Aluminum Oxide Catalysts and Supports Obtained by Thermal Activation

The paper considers the main methods used to obtain aluminum oxides; the advantages of using hydrargillite thermal activation products for the synthesis of catalysts, supports and sorbents; the factors affecting the properties of thermal activation products and aluminum oxides obtained by thermal activation; and examples of the efficient application of hydrargillite centrifugal thermal activation products in the synthesis of catalysts, supports and sorbents.

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ChemInform Abstract: METAL CATALYSTS. 30. PREPARATION OF PLATINUM-RHENIUM/ALUMINUM OXIDE AND PLATINUM-IRIDIUM/ALUMINUM OXIDE CATALYSTS

Chemischer Informationsdienst ◽

10.1002/chin.198410033 ◽

1984 ◽

Vol 15 (10) ◽

Author(s):

S. ENGELS ◽

W. HAGER ◽

H.-J. KLUGE ◽

M. MUENCH ◽

D. SAGER ◽

...

Keyword(s):

Aluminum Oxide ◽

Metal Catalysts ◽

Oxide Catalysts

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Effect of co-existing copper and calcium on the removal of As(V) by reused aluminum oxides

Water Science & Technology ◽

10.2166/wst.2012.500 ◽

2013 ◽

Vol 67 (1) ◽

pp. 187-192

Author(s):

J. K. Yang ◽

Y. J. Park ◽

K. H. Kim ◽

H. Y. Lee ◽

K. C. Min ◽

...

Keyword(s):

Heavy Metals ◽

Binary System ◽

Aluminum Oxide ◽

Aqueous Solutions ◽

Copper Concentration ◽

Calcium Concentration ◽

Environmental Fate ◽

Mine Drainage ◽

Aluminum Oxides ◽

Molar Ratios

Among the various heavy metals, arsenic is frequently found in abandoned mine drainage and the environmental fate of arsenic in real aqueous solutions can be highly dependent on the presence of co-existing ions. In this study, removal of arsenate through adsorption on the reused aluminum oxide or through precipitation was investigated in a single and in a binary system as a function of pH and concentration. Different removal behaviors of arsenate were observed in the presence of different cations as well as a variation of the molar ratios of arsenate to cations. Co-operative effects on arsenate removal by precipitation in solution occurred with an increase of copper concentration, while a decrease of arsenate removal resulted in increasing calcium concentration. It was observed that the arsenate removal in the presence of calcium would be highly dependent on the molar ratios of both elements.

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MODIFIED COBALT CATALYSTS FOR HYDROGENATION OF HYDROCARBONS

ГОРЕНИЕ И ПЛАЗМОХИМИЯ ◽

10.18321/cpc364 ◽

2020 ◽

Vol 18 (3) ◽

pp. 156-161

Author(s):

A.N. Aitugan ◽

S.K. Tanirbergenova ◽

Ye. Tileuberdi ◽

D. Tugelbayeva

Keyword(s):

Catalytic Activity ◽

Aluminum Oxide ◽

Process Parameters ◽

Cobalt Catalyst ◽

Cobalt Catalysts ◽

Oxide Content ◽

Acetylene Hydrogenation ◽

Aluminum Oxides ◽

Selective Hydrogenation Of Acetylene ◽

Chemical Contents

This work is devoted to the study of the influence of aluminum oxide content on the activity of cobalt catalysts in the reaction of selective hydrogenation of acetylene to ethylene. Cobalt catalysts modified with aluminum oxide having size between 50 to 500 nm were synthesized. Chemical contents and structure of carrier were investigated. The catalytic activity of 5 % Со /clay and 5% Co/SiAl catalysts at acetylene hydrogenation was studied in the temperature range 100-180 , with a ratio of 1:2 of acetylene and hydrogen. The ethylene yield is 87.8 % in modifying the cobalt catalyst with aluminum oxide, whereas with the same process parameters, the ethylene yield is 72 %. 5 % Cobalt catalysts modified with 1.5 % aluminum oxides are more active in hydrogenation acetylene process than 5 % Со /clay 450 ℃ catalyst.

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Evolution of Microstructure during the Thermal Activation of Chromium-Promoted Tin(IV) Oxide Catalysts: An FT-IR, FT-Raman, XRD, TEM, and XANES/EXAFS Study

Chemistry of Materials ◽

10.1021/cm980347p ◽

1999 ◽

Vol 11 (4) ◽

pp. 896-909 ◽

Cited By ~ 21

Author(s):

Philip G. Harrison ◽

Nicholas C. Lloyd ◽

Wayne Daniell ◽

Craig Bailey ◽

Wan Azelee

Keyword(s):

Thermal Activation ◽

Oxide Catalysts ◽

Ft Ir ◽

Exafs Study ◽

Evolution Of Microstructure ◽

Ft Raman

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Boron adsorption in soils from the State of São Paulo, Brazil

Pesquisa Agropecuária Brasileira ◽

10.1590/s0100-204x2000000200020 ◽

2000 ◽

Vol 35 (2) ◽

pp. 413-421 ◽

Cited By ~ 15

Author(s):

LUÍS REYNALDO FERRACCIÚ ALLEONI ◽

OTÁVIO ANTONIO DE CAMARGO

Keyword(s):

Aluminum Oxide ◽

Correlation Coefficients ◽

Clay Content ◽

Sao Paulo ◽

The State ◽

São Paulo ◽

Aluminum Oxides ◽

Freundlich Isotherms ◽

Physical Attributes ◽

Boron Adsorption

Boron adsorption was studied in five representative soils (Rhodic Hapludox, Arenic Paleudalf and three Typic Hapludox) from the State of São Paulo, Brazil. Adsorption was higher in the clayey Oxisols, followed by the Alfisol and the coarser Oxisols. Calcium carbonate promoted an increase in the amount of adsorbed boron in all soils, with the most pronounced effect in the coarser-textured Oxisols. High correlation coefficients were found between adsorbed boron and clay and amorphous aluminum oxide contents and specific surface area (r = 0.79, 0.76 and 0.73, respectively, p < 0.01). Clay content, free aluminum oxide, and hot CaCl2 (0.01 mol L-1)-extracted boron explained 93% of the variation of adsorbed boron. Langmuir and Freundlich isotherms fitted well to the adsorbed data, and highest values for maximum boron adsorption were found in clayey soils, which were significantly correlated with contents of total, free and amorphous iron and aluminum oxides, as well with the physical attributes. Ninety four percent of the variation in the maximum adsorption could be related to the free iron content.

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ChemInform Abstract: THE MECHANISM OF DEHYDROGENATION OF CYCLOHEXANE ON MOLYBDENUM(VI) OXIDE/ALUMINUM OXIDE CATALYSTS

Chemischer Informationsdienst ◽

10.1002/chin.198008119 ◽

1980 ◽

Vol 11 (8) ◽

Author(s):

R. MAGGIORE ◽

N. GIORDANO ◽

C. CRISAFULLI ◽

F. CASTELLI ◽

L. SOLARINO ◽

...

Keyword(s):

Aluminum Oxide ◽

Oxide Catalysts ◽

Dehydrogenation Of Cyclohexane

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Mechanisms of particle movement in porous media

Clay Minerals ◽

10.1180/claymin.1986.021.4.18 ◽

1986 ◽

Vol 21 (4) ◽

pp. 753-767 ◽

Cited By ~ 3

Author(s):

J. R. Gronow

Keyword(s):

Pollution Control ◽

Migration Pattern ◽

Particle Migration ◽

Filtration Theory ◽

Particle Movement ◽

Factors Affecting ◽

Activation Products ◽

Groundwater Systems ◽

Main Factors ◽

General Filtration

AbstractActivation products of neutron-irradiated chrysotile and crocidolite which have suitable half-lives have been used as tracers to investigate the attenuation of fibres in media likely to be encountered in groundwater systems. The saturated and unsaturated filtration of chrysotile and crocidolite through columns of beads, gravel and sands is compared. The migration pattern of crocidolite through columns of disturbed and relatively undisturbed Greensand is then compared with the filtration through washed and sieved sand of the same porosity. The main factors affecting the filtration of particles are outlined, and the experimental results obtained are correlated with models used to describe general filtration theory. This is shown to provide a basis from which pollution control models may be derived and indicates that the principles underlying particle filtration will apply to particle migration in any fluid-filled system.

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