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Journal of Systems Biology & Proteome Research
|
Volume 2
J u n e 2 5 - 2 7 , 2 0 1 8 | D u b l i n , I r e l a n d
MASS SPECTROMETRY
AND PROTEOMICS
International Conference on
Muto S et al., J Syst Biol Proteome Res 2018, Volume 2
DEVELOPMENT OF NEW
ENVIRONMENTAL HIGH-VOLTAGE
TRANSMISSION ELECTRON
MICROSCOPE EQUIPPED WITH
QUADRUPOLE MASS SPECTROMETER
FOR OBSERVING CATALYTIC
REACTIONS
Muto S, Arai S, Higuchi T
and
Ohta S
Nagoya University, Japan
I
n this paper, we introduce the new high-voltage electron microscopy-
quadrupole mass spectrometer (HVEM-QMS) system and demonstrate
redox reactions where the product gas species are unambiguously detected,
associated with the expected structural changes, as follows: (i) CO
2
as a
result of carbon nanotube (CNT) combustion by a Pd nano-particle catalyst
in O
2
atmosphere was detected when a mixture of a CNT bundle and Pd fine
particles was heated in ~10 Pa of O
2
gas. The Pd particles started to move
around in CNTs > ~200°C, and it appeared that the Pd particles decomposed
the CNTs, because carbon atoms contacting Pd particles surface were burned
to CO
2
, when QMS of m/Z 44 was detected; a good correlation was obtained
between the TEM image and Q-Mass spectra, without a significant delay of
the CO
2
detection onset with respect to the start of the Pd particles motion.
(ii) Reduction of Rd
2
O
3
nano-particles in vacuum: Rd
2
O
3
nano-particles
supported on ZrO
2
substrate were heated in vacuum, which was reduced to
metal at temperatures > ~200°C. Interestingly QMS detected no oxygen even
during the transformation of Rd
2
O
3
to metallic Rh. Instead species of m/Z 44
(in the form of CO
2
) were unambiguously detected. This suggests that the
emitted oxygen atoms were so chemically active in the atomic form as to
instantly react with the surrounding carbon-origin contaminations, forming
CO
2
. Further demonstrations will be presented.
Muto S has completed his PhD at the age of 28
years from Osaka University, Japan. He is the
professor of Institute of Materials and Systems
for Sustainability, Nagoya University, Japan and
the director of High-Voltage Electron Micros-
copy Laboratory of Nagoya University. He has
over 200 publications that have been cited over
2500 times, and his publication H-index is 27.
His main interest is to visualize physical/chemi-
cal properties of various functional materials at
nanometer scale, using transmission electron
microscopy/spectroscopy techniques.
smuto@imass.nagoya-u.ac.jpBIOGRAPHY