Author:
Blackwood JD,McTaggart FK
Abstract
Wood chars were reacted at atmospheric
temperature with hydrogen atoms, oxygen atoms and carbon monoxide, hydrogen
atoms and hydroxyl radicals, produced by the action of a radio frequency field
on hydrogen, carbon dioxide, and water vapour respectively. The chars were
prepared at different temperatures and contained different amounts of oxygen.
The experimental results showed that the gases must be present in the atomic
form before reaction with the carbon can take place and that such species react
on the carbon-surface independently of active sites.
In normal gasification processes the
atomic species appear to be produced at active centres, which for the chars
used could be correlated with specific oxygen groups remaining in the carbon.
It is suggested that these groupings may have a pyran structure. An explanation
has been put forward for the retardation of the carbon-water vapour reaction by
hydrogen, and of the carbon-carbon dioxide reaction by carbon monoxide. These
are considered as due to reverse mechanisms which decrease the concentration of
the atomic species and not to the blocking of active sites by adsorption of the
retardant.
Cited by
36 articles.
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