has been explained by partial reduction of the polymer occurring during preparation of the composites. Catalytic properties of the PPy–Rh systems have been investigated using isopropyl alcohol conversion as a test reaction. It has been established that the composites are active redox catalysts. This makes them promising materials for applications as catalysts of various redox processes. Copyright © 2010 John Wiley & Sons, Ltd.

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“…Mixed oxide catalysts are more active in dehydrating alcohols than single oxide catalysts. The chemical composition, calcination temperature of mixed oxides, and doping with foreign ion are among the factors affecting the performance of the catalyst towards the conversion of alcohols [25,27,29,30,[34][35][36][37][38][39][40]. Treatment of 0.1Mn 2 O 3 /Al 2 O 3 with Na 2 O (3 or 6 mol%) followed by heating at 500˚C led to the formation of (Na 0.2 MnO 2 ), with subsequent decrease in the BET surface area and an effective increase in the catalytic activity towards conversion of ethanol and iso-propanol [30].…”

Section: Doping Mn Oxides Withmentioning

confidence: 99%

Effects of ZnO and MoO3 Doping on Surface and Catalytic Properties of Manganese Oxide Supported on Alumina System

Ibrahim¹,

El-Shobaky²,

Mohamed³

et al. 2010

TOCATJ

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0.2Mn 2 O 3 /Al 2 O 3 system was prepared by the impregnation method using finely powdered Al(OH) 3 and a calculated amount of Mn(NO 3) 2 dissolved in the smallest amount of distilled water followed by drying and calcination at 400-600°C. Six doped solids were prepared by impregnating powdered Al(OH) 3 Solids with different amounts of Zn(NO 3) 2 or (NH 4) 6 Mo 7 O 24 .4H 2 O followed by drying, then impregnating with Mn(NO 3) 2. The doped solids were calcined at 400-600°C. The dopant concentrations were 0.75, 1.5, and 3 mol% ZnO or MoO 3. The structural characteristics, surface and the catalytic properties of pure and variously doped solids were examined by using XRD, N 2 adsorption at-196°C and isopropanol conversion carried out at 140-280°C using a flow technique under atmospheric pressure. The obtained results revealed that the pure solids investigated and those doped with 0.75 and 1.5mol% ZnO or MoO 3 calcined at 500°C, consisted of a mixture of nanosized MnO 2 (Pyrolusite) and Mn 2 O 3 (Partridgeite phase) together with-Al 2 O 3. Increasing the calcination temperature of the variously doped solids to 600°C led to the complete conversion MnO 2 (Pyrolusite) to nanosized Mn 2 O 3 (Partridgeite phase). The crystallite size of manganese oxide phases varied between 3 and 56 nm. All surface characteristics of the system investigated were much affected by calcination temperature and dopant concentration. Isopropanol conversion carried out over pure and doped system calcined at different temperatures proceeded via dehydration and dehydrogenation yielding propene and acetone, respectively. The activity and selectivity of the various solids were much affected by the reaction temperature, calcination temperature and dopant concentration.

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Catalytic conversion of ethanol and iso-propanol over ZnO-treated Co3O4/Al2O3 solids

Cited by 32 publications

References 18 publications

Catalytic dehydration of ethanol using transition metal oxide catalysts

Catalytic dehydration of ethanol using transition metal oxide catalysts

Preparation and characterization of polypyrrole with dispersed metallic rhodium particles

Effects of ZnO and MoO3 Doping on Surface and Catalytic Properties of Manganese Oxide Supported on Alumina System

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