Oxidative Capture of SOx and NOx by Activated Carbon Fiber

活性炭纤维氧化捕集SOx和NOx

基本信息

批准号：
07044161
负责人：
MOCHIDA Isao
金额：
$ 2.3万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
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

项目摘要

Application particular to ACF now under development is removal of SOx and NOx in the atmosphere as well as flue gas. The basic principle of SOx removal is capture of SO_2 in the form of H_2SO_4. Continuous recovery of conc.aq.H_2SO_4 is now pursued. Removal of NOx relies basically on the reduction to N_2 with NH_3 or oxidation to NO_2 to be trapped by aq.bases. The inhibition of humidity in the atmosphere at ambient temperature is a problem. The hydrophobic properties of ACF can be compatible with its oxidation activity by selecting the precursor activation extent, and post heat-treatment.Acid rain is one of the most concerned problems for the global environment. Application of ACF to solve this problem is expected.The authers had found that ACF with larger amount of nitrogen content showed higher catalytic activity for dehydrochlorination of 1,2-dichloroethane into vinyl chloride at around 360ﾟC.It was suggested that pyridinic nitrogen included in the ACF worked as lewis base. Surface investigation by XPS provided one proof that pyridinic nitrogen worked as active site. For the aim of improvement of catalytic performances, pyridine CVD on the surface of pitch based ACF had examined by same way of benzene CVD as mentioned before. It was found that nitrogen content increased and catalytic activity raised. Pich based ACF showed low catalytic activity and short life time. On the other hand, the ACF of 8 wt% weight gain showed higher catalytic activity and long life time. The ACF of 16 wt% weight gain showed more higher initial activity, but resulted in shorter life time than the ACF of 8 wt% weight gain. These results propose a new method of surface modification of carbon materials to create active sites.

目前正在开发的ACF应用是去除大气和烟道气中的SOx和NOx。去除SOx的基本原理是以H_2SO_4的形式捕获SO_2，目前正在追求连续回收conc.aq.H_2SO_4。 NOx的去除基本上依靠NH_3还原为N_2或氧化为NO_2并被水基捕获。大气中湿度的抑制。通过选择前体活化程度和后热处理，ACF的疏水性能与其氧化活性是一个问题。酸雨是ACF在全球环境中应用最受关注的问题之一。作者发现，含氮量较大的ACF在1,2-二氯乙烷脱氯化氢反应生成氯乙烯的催化活性较高。 360℃。表明ACF中包含的吡啶氮作为路易斯碱。XPS表面研究提供了吡啶氮作为活性位点的证据。为了提高催化性能，在沥青表面进行吡啶CVD。与前面提到的苯CVD相同的方法检测了基于Pich的ACF，发现氮含量增加并且催化活性提高。另一方面，增重8%的ACF表现出较高的催化活性和较长的使用寿命，增重16%的ACF表现出更高的初始活性，但寿命较短。 ACF 增重 8 wt% 这些结果提出了一种碳材料表面改性以产生活性位点的新方法。