Steam reforming of different biomass tar model compounds over Ni/Al2O3 catalysts
Steam reforming of different biomass tar model compounds over Ni/Al2O3 catalysts
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DOI：
10.1016/j.enconman.2016.12.092
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发表时间：
2017-03-15
影响因子：
10.4
通讯作者：
Williams, Paul T.
中科院分区：
文献类型：
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作者：
Artetxe, Maite;Alvarez, Jon;Williams, Paul T.
本工作的重点是在Ni/Al 2 O3催化剂上通过催化水蒸气重整去除生物质气化产生的焦油。将不同的焦油模型化合物（苯酚、甲苯、甲基萘、茚、苯甲醚和糠醛）单独地蒸汽重整（在将每一种溶解在甲醇中之后），以及它们所有的混合物，在700 ℃下在3的蒸汽/碳（SIC）比和60分钟的运行中。苯甲醚和糠醛的转化率和H-2电位最高，而甲基萘的反应活性最低。然而，与芳烃相比，含氧化合物的更高反应性预示着催化剂上的碳沉积（在1.5- 2.8wt%范围）。当原料中甲醇的浓度降低而甲苯或苯甲醚的浓度增加时，在气态产物中有利于CO的选择性，从而增加催化剂上的焦炭沉积并降低用于蒸汽重整反应的催化剂活性。此外，在催化剂中的Ni负载量从5%增加到20%，增强了在所研究的所有模型化合物的混合物的蒸汽重整中的碳转化率和H2形成，但是这些值对于40%的Ni含量降低。焦炭的形成也增加了镍负载，达到其最大值为40%镍（6.5重量%）。(C)2017爱思唯尔有限公司版权所有
This work focuses on the removal of the tar derived from biomass gasification by catalytic steam reforming on Ni/Al2O3 catalysts. Different tar model compounds (phenol, toluene, methyl naphthalene, indene, anisole and furfural) were individually steam reformed (after dissolving each one in methanol), as well as a mixture of all of them, at 700 degrees C under a steam/carbon (SIC) ratio of 3 and 60 min on stream. The highest conversions and H-2 potential were attained for anisole and furfural, while methyl naphthalene presented the lowest reactivity. Nevertheless, the higher reactivity of oxygenates compared to aromatic hydrocarbons profnoted carbon deposition on the catalyst (in the 1.5-2.8 wt.% range). When the concentration of methanol is decreased in the feedstock and that of toluene or anisole is increased, the selectivity to CO is favoured in the gaseous products, thus increasing coke deposition on the catalyst and decreasing catalyst activity for the steam reforming reaction. Moreover, an increase in Ni loading in the catalyst from 5 to 20% enhances carbon conversion and H2 formation in the steam reforming of a mixture of all the model compounds studied, but these values decrease for a Ni content of 40%. Coke formation also increased by increasing Ni loading, attaining its maximum value for 40% Ni (6.5 wt.%). (C) 2017 Elsevier Ltd. All rights reserved.