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New Insight into the Effects of NH3 on SO2 Poisoning for In Situ Removal of Metal Sulfates in Low-Temperature NH3-SCR over an Fe–V Catalyst
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-09-04 , DOI: 10.1021/acs.jpcc.0c04902 Jincheng Mu 1 , Xinyong Li 1, 2 , Xinyang Wang 1 , Shiying Fan 1 , Zhifan Yin 1 , Zeyu Li 1 , Moses O. Tadé 2 , Shaomin Liu 2
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-09-04 , DOI: 10.1021/acs.jpcc.0c04902 Jincheng Mu 1 , Xinyong Li 1, 2 , Xinyang Wang 1 , Shiying Fan 1 , Zhifan Yin 1 , Zeyu Li 1 , Moses O. Tadé 2 , Shaomin Liu 2
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SO2 poisoning is a significant challenge for low-temperature selective catalytic reduction of NOx with NH3. Fundamental understanding of such sulfation effects on the catalyst is an essential step for finding strategies to overcome the issue. Here, the effect of NH3 on the temperature-driven sulfation process is systematically investigated over an Fe–V catalyst composed of α-Fe2O3 and FeVO4. When poisoning occurred by SO2 + O2, the highly dispersed and thermally stable Fe2(SO4)3 species would be formed on the catalyst surface. Such poisoning was getting worse with the increase of sulfation temperature, inducing the continuous lowering of redox properties, NOx activation ability, and thereby the low-temperature catalytic performance. With introduction of NH3, additional ammonium sulfates species were simultaneously generated at lower temperatures (<250 °C), covering the surface reaction sites and thus aggravating the decline of low-temperature activities. Whereas the formation of Fe2(SO4)3 species would be dramatically suppressed at higher sulfation temperatures (≥250 °C), it reduces the poisoning effects that occur at low reaction temperatures. The sulfated catalyst with the stable Fe2(SO4)3 species can be in situ regenerated through NH3 reduction followed by thermal treatment. Remarkably, compared with the fresh catalyst, the regenerated catalyst exhibited equivalent surface/redox properties and the consequent catalytic performance.
中文翻译：
新洞察NH的影响3上SO 2中毒在低温NH金属硫酸盐的原位去除3 -SCR过一种Fe-V催化剂
SO 2中毒是用于低温选择性催化还原NO的一个显著挑战X与NH 3。对这类硫酸化作用对催化剂的基本了解是寻找克服该问题的策略的重要步骤。在此，NH的效果3上的温度驱动硫酸盐化方法被系统地研究过的α-Fe组成的铁-V催化剂2 ö 3和FeVO 4。当SO 2 + O 2引起中毒时，高度分散且热稳定的Fe 2（SO 4）3会在催化剂表面上形成杂质。随着硫酸化温度的升高，这种中毒变得越来越严重，导致氧化还原性能，NO x活化能力的持续降低，进而导致低温催化性能的降低。随着NH 3的引入，在较低的温度（<250°C）下同时生成了额外的硫酸铵类物质，覆盖了表面反应位点，从而加剧了低温活性的下降。而Fe 2（SO 4）3的形成在较高的硫酸化温度（≥250°C）下会显着抑制该物种，它降低了在低反应温度下发生的中毒效应。具有稳定的Fe 2（SO 4）3物种的硫酸化催化剂可以通过NH 3还原然后进行热处理进行原位再生。显着地，与新鲜催化剂相比，再生的催化剂表现出相同的表面/氧化还原性质并因此具有催化性能。
更新日期：2020-10-02
中文翻译：
新洞察NH的影响3上SO 2中毒在低温NH金属硫酸盐的原位去除3 -SCR过一种Fe-V催化剂
SO 2中毒是用于低温选择性催化还原NO的一个显著挑战X与NH 3。对这类硫酸化作用对催化剂的基本了解是寻找克服该问题的策略的重要步骤。在此，NH的效果3上的温度驱动硫酸盐化方法被系统地研究过的α-Fe组成的铁-V催化剂2 ö 3和FeVO 4。当SO 2 + O 2引起中毒时，高度分散且热稳定的Fe 2（SO 4）3会在催化剂表面上形成杂质。随着硫酸化温度的升高，这种中毒变得越来越严重，导致氧化还原性能，NO x活化能力的持续降低，进而导致低温催化性能的降低。随着NH 3的引入，在较低的温度（<250°C）下同时生成了额外的硫酸铵类物质，覆盖了表面反应位点，从而加剧了低温活性的下降。而Fe 2（SO 4）3的形成在较高的硫酸化温度（≥250°C）下会显着抑制该物种，它降低了在低反应温度下发生的中毒效应。具有稳定的Fe 2（SO 4）3物种的硫酸化催化剂可以通过NH 3还原然后进行热处理进行原位再生。显着地，与新鲜催化剂相比，再生的催化剂表现出相同的表面/氧化还原性质并因此具有催化性能。
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