Catalytic reforming of tar during gasification. Part V. Decomposition of NO_x precursors on the char-supported iron catalyst

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• 作者：Zhenhua Min ; Jian-Ying Lin ; Piyachat Yimsiri ; Mohammad Asadullah ; Chun-Zhu Li
• 关键词：Char-supported iron catalyst ; NOx precursors decomposition ; Steam reforming ; Hot gas cleaning
• 刊名：Fuel
• 出版年：15 January, 2014
• 年：2014
• 卷：116
• 期：Complete
• 页码：19-24
• 全文大小：526 K

文摘

A char-supported iron catalyst was investigated as a catalyst for destructing the NO_x precursors (e.g. HCN and NH₃) during the catalytic steam reforming of tar derived from the pyrolysis of mallee bark and leaf. It was found that the H-form char as a catalyst exhibited little activity for destructing NO_x precursors even at high temperature, while on the contrary NO_x precursors were decomposed efficiently on the char-supported iron catalyst during the steam reforming process. The activities of the char-supported iron catalyst for decomposing NO_x precursors were indifferent for the gasification of bark and leaf. More importantly, the hydrolysis of HCN and the decomposition of NH₃ are consecutive reactions during the catalytic steam reforming of biomass tar/volatiles. A majority of HCN was hydrolysed and converted to NH₃ on the char-supported iron catalyst, where NH₃ can be further decomposed to N₂ when it has enough contact time with the catalyst during the steam reforming process.