Abstract
Microwave energy was used to regenerate the NO x saturated char samples. It was found that the temperature of gas produced from microwave regenerations was close to the room temperature, and CO and CO 2 were released approximately 10 seconds after microwave energy was applied. These observations suggest that the sites occupied by NO x may absorb more microwave energy than pure char. Consequently, these adsorption sites heat up rapidly and may turn into hot spots in a very short time. The reduction reactions of adsorbed NO x by carbon takes place at these hot spots. The NO x are adsorbed on char in the forms of NO 2 and HNO 3 when moisture and oxygen are present in the feed gas. This study shows that the higher percentage of HNO 3 in the adsorbed NO x results in higher temperatures of product gas and hence higher reduction efficiency of the adsorbed NO x. Therefore, it is inferred that the sites occupied by HNO 3 may absorb more microwave energy than those by NO 2. Up to 90% of the adsorbed NO x was reduced in this microwave regeneration process.
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