Influence of the addition of promoters to steam reforming catalysts

被引：127
作者：
Lisboa, JD
Santos, DCRM
Passos, FB
Noronha, FB
机构：
[1] Univ Fed Fluminense, Dept Engn Quim, BR-24210240 Niteroi, RJ, Brazil
[2] Inst Nacl Tecnol, BR-20084310 Rio De Janeiro, Brazil
来源：
CATALYSIS TODAY | 2005年 / 101卷 / 01期
关键词：
steam reforming; promoters; Ni; synthesis gas;
D O I：
10.1016/j.cattod.2004.12.005
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The steam reforming of hydrocarbons may be catalyzed by several transition metals. The most frequently used catalysts are alpha-Al2O3 supported nickel-based catalysts, which are frequently modified by the addition of promoters such as Mg and Ca, in order to improve their stability and selectivity. The mechanism of promotion was investigated using temperature programmed surface reaction (TPSR), diffuse reflectance UV-vis spectroscopy (DRS) and temperature-programmed oxidation. The DRS spectra showed bands characteristic to NiO with Al3+ and NiO with less interaction with the support. Temperature programmed surface reaction results showed that there is an increase in the reforming activity by the presence of the promoters, without modification in the mechanism of reaction. The TPO results showed that the addition of promoters caused an increase on the hydrogen content of the coke formed. (c) 2005 Elsevier B.V. All rights reserved.
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页码：15 / 21
页数：7
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