Selective catalytic oxidation of ammonia over LaMAl11O19-delta (M = Fe, Cu, Co, and Mn) hexaaluminates catalysts at high temperatures in the Claus process

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Selective catalytic oxidation of ammonia over LaMAl11O19-delta (M = Fe, Cu, Co, and Mn) hexaaluminates catalysts at high temperatures in the Claus process

机译：的选择性催化氧化氨LaMAl11O19-delta (M =铁、铜、Co和Mn)hexaaluminates催化剂在高温下老人的过程

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A method for the selective catalytic oxidation of ammonia at high temperature was innovatively proposed to substitute the traditional combustion method to remove the ammonia impurity in the Claus process. In the present work, transition metal (Fe, Cu Co, and Mn)-substituted La-hexaaluminate catalysts were synthesized and investigated for the selective catalytic oxidation of ammonia (NH3-SCO) at high temperature. It was observed that Cu-substituted catalysts could achieve the highest N-2 yield at around 520 degrees C. It was confirmed that the conversion of NH3 was closely related to the reducibility of the prepared catalyst. In particular, it was observed that the molecular O-2 could not be dissociatively adsorbed on the prepared catalyst surface. However, both lattice oxygen and gas-phase O-2 could participate in NH3-SCO, with gas-phase O-2 being the most favorable under the experimental conditions. It was evidenced that the NH3-SCO reaction over the prepared catalysts followed the i-SCR mechanism. Moreover, monodentate nitrates were the main reactive intermediates toward forming N-2. Therefore, the development of high-temperature SCO technology and an efficient catalyst are beneficial for the sustainable development of the chemical industry.

机译：方法的选择性催化氧化氨在高温下是创新提出了替代传统的燃烧方法去除氨的杂质老人的过程。金属(铁、铜和锰)取代La-hexaaluminate催化剂合成和选择性催化研究氨氧化(NH3-SCO)高温度。催化剂可以实现n -产量最高大约520度c,这是证实NH3的转换密切相关法制备的催化剂的还原性。是观察到的分子0 2不能解离吸附的制备催化剂的表面。氧、气相-可以参与NH3-SCO,气相-是最多的良好的实验条件。是证明NH3-SCO反应了准备催化剂后i-SCR机制。此外,monodentate硝酸盐是主要的活性中间体形成n - 2。因此,高温的发展上海合作组织技术和高效的催化剂有利于可持续发展的化学工业。

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《Catalysis science & technology》 |2020年第5期|1477-1491|共15页
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正文语种英语
中图分类汉语教学;
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CATALYTIC OXIDATION; combustion method; Catalystshigh temperaturemanganeseCLAUS PROCESSammonia;

机译：燃烧催化氧化;方法;Catalystshigh temperaturemanganeseCLAUSPROCESSammonia;

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Selective catalytic oxidation of ammonia over LaMAl11O19-delta (M = Fe, Cu, Co, and Mn) hexaaluminates catalysts at high temperatures in the Claus process

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