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论文类型：期刊论文

发表时间：2008-02-15

发表刊物：APPLIED SURFACE SCIENCE

收录刊物：SCIE、EI

卷号：254

期号：8

页面范围：2385-2395

ISSN号：0169-4332

关键字：sewage sludge; waste oil; pyrolysis; porosity; surface chemistry; catalytic activity

摘要：Desulfurization adsorbents for purification of digester gas were prepared by pyrolysis of sewage sludge impregnated 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, 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 the importance of new carbon phase from the oil precursor. It provided mesoporosity, which increased the dispersion of catalytic phase and space for storage of surface reaction products. The results indicated that the adsorbents obtained at 950 degrees C are much more active in the process of hydrogen sulfide oxidation than those obtained at 650 degrees C. Moreover, longer heat treatment is also beneficial for the development of surface catalytic properties. Extensive pyrolysis stabilizes carbon phase via increasing its degree of aromatization and provides activation agents for this phase coming from decomposition and rearrangement of inorganic phase. (c) 2007 Elsevier B. V. All rights reserved.