scholarly journals Coke Formation in a Zeolite Crystal During the Methanol‐to‐Hydrocarbons Reaction as Studied with Atom Probe Tomography

2016 ◽  
Vol 55 (37) ◽  
pp. 11173-11177 ◽  
Author(s):  
Joel E. Schmidt ◽  
Jonathan D. Poplawsky ◽  
Baishakhi Mazumder ◽  
Özgün Attila ◽  
Donglong Fu ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Coke Formation ◽  
Atom Probe ◽  
Zeolite Crystal ◽  
Methanol To Hydrocarbons

scholarly journals Coke Formation in a Zeolite Crystal During the Methanol-to-Hydrocarbons Reaction as Studied with Atom Probe Tomography

2016 ◽  
Vol 128 (37) ◽  
pp. 11339-11343 ◽  
Author(s):  
Joel E. Schmidt ◽  
Jonathan D. Poplawsky ◽  
Baishakhi Mazumder ◽  
Özgün Attila ◽  
Donglong Fu ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Coke Formation ◽  
Atom Probe ◽  
Zeolite Crystal ◽  
Methanol To Hydrocarbons

Transformation of methanol to hydrocarbons over Y zeolites with varying Si/Al ratio

1987 ◽  
Vol 52 (7) ◽  
pp. 1701-1707 ◽  
Author(s):  
Miloslav Křivánek ◽  
Nguyen Thiet Dung ◽  
Pavel Jírů
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Coke Formation ◽  
Aliphatic Hydrocarbons ◽  
Y Zeolite ◽  
Y Zeolites ◽  
Methanol To Hydrocarbons

The catalytic activity of Na, H-Y zeolite samples with a varying Si/Al ratio (2·5 to 20) in the transformation of methanol was determined. The amounts of formed individual aliphatic hydrocarbons as function of reaction time were correlated with the amount of Bronsted and Lewis centres on the catalysts. The effect of coke formation on the over-all course of the reaction has been demonstrated.

scholarly journals Correlating nanoscale secondary ion mass spectrometry and atom probe tomography analysis of uranium enrichment in metallic nuclear fuel

The Analyst ◽  
2021 ◽  
Vol 146 (1) ◽  
pp. 69-74
Author(s):  
Elizabeth Kautz ◽  
John Cliff ◽  
Timothy Lach ◽  
Dallas Reilly ◽  
Arun Devaraj
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Fuel ◽  
Atom Probe Tomography ◽  
Secondary Ion Mass Spectrometry ◽  
Atom Probe ◽  
Uranium Enrichment ◽  
Length Scales ◽  
Atom Probe Tomography Analysis ◽  
Secondary Ion ◽  
Tomography Analysis

235U enrichment in a metallic nuclear fuel was measured via NanoSIMS and APT, allowing for a direct comparison of enrichment across length scales and resolutions.

scholarly journals Inside Front Cover: Atom Probe Tomography of Encapsulated Hydroxyapatite Nanoparticles (Small Methods 2/2021)

Small Methods ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 2170004
Author(s):  
Daniel S. Mosiman ◽  
Yi‐Sheng Chen ◽  
Limei Yang ◽  
Brian Hawkett ◽  
Simon P. Ringer ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Hydroxyapatite Nanoparticles ◽  
Front Cover

scholarly journals The distribution of O and N in the surface region of laser-patterned titanium revealed by atom probe tomography

2021 ◽  
pp. 150193
Author(s):  
D. Kuczyńska-Zemła ◽  
G. Sundell ◽  
M. Zemła ◽  
M. Andersson ◽  
H. Garbacz
Keyword(s):  
Atom Probe Tomography ◽  
Surface Region ◽  
Atom Probe

scholarly journals 3D sub-nanometer analysis of glucose in an aqueous solution by cryo-atom probe tomography

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
T. M. Schwarz ◽  
C. A. Dietrich ◽  
J. Ott ◽  
E. M. Weikum ◽  
R. Lawitzki ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Density Functional ◽  
Chemical Characterization ◽  
Analytical Techniques ◽  
Atom Probe ◽  
Characterization Methods ◽  
Signal Deconvolution ◽  
The Stability ◽  
Frozen Solutions ◽  
3D Volume

AbstractAtom Probe Tomography (APT) is currently a well-established technique to analyse the composition of solid materials including metals, semiconductors and ceramics with up to near-atomic resolution. Using an aqueous glucose solution, we now extended the technique to frozen solutions. While the mass signals of the common glucose fragments CxHy and CxOyHz overlap with (H2O)nH from water, we achieved stoichiometrically correct values via signal deconvolution. Density functional theory (DFT) calculations were performed to investigate the stability of the detected pyranose fragments. This paper demonstrates APT’s capabilities to achieve sub-nanometre resolution in tracing whole glucose molecules in a frozen solution by using cryogenic workflows. We use a solution of defined concentration to investigate the chemical resolution capabilities as a step toward the measurement of biological molecules. Due to the evaporation of nearly intact glucose molecules, their position within the measured 3D volume of the solution can be determined with sub-nanometre resolution. Our analyses take analytical techniques to a new level, since chemical characterization methods for cryogenically-frozen solutions or biological materials are limited.

A multi-ion plasma FIB study: Determining ion implantation depths of Xe, N, O and Ar in tungsten via atom probe tomography

2021 ◽  
pp. 113334
Author(s):  
Katja Eder ◽  
Vijay Bhatia ◽  
Jiangtao Qu ◽  
Brandon Van Leer ◽  
Mikhail Dutka ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Ion Plasma

scholarly journals Developing Atom Probe Tomography of Phyllosilicates in Preparation for Extra‐Terrestrial Sample Return

2021 ◽  
Author(s):  
Luke Daly ◽  
Martin R. Lee ◽  
James R. Darling ◽  
Ingrid McCarrol ◽  
Limei Yang ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Sample Return
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