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Fe2O3/HY Catalyst: A Microporous Material with Zeolite-Type Framework Achieving Highly Improved Alkali Poisoning-Resistant Performance for Selective Reduction of NOx with NH3.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-05-14 , DOI: 10.1021/acs.est.0c00298 Yueyao Du 1 , Zhiwei Huang 1 , Jie Zhang 1 , Guohua Jing 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-05-14 , DOI: 10.1021/acs.est.0c00298 Yueyao Du 1 , Zhiwei Huang 1 , Jie Zhang 1 , Guohua Jing 1
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The commercially available V2O5/WO3–TiO2 is a well-known catalyst for selective catalytic reduction (SCR) of NO with NH3. When alkali ions are present in the exhaust (e.g., as impurities such as dust) of a reactor containing commercial V2O5/WO3–TiO2, alkali poisoning occurs, deactivating the catalyst. Consequently, there is substantial interest in the development of better-performing and more durable NH3–SCR catalysts with an improved resistance to alkali deactivation. For the present study, the protonated (H+) form of zeolite Y, HY, was used as a support and acted as buffer zone, leading to trapping (sticking) of foreign alkali poisons in the zeolite pore structure, preventing alkali poisoning of the Fe2O3/HY catalyst. Catalytic tests showed that the Fe2O3/HY retained 100% of its original catalytic reactivity for NH3–SCR reaction even after 1000 μmol Na+ g–1 poisoning. 1000 μmol Na+ g–1 treatment indicates a 26 000-h exposure under an alkaline dust-containing condition. In contrast, upon 1000 μmol Na+ g–1 treatment, severe alkali deactivation occurred for a commercial V2O5/WO3–TiO2. The catalyst activity of Fe2O3/HY remained unchanged because of the intercalation of Na+ in the internal HY zeolite pores that impedes the blocking of Na+ poison to the external active sites of Fe2O3. The findings in this work suggest that the zeolite HY may be revealed as an attractive building block for designing an alkali poisoning-resistant catalyst.
中文翻译：
Fe2O3 / HY催化剂：具有沸石型骨架的微孔材料，可实现高度改进的耐碱中毒性能，以选择性地还原NH3。
市售的V 2 O 5 / WO 3 -TiO 2是用于用NH 3选择性还原NO的众所周知的催化剂。当含有商用V 2 O 5 / WO 3 -TiO 2的反应器的排气中存在碱金属离子（例如，诸如灰尘之类的杂质）时，会发生碱中毒，从而使催化剂失活。因此，人们对开发性能更好，更耐用的NH 3 -SCR催化剂具有更强的抗碱失活性有着浓厚的兴趣。在本研究中，质子化（H +Y）HY型沸石用作载体并充当缓冲区，导致外来碱金属毒物截留（粘附）在沸石孔结构中，从而防止了Fe 2 O 3 / HY催化剂的碱中毒。催化测试表明，即使在1000μmolNa + g –1中毒后，Fe 2 O 3 / HY仍能保留其对NH 3 -SCR反应的原始催化活性的100％。1000μmolNa + g –1处理表明在含尘的碱性条件下暴露26 000小时。相反，在1000μmolNa + g –1时处理后，商用V 2 O 5 / WO 3 -TiO 2发生了严重的碱失活。Fe 2 O 3 / HY的催化剂活性保持不变，这是因为Na +插在内部HY沸石孔中，阻碍了Na +毒物对Fe 2 O 3的外部活性位的阻断。这项工作的发现表明，HY沸石可以作为设计耐碱中毒催化剂的有吸引力的组成部分而被揭示。
更新日期：2020-05-14
中文翻译：
Fe2O3 / HY催化剂：具有沸石型骨架的微孔材料，可实现高度改进的耐碱中毒性能，以选择性地还原NH3。
市售的V 2 O 5 / WO 3 -TiO 2是用于用NH 3选择性还原NO的众所周知的催化剂。当含有商用V 2 O 5 / WO 3 -TiO 2的反应器的排气中存在碱金属离子（例如，诸如灰尘之类的杂质）时，会发生碱中毒，从而使催化剂失活。因此，人们对开发性能更好，更耐用的NH 3 -SCR催化剂具有更强的抗碱失活性有着浓厚的兴趣。在本研究中，质子化（H +Y）HY型沸石用作载体并充当缓冲区，导致外来碱金属毒物截留（粘附）在沸石孔结构中，从而防止了Fe 2 O 3 / HY催化剂的碱中毒。催化测试表明，即使在1000μmolNa + g –1中毒后，Fe 2 O 3 / HY仍能保留其对NH 3 -SCR反应的原始催化活性的100％。1000μmolNa + g –1处理表明在含尘的碱性条件下暴露26 000小时。相反，在1000μmolNa + g –1时处理后，商用V 2 O 5 / WO 3 -TiO 2发生了严重的碱失活。Fe 2 O 3 / HY的催化剂活性保持不变，这是因为Na +插在内部HY沸石孔中，阻碍了Na +毒物对Fe 2 O 3的外部活性位的阻断。这项工作的发现表明，HY沸石可以作为设计耐碱中毒催化剂的有吸引力的组成部分而被揭示。
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