JP2908233B

JP2908233B

PURPOSE:To obtain a catalyst having high efficiency of decomposition of ozone and hardly deteriorating its catalytic performance with the lapse of time by producing manganese dioxide having a large BET specific surface area. CONSTITUTION:Almost spherical fine particle-shaped manganese oxide is forme...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: SHIMIZUGAWA RYOICHI, KISHIKAWA TSUTOMU, KAMISAKA KENICHI, KENMOCHI YOJI, YAEGASHI NOBUO
Format: Patent
Sprache:eng
Schlagworte:
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
THEIR RELEVANT APPARATUS
TRANSPORTING
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Beschreibung
Zusammenfassung:PURPOSE:To obtain a catalyst having high efficiency of decomposition of ozone and hardly deteriorating its catalytic performance with the lapse of time by producing manganese dioxide having a large BET specific surface area. CONSTITUTION:Almost spherical fine particle-shaped manganese oxide is formed by blowing oxidizing gas on manganese-contg. stock, and Mn and impurity components in the manganese oxide are dissolved by subjecting the oxide to acid treatment at a temp. below ordinary temp. to obtain almost spherical fine particles based on porous manganese dioxide, contg. impurities as the balance and having surface ruggedness, many pores, 0.1-5mum average particle diameter and >=150m /g BET specific surface area. The objective catalyst for decomposition of ozone is produced using the fine particles.