摘要
采用球磨、热处理、碱溶液浸泡等物理和化学方法对天然沸石进行改性处理,探讨了沸石粒度、热处理温度和保温时间、碱溶液浓度对沸石调湿性能和孔结构的影响。结果表明,对沸石进行球磨处理增大了比表面积但并不是粒度越细,吸放湿速率越大,当粒度小于0.15mm时,吸放湿速率开始减小;热处理除去了沸石内的水和杂质,增大了比表面积和孔容积;碱溶液处理清除沸石孔内无定形凝胶杂质,扩大了微孔、细化了大孔,提高了吸放湿性能;采用粒度为100目、NaOH质量摩尔浓度为1mol/L、热处理温度200℃、保温2h对沸石改性处理后,沸石吸湿率、放湿率分别提高了3.5倍和4.06倍,小于50nm的孔径约占65%。
The natural mordenite was modified by physical and chemieal methods such as milling, heat-treatment, the alkali solution immersion. The influence of granularity, treated temperature and time, concentration of alkali solution on the humidity control performance and the pore structure were studied. The result showed that the specific surface area of moedenite increased by milling, absorption and desorption speed of milled mordenite was not increasing as its particle size decreasing, when the particle size was less than 0. 15 mm, the absorption and desorption speed began to decrease; the water and impurities of moedenite was removed by heat-treatment, the specific surface area and pore volume were in- creased; the gel amorphous and impurities were eleared and by selective dissolution and recrystallization by alkaline solu- tion treatment, as a result the mesopores was formed, microporous was expanded and macroporous was refined, absorp- tion and desorption properties were improved; under the treated conditions that particle size was 100 mesh, concentration of NaOH was 1 mol/L, heating temperature was 200 ℃ and heating time was 2 hours, its absorption and desorption rate was greatly improved and its moisture absorption, desorption rates were increased by 3.5 fold and 4. 06 fold, the pore of its diameter less than 50 nm was approximately 65%.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2013年第12期15-20,共6页
Journal of Wuhan University of Technology
基金
国家自然科学基金(51208209)
华南理工大学亚热带建筑科学国家重点实验室开放基金(2014KB24)
关键词
沸石
改性
调湿
mordenit
modify
humidity control
