Temperature programmed desorption (TDP) was used to investigate the impact of heating rate on desorption performance of CO2 attached to 13X zeolite. Based on the Polanyi?Wigner equation, the desorption activation energy Ed under different heating rates was calculated without any assumed conditions. The results showed that two desorption peaks on TPD curve were produced while heating 13X molecular sieve full of CO2 at room temperature, one was located at low temperature, called as low-temperature peak, the other was at high temperature, called as high-temperature peak. Ed changed with ?. The low-temperature peak related to the desorption activation energy Ed,L decreased logarithmically with respect to increasing ?, while Ed,H remained the same, and the value of Ed,L was smaller than that of Ed,H. So Ed calculated without assumptions were more reasonable and accurate than the value calculated by variable heating rate method. For the same adsorption capacity, desorption capacity of CO2 called Qd,L at low temperature increased gradually with the growth of ?, while Qd,H at high temperature decreased, and Qd,L was far greater than Qd,H. The different acting force of physisorption and chemisorption was the key factor that resulted in a difference between high-temperature peak and low-temperature peak on adsorption mechanism.
Yalou GUO Hui ZHANG Yingshu LIU Ziling ZHAO Xuankai ZHANG Dong LI
. Impact of Heating Rate on Desorption Performance of CO2 Attached to 13X Zeolite[J]. The Chinese Journal of Process Engineering, 2018
, 18(1)
: 88
-95
.
DOI: 10.12034/j.issn.1009-606X.217229
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