Recent Advances on TiO2—ZrO2 Mixed Oxides as Catalysts and Catalyst Supports

ChemInform ◽  
2005 ◽  
Vol 36 (40) ◽  
Author(s):  
Benjaram Reddy ◽  
Ataullah Khan
Keyword(s):  
Mixed Oxides ◽  
Catalyst Supports ◽  
Recent Advances

Effect of solvo-thermal treatment temperature on the properties of sol–gel ZrO2–TiO2 mixed oxides as HDS catalyst supports

2006 ◽  
Vol 116 (4) ◽  
pp. 498-504 ◽  
Author(s):  
María C. Barrera ◽  
José Escobar ◽  
José A. de los Reyes ◽  
María A. Cortés ◽  
Margarita Viniegra ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Mixed Oxides ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Catalyst Supports ◽  
Thermal Treatment Temperature

scholarly journals Porous heterostructured clays - recent advances and challenges - revisão

Cerâmica ◽  
2013 ◽  
Vol 59 (352) ◽  
pp. 576-587 ◽  
Author(s):  
A. J. Schwanke ◽  
S. B. C. Pergher
Keyword(s):  
Catalyst Supports ◽  
Historical Aspects ◽  
Characterization Techniques ◽  
Recent Advances ◽  
Adsorptive Properties

Porous heterostructured clays - PCHs - are lamellar solids with acid and adsorptive properties serving as catalysts or catalyst supports formed on a template mechanism. This work provides information about porous heterostructured clays. Historical aspects of the development of lamellar solids to porous heterostructured clays will be discussed, and detailed information on synthesis and applicationaspects, as well as on the influence of eachreagent on these materials and the characterization techniques used to prove their formation will be given.

Recent Advances on TiO2‐ZrO2Mixed Oxides as Catalysts and Catalyst Supports

2005 ◽  
Vol 47 (2) ◽  
pp. 257-296 ◽  
Author(s):  
Benjaram M. Reddy ◽  
Ataullah Khan
Keyword(s):  
Catalyst Supports ◽  
Recent Advances

Recent Advances in High Dispersion Spectroscopy of Globular Cluster Stars

1988 ◽  
Vol 132 ◽  
pp. 525-530
Author(s):  
Raffaele G. Gratton
Keyword(s):  
Globular Cluster ◽  
Globular Clusters ◽  
High Dispersion ◽  
Photographic Material ◽  
Recent Advances ◽  
Metal Abundances ◽  
Ccd Detectors ◽  
Major Progress

The use CCD detectors has allowed a major progress in abundance derivations for globular cluster stars in the last years. Abundances deduced from high dispersion spectra now correlates well with other abundance indicators. I discuss some problems concerning the derivation of accurate metal abundances for globular clusters using high dispersion spectra from both the old photographic and the most recent CCD data. The discrepant low abundances found by Cohen (1980), from photographic material for M71 giants, are found to be due to the use of too high microturbulences.

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

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