Sorbent enhanced steam reforming (SESR) of methane using dolomite as internal carbon dioxide absorbent:: Limitations due to Ca(OH)2 formation

被引：68

作者：

Hildenbrand, N ^{[1
]}

Readman, J ^{[1
]}

Dahl, IM ^{[1
]}

Blom, R ^{[1
]}

机构：

[1] SINTEF, Mat & Chem, N-0314 Oslo, Norway

来源：

APPLIED CATALYSIS A-GENERAL | 2006年 / 303卷 / 01期

关键词：

hydrogen production; natural gas; sorbent enhanced steam reforming; dolomite; nickel catalyst; fluidized bed reactor;

D O I：

10.1016/j.apcata.2006.02.015

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

High hydrogen yields can be obtained by sorbent enhanced steam reforming (SESR) of methane at temperatures below 600 degrees C by using calcined dolomite as internal sorbent together with a Ni/NiAl2O4 catalyst in a fluidized bed reactor. Effluent gas compositions containing > 90 mole.% H-2 are obtained, indicating that the sorbent acts efficiently after an induction period with low methane conversion. XRD examination of the catalyst/sorbent powder after different times-on-stream shows that during the induction period, CaO of the calcined dolomite reacts with water vapor to form Ca(OH)(2). The induction period is directly proportional to the time the catalyst/sorbent mixture is in contact with steam at temperatures below 600 degrees C where Ca(OH)(2) is thermodynamically stable. The catalyst/sorbent mixture can be regenerated at temperatures above 800 degrees C in H-2/N-2/H2O atmosphere. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：131 / 137

页数：7

共 16 条

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