复合吸附剂CaCl_2/MWNT低湿环境下吸附性能的实验研究
|
摘要
以碾磨法配制了一种由氯化钙(CaCl_2)与多壁碳纳米管(MWNT)组成的复合吸附剂,测得3种不同配比复合吸附剂样品(氯化钙质量含量分别为40%、50%、55.6%)在低湿度情况下的吸附情况。分析结果表明,随着湿度升高,复合吸附剂吸附速度越快,平衡吸附量越高;但在低湿度情况下(25℃、相对湿度35%),当氯化钙含量达到50%及以上时,由于复合吸附剂外表面氯化钙吸水形成带结晶水的氯化钙晶体从而影响水蒸气向内表面扩散过程,导致吸附剂吸附速度降低。
Composite CaCl_2/MWNT was prepared via mixing CaCl_2 with multi-walled carbon nanotube(MWNT)by grinding method.The adsorption performance of composite CaCl_2/MWNT with three different CaCl_2 mass ratios(40%,50%,55.6%)was studied under low humidity environment.The results show that the water equilibrium adsorption capacity and rate of composite rises as the relative humidity increases.Moreover,when CaCl_2 mass ratio reaches more than 50% under the condition of low humidity(at 25 ℃ and relative humidity of 35%),the surface of the composite is covered with CaCl_2,which takes up water vapor and forms the calcium chloride crystals,resulting in the decrease of adsorption rate of the composite adsorbent.
Composite CaCl_2/MWNT was prepared via mixing CaCl_2 with multi-walled carbon nanotube(MWNT)by grinding method.The adsorption performance of composite CaCl_2/MWNT with three different CaCl_2 mass ratios(40%,50%,55.6%)was studied under low humidity environment.The results show that the water equilibrium adsorption capacity and rate of composite rises as the relative humidity increases.Moreover,when CaCl_2 mass ratio reaches more than 50% under the condition of low humidity(at 25 ℃ and relative humidity of 35%),the surface of the composite is covered with CaCl_2,which takes up water vapor and forms the calcium chloride crystals,resulting in the decrease of adsorption rate of the composite adsorbent.
引文
1 Jannot Y.Water production by condensing atmospheric humidity-evaluation of the process in sahelian area[J].Revue Generale De Thermique,1993,32(384):705
2 Aristov Y I,Tokarev M M,Cacciola G,et al.Selective water sorbents for multiple applications,1.CaCl2confined in mecropores of silica gel:Sorption properties[J].Reaction Kinetics Catal Lett,1996,59(2):325
3 Aristov Y I,Tokarev M M,Restuccia G,et al.Selective water sorbents for multiple applications,2.CaCl2confined in micropores of silica gel:Sorption properties[J].Reaction Kinetics Catal Lett,1996,59(2):335
4 Aristov Y I,Marco G D,Tokarev M M,et al.Selective water sorbents for multiple applications,3.CaCl2solution confined in microand mesoporous silica gels:Pore size effect on the“solidificationmelting”[J].Reaction Kinetics Catal Lett,1997,61(1):147
5 Aristov Y I,Restuccia G,Tokarev M M,et al.Selective water sorbents for multiple applications,11.CaCl2confined to expanded vermiculite[J].Reaction Kinetics Catal Lett,2000,71(2):377
6 Zhu D,Wu H,Wang S.Experimental study on composite silica gel supported CaCl2sorbent for low grade heat storage[J].Int J Thermal Sci,2006,45(8):804
7 Cortes F B,Chejne F,Carrasco-Marin F,et al.Water sorption on silica-and zeolite-supported hygroscopic salts for cooling system applications[J].Energy Cenvers Management,2012,53(1):219
8 赵朝晖,朱冬生,郑成.氯化钙-13X分子筛复合吸附剂的实验研究[J].广州化工,2008,33(3):25
9 Chan K,Chao C Y,Bahrami M.Heat and mass transfer characteristics of a zeolite 13X/CaCl2composite adsorbent in adsorption cooling systems[C]//ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science.San Diego,2012
10 Zhang H Q,Yuan Y P,et al.Inorganic composite adsorbent CaCl2/MWNT for water vapor adsorption[J].RSC Adv,2015,5:38630
2 Aristov Y I,Tokarev M M,Cacciola G,et al.Selective water sorbents for multiple applications,1.CaCl2confined in mecropores of silica gel:Sorption properties[J].Reaction Kinetics Catal Lett,1996,59(2):325
3 Aristov Y I,Tokarev M M,Restuccia G,et al.Selective water sorbents for multiple applications,2.CaCl2confined in micropores of silica gel:Sorption properties[J].Reaction Kinetics Catal Lett,1996,59(2):335
4 Aristov Y I,Marco G D,Tokarev M M,et al.Selective water sorbents for multiple applications,3.CaCl2solution confined in microand mesoporous silica gels:Pore size effect on the“solidificationmelting”[J].Reaction Kinetics Catal Lett,1997,61(1):147
5 Aristov Y I,Restuccia G,Tokarev M M,et al.Selective water sorbents for multiple applications,11.CaCl2confined to expanded vermiculite[J].Reaction Kinetics Catal Lett,2000,71(2):377
6 Zhu D,Wu H,Wang S.Experimental study on composite silica gel supported CaCl2sorbent for low grade heat storage[J].Int J Thermal Sci,2006,45(8):804
7 Cortes F B,Chejne F,Carrasco-Marin F,et al.Water sorption on silica-and zeolite-supported hygroscopic salts for cooling system applications[J].Energy Cenvers Management,2012,53(1):219
8 赵朝晖,朱冬生,郑成.氯化钙-13X分子筛复合吸附剂的实验研究[J].广州化工,2008,33(3):25
9 Chan K,Chao C Y,Bahrami M.Heat and mass transfer characteristics of a zeolite 13X/CaCl2composite adsorbent in adsorption cooling systems[C]//ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science.San Diego,2012
10 Zhang H Q,Yuan Y P,et al.Inorganic composite adsorbent CaCl2/MWNT for water vapor adsorption[J].RSC Adv,2015,5:38630