Steam reforming of model gasification tar compounds over nickel catalysts prepared from hydrotalcite precursors
Steam reforming of model gasification tar compounds over nickel catalysts prepared from hydrotalcite precursors
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DOI：
10.1016/j.fuproc.2014.01.007
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发表时间：
2014-05
影响因子：
7.5
通讯作者：
Fernanda M. Josuinkas;C. B. Quitete;N. F. Ribeiro;M. M. Souza-M.
中科院分区：
文献类型：
--
作者：
Fernanda M. Josuinkas;C. B. Quitete;N. F. Ribeiro;M. M. Souza-M.
衍生自类水滑石化合物的镍催化剂，具有10和20重量% NiO负载，制备和测试在不同的焦油模型化合物：苯，甲苯和萘的水蒸气重整。在甲苯溶液中使用萘。使用1.5的蒸汽/碳比，根据随温度的活性和随时间的失活来评价催化剂。催化剂表现出类似的行为，在苯和甲苯重整中，具有10% NiO的催化剂的转化率略高。H2的生成量远低于热力学预测值，低温时主要生成CO2，高温时主要生成CO。萘的转化要困难得多，并抑制甲苯重整。两种催化剂均显示出随运行时间的良好稳定性，尽管存在大量的碳存款和Ni烧结。焦炭的数量和形态取决于芳烃化合物的性质。
Nickel catalysts derived from hydrotalcite-like compounds, with 10 and 20 wt.% NiO loading, were prepared and tested in steam reforming of different tar model compounds: benzene, toluene and naphthalene. Naphthalene was used in toluene solution. The catalysts were evaluated in terms of activity with temperature and deactivation with time, using a steam/carbon ratio of 1.5. The catalysts presented similar behavior, with slightly higher conversions for the catalyst with 10% NiO in benzene and toluene reforming. H2formation was much lower than that predicted by thermodynamics, with CO2as the main product at low temperatures and CO at high temperatures. Naphthalene is much more difficult to be converted, and inhibits the toluene reforming. Both catalysts showed good stability with time on stream despite the high amount of carbon deposit and Ni sintering. The amount and morphology of the coke are dependent on the nature of aromatic compound.