Determination of intrinsic rate constants of the CaO-CO2 reaction

被引：202

作者：

Sun, Ping ^{[1
]}

Grace, John R. ^{[1
]}

Lim, C. Jim ^{[1
]}

Anthony, Edward J. ^{[1
,2
]}

机构：

[1] Univ British Columbia, Dept Chem & Biol Engn, Vancouver, BC V6T 1Z3, Canada

[2] CANMET Ctr, Ottawa, ON K1A 1M1, Canada

来源：

CHEMICAL ENGINEERING SCIENCE | 2008年 / 63卷 / 01期

关键词：

CO2; removal; Ca-based sorbent; kinetic study; intrinsic rate constant; thermogravimetric reactor; pressurized conditions;

D O I：

10.1016/j.ces.2007.08.055

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The rate constant of the CaO-CO2 reaction was studied for two sorbents using an atmospheric thermogravimetric analyzer (ATGA) and a pressurized thermogravimetric analyzer (PTGA). A grain model was used to determine the rate-controlling steps. The intrinsic rate was found to have a variable order with respect to CO2 partial pressure, with a first-order reaction changing to zero-order dependence when the CO2 partial pressure exceeded similar to 10 kPa. No further rate enhancement was observed under pressurized conditions, which was explained by a two-step Langmuir mechanism. The activation energies were 29 +/- 4 and 24 +/- 6 kJ/mol for the limestone and dolomite tested. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：47 / 56

页数：10

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