Calcium Precursors for the Production of CaO Sorhents for Multicycle CO2 Capture

被引：230

作者：

Liu, Wenqiang ^{[1
]}

Low, Nathanael W. L. ^{[1
]}

Feng, Bo ^{[1
]}

Wang, Guoxiong ^{[2
]}

Diniz da Costa, Joao C. ^{[2
]}

机构：

[1] Univ Queensland, Sch Mech & Min Engn, St Lucia, Qld 4072, Australia

[2] Univ Queensland, Sch Chem Engn, St Lucia, Qld 4072, Australia

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2010年 / 44卷 / 02期

基金：

澳大利亚研究理事会;

关键词：

CARBON-DIOXIDE; FLUIDIZED-BED; LOOPING CYCLE; DIFFERENT LIMESTONES; HYDROGEN-PRODUCTION; BIOMASS GASIFIERS; HIGH-TEMPERATURE; SORBENTS; REACTIVITY; CALCINATION;

D O I：

10.1021/es902426n

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A screening of potential calcium precursors for the production of CaO sorbents for CO2 capture at high temperature was conducted in this work. The precursors studied include microsized calcium carbonate (CC-CaO), calcium hydroxide (CH-CaO), nanosized (<70 nm) calcium carbonate (CC70 nm-CaO), nanosized (<160 nm) calcium oxide (CaO160 nm-CaO), calcium acetate hydrate (CA-CaO), calcium L-lactate hydrate (CL-CaO), calcium formate (CF-CaO), calcium citrate tetrahydrate (CCi-CaO), and calcium D-gluconate monohydrate (CG-CaO), The capture capability of these sorbents was investigated using a thermogravimetric analyzer (TGA) for multiple capture cycles. CG-CaO exhibited the best capacity for capturing CO2 with a 1-min conversion of 65.9% and a 30-min conversion of 83.8% at the ninth cycle. Subsequently, a further parametric study was conducted to examine the effect of reaction conditions such as reaction temperature (550-750 degrees C) and CO2 gas concentration (1-15%) on the capture capacity of CG-CaO. The sorbent CG-CaO also showed a much lower decomposition temperature and higher predicted residual conversion after prolonged cycles, compared with CC-CaO.

引用

页码：841 / 847

页数：7

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