On-Particle EDS Analysis of Bimetallic, Carbon-Supported Catalysts

1999 ◽  
Vol 589 ◽  
Author(s):  
Deborah L. Boxall ◽  
Edward A. Kenik ◽  
Charles M. Lukehart
Keyword(s):  
Elemental Analysis ◽  
Energy Dispersive Spectroscopy ◽  
High Spatial Resolution ◽  
Supported Catalysts ◽  
Alloy Nanoparticles ◽  
Single Source ◽  
Volatile Species ◽  
Molecular Precursors ◽  
Eds Analysis ◽  
Compositional Variability

AbstractThermolysis of single-source molecular precursors has been used to prepare carbon-supported Pt1Sn1, Pt1Ru1, and Pt3Mo1 alloy nanoparticles. On-particle, high spatial resolution energy dispersive spectroscopy (HR-EDS) has been used to determine the extent of compositional variability between particles in the nanocomposite. The loss of volatile Ru and Mo oxides during the course of the HR-EDS analysis results in average compositions greatly enriched in Pt. Mathematical correction for loss of these volatile species results in average metal:metal ratios comparable to those measured by bulk elemental analysis.

Identifying groups of airborne particles by ordination

1994 ◽  
Vol 52 ◽  
pp. 856-857
Author(s):  
M. Shlepr ◽  
C. M. Vicroy
Keyword(s):  
Elemental Analysis ◽  
Energy Dispersive Spectroscopy ◽  
Manufacturing Process ◽  
Spatial Representation ◽  
Airborne Particles ◽  
Common Source ◽  
Data Set ◽  
Microelectronics Industry ◽  
Induced Changes ◽  
Source Materials

The microelectronics industry is heavily tasked with minimizing contaminates at all steps of the manufacturing process. Particles are generated by physical and/or chemical fragmentation from a mothersource. The tools and macrovolumes of chemicals used for processing, the environment surrounding the process, and the circuits themselves are all potential particle sources. A first step in eliminating these contaminants is to identify their source. Elemental analysis of the particles often proves useful toward this goal, and energy dispersive spectroscopy (EDS) is a commonly used technique. However, the large variety of source materials and process induced changes in the particles often make it difficult to discern if the particles are from a common source.Ordination is commonly used in ecology to understand community relationships. This technique usespair-wise measures of similarity. Separation of the data set is based on discrimination functions. Theend product is a spatial representation of the data with the distance between points equaling the degree of dissimilarity.

Thorium amidates function as single-source molecular precursors for thorium dioxide

2021 ◽  
Author(s):  
Mark D. Straub ◽  
Erik T. Ouellette ◽  
Michael A. Boreen ◽  
Jacob A. Branson ◽  
Alex Ditter ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Single Source ◽  
Thorium Dioxide ◽  
Molecular Precursors

Volatile thorium amidates can be converted to ThO2 in the absence of an external oxygen source, and the thermal properties of these precursors can be readily tuned by modifying the ligand substituents.

Facile Access to Amides from Oxygenated or Unsaturated Organic Compounds by Metal Oxide Nanocatalysts Derived from Single-Source Molecular Precursors

2017 ◽  
Vol 56 (17) ◽  
pp. 10596-10608 ◽  
Author(s):  
Akbar Mohammad ◽  
Prakash Chandra ◽  
Topi Ghosh ◽  
Mauro Carraro ◽  
Shaikh M. Mobin
Keyword(s):  
Metal Oxide ◽  
Organic Compounds ◽  
Single Source ◽  
Molecular Precursors

Selective Degradation of Chemical Bonds:  from Single-Source Molecular Precursors to Metallic Ag and Semiconducting Ag2S Nanocrystals via Instant Thermal Activation

Langmuir ◽  
2006 ◽  
Vol 22 (6) ◽  
pp. 2802-2805 ◽  
Author(s):  
Qun Tang ◽  
Seok Min Yoon ◽  
Hyun Jin Yang ◽  
Yoonmi Lee ◽  
Hyun Jae Song ◽  
...  
Keyword(s):  
Thermal Activation ◽  
Chemical Bonds ◽  
Single Source ◽  
Molecular Precursors ◽  
Selective Degradation

Boron nitride ceramics from molecular precursors: synthesis, properties and applications

2016 ◽  
Vol 45 (3) ◽  
pp. 861-873 ◽  
Author(s):  
Samuel Bernard ◽  
Chrystelle Salameh ◽  
Philippe Miele
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Single Source ◽  
Single Source Precursors ◽  
Molecular Precursors ◽  
Nitride Ceramics ◽  
Synthesis Properties

Hexagonal boron nitride (h-BN) attracts considerable interest particularly when it is prepared from borazine-based single-source precursors through chemical routes suitable for the shaping and the nanostructuration of the final ceramic.

Selective Hydrogenation of Crotonaldehyde Over Cobalt Based Self-Supported Catalysts

1994 ◽  
Vol 368 ◽  
Author(s):  
A. N. Patil ◽  
M. A. Bañares ◽  
X. Lei ◽  
T. P. Fehlner ◽  
E. E. Wolf
Keyword(s):  
Gas Phase ◽  
Supported Catalysts ◽  
Catalyst Activity ◽  
Maximum Yield ◽  
Metal Core ◽  
Molecular Precursors ◽  
Crotyl Alcohol ◽  
Carboxylate Groups ◽  
Heterogenous Catalyst ◽  
Metal Layers

ABSTRACTComplex cobalt-carbonyl ligand based clusters of clusters are used as molecular precursors for self-supported model catalysts. These precursors consist of two metal layers: an outer of the complex Co-carbonyl ligands, and a core of metal (e.g. Co or Zn) carboxylate groups. Partial thermolysis at low temperature (LT) of these materials under hydrogen results in almost completely decarbonylated material with a mainly unchanged carboxylate metal core. Complete pyrolysis at higher temperatures (HT) in hydrogen leads to mixed metal environment. These materials were used as a heterogenous catalyst in the gas phase hydrogenation of crotonaldehyde. The maximum yield of 27 % of desired product crotyl alcohol was observed when HT-CoCo was used as the catalyst at 423 K. The catalyst activity and the crotyl alcohol selectivity remained unchanged over 2 days of operation. The bimetallic ZnCo catalysts showed lower selectivity to crotyl alcohol than the CoCo catalysts.

scholarly journals Synthesis of nanostructured powders and thin films of iron sulfide from molecular precursors

RSC Advances ◽  
2018 ◽  
Vol 8 (51) ◽  
pp. 29096-29103 ◽  
Author(s):  
Laila Almanqur ◽  
Inigo Vitorica-yrezabal ◽  
George Whitehead ◽  
David J. Lewis ◽  
Paul O'Brien
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Spin Coating ◽  
Iron Sulfide ◽  
Single Source ◽  
Single Source Precursors ◽  
Molecular Precursors ◽  
Nanostructured Powders

Iron(iii) xanthate single-source precursors were used to deposit iron sulfide thin films and nanostructures by spin coating and solid state deposition.

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