Effect of water on the durability of BPO{sub 4} in the decomposition of Freon 12

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie00042a033· OSTI ID:63308

Imamura, Seiichiro; Higashihara, Takao; Utani, Kazunori ^[1]

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1. Kyoto Inst. of Technology (Japan). Dept. of Chemistry

Water improved the durability of titanica silica (TiO{sub 2}/SiO{sub 2}), phosphate supported zirconia (PO{sub 4}/ZrO{sub 2}), and boron phosphate (BPO{sub 4}) catalysts in decomposing dichlorodifluoromethane (Freon 12). Although configuration changes of TiO{sub 2}/SiO{sub 2} and of PO{sub 4}/ZrO{sub 4} occurred after about 30 h, BPO{sub 4} retained its activity without any configuration change even after 35 h. Water eliminated inorganic fluorides accumulated on the surface of BPO{sub 4} presumably in the form of hydrogen fluoride. Methanol exhibited little reactivating effect on BPO{sub 4}. Two catalyst beds were used in a series, and methanol was completely decomposed on Co{sub 3}O{sub 4} in the first bed at 275 C, at which Freon 12 did not decompose much. When the remaining Freon 12 was decomposed over BPO{sub 4} in the second bed, the life of BPO{sub 4} was prolonged remarkably due to the water produced from methanol in the first bed. Thus only water was effective as a reactivating reagent, and hydrogen atoms of methanol did not work directly.

• Sponsoring Organization: USDOE
• OSTI ID: 63308
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 3 Vol. 34; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
BORON PHOSPHATES
CATALYSTS
DECOMPOSITION
EXPERIMENTAL DATA
FREONS
MORPHOLOGICAL CHANGES
PERFORMANCE
REGENERATION
SERVICE LIFE
SILICON OXIDES
TITANIUM OXIDES
ZIRCONIUM OXIDES