The effect of H2O on the adsorption of NO2 on γ-Al2O3 an
The effect of water on the adsorption of NO2 onto a gamma-Al2O3 catalyst support surface was investigated using Fourier transform infrared spectroscopy (FTIR) and mass spectrometry (MS). Upon room temperature exposure of the alumina surface to small amounts of NO2 nitrites and nitrates are formed and at higher NO2 doses only nitrates are
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ISSN (E) 2277- 7695 ISSN (P) Alpha Beta and
adsorption because of its high surface area and good porosity parameters 3 4 . Catalyst support is the material usually a solid with high surface area to which catalyst is affixed. Typical supports include various kinds of carbon alumina and silica. The reactivity of
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Thermodynamic characterization of the hydroxyl group on
Characterization of water adsorption on the surface of γ-alumina is therefore a subject of particular concern and this for two main reasons. First of all the acido-basicity of the surface is strongly dependent on its degree of hydration. Hindin et al. 4 have studied the hydrogenation
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(PDF) Influence of the preparation procedure parameters on
Today Vol. 113 applying the EDF technique on the γ-alumina s surface 2006 pp. . using an impregnating solution with a constant pH 8 J. Xu et al. "Biogas reforming for hydrogen value equals to 7.0 constitutes a promising method for production over nickel and cobalt bimetallic catalysts" preparing very active selective and
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Facile Preparation of Mesoporous γ-Alumina Nanoparticles
Mousavi Zavvar et al. 24 also used γ-alumina obtained by solvent burning for the Zn heavy metal adsorption and reached to maximum adsorption capacity 58 mg/g. Yu et al. 25 investigated the impact of environmental conditions on the adsorption behavior of 63Ni(II) on the surface of commercial γ-alumina in their study.
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INFLUENCE OF THE SYNTHESIS CONDITIONS OF ALUMINA
Abstract The surface properties of γ-alumina can be modulated by its synthesis conditions. Since water adsorbs dissocia- tively on the surface of γ-alumina its surface state will depend also on the water partial pressure of the atmosphere.
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Surface hydrophobicity and acidity effect on alumina
Jul 17 2017 · The chlorine content in AC550 and AC350 alumina supports was 0.38 and 0.8 respectively using the oxygen flask analysis described earlier. Within the region of desorption of water at 90 °C 41 the weight loss caused by the desorption of water was 2.06 and 3.1 for a Cu loading of 6 and 15 respectively.
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The heterogeneous reaction of HNO3 on mineral dust and γ
The kinetics of the interaction of HNO 3 with natural mineral dusts (Saharan Chinese and Arizona dust) and γ-alumina surfaces has been studied at T = 298 K using a Knudsen cell reactor coupled to a mass spectrometer for kinetic studies on the gas uptake as well as DRIFT spectroscopy for studies of the surface products. The uptake of HNO 3 on each surface was found to be fast with initial
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Facile Preparation of Mesoporous γ-Alumina Nanoparticles
Mousavi Zavvar et al. 24 also used γ-alumina obtained by solvent burning for the Zn heavy metal adsorption and reached to maximum adsorption capacity 58 mg/g. Yu et al. 25 investigated the impact of environmental conditions on the adsorption behavior of 63Ni(II) on the surface of commercial γ-alumina in their study.
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Facile Preparation of Mesoporous γ-Alumina Nanoparticles
Mousavi Zavvar et al. 24 also used γ-alumina obtained by solvent burning for the Zn heavy metal adsorption and reached to maximum adsorption capacity 58 mg/g. Yu et al. 25 investigated the impact of environmental conditions on the adsorption behavior of 63Ni(II) on the surface of commercial γ-alumina in their study.
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Adsorption and dissociation of water on relaxed alumina
In summary we hope that the stoichiometric clusters of alumina here considered are reasonable mod-els to study the water addition on non-ideal realistic alumina surfaces with steps and defects. For in-stance the (Al 2 O 3) 4 clusters resembles an oxygen terminated (001) surfaces whereas (Al 2 O 3) 5 resembles a surface with a missing Al atom.
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(PDF) Surface Reactions of Chlorine With γ-Alumina
The reaction of chlorine with γ-alumina was studied in the temperature range 300–1070 K by thermogravimetry and also by pulse and volumetric adsorption methods. An exclusively surface reaction
Get PriceStudy of γ-Alumina Surface Reactivity Adsorption of Water
Study of γ-Alumina Surface Reactivity Adsorption of Water and Hydrogen Sulfide on Octahedral Aluminum Sites August 2002 The Journal of Physical Chemistry B 106(36)
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The effect of H2O on the adsorption of NO2 on γ-Al2O3 an
The effect of water on the adsorption of NO2 onto a gamma-Al2O3 catalyst support surface was investigated using Fourier transform infrared spectroscopy (FTIR) and mass spectrometry (MS). Upon room temperature exposure of the alumina surface to small amounts of NO2 nitrites and nitrates are formed and at higher NO2 doses only nitrates are
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Adsorption and dissociation of water on relaxed alumina
In summary we hope that the stoichiometric clusters of alumina here considered are reasonable mod-els to study the water addition on non-ideal realistic alumina surfaces with steps and defects. For in-stance the (Al 2 O 3) 4 clusters resembles an oxygen terminated (001) surfaces whereas (Al 2 O 3) 5 resembles a surface with a missing Al atom.
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Microwave‐heated γ‐Alumina Applied to the Reduction of
Oct 23 2020 · Taken together the results suggest that catalyst deactivation is due to the accumulation of carbon and/or water adsorption in the catalyst after the reaction blocking the active acid sites on γ‐Al 2 O 3. Thermal treatment over the catalyst was performed to remove the blocking acid sites from residues during reusability from the γ‐Al 2 O 3.
Get PriceAdsorption studies of cyanide onto activated carbon and γ
Adsorption studies of cyanide onto activated carbon and γ-alumina impregnated with cooper ions Liliana Giraldo1 Juan Carlos Moreno-Piraján2 surface area has an effect although the reactivity of the surface as a result of oxygenated functional groups e.g. L. Giraldo et al. / Natural Science 2
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Adsorption studies of cyanide onto activated carbon and γ
Adsorption studies of cyanide onto activated carbon and γ-alumina impregnated with cooper ions Liliana Giraldo1 Juan Carlos Moreno-Piraján2 surface area has an effect although the reactivity of the surface as a result of oxygenated functional groups e.g. L. Giraldo et al. / Natural Science 2
Get PriceSynthesis of γ-alumina (Al2O3) nanoparticles and their
The γ-alumina nanoparticles were synthesized via a precipitation method in water. 0.4 M AlCl 3 ·6H 2 O was dissolved in 120 mL of deionized water and 4 mL of Tween-80 was added to this solution. After 1 h a 50 aqueous solution of formamide as the precipitation agent was added dropwise to the mixture with continuous ultrasonication (150 W
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Competitive sorption of Ni and Zn at the aluminum oxide
Mar 27 2018 · Chemicals and reagents. The absorbent used in this study is gamma-phase aluminum oxides (γ-Al 2 O 3) obtained from Sigma-Aldrich.The γ-Al 2 O 3 has a strong sorption capacity for Ni and Zn 26 27 28 29 and it can also serve as an analogue to commonly found surfaces in soils and sediments such as aluminum oxides aluminum hydroxides and phyllosilicates (e.g. kaolinite illite).
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Competitive sorption of Ni and Zn at the aluminum oxide
Mar 27 2018 · Chemicals and reagents. The absorbent used in this study is gamma-phase aluminum oxides (γ-Al 2 O 3) obtained from Sigma-Aldrich.The γ-Al 2 O 3 has a strong sorption capacity for Ni and Zn 26 27 28 29 and it can also serve as an analogue to commonly found surfaces in soils and sediments such as aluminum oxides aluminum hydroxides and phyllosilicates (e.g. kaolinite illite).
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Adsorption studies of cyanide onto activated carbon and γ
Adsorption studies of cyanide onto activated carbon and γ-alumina impregnated with cooper ions Liliana Giraldo1 Juan Carlos Moreno-Piraján2 surface area has an effect although the reactivity of the surface as a result of oxygenated functional groups e.g. L. Giraldo et al. / Natural Science 2
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INFLUENCE OF THE SYNTHESIS CONDITIONS OF ALUMINA
Abstract The surface properties of γ-alumina can be modulated by its synthesis conditions. Since water adsorbs dissocia- tively on the surface of γ-alumina its surface state will depend also on the water partial pressure of the atmosphere.
Get PriceMicrowave‐heated γ‐Alumina Applied to the Reduction of
Oct 23 2020 · Taken together the results suggest that catalyst deactivation is due to the accumulation of carbon and/or water adsorption in the catalyst after the reaction blocking the active acid sites on γ‐Al 2 O 3. Thermal treatment over the catalyst was performed to remove the blocking acid sites from residues during reusability from the γ‐Al 2 O 3.
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The heterogeneous reaction of HNO3 on mineral dust and γ
The kinetics of the interaction of HNO 3 with natural mineral dusts (Saharan Chinese and Arizona dust) and γ-alumina surfaces has been studied at T = 298 K using a Knudsen cell reactor coupled to a mass spectrometer for kinetic studies on the gas uptake as well as DRIFT spectroscopy for studies of the surface products. The uptake of HNO 3 on each surface was found to be fast with initial
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Dynamics of Pb(II) adsorption on nanostructured γ-alumina
Mar 13 2015 · Considering the surface area of γ-alumina in the range of 150–500 m 2 /g and a pore radius in the range of 1.5–6 nm the form of γ-alumina is anticipated to be more active than the α-alumina.γ-Al 2 O 3 nanoparticle and as such is a promising material as an adsorbent due to its large specific surface area high adsorption capacity
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Synthesis of γ-alumina (Al2O3) nanoparticles and their
The γ-alumina nanoparticles were synthesized via a precipitation method in water. 0.4 M AlCl 3 ·6H 2 O was dissolved in 120 mL of deionized water and 4 mL of Tween-80 was added to this solution. After 1 h a 50 aqueous solution of formamide as the precipitation agent was added dropwise to the mixture with continuous ultrasonication (150 W
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Surface hydrophobicity and acidity effect on alumina
Jul 17 2017 · The chlorine content in AC550 and AC350 alumina supports was 0.38 and 0.8 respectively using the oxygen flask analysis described earlier. Within the region of desorption of water at 90 °C 41 the weight loss caused by the desorption of water was 2.06 and 3.1 for a Cu loading of 6 and 15 respectively.
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Adsorption of Organosilanes and Formation of Organo
Adsorption of vinyl triethoxysilane and γ-aminopropyltriethoxysilane on the surface of aluminiumfrom aqueous solutions was studied by quartz nanobalance technique. Adsorption isotherms were obtained. It was shown that during adsorption silanes displace adsorbed water from the surface.
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