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作 者:谭潇 齐随涛 周一鸣 石利斌 程光旭 伊春海 杨伯伦 TAN Xiao;QI Suitao;ZHOU Yiming;SHI Libin;CHENG Guangxu;YI Chunhai;YANG Bolun(Shaanxi Key Laboratory of Energy and Chemical Process Intensification,School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)
机构地区:[1]西安交通大学化学工程与技术学院,陕西省能源化工过程强化重点实验室,陕西西安710049
出 处:《化工进展》2022年第11期5850-5857,共8页Chemical Industry and Engineering Progress
基 金:国家自然科学基金(20338011);陕西省自然科学基金(2020JM-061);陕煤科学技术研究院横向项目(20210643);校企协同创新基金。
摘 要:传统氨选择性催化还原(NH-SCR)法在大气污染物NO的脱除中得到广泛应用,但仍存在催化剂有毒、操作温度高及氨逃逸等缺点,不能满足日益增多的低温应用场景和更高的环保要求。本文采用浸渍法制备了SBA-15分子筛负载的锰铁双金属催化剂,研究了非热等离子体协同催化剂低温下直接催化还原NO的性能。活性测试结果表明,室温下等离子体输出电压为12k V时,等离子体协同催化的NO转化率达到97.8%。表征结果显示等离子体协同反应前后催化剂的孔道结构和物理形貌未见明显变化。在线质谱分析结果表明,等离子体协同催化作用下,NO被直接分解为N_(2)和O_(2)。由机理分析可知,不同价态Mn物种间的电子传递削弱了催化剂表面吸附态NO分子中N—O键,使得等离子体分解NO的能耗下降。Although the traditional ammonia selective catalytic reduction (NH-SCR) has been widely used in the removal of atmospheric pollutant NO,there are still some flaws such as catalyst toxicity,high and narrow operating temperature,and ammonia emission.Herein,the manganese-iron bimetallic catalyst supported on SBA-15 molecular sieve was prepared by the impregnation method,and the performance of the manganese-iron catalyst to directly decompose NO under non-thermal plasma at low temperature was investigated.The activity test results showed that the NO conversion reached 97.8%when the plasma output voltage was 12kV at room temperature.The characterization results showed that the pore structure and physical morphology of the catalyst did not change significantly after the reaction.The online mass spectrometry analysis results showed that under the synergistic catalysis of plasma,NO was directly decomposed into N_(2)andO_(2).The mechanism analysis showed that the electron transfer between different valence Mn species weakened the N-O bond of the NO adsorbed on catalyst surface,and the energy consumption of the plasma to decompose NO was also reduced.
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