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SO2- and H2O-Tolerant Catalytic Reduction of NOx at a Low Temperature via Engineering Polymeric VOx Species by CeO2
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-04-03 , DOI: 10.1021/acs.est.1c08715
Weiwei Hu 1 , Jiebing He 1 , Xiangyu Liu 1 , Huijun Yu 1 , Xinyu Jia 1 , Tingting Yan 1 , Lupeng Han 1 , Dengsong Zhang 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-04-03 , DOI: 10.1021/acs.est.1c08715
Weiwei Hu 1 , Jiebing He 1 , Xiangyu Liu 1 , Huijun Yu 1 , Xinyu Jia 1 , Tingting Yan 1 , Lupeng Han 1 , Dengsong Zhang 1
Affiliation
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Selective catalytic reduction (SCR) of NOx over V2O5-based oxide catalysts has been widely used, but it is still a challenge to efficiently reduce NOx at low temperatures under SO2 and H2O co-existence. Herein, SO2- and H2O-tolerant catalytic reduction of NOx at a low temperature has been originally demonstrated via engineering polymeric VOx species by CeO2. The polymeric VOx species were tactfully engineered on Ce–V2O5 composite active sites via the surface occupation effect of Ce, and the obtained catalysts exhibited remarkable low-temperature activity and strong SO2 and H2O tolerance at 250 °C. The strong interaction between Ce and V species induced the electron transfer from V to Ce and tuned the SCR reaction via the E–R pathway between the NH4+/NH3 species and gaseous NO. In the presence of SO2 and H2O, the polymeric VOx species had not been hardly influenced, while the formation of sulfate species on Ce sites not only promoted the adsorption of NH4+ species and the reaction between gaseous NO and NH4+ but also facilitated the decomposition of ammonium bisulfate through weakening the strong bond between HSO4– and NH4+. This work provided a new strategy for SO2- and H2O-tolerant catalytic reduction of NOx at a low temperature.
中文翻译：
CeO2 工程聚合物 VOx 物种在低温下耐 SO2 和 H2O 催化还原 NOx
在V 2 O 5基氧化物催化剂上对NO x的选择性催化还原(SCR)已被广泛应用，但在SO 2和H 2 O共存下在低温下有效还原NO x仍然是一个挑战。在此，低温下耐SO 2 - 和H 2 O 的NO x催化还原最初已通过CeO 2的工程聚合VO x物种得到证实。在 Ce–V 2 O 5上巧妙地设计了聚合的 VO x物种通过Ce的表面占据效应复合活性位点，得到的催化剂在250 ℃下表现出显着的低温活性和较强的SO 2和H 2 O耐受性。Ce和V物质之间的强相互作用诱导了电子从V到Ce的转移，并通过NH 4 + /NH 3物质和气态NO之间的E-R途径调节了SCR反应。在SO 2和H 2 O的存在下，聚合物VO x物种几乎没有受到影响，而Ce位点上硫酸盐物种的形成不仅促进了NH 4 +物种的吸附以及气态NO与NH 4之间的反应+还通过削弱 HSO 4 -和 NH 4 +之间的强键促进硫酸氢铵的分解。该工作为耐SO 2 - 和H 2 O的低温催化还原NO x提供了新的策略。
更新日期：2022-04-03
中文翻译：
CeO2 工程聚合物 VOx 物种在低温下耐 SO2 和 H2O 催化还原 NOx
在V 2 O 5基氧化物催化剂上对NO x的选择性催化还原(SCR)已被广泛应用，但在SO 2和H 2 O共存下在低温下有效还原NO x仍然是一个挑战。在此，低温下耐SO 2 - 和H 2 O 的NO x催化还原最初已通过CeO 2的工程聚合VO x物种得到证实。在 Ce–V 2 O 5上巧妙地设计了聚合的 VO x物种通过Ce的表面占据效应复合活性位点，得到的催化剂在250 ℃下表现出显着的低温活性和较强的SO 2和H 2 O耐受性。Ce和V物质之间的强相互作用诱导了电子从V到Ce的转移，并通过NH 4 + /NH 3物质和气态NO之间的E-R途径调节了SCR反应。在SO 2和H 2 O的存在下，聚合物VO x物种几乎没有受到影响，而Ce位点上硫酸盐物种的形成不仅促进了NH 4 +物种的吸附以及气态NO与NH 4之间的反应+还通过削弱 HSO 4 -和 NH 4 +之间的强键促进硫酸氢铵的分解。该工作为耐SO 2 - 和H 2 O的低温催化还原NO x提供了新的策略。
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