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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Synthesis, characterization and performance of CuO/La2O3 composite catalyst for ammonia catalytic oxidation
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Synthesis, characterization and performance of CuO/La2O3 composite catalyst for ammonia catalytic oxidation

机译：氨催化氧化CuO / La2O3复合催化剂的合成，表征与性能

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摘要

This work considers the oxidation of ammonia (NH3) by selective catalytic oxidation (SCO) over a CuO/La2O3 composite catalyst at temperatures between 150 and 400 °C. A CuO/La2O3 composite catalyst was prepared by co-precipitation of copper nitrate and lanthanum nitrate at various molar concentrations. This study also considers how the concentration of influent NH3 (C_0 = 1000 ppm), the space velocity (GHSV=92,000 l/h), the relative humidity (RH = 12%) and the concentration of oxygen (O2=4%) affect the operational stability and the capacity for removing NH3. The catalysts that were characterized using FTIR, XRD, UV-Vis, BET and PSA, have shown that the catalytic behavior is related to the copper (II) oxide, while lanthanum (III) oxide may serve only to provide active sites for the reaction during a catalyzed oxidation run. The experimental results show that the extent of conversion of ammonia by SCO in the presence of the CuO/La2O3 composite catalyst was a function of the molar ratio. The ammonia was removed by oxidation in the absence of CuO/ La2O3 composite catalyst, and around 93.0% NH3 reduction was achieved during catalytic oxidation over the CuO/La2O3 (8:2, molar/molar) catalyst at 400 °C with an oxygen content of 4.0%. Moreover, the effect of the reaction temperature on the removal of NH3 in the gaseous phase was also monitored at a gas hourly space velocity of under 92,000 h~(-1).
机译：这项工作考虑了在150和400°C之间的温度下，在CuO / La2O3复合催化剂上通过选择性催化氧化（SCO）来氧化氨（NH3）。通过在不同摩尔浓度下共沉淀硝酸铜和硝酸镧来制备CuO / La2O3复合催化剂。这项研究还考虑了进水NH3（C_0 = 1000 ppm），空速（GHSV = 92,000 l / h），相对湿度（RH = 12％）和氧气浓度（O2 = 4％）的影响运行稳定性和脱硝能力。使用FTIR，XRD，UV-Vis，BET和PSA表征的催化剂表明，催化行为与氧化铜（II）有关，而氧化镧（III）只能用于提供反应的活性位点在催化氧化过程中。实验结果表明，在CuO / La2O3复合催化剂存在下，SCO对氨的转化程度是摩尔比的函数。在不存在CuO / La2O3复合催化剂的情况下，通过氧化除去氨，在含氧量为400°C的CuO / La2O3（8：2，摩尔/摩尔）催化剂上进行催化氧化时，NH3的还原率约为93.0％为4.0％。此外，还以低于92,000h·（-1）的气时空速监测了反应温度对气相中NH 3去除的影响。

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