Preparation of composite adsorbent with high performance of heat and mass transfer

• Published in: Chinese science bulletin 2013-10, Vol.58 (30), p.3709-3714
• Main Authors: Bu, XianBiao, Lu, ZhenNeng, Wang, LingBao
• Format: Article
• Language: English
• Subjects: Adsorbents; Adsorption; Ammonia; calcium chloride; Chemistry/Food Science; Earth Sciences; Engineering; Graphite; Heat transfer; Humanities and Social Sciences; Life Sciences; Mass transfer; multidisciplinary; Physics; porosity; Raw materials; refrigeration; Sawdust; Science; Science (multidisciplinary); temperature; thermal conductivity; 传热增强; 传质性能; 制备方法; 吸附性能; 复合吸附剂; 活化温度; 石墨含量; 膨胀石墨
• ISSN: 1001-6538; 1861-9541
• DOI: 10.1007/s11434-013-5994-9

To develop a new composite adsorbent with high performance, fir sawdust and CaCl2 are selected as raw materials. The mass transfer is enhanced by carbonizing and activating the sawdust and heat transfer is enhanced by adding expanded graphite into the adsorbent. The effect of the preparation temperature and the expanded graphite content on the adsorption performance is investigated. The results show that the new adsorbent exhibits a high adsorption performance due to its high porosity, uniform distribution and high content of CaCl2 and high thermal conductivity. Also, the experimental results indicate that the rate of ammonia adsorption on the adsorbent depends on the expanded graphite content and the carbonization and activation temperature. The ad- sorbent prepared at 500℃ and with the expanded graphite content of 30% has the best performance in terms of the adsorption refrigeration, which adsorbs ammonia as high as 0.37 g g^-1 at 10 mix.