Combustion of non-halogenated volatile organic compounds over group VIII metal catalysts
Combustion of non-halogenated volatile organic compounds over group VIII metal catalysts
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DOI：
10.1016/s0926-3373(96)00103-8
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发表时间：
1997-11
影响因子：
22.1
通讯作者：
Panagiotis Papaefthimiou;T. Ioannides;X. Verykios
中科院分区：
文献类型：
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作者：
Panagiotis Papaefthimiou;T. Ioannides;X. Verykios
挥发性有机化合物（VOC）以低浓度（10-1000 ppm）存在于工业流出物流中，其催化燃烧是一种有前途的空气减排技术。研究了苯、丁醇和乙酸乙酯在氧化铝载体上的催化氧化反应。Pt、Pd和Co被认为是第VIII族金属中最活跃的，而乙酸乙酯被认为是最难氧化的化合物。苯和乙酸乙酯在Pt Al 2 O3上的氧化被发现是结构敏感反应，转换频率（TOF）随着平均金属颗粒尺寸的增加而增加。催化剂表面上的氯化物的存在下，源自含氯化物的金属前体化合物被发现施加抑制作用的活性的Pt。在Pt和Pd催化剂上的反应的表观活化能被发现是在70-120 kJ/mol的范围内，而在所有情况下，相对于VOC的反应顺序是积极的。在苯-丁醇混合物的氧化过程中，只要丁醇存在于反应混合物中，苯的氧化就被完全抑制。
Catalytic combustion of volatile organic compounds (VOCs), present in low concentrations (10–1000 ppm) in industrial effluent streams, is a promising air abatement technology. The oxidation of benzene, butanol and ethyl acetate over group VII metal catalysts supported on alumina carriers has been investigated. Pt, Pd and Co were found to be the most active among group VIII metals, while ethyl acetate was found to be the most-difficult-to-oxidize compound. Benzene and ethyl acetate oxidations over Pt Al2O3were found to be structure sensitive reactions with the turnover frequency (TOF) increasing with increasing mean metal particle size. The presence of chloride on the catalyst surface, originating from chloride-containing metal precursor compounds was found to exert an inhibiting effect on the activity of Pt. Apparent activation energies of the reactions over Pt and Pd catalysts were found to be in the 70–120 kJ/mol range while the reaction order with respect to the VOC was positive in all cases. During oxidation of benzene-butanol mixtures, benzene oxidation was completely suppressed as long as butanol was present in the reaction mixture.