The Thermal Decomposition of Aluminum Sulfate and Hafnium Sulfate

Papazian, Harold A.; Pizzolato, P. J.; Orrell, R.R.

doi:10.1016/s0040-6031(72)80023-6

Cited by 15 publications

(7 citation statements)

References 6 publications

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“…The powder produced was dried at 150 °C and calcined at 800 °C to obtain γ-alumina, then finally transformed to α-Al 2 O 3 at 1200 °C. The following equation shows the recrystallization reactions [6,13]:…”

Section: Methodsmentioning

confidence: 99%

Synthesis of nano-alumina powder via recrystallization of ammonium alum

Saud¹,

Majdi²,

Saud

2019

Cerâmica

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In the present study, a recrystallization method was implemented to recover alumina powder from ammonium alum crystal. The ammonium alum was completely dissolved in water and treated by ultra-sonication to prevent the agglomeration of the alum crystal. The white precipitate was dried at 150 °C for 6 h, and calcinations at different temperatures were performed for 2 h. The XRD results indicated the crystalline structure of alumina with two main phases: γ-Al2O3 and α-Al2O3 at 800 and 1200 °C, respectively. The N2 adsorption/desorption isotherm results indicated that the surface area for the powder in the γ phase, which can be applied in catalysts, was 142.5 m2/g, while, in the α-phase, it was 15.3 m2/g. The morphologies elucidated that the powder particles were widely distributed in the range of ≤160 nm at different calcination temperatures and this may be attributed to increments in the particle agglomeration as the calcination temperature increased.

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Section: Methodsmentioning

confidence: 99%

Synthesis of nano-alumina powder via recrystallization of ammonium alum

Saud¹,

Majdi²,

Saud

2019

Cerâmica

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“…A total of 39 basic and 3 acidic aluminum sulfates, as well as 13 different hydrates of the neutral salt, are described in the literature [7]. The existence of aluminum sulfates with 14,13,12,9,7,4,2, and 1 mol of water can be concluded from the vapor-pressure curves and the dehydration curves of the Al 2 (SO 4 ) 3 -H 2 O and Al 2 (SO 4 ) 3 -Al(OH) 3 -H 2 O systems [8,9].…”

Section: Propertiesmentioning

confidence: 99%

“…The desired Al 2 O 3 content is adjusted within certain limits by heating. At a temperature above 340 C, anhydrous aluminum sulfate [10043-01-3] is formed, a white powder, r 2.71 g/cm 3 , that decomposes above 770 C to aluminum oxide [9].…”

Section: Propertiesmentioning

confidence: 99%

Aluminum Compounds, Inorganic

Helmboldt¹,

Hudson²,

Misra³

et al. 2007

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Aluminum Sulfate and Alums 1.1. Aluminum Sulfate 1.1.1. Properties 1.1.2. Production 1.1.3. Uses 1.2. Alums 1.2.1. Potassium Aluminum Sulfate 1.2.2. Ammonium Aluminum Sulfate 1.2.3. Sodium Aluminum Sulfate 2. Aluminates 2.1. Sodium Aluminate 2.2. Barium Aluminates 3. Aluminum Alkoxides 4. Aluminum Chloride 4.1. Anhydrous Aluminum Chloride 4.1.1. Properties 4.1.2. Production 4.1.3. Quality Specifications and Analysis 4.1.4. Handling, Storage, and Transportation 4.1.5. Uses 4.2. Aluminum Chloride Hexahydrate 4.3. Basic Aluminum Chlorides 5. Toxicology

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“…Another alternative to successfully do that is the use of catalysts that can act through product selectivity. Knittel et al 38 As kinetic data may have an important role in understanding the chemical process, several authors have performed experimental studies on the thermal decomposition of metal sulfates [39][40][41][42] . The thermal decomposition of anhydrous magnesium sulfate was carried out by Brownell 43 at temperatures between 890 and 972 °C applying thermogravimetric analysis with an air atmosphere, reporting apparent activation energy of 343.1 kJ.mol -1 .…”

Section: Introductionmentioning

confidence: 99%

Effect of an Alumina Supported Palladium Catalyst on the Magnesium Sulfate Decomposition Kinetics

et al. 2020

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The sulfur related thermochemical water-splitting cycles are an important class of chemical processes considered for hydrogen production. Recently, the magnesium sulfate thermal decomposition has been reported as a potential unit operation in one of these cycles. Therefore, some interest has been observed in the use of catalysts to lower the activation energy of such reactions. In this context, the present manuscript reports the thermodynamics and kinetics modeling results associated with this reaction system in the presence of a Pd catalyst supported over γ-Al 2 O 3 . The presence of such species is responsible for shifting the decomposition temperature to lower values in at least 100 °C. It was observed that the magnesium content is still oriented towards MgO formation. The obtained results indicate that the Pd/Al 2 O 3 catalyst could be a good alternative in reducing the thermal decomposition temperature as its presence was responsible for diminishing the process activation energy from 368.2 to 258.8 kJ.mol −1 .

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The Thermal Decomposition of Aluminum Sulfate and Hafnium Sulfate

Cited by 15 publications

References 6 publications

Synthesis of nano-alumina powder via recrystallization of ammonium alum

Synthesis of nano-alumina powder via recrystallization of ammonium alum

Aluminum Compounds, Inorganic

Effect of an Alumina Supported Palladium Catalyst on the Magnesium Sulfate Decomposition Kinetics

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