Mixtures of potassium sulphate and iron sulphate as catalysts for water vapour gasification of carbon. 2. Wettability phenomena and reactions of the catalyst precursors
Mixtures of potassium sulphate and iron sulphate as catalysts for water vapour gasification of carbon. 2. Wettability phenomena and reactions of the catalyst precursors
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DOI：
10.1016/0016-2361(84)90345-4
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发表时间：
1984-10
期刊：
影响因子：
7.4
通讯作者：
J. Adler;K. J. Hüttinger;R. Minges
中科院分区：
文献类型：
--
作者：
J. Adler;K. J. Hüttinger;R. Minges
通过测量细粒石墨在不同温度下的润湿性、对该材料的渗透以及在H2H2O混合物中金属的分布，研究了在水蒸气气化过程中表现出优异催化活性的混合催化剂（feso4与K2SO4， Fe/K质量比为1:5）与碳之间的相互作用。通过测量相对质量损失，对分解和转化反应进行了分析。结果发现，催化剂混合物在650℃时形成熔融相，而纯硫酸盐仍以粉末形式存在。在700℃下处理2小时后，渗透完成。EPMA研究表明，铁和钾在石墨衬底中分布均匀。对于纯硫酸盐，同样的处理不会引起明显的变化。相对质量损失表明熔体可能由FeS、FeO、K2S和KOH组成。假设k2so4转化为K2S甚至KOH可能受到FeS、FeO或可能的Fe的催化影响。进一步的研究需要分析催化剂的活性状态，特别是Fe和K的相互催化活性。
The interaction between carbon and a mixed catalyst (FeSO4with K2SO4, Fe/K mass ratio 1:5), which showed a superior catalytic activity in water vapour gasification of carbon, was studied by measuring the wettability of a fine-grained graphite, penetration into this material and the metal distribution after treatments in H2H2O mixtures at various temperatures. The decomposition and conversion reactions were analysed by measuring the relative mass losses. It was found that the catalyst mixture forms a melt phase by 650 °C, whereas the pure sulphates are still present as powders. Penetration is complete after 2 h treatment at 700 °C. EPMA studies show a homogeneous distribution of Fe and K in the graphite substrate. The same treatment causes no significant change with the pure sulphates. The relative mass losses suggest that the melt may be composed of FeS, FeO, K2S and KOH. It is assumed that the conversion of K2SO4to K2S or even KOH may be catalytically influenced by FeS, FeO or possibly Fe. Further studies are necessary to analyse the active state of the catalyst and especially the mutual catalytic activity of Fe and K.