A study of CO sensors with oscillatory response

Li, LiLin; Włodarski, W.; Galatsis, K.; Powell, David A.

doi:10.1016/j.snb.2003.07.003

Cited by 7 publications

(4 citation statements)

References 16 publications

(14 reference statements)

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“…Conversion oscillations similar to those observed here were previously observed in single crystal transition metal catalysts, e.g. for Pt, Rh and Ir [20][21][22][23][24]. Usually, oscillations are related to reduction/oxidation cycles, resulting, for example, in non linear rate phenomena arising from oxide or sub-surface layers that deactivate slowly the reactive surface [24].…”

Section: Ht Exafs Screeningsupporting

confidence: 82%

High Throughput In Situ EXAFS Instrumentation for the Automatic Characterization of Materials and Catalysts

Tsapatsaris¹,

Beesley²,

Weiher³

et al. 2007

AIP Conference Proceedings

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Abstract. An XAS data acquisition and control system for the in situ analysis of dynamic materials libraries under control of temperature and gaseous environment has been developed. It was integrated at the SRS in Daresbury, UK, beamline 9.3, using a Si (220) monochromator and a 13 element solid state Ge fluorescence detector. The core of the system is an intelligent X, Y, Z, 0 positioning system coupled to multi-stream quadrupole mass spectrometry analysis (QMS). The system is modular and can be adapted to other synchrotron radiation beamlines. The entire software control was implemented using Labview and allows the scan of a variety of library sizes, in several positions, angles, gas compositions and temperatures with minimal operator intervention. The system was used for the automated characterization of a library of 91 catalyst precursors containing ternary combinations of Cu, Pt, and Au on y-Al 2 0 3 , and for the evaluation and structural characterization of eight Au catalysts supported on A1 2 0 3 and Ti0 2 . Mass spectrometer traces reveal conversion rate oscillations in 6wt % Au/yAl 2 0 3 catalysts. The use of HT experimentation for in situ EXAFS studies demonstrates the feasibility and potential of HT in situ XAFS for synchrotron radiation studies.

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Section: Ht Exafs Screeningsupporting

confidence: 82%

High Throughput In Situ EXAFS Instrumentation for the Automatic Characterization of Materials and Catalysts

Tsapatsaris¹,

Beesley²,

Weiher³

et al. 2007

AIP Conference Proceedings

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“…Over the past few decades, there has been considerable interest in investigating oscillatory reactions occurring at gas/solid interfaces 1,2,3,4 . Among these, the oscillation in the oxidative reaction of CO on a SnO 2 -Pt surface are the most studied 1,2,3 .…”

Section: Introductionmentioning

confidence: 99%

Detecting H₂S oscillatory response using surface plasmon spectroscopy

Gaspera

Martucci

2013

MRS Proc.

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The oscillatory change in the optical absorbance of NiO-TiO2 film containing Au nanoparticles in the presence of H2S gas are investigated. The oscillatory phenomena could be monitored by looking at the variation of the surface plasmon resonance peak of the Au nanoparticles embedded in the TiO2-NiO matrix. Au nanoparticles act as optical probes in the detection of H2S, while the oxide matrix is responsible for the catalytic oxidation of H2S. To the best of our knowledge, it is the first time that oscillatory phenomena are monitored by optical spectroscopy

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“…A Pt coil and a SnO 2 bead deposited on a pair of co-axial Pt coils were fabricated [4]. Their surfaces were modified with Pd by wet impregnation.…”

Section: Methodsmentioning

confidence: 99%

“…In our previous paper, it was demonstrated that the noble metal catalyst (Pd, Pt) doped in SnO2 plays a key role in the generation of the oscillation. In addition, without SnO2, bear Pt coils also shows a unique oscillatory sensing behavior when exposed to CO [4]. A series of experiments have been carried out to investigate the CO response for bare Pt with different structures [5].…”

Section: Introductionmentioning

confidence: 99%

Pd modified CO sensors with oscillatory response

Li¹,

Włodarski²,

Akolekar³

et al.

Proceedings of IEEE Sensors, 2004.

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In this paper, oscillatory changes in the conductance of Pd modified SnO 2 bead and Pd modified Pt coil in the presence of CO were investigated and compared. Changes in frequency were found for both sensors with varied CO concentrations. For the Pd modified SnO 2 sensor, the frequency of the waveform increased with increasing CO concentration, while for the Pd modified Pt coil, the frequency decreased. Influences of the surface temperature to CO responses were examined. The selectivity against H 2 was also tested.

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A study of CO sensors with oscillatory response

Cited by 7 publications

References 16 publications

High Throughput In Situ EXAFS Instrumentation for the Automatic Characterization of Materials and Catalysts

High Throughput In Situ EXAFS Instrumentation for the Automatic Characterization of Materials and Catalysts

Detecting H₂S oscillatory response using surface plasmon spectroscopy

Pd modified CO sensors with oscillatory response

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A study of CO sensors with oscillatory response

Cited by 7 publications

References 16 publications

High Throughput In Situ EXAFS Instrumentation for the Automatic Characterization of Materials and Catalysts

High Throughput In Situ EXAFS Instrumentation for the Automatic Characterization of Materials and Catalysts

Detecting H2S oscillatory response using surface plasmon spectroscopy

Pd modified CO sensors with oscillatory response

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Resources

About

Detecting H₂S oscillatory response using surface plasmon spectroscopy