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The products of the thermal decomposition of CH3CHO
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10.1063/1.3604005
/content/aip/journal/jcp/135/1/10.1063/1.3604005
http://aip.metastore.ingenta.com/content/aip/journal/jcp/135/1/10.1063/1.3604005

Figures

Image of FIG. 1.
FIG. 1.

Photoionization mass spectra of the thermal cracking products of acetaldehyde are shown. The fixed-frequency PIMS uses the 9th harmonic of a YAG laser, 118.2 nm or 10.487 eV, for photoionization. Samples of acetaldehyde entrained in He buffer gas are subjected to pyrolysis by a 1 mm × 2 cm SiC tube heated to 1475 K. Typical samples have 0.3% acetaldehyde mixed with 2 atm He and are delivered to the μtubular reaction via a general valve pulsed at 10 Hz. The approximate pressure in the μtubular reactor is 150 Torr and the centerline temperature is within 100–200 K of the wall temperature. The transit time through the heated SiC tube is roughly 50–100 μs. There are four different spectra in this figure. Bottom Trace (black): CH3CHO; 2nd Trace (red): CH3CDO, 3rd Trace (black): CD3CHO, 4th Trace (red): CD3CDO.

Image of FIG. 2.
FIG. 2.

Matrix infrared absorption spectra of the thermal cracking products of acetaldehyde are shown. Samples of acetaldehyde entrained in an Ar buffer gas are subjected to pyrolysis by a 1 mm × 2 cm SiC tube heated to 1275 K. Typical samples have 0.3% acetaldehyde mixed with 1 atm Ar and are delivered to the μtubular reaction via a general valve pulsed at 10 Hz. The approximate pressure in the μtubular reactor is 75 Torr and the centerline temperature is within 100–200 K of the wall temperature. The transit time through the heated SiC tube is roughly 50–100 μs. There are three different spectra in this figure. Bottom Trace (green): Ar carrier gas heated to 1675 K, 2nd Trace (black): CH3CHO/Ar, 3rd Trace (red): CH3CDO/Ar.

Image of FIG. 3.
FIG. 3.

The PIMS resulting from cracking CD3CHO at 1275 K when the synchrotron at the LBNL's Advanced Light Source is used to photoionize the pyrolysis products. The tunable VUV light source is set to 12.9 eV in order to ionize methane, acetylene and water. Samples of acetaldehyde-d3 entrained in Ar buffer gas are subjected to pyrolysis by a 1 mm × 2 cm SiC tube heated to 1275 K. Typical samples have 1% acetaldehyde mixed with 1 atm Ar and are delivered to the μtubular reaction via a general valve pulsed at 10 Hz. The approximate pressure in the μtubular reactor is 75 Torr and the centerline temperature is within 100–200 K of the wall temperature. The transit time through the heated SiC tube is roughly 50–100 μs.

Tables

Generic image for table
Table I.

A summary of thermal cracking products from acetaldehyde as identified by PIMS and IR spectroscopy.

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/content/aip/journal/jcp/135/1/10.1063/1.3604005
2011-07-07
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The products of the thermal decomposition of CH3CHO
http://aip.metastore.ingenta.com/content/aip/journal/jcp/135/1/10.1063/1.3604005
10.1063/1.3604005
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