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The promotion effect of manganese on Cu/SAPO for selective catalytic reduction of NOx with NH3

机译：用NH3选择锰对Cu / Sapo选择性催化还原NOx的推广作用

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摘要

The activity and hydrothermal stability of Cu/SAPO and xMn-2Cu/SAPO for low-temperature selective catalytic reduction of NOx with ammonia were investigated. An ion-exchanged method was employed to synthesize xMn-2Cu/SAPO, which was characterized by N-2 adsorption, ICP-AES, X-ray diffraction (XRD), NH3-temperature programmed desorption (NH3-TPD), NO oxidation, X-ray photoelectron spectrum (XPS), UV-vis, H-2-temperature programmed reduction (H-2-TPR) and diffuse reflectance infrared Fourier transform spectra (DRIFTS). 2Mn-2Cu/SAPO and 4Mn-2Cu/SAPO showed the best SCR activity, in that at 150 degrees C NO conversion reached 76% and N-2 selectivity was above 95% for the samples. NO oxidation results showed that the 2Mn-2Cu/SAPO had the best NO oxidation activity and the BET surface area decreased as manganese loading increased. XRD results showed that the metal species was well dispersed. NH3-TPD showed that the acid sites have no significant influence on the SCR activity of xMn-2Cu/SAPO. H-2-TPR patterns showed good redox capacity for xMn-2Cu/SAPO. UV-vis and H-2-TPR showed that the ratio of Mn4+ to Mn3+ increased as manganese loading increased. XPS spectra showed a significant amount of Mn3+ and Mn4+ species on the surface and addition of manganese increased the ratio of Cu2+. The promotion effect of manganese to 2Cu/SAPO comes from the generation of Mn3+ and Mn4+ species. Deduced from the DRIFTS spectra, the Elay-Rideal mechanism was effective on 4Mn-2Cu/SAPO.
机译：研究了Cu / Sapo和XMN-2Cu / SAPO用于低温选择性催化用氨的低温选择性催化还原的活性和水热稳定性。采用离子交换方法合成XMN-2CU / SAPO，其特征在于N-2吸附，ICP-AES，X射线衍射（XRD），NH3温度编程解吸（NH3-TPD），无氧化， X射线光电子体光谱（XPS），UV-Vis，H-2温控制减少（H-2-TPR）和漫反射红外傅里叶变换谱（漂移）。 2MN-2CU / SAPO和4MN-2CU / SAPO显示了最佳的SCR活动，因为在150摄氏度下，达到76％的转化率达到76％，并且N-2选择性高于95％的样品。 NO氧化结果表明，2MN-2CU / SAPO具有最好的NO氧化活性和BET表面积减少锰负载增大。 XRD结果表明，金属物种良好分散。 NH3-TPD表明，酸性位点对XMN-2CU / SAPO的SCR活性没有显着影响。 H-2-TPR模式显示XMN-2CU / SAPO的良好氧化还原容量。 uV-Vis和H-2-TPR显示，随着锰负载的增加，Mn4 +至Mn3 +的比例增加。 XPS光谱显示出大量的MN3 +和MN4 +物种在表面上并加入锰增加了Cu2 +的比例。锰对2CU / SAPO的促进效果来自MN3 +和MN4 +物种的产生。从漂移光谱中推断，Elay-rideal机制在4Mn-2Cu / Sapo上有效。

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  • 来源
    《RSC Advances》 |2018年第11期|共10页
  • 作者

    Pang Chengkai; Zhuo Yuqun; Weng Qiyu; Zhu Zhenwu;

  • 作者单位

    Tsinghua Univ Beijing Engn Res Ctr Ecol Restorat &

    Carbon Fixat Dept Thermal Engn Key Lab Thermal Sci &

    Power Engn Minist Educ Beijing 100084 Peoples R China;

    Tsinghua Univ Beijing Engn Res Ctr Ecol Restorat &

    Carbon Fixat Dept Thermal Engn Key Lab Thermal Sci &

    Power Engn Minist Educ Beijing 100084 Peoples R China;

    Tsinghua Univ Beijing Engn Res Ctr Ecol Restorat &

    Carbon Fixat Dept Thermal Engn Key Lab Thermal Sci &

    Power Engn Minist Educ Beijing 100084 Peoples R China;

    Tsinghua Univ Beijing Engn Res Ctr Ecol Restorat &

    Carbon Fixat Dept Thermal Engn Key Lab Thermal Sci &

    Power Engn Minist Educ Beijing 100084 Peoples R China;

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