窒素
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触媒の窒素乾燥は、120℃と250℃での2段階の定温脱水を目的とする遊離水:遊離水は物質の表面や亀裂にのみ存在し、結晶格子には参加せず、水分子の状態である。物質中の遊離水の含有量は一定ではない。温度が100~110度セルシウスに達すると、遊離水は物質から完全に逃げ出す。
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