期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 82, 期 3-4, 页码 190-198出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2008.01.012
关键词
adsorption; carbonyl sulfide; methyl mercaptan; layered double hydroxide; hydrotalcite
资金
- the Kentucky Science and Engineering Foundation
- the Kentucky Science and Engineering Foundation [KSEF-148-502-05-134]
Mixed oxides, prepared via the thermal decomposition of layered double hydroxides (LDHs), were screened gravimetrically for their ability to adsorb carbonyl sulfide (COS). Based on promising results obtained for Ni/Mg/Al, Ni/Mg/Fe and Co/Mg/Al mixed oxides, a study was undertaken to optimize the composition of these materials for COS adsorption. To investigate the effect of the M(II):M(III) ratio, LDHs of the type [M(z)Mg(y)Al(x)(OH)(2)(CO(3))(x/2).0.5H(2)O (where M = Ni or Co, and x + y + z = 1) were prepared at values of x corresponding to 0.33 and 0.20. Simultaneously, the elemental ratio of transition metal to magnesium (z/y) was varied. Mixed oxides obtained from the resulting LDHs were tested in fixed bed mode with a feed of 100 ppm COS in N(2) to determine breakthrough capacity. In general Ni/Mg/Al mixed oxides showed the best performance, a composition with Ni/Mg/Al = 0.32/0.48/0.20 showing the best adsorption capacity. Treatment of the spent adsorbent under an atmosphere of 5% H(2) in N(2) at 450 degrees C was found to provide an effective means of restoring the adsorption capacity over two cycles of adsorption and regeneration, although after three such cycles, adsorption capacity decreased. (C) 2008 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据