O_2 Release of Mn-Based Oxygen Carrier for Chemical Looping Air Separation (CLAS): An Insight into Kinetic Studies

Wen-Ju Wang ； Bin Zhang ； Guo-Ping Wang ； Yun-Hua Li

《Aerosol and Air Quality Research》 16卷2期 (2016/02) Pp. 453-463

https://doi.org/10.4209/aaqr.2014.07.0140

並列摘要

Chemical looping air separation (CLAS) is an air separation technology with a relatively small energy footprint. In this contribution, the kinetic study of Mn-based oxygen carriers has been carried out in a CLAS process. The O_2 release behavior was investigated under Ar in a fixed bed. Results showed O_2 release amounts increase gradually with an increasing temperature. Moreover, fitting various gas-solid reaction mechanisms with the experimental data was used to obtain the chemical reaction kinetics for MnO_2 and Mn_2O_3 for O_2 release. As for all involved gas－solid reaction mechanisms, the first-order chemical reaction model (C1) and Avrami–Erofe'ev random nucleation and subsequence growth model (A2) fitted well with O_2 release experimental data for MnO_2 and Mn_2O_3, respectively. Furthermore, activation energy, pre-exponential factor and reaction order were also determined for these models.

並列關鍵字

Mn-based oxygen carrier ； Kinetic ； Activation energy ； Chemical looping air separation (CLAS) ； O_2 release