Synthesis of MnNi-SAPO-34 by a one-pot hydrothermal method and its excellent performance for the selective catalytic reduction of NO by NH3

Li Rui; Li Zhibin; Chen LiqiangDong YongliMa ShiboYuan FulongZhu Yujun

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Synthesis of MnNi-SAPO-34 by a one-pot hydrothermal method and its excellent performance for the selective catalytic reduction of NO by NH3

机译：合成MnNi-SAPO-34锅水热方法及其性能优良选择性催化还原的没有氨

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Mn-or/and Ni-modified SAPO-34 molecular sieves (Mn-SAPO-34, Ni-SAPO-34, and MnNi-SAPO-34) were synthesized by a one-pot hydrothermal synthesis method using morpholine as a structure directing agent. XRD, XRF, SEM, TEM-EDX, UV-vis-DRS, NH3-TPD, XPS, NMR, and in situ DRIFTS analyses were performed to study the properties of the samples. The MnNi-SAPO-34 catalyst demonstrated much better NOx conversion (> 95%) and N-2 selectivity (> 98%) for the selective catalytic reduction (SCR) of NOx by NH3 than those of the other catalysts from 320 degrees C to 470 degrees C. Moreover, NOx conversion could still be maintained at about 100% at 380 degrees C even after 80 h over MnNi-SAPO-34. Its excellent activity can be ascribed to the strong interaction between the Mn and Ni species in the framework of MnNi-SAPO-34, leading to the suitable redox ability of MnNi-SAPO-34 by the reaction Ni3+ + Mn3+ Ni2+ + Mn4+. The in situ DRIFTS results suggested that the NH3-SCR reaction was mainly performed by an Eley-Rideal (E-R) reaction pathway at 300 degrees C for the MnNi-SAPO-34 catalyst. Thus, MnNi-SAPO-34 is considered as a promising candidate for controlling NOx emissions at middle temperatures.

机译：Mn-or / Ni-modified SAPO-34分子筛(Mn-SAPO-34 Ni-SAPO-34,和MnNi-SAPO-34)是合成了一锅法水热合成方法使用吗啉作为结构指导代理。NH3-TPD、XPS、NMR和原位漫反射红外光谱分析进行研究的属性样本。更好的氮氧化物转换(> 95%)和n - 2选择性催化的选择性(> 98%)(SCR)减少氮氧化物的NH3比其他催化剂从320度到470度c .此外,氮氧化物转换仍有可能在380摄氏度甚至保持在约100%后在MnNi-SAPO-34 80 h。活动可以归因于强劲锰和镍物种间相互作用MnNi-SAPO-34框架,导致MnNi-SAPO-34的合适的氧化还原能力反应Ni3 + Mn3 + Ni2 + Mn4 +。结果表明,NH3-SCR反应主要是由一个Eley-Rideal(e - r)在300摄氏度反应途径MnNi-SAPO-34催化剂。作为一个有前途的候选人在中间温度下控制氮氧化物的排放。

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来源
《Catalysis science & technology》 |2017年第21期|4984-4995|共12页
作者
Li Rui; Li Zhibin; Chen LiqiangDong YongliMa ShiboYuan FulongZhu Yujun;
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作者单位

Heilongjiang Univ, Sch Chem & Mat, Key Lab Funct Inorgan Mat Chem, Minist Educ, Harbin 150080, Heilongjiang, Peoples R China;

Heilongjiang Univ Sci & Technol, Coll Environm & Chem Engn, Harbin 150022, Heilongjiang, Peoples R China;

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正文语种英语
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strong interaction; water calorimetry; Selective catalytic reduction (SCR)MorpholinesCatalystssynthesisammoniaNOBELIUM;

机译：强相互作用,水的量热法;选择性催化还原(SCR) MorpholinesCatalystssynthesisammoniaNOBELIUM;

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Synthesis of MnNi-SAPO-34 by a one-pot hydrothermal method and its excellent performance for the selective catalytic reduction of NO by NH3

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