| Project/Area Number |
07555251
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 試験 |
|---|
| Research Field |
触媒・化学プロセス
|
|---|
| Research Institution | KYUSHU UNIVERSITY |
|---|
Principal Investigator |
WAKABAYASHI Katsuhiro Kyushu University Department of Technology Professor, 工学部, 教授 (20220832)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
TASHIRO Shizuka Department of Technology KYUSHU UNIVERSITY Technical Official, 工学部, 教務員 (90260710)
KISHIDA Masahiro Department of Technology KYUSHU UNIVERSITY Assistant, 工学部, 助手 (60243903)
NAGATA Hideo Department of Technology KYUSHU UNIVERSITY Assistant, 工学部, 助手 (70221463)
|
|---|
| Project Period (FY) |
1995 – 1996
|
| Project Status |
Completed (Fiscal Year 1996)
|
| Budget Amount *help |
¥8,300,000 (Direct Cost: ¥8,300,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥7,500,000 (Direct Cost: ¥7,500,000)
|
|---|
| Keywords | Catalyric Decomposition / CFC-12 / CFC-115 / Pt / Solid Acidity |
|---|
| Research Abstract |
We have investigated the catalytic oxidative decomposition of chlorofluorocarbons (CFCs) in the presence of hydrocarbons. In our previous work, it was found out that WO_3/Al_2O_3-ZrO_2 catalyst exhibited a high activity for CFC-115. In this work, the particicality of the catalitic reaction was investigated.
The oxidative decomposition of CFC-115 in the presence of butane was carried out over various molar ratios WO_3/Al_2O_3-ZrO_2 catalysts. The CFC-115 conversion was constant in the range of Al_2O_3-ZrO_2 molar ratios from 0.5 to 4. The similar tendency was shown in the range of tungsuten oxides contents from 2.2 to 9wt%.
WO_3/Al_2O_3-ZrO_2 catalysts doped with various metal oxides were investigated for the oxidative decomposition of CFC-12 in the presence of butane at low temperatures. The Pt doped catalyst exhibitedmthe highest activity for CFC-12. Then, the oxidetive decomposition of CFC-12 was carried out over the Pt-doped catalyst. The Pt-doped catalyst was much more active than no
… More
n-doped catalyst. Thus, it is considered that the WO_3/Al_2O_3-ZrO_2 catalyst was depressed the fluorination of active sites by doping with Pt.
The decomposition of CFC-12 in the presence of butane were carried out under various C_4H_<10>/CFC-12 ratios over WO_3/Al_3O_3-ZrO_2 catalyst. The WO_3/Al_2O_3-ZrO_3 catalyst exhibited a high activity for CFC-12 in the range of C_4H_<10>/CFC-12 molar ratios from 0.5 to 1.
It was found that the high activity of WO_3/Al_2O_3-ZrO_2 catalyst for CFCs is caused by the solid acidity of the catalyst. In order to investigate the relationship betwteen solid acidity and activity of Al_2O_3-ZrO_2 carrier, the amount of solid aciditiy of Al_2O_3-ZrO_2 carrier various ZrO_2 content was measured by NH3-TPD method. The amount of solid acidity of Al_2O_3-ZrO_2 decreaced with an increace in ZrO_2 content. However, Al_2O_3-ZrO_2 carrier with a ZrO_2 molar fraction of 0.2 was the most active for the oxidative decomposition of CFC-12 in the absence of hydrocarbons over the carrier used as a catalyst. These results suggests that the catalytic activity participates in the acidic strength and kind of activity. Less
|
