Reactive metal-oxide redox system for a two-step thermochemical conversion of coal and water to CO and H2

被引：20

作者：

Aoki, A ^{[1
]}

Ohtake, H ^{[1
]}

Shimizu, T ^{[1
]}

Kitayama, Y ^{[1
]}

Kodama, T ^{[1
]}

机构：

[1] Niigata Univ, Fac Engn, Dept Chem & Chem Engn, Niigata 9502181, Japan

来源：

ENERGY | 2000年 / 25卷 / 03期

关键词：

D O I：

10.1016/S0360-5442(99)00067-5

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A number of metal-oxide redox systems were examined for a two-step thermochemical conversion of coal and water to CO and H-2 for the purpose of utilizing solar high-temperature heat below 900 degrees C: metal oxide+CHn (coal)-->metal+CO+n/2H(2), metal+H2O-->metal oxide+H-2. In2O3 and SnO2 were found to be the most reactive oxidants for coal under an N-2 gas stream below 900 degrees C. These reactive metal oxides were tested for the proposed two-step cyclic process in the pulse feeding mode of H2O, with a temperature swing and under an N-2 gas stream. The two-step cyclic process using the In2O3/coal mixture could be repeated with high coal conversions of about 80% in the temperature range of 600-900 degrees C by resupplying the consumed coal to the system. The repeated two-step process via the In2O3/In redox system resulted in efficient performance of the net reaction CHn (coal)+H2O-->CO+(n/2+1)H-2, while hydrogen was scarcely produced in the continuous feeding mode of H2O/N-2 over the In2O3/coal mixture, at a constant temperature of 900 degrees C. The separation of recovered In2O3 from the remaining coal ashes by In2O evaporation was also proposed, (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：201 / 218

页数：18

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