Dynamic in situ observation of rapid size and shape change of supported Pd nanoparticles during CO/NO cycling

2007 ◽  
Vol 6 (7) ◽  
pp. 528-532 ◽  
Author(s):  
Mark A. Newton ◽  
Carolina Belver-Coldeira ◽  
Arturo Martínez-Arias ◽  
Marcos Fernández-García
Keyword(s):  
Shape Change ◽  
Pd Nanoparticles ◽  
In Situ Observation ◽  
Size And Shape ◽  
Supported Pd

In situ preparation of graphene oxide supported Pd nanoparticles in an ionic liquid and the long-term catalytic stability for the Heck reaction

2015 ◽  
Vol 3 (32) ◽  
pp. 16583-16589 ◽  
Author(s):  
Dan Liu ◽  
Changjun Zhang ◽  
Fei Wang ◽  
Zhongyuan Huang ◽  
Ningshuang Zhang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Heck Reaction ◽  
High Efficiency ◽  
Organic Cation ◽  
Pd Nanoparticles ◽  
In Situ Preparation ◽  
Catalytic Stability ◽  
Supported Pd

The double protection of the organic cation [BMIM]+ and RGO can reduce the collision and agglomeration of Pd nanoparticles. Hence, the in situ prepared Pd/RGO can exhibit high efficiency and long-term catalytic stability for the Heck reaction in the ionic liquid.

In situ oxidation study of MgO(100) supported Pd nanoparticles

2006 ◽  
Vol 600 (14) ◽  
pp. 2860-2867 ◽  
Author(s):  
N. Kasper ◽  
A. Stierle ◽  
P. Nolte ◽  
Y. Jin-Phillipp ◽  
T. Wagner ◽  
...  
Keyword(s):  
Pd Nanoparticles ◽  
In Situ Oxidation ◽  
Oxidation Study ◽  
Supported Pd

scholarly journals Time-resolved operando studies of carbon supported Pd nanoparticles under hydrogenation reactions by X-ray diffraction and absorption

2018 ◽  
Vol 208 ◽  
pp. 187-205 ◽  
Author(s):  
Aram L. Bugaev ◽  
Oleg A. Usoltsev ◽  
Andrea Lazzarini ◽  
Kirill A. Lomachenko ◽  
Alexander A. Guda ◽  
...  
Keyword(s):  
Pd Nanoparticles ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Hydrogenation Reactions ◽  
X Ray Absorption ◽  
Supported Pd ◽  
Comprehensive Study ◽  
Operando Studies

We present a comprehensive study of a 5 wt% Pd/C catalyst in various environments by using in situ and operando X-ray absorption and diffraction.

In Situ Observation of Catalyzed Gasification of Graphite by Nickel

1981 ◽  
Vol 39 ◽  
pp. 76-77
Author(s):  
R. T. K. Baker ◽  
R. D. Sherwood
Keyword(s):  
Objective Lens ◽  
In Situ Observation ◽  
Gas Flows ◽  
Catalytic Gasification ◽  
Television Camera ◽  
Viewing Screen ◽  
Fuels And Chemicals ◽  
Gasification Of Carbon ◽  
Transmission Microscope

The catalytic gasification of carbon at high temperature by microscopic size metal particles is of fundamental importance to removal of coke deposits and conversion of refractory hydrocarbons into fuels and chemicals. The reaction of metal/carbon/gas systems can be observed by controlled atmosphere electron microscopy (CAEM) in an 100 KV conventional transmission microscope. In the JEOL gas reaction stage model AGl (Fig. 1) the specimen is positioned over a hole, 200μm diameter, in a platinum heater strip, and is interposed between two apertures, 75μm diameter. The control gas flows across the specimen and exits through these apertures into the specimen chamber. The gas is further confined by two apertures, one in the condenser and one in the objective lens pole pieces, and removed by an auxiliary vacuum pump. The reaction zone is <1 mm thick and is maintained at gas pressure up to 400 Torr and temperature up to 1300<C as measured by a Pt-Pt/Rh 13% thermocouple. Reaction events are observed and recorded on videotape by using a Philips phosphor-television camera located below a hole in the center of the viewing screen. The overall resolution is greater than 2.5 nm.

In situ observation of the martensitic transformation in (Mg,Y)-PSZ

1986 ◽  
Vol 44 ◽  
pp. 500-501
Author(s):  
R-R. Lee
Keyword(s):  
Martensitic Transformation ◽  
High Strength ◽  
Nucleation And Growth ◽  
In Situ Observation ◽  
Considerable Potential ◽  
Transmission Electron ◽  
Structural Applications ◽  
Applied Stresses ◽  
Kinetics Of

Partially-stabilized ZrO2 (PSZ) ceramics have considerable potential for advanced structural applications because of their high strength and toughness. These properties derive from small tetragonal ZrO2 (t-ZrO2) precipitates in a cubic (c) ZrO2 matrix, which transform martensitically to monoclinic (m) symmetry under applied stresses. The kinetics of the martensitic transformation is believed to be nucleation controlled and the nucleation is always stress induced. In situ observation of the martensitic transformation using transmission electron microscopy provides considerable information about the nucleation and growth aspects of the transformation.

In situ TEM observations of melting in nanosized eutectic Pb-Cd inclusions embedded in Al

1996 ◽  
Vol 54 ◽  
pp. 986-987
Author(s):  
S. Hagège ◽  
U. Dahmen ◽  
E. Johnson ◽  
A. Johansen ◽  
V.S. Tuboltsev
Keyword(s):  
Electron Microscope ◽  
Melt Spinning ◽  
Ternary Alloys ◽  
Solid Matrix ◽  
Eutectic System ◽  
In Situ Tem ◽  
In Situ Observation ◽  
Orientation Relationships ◽  
Transmission Electron

Small particles of a low-melting phase embedded in a solid matrix with a higher melting point offer the possibility of studying the mechanisms of melting and solidification directly by in-situ observation in a transmission electron microscope. Previous studies of Pb, Cd and other low-melting inclusions embedded in an Al matrix have shown well-defined orientation relationships, strongly faceted shapes, and an unusual size-dependent superheating before melting.[e.g. 1,2].In the present study we have examined the shapes and thermal behavior of eutectic Pb-Cd inclusions in Al. Pb and Cd form a simple eutectic system with each other, but both elements are insoluble in solid Al. Ternary alloys of Al (Pb,Cd) were prepared from high purity elements by melt spinning or by sequential ion implantation of the two alloying additions to achieve a total alloying addition of up to lat%. TEM observations were made using a heating stage in a 200kV electron microscope equipped with a video system for recording dynamic behavior.

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