A novel nickel/carbon catalyst for CH4 and H2 production from organic compounds dissolved in wastewater by catalytic hydrothermal gasification
A novel nickel/carbon catalyst for CH4 and H2 production from organic compounds dissolved in wastewater by catalytic hydrothermal gasification
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DOI：
10.1016/j.fuel.2005.04.035
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发表时间：
2006
期刊：
影响因子：
7.4
通讯作者：
A. Sharma;H. Nakagawa;K. Miura
中科院分区：
文献类型：
--
作者：
A. Sharma;H. Nakagawa;K. Miura
采用自行研制的新型Ni/C催化剂，对TOC浓度为0.2%~2%的废水中的有机物进行气化处理。这个过程通过将有机化合物气化成甲烷和氢气等高热量气体来去除有机化合物。考察了Ni/C催化剂的碳转化率、有机大分子转化率和烧结型催化剂的失活情况。初步结果表明，在360℃、20 Mpa条件下，碳转化率可达99%。提出了一种转化机理：首先在金属表面将大分子分解成小分子，小分子水蒸气气化生成CO和H_2，然后CO甲烷化和CO变换反应生成CH_4和CO_2。结果表明，该催化剂活性高、稳定性好，反应100h后仍未观察到结块现象。
A novel Ni/carbon catalyst recently developed by the authors was used to gasify organic compounds dissolved in the wastewater with TOC concentration from 0.2 to 2%. The process removes the organic compounds by gasifying them into high calorific gases like methane and hydrogen. The investigations were focused on the efficiency of the Ni/carbon catalyst in terms of carbon conversion, conversion of big organic molecules, and catalyst deactivation due to sintering. The preliminary results showed that up to 99% carbon conversion can be achieved at 360°C, and 20MPa. A conversion mechanism was suggested which consists of: first, decomposition of big molecules to small molecules on the metal surface, steam gasification of small molecules to produce CO and H2followed by CO methanation and CO shift reaction to produce CH4and CO2. The catalyst was found to be highly active and stable and no sintering was observed even after 100h of reaction time.