Studies of physicochemical and surface properties of alumina modified with rare-earth oxides I. Preparation, structure and thermal stability

Wachowski, L.; Kirszensztejn, Piotr; Łopatka, R.; Czajka, B.

doi:10.1016/0254-0584(94)90067-1

Cited by 26 publications

(21 citation statements)

References 19 publications

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“…7). These observations suggest that the XPS peak at 309 eV may be due to Rh 4+ present in RhO 2 as well as "super-stoichiometric" Rh 2 O 3 (12,13,33,34). Thus, it is conceivable that the outermost layers of Rh 2 O 3 have an O/Rh ratio in excess of 1.5.…”

Section: Effects Of Aging On Rhodiummentioning

confidence: 82%

“…• C. Previous studies have shown that the transformation of γ -to α-alumina can be either accelerated or retarded by the presence of small amounts of oxide impurities (29)(30)(31)(32)(33)(34). Oxides such as Fe 2 O 3 , TiO 2 , MgO, NiO, CuO, MnO 2 , V 2 O 5 , and PtO have been found to encourage the transformation to α-alumina at temperatures as low as 900…”

Section: Effects Of Aging On Aluminamentioning

confidence: 97%

“…reported in the literature (25)(26)(27)(28)(29)(30)(31)(32)(33)(34), there may be a combination of factors controlling the transformation of γ -alumina to α-alumina, including the creation, diffusion, ordering, and annihilation of point defects and stress formation. In the γ -alumina phase, the structure is a disordered spinel with a random distribution of aluminum vacancies and a mixed occupation of both octahedral and tetrahedral sites by Al (25).…”

Section: Effects Of Aging On Aluminamentioning

confidence: 97%

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Microstructural Evolution of γ-Alumina-Supported Rh upon Aging in Air

Weng-Sieh

Gronsky

Bell

1997

Journal of Catalysis

125

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Section: Effects Of Aging On Rhodiummentioning

confidence: 82%

Section: Effects Of Aging On Aluminamentioning

confidence: 97%

Section: Effects Of Aging On Aluminamentioning

confidence: 97%

See 1 more Smart Citation

Microstructural Evolution of γ-Alumina-Supported Rh upon Aging in Air

Weng-Sieh

Gronsky

Bell

1997

Journal of Catalysis

125

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“…When mixed, the resonance that is due to MEEA-A diminishes in intensity and a new resonance is observed at ␦ ϭ 1.13 ppm. This new resonance is assigned to Al(acac) 3 , by comparison with an authentic sample. As the reaction proceeds, subsequent spectra at regular time intervals indicate further Al(acac) 3 formation, with a correspondent decrease in the resonance that is due to MEEA-A.…”

Section: Resultsmentioning

confidence: 90%

“…6(b). The yttrium-doped MEEA-A that is formed from the reaction of Y(acac) 3 and MEEA-A in a 3:6 molar ratio (sample 8) consists of aggregates of particles 100 -500 nm in size. Microprobe analysis has confirmed the Y:Al stoichiometric ratio (3:6).…”

Section: (2) Yttriummentioning

confidence: 99%

Facile Synthesis of Aluminum‐Containing Mixed‐Metal Oxides Using Doped Carboxylate Alumoxane Nanoparticles

Callender

Barron

2000

Journal of the American Ceramic Society

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A simple and rapid process has been developed that allows the formation of highly crystalline main-group, lanthanide, and transition-metal aluminates, including CaAl 12 O 19 (hibonite). Carboxylate-stabilized alumina nanoparticles (carboxylate alumoxanes) are reacted with the appropriate metal acetylacetonate complexes to form metal-doped carboxylate alumoxanes and aluminum acetylacetonate via a facile transmetalation reaction. Thermolysis of the metal-doped carboxylate alumoxanes, up to a temperature of 1400°C, yields crystalline aluminates, as confirmed by X-ray diffractometry, electron microprobe analysis, and scanning electron microscopy. The synthesis of different phases (i.e., LaAl 11 O 18 versus LaAlO 3 ) is controlled by the stoichiometry of the transmetalation reaction. A new, distorted, perovskite phase (with lattice parameters of a ‫؍‬ 5.47 Å and c ‫؍‬ 13.3 Å) of LaAlO 3 is formed. The alumoxane methodology results in multicomponent aluminate materials that are obtained in shorter processing times and with greater phase purity than previously reported. This observation is undoubtedly due to the atomic-scale mixing that is inherent in the alumoxane nanoparticle approach.

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Emphasis on the Properties of Metal‐Containing Zeolites Operating Outside the Comfort Zone of Current Heterogeneous Catalytic Reactions

et al. 2020

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The development of catalysts that can operate under exceptionally harsh and unconventional conditions is of critical importance for the transition of the energy and chemicals industries to low‐emission and renewable chemical feedstocks. In this review we will highlight materials and more specifically metal‐containing zeolite catalysts that have been tested under harsh reaction conditions such as high temperature light alkane conversion and biomass valorization. Particular attention will be given to studies that explore the stability and recyclability of metal‐containing zeolite catalysts operating in continuous modes. Metal‐containing zeolites are considered as an important class of catalysts operating outside the comfort zone of current heterogeneous catalytic reactions in both gas and liquid phase reactions. The relationship between the properties of the metal‐containing zeolite and catalytic performance will be explored.

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Studies of physicochemical and surface properties of alumina modified with rare-earth oxides I. Preparation, structure and thermal stability

Cited by 26 publications

References 19 publications

Microstructural Evolution of γ-Alumina-Supported Rh upon Aging in Air

Microstructural Evolution of γ-Alumina-Supported Rh upon Aging in Air

Facile Synthesis of Aluminum‐Containing Mixed‐Metal Oxides Using Doped Carboxylate Alumoxane Nanoparticles

Emphasis on the Properties of Metal‐Containing Zeolites Operating Outside the Comfort Zone of Current Heterogeneous Catalytic Reactions

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