Development of Catalytic Decomposition Reactor for Chlorofluorocarbons

氯氟烃催化分解反应器的研制

基本信息

批准号：
11650812
负责人：
NAGATA Hideo
金额：
$ 1.86万
依托单位：
Sasebo National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

We found that there was a good relationship between acid amount of alumina-zirconia catalyst and its decomposition activity for CFC-115 in 1999. However, it was assumed that the kind of acidity (Bronsted acidity and Lewis acidity) also affected the decomposition activity since the relationship was not linear. Thus, we have investigated the relationship between the kind of acidity and decomposition performance of alumina-zirconia catalyst in the present year. As a result, the Lewis acid sites decomposed CFC-115 faster than the Bronsted acid sites, and the Lewis acid sites was more deactivated than the Bronsted acid sites. The hydrolysis of CFC-12 was carried out with alumina-zirconia catalysts. The activity of alumina-zirconia catalyst increased with the passage of time on stream. This attributed to the new acid sites formed during the hydrolysis of CFC-12. On the other hand, the main reaction was the disproportionation of CFC-12 for the oxidative decomposition of CFC-12. The disproportionation reaction proceeded over the Lewis acid sites. CFC-11 and CFC-13 were formed from CFC-12 at early reaction time, and CFC-10 was formed from the reaction of CFC-11 and CFC-12 at long reaction time. The oxidative decomposition of CFC-12 was carried out with alumina-zirconia catalyst loaded with tungsten(VI) oxide. The platinum-loaded catalyst exhibited high performance for the oxidative decomposition of CFC-12. Platinum metal played an important role for the removal of fluorine atom on the catalyst surface.

1999年，我们发现氧化铝-氧化锆催化剂的酸量与其对CFC-115的分解活性之间存在良好的关系。然而，假设酸度的种类（布朗斯台德酸度和路易斯酸度）也影响分解活性，因为这种关系不是线性的。因此，我们今年研究了酸度的种类与氧化铝-氧化锆催化剂的分解性能之间的关系。结果，路易斯酸位点比布朗斯台德酸位点更快地分解CFC-115，并且路易斯酸位点比布朗斯台德酸位点更加失活。 CFC-12的水解是用氧化铝-氧化锆催化剂进行的。氧化铝-氧化锆催化剂的活性随着运行时间的推移而增加。这归因于 CFC-12 水解过程中形成的新酸位点。另一方面，主要反应是CFC-12的歧化反应，以实现CFC-12的氧化分解。歧化反应在路易斯酸位点上进行。 CFC-11和CFC-13由CFC-12在早期反应时间形成，CFC-10由CFC-11和CFC-12在长时间反应时间反应形成。采用负载氧化钨的氧化铝-氧化锆催化剂对CFC-12进行氧化分解。负载铂的催化剂对CFC-12的氧化分解表现出高性能。铂金属对于催化剂表面氟原子的脱除发挥了重要作用。