TY - JOUR
T1 - Experimental study on the kinetics of water vapor sorption on the inner surface of silica nano-porous materials
AU - Zhang, H.
AU - Gu, W.
AU - Li, M. J.
AU - Li, Z. Y.
AU - Hu, Z. J.
AU - Tao, W. Q.
PY - 2014/11
Y1 - 2014/11
N2 - An experiment of kinetic water vapor adsorption of inner surface of silica nano-porous materials is performed by using the thermal gravimetrical method in a relative humidity range from 0.15 to 0.9 at different temperature levels of 25, 35, 45, 55, 65 °C, respectively. The temperature and humidity environment was supplied by a hygrothermostat. This experiment work shows that the water vapor adsorption equilibrium on silica nano-porous materials belongs to Type IV according to Brunauer's classification and could be well correlated by BET (Stephen Brunauer, Paul Hugh Emmett and Edward Teller) equation. The exponential-decay-2 model proposed in this work could fit the full kinetic adsorption process while the pseudo models failed. Under the same relative humidity, although the water vapor concentration increases significantly with temperature, the saturated water uptake decreases slightly with the increase of temperature for the adverse effect of temperature on adsorption.
AB - An experiment of kinetic water vapor adsorption of inner surface of silica nano-porous materials is performed by using the thermal gravimetrical method in a relative humidity range from 0.15 to 0.9 at different temperature levels of 25, 35, 45, 55, 65 °C, respectively. The temperature and humidity environment was supplied by a hygrothermostat. This experiment work shows that the water vapor adsorption equilibrium on silica nano-porous materials belongs to Type IV according to Brunauer's classification and could be well correlated by BET (Stephen Brunauer, Paul Hugh Emmett and Edward Teller) equation. The exponential-decay-2 model proposed in this work could fit the full kinetic adsorption process while the pseudo models failed. Under the same relative humidity, although the water vapor concentration increases significantly with temperature, the saturated water uptake decreases slightly with the increase of temperature for the adverse effect of temperature on adsorption.
KW - Adsorption equilibriums
KW - Exponential-decay-2 model
KW - Kinetic
KW - Silica nano-porous materials
KW - Water vapor adsorption
UR - http://www.scopus.com/inward/record.url?scp=84907345706&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2014.07.047
DO - 10.1016/j.ijheatmasstransfer.2014.07.047
M3 - Article
AN - SCOPUS:84907345706
SN - 0017-9310
VL - 78
SP - 947
EP - 959
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
ER -