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论文类型：期刊论文

发表时间：2008-05-01

发表刊物：CHEMICAL ENGINEERING JOURNAL

收录刊物：SCIE、EI

卷号：138

期号：1-3

页面范围：155-165

ISSN号：1385-8947

关键字：metal sludge; pyrolysis; porosity; surface chemistry; catalytic activity

摘要：New materials were prepared by pyrolysis of metal sludge from galvanization industry saturated with spent mineral oil. To evaluate the changes in the structural and chemical properties, the pyrolysis time and temperature varied. The materials were characterized using adsorption of nitrogen, FTIR, XRD, XRF, ICP, SEM and thermal analysis. Their catalytic activity was tested in the removal of hydrogen sulfide from simulated mixture of digester gas. The results indicated that a new carbon phase from the oil precursor not only provided microporosity but also contributed to the changes in surface chemistry of the materials, which are favorable for hydrogen sulfide oxidation to elemental sulfur. Based on surface chemistry analyses the catalytic centers consist of nitrogen-containing catalytic carbon and/or spinel-like structures containing iron, zinc and nickel. Longer carbonization time and higher temperature besides bringing more stability to the carbon phase via increasing its degree of aromatization and via rearrangement in nitrogen chemistry also impose favorable changes in an inorganic phase via solid-state reactions. (C) 2007 Elsevier B.V. All rights reserved.