Development of Catalytic Decomposition of Chlorofluorocarbon in the Presence of Butane

丁烷存在下催化分解氯氟烃的研究进展

• 批准号: 07555251
• 负责人: WAKABAYASHI Katsuhiro
• 金额: $ 5.31万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555251/
• 关键词: Catalyric Decomposition; CFC-12; CFC-115; Pt; Solid Acidity

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

研究了碳氢化合物存在下氯氟烃（CFCs）的催化氧化分解。在我们的前期工作中发现，WO_3/Al_2O_3-ZrO_2催化剂对CFC-115具有很高的催化活性。本文研究了在不同摩尔比的WO_3/Al_2O_3-ZrO_2催化剂上，CFC-115在丁烷存在下的氧化分解反应。在Al_2O_3-ZrO_2摩尔比为0.5 ~ 4的范围内，CFC-115的转化率基本不变。研究了不同金属氧化物掺杂的WO_3/Al_2O_3-ZrO_2催化剂在丁烷存在下对CFC-12的低温氧化分解反应。Pt掺杂的催化剂对CFC-12的活性最高。然后，在Pt掺杂的催化剂上进行CFC-12的氧化分解。Pt掺杂的催化剂比未掺杂的催化剂活性高得多 ...更多信息 n掺杂催化剂。在WO_3/Al_3O_3-ZrO_2催化剂上，在不同的C_4H_2/CFC-12比下，丁烷存在下CFC-12的分解反应均在不同的催化剂上进行<10>。在C_4H_2<10>/CFC-12摩尔比为0.5 ~ 1的范围内，WO_3/Al_2O_3-ZrO_3催化剂对CFC-12具有较高的催化活性。为了研究Al_2O_3-ZrO_2载体的固体酸与活性的关系，用NH_3-TPD法测定了不同ZrO_2含量的Al_2O_3-ZrO_2载体的固体酸量。Al_2O_3-ZrO_2的固体酸量随ZrO_2含量的增加而减少。在无烃存在下，ZrO_2摩尔分数为0.2的Al_2O_3-ZrO_2载体对CFC-12的氧化分解反应活性最高。这些结果表明，催化活性参与了酸性强度和活性的种类。少