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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >Studies in wet air oxidation of aqueous morpholine over Ru/TiO2 catalyst: an insight into the fate of the 'N' atom
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Studies in wet air oxidation of aqueous morpholine over Ru/TiO2 catalyst: an insight into the fate of the 'N' atom

机译：Ru / TiO2催化剂在湿空气中氧化吗啉的研究：洞悉“ N”原子的命运

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BACKGROUND: Wet air oxidation (WAO) is a very attractive process for the treatment of aqueous streams containing amino compounds. During WAO, it is important to ensure that the 'N' atom in various 'N' bearing organic compounds is converted into N-2. Morpholine is selected as model pollutant for the present study. In order to reduce the severity of operating conditions and to maximize N2 formation, the suitability of a heterogeneous catalyst namely 5% (w/w) Ru/TiO2, was studied. RESULTS: The studies were carried out at a morpholine concentration of 500 mg L-1. Among the various catalysts studied 5% (w/w) Ru/TiO2 was found to be an effective catalyst. The selectivity towards N2 varied between 47 and 56% in the temperature range 473-483K at 0.66kg m(-3) catalyst loading and 0.69 MPa oxygen partial pressure. Below 473 K more NH4+ ions were formed and at higher temperatures (>483 K) more NO3- ions were generated. It was also observed that under the influence of diffusional resistance, selectivity towards N2 formation was enhanced considerably (80%) when compared with the kinetically controlled regime at 483 K. The experimental data can be well correlated by assuming dissociative adsorption of oxygen followed by surface reaction. CONCLUSIONS: The heterogeneous catalyst S% (w/w) Ru/TiO2 was found to be very effective in the complete (100%) degradation of morpholine. The highest selectivity for conversion of -NH- group in morpholine to N-2 gas was obtained at 483 K. Under a partial mass transfer controlled regime, selectivity towards N-2 formation was enhanced considerably relative to the kinetically controlled regime. (C) 2008 Society of Chemical Industry.
机译：背景：湿空气氧化（WAO）是一种非常有吸引力的工艺，用于处理含氨基化合物的水流。在WAO期间，重要的是要确保各种带有“ N”的有机化合物中的“ N”原子都转化为N-2。选择吗啉作为本研究的模型污染物。为了降低操作条件的严重性并最大程度地增加N2的形成，研究了非均相催化剂（5％（w / w）Ru / TiO2）的适用性。结果：研究在吗啉浓度为500 mg L-1的条件下进行。在研究的各种催化剂中，发现5％（w / w）的Ru / TiO2是有效的催化剂。在催化剂负载为0.66kg m（-3）和氧气分压为0.69 MPa时，在473-483K温度范围内，对N2的选择性在47％至56％之间变化。低于473 K，会生成更多的NH4 +离子，而在较高的温度（> 483 K）下，会生成更多的NO3-离子。还观察到，在扩散阻力的影响下，与动力学控制方案在483 K下相比，对N2形成的选择性大大提高了（80％）。通过假设氧的解离吸附和表面吸附可以很好地关联实验数据。反应。结论：发现非均相催化剂S％（w / w）Ru / TiO2对吗啉的完全（100％）降解非常有效。在483 K处获得了将吗啉中的-NH-基团转化为N-2气体的最高选择性。在部分传质控制方案下，相对于动力学控制方案，对N-2形成的选择性大大提高。 （C）2008年化学工业协会。

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