| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a freshness retaining technique enabling ethylene, or the like, to be removed efficiently and residual ozone to be removed efficiently as well. SOLUTION: The objective freshness retaining system works as follows: a gas to be treated is transferred through an ozone generating means 11, a photocatalyst unit 12 and an ozone decomposition catalyst 13 in this order; the ethylene in the gas is oxidatively decomposed by the ozone generating means 11 to form e.g. formic acid, acetic acid, formaldehyde; these ethylene oxidation products are decomposed into carbon dioxide and water by the photocatalyst unit 12 such as a titanium oxide irradiated with ultraviolet rays; and the ozone produced by the ozone generating means 11 and left unconsumed is decomposed by the ozone decomposition catalyst 13. Since the ethylene oxidation products as a catalytic poison for the ozone decomposition catalyst 13 has been removed by the photocatalyst unit 12, the deterioration with time of the ozone decomposition catalyst 13 can be suppressed.</p> |
