Enhancement of SO2 Resistance on Submonolayer V2O5–MnO2/CeO2 Catalyst by Three-Dimensional Ordered Mesoporous CeO2 in Low-Temperature NH3–SCR,Energy & Fuels

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Enhancement of SO2 Resistance on Submonolayer V2O5–MnO2/CeO2 Catalyst by Three-Dimensional Ordered Mesoporous CeO2 in Low-Temperature NH3–SCR
Energy & Fuels ( IF 5.2 ) Pub Date : 2022-02-18 , DOI: 10.1021/acs.energyfuels.1c04379
Kaiwen Ni ₁ , Yuewang Peng ₁ , Yuting Wang ₁ , Zhiwei Huang ₁ , Huawang Zhao ₁ , Xiaomin Wu ₁ , Guohua Jing ₁

Affiliation

Developing low-temperature (<300 °C) SO₂-tolerant catalysts for NO_x reduction is a challenge. A catalyst architecture of three-dimensional (3D) ordered mesoporous CeO₂ supported by submonolayer V₂O₅ and MnO₂ (V₂O₅–MnO₂/3D-CeO₂) was successfully prepared to promote the SO₂ resistance in low-temperature selective catalytic reduction (SCR). The 3D ordered mesoporous channels were retained even after the exposure of the catalyst to SO₂ and H₂O. The presence of a highly 3D ordered mesoporous structure of V₂O₅–MnO₂/3D-CeO₂ can lead to high vapor pressure, which was beneficial for ammonium bisulfate vaporization and decomposition, eventually protecting the active vanadia sites. The stable active crystalline V₂O₅ species and the formative cerium sulfate promoters were crucial for determining the low-temperature SCR activity and SO₂ tolerance in the presence of SO₂ and H₂O. Therefore, our V₂O₅–MnO₂/3D-CeO₂ catalyst delivered a large temperature range of 250–320 °C with NO conversion above 95%. The 3D ordered mesoporous channels of the V₂O₅–MnO₂/3D-CeO₂ catalyst provided an effective way to improve the SO₂ resistance at 250 °C.

中文翻译：

三维有序介孔 CeO2 在低温 NH3-SCR 中增强亚单层 V2O5-MnO2/CeO2 催化剂的 SO2 抗性

_{开发用于减少 NO x}的低温 (<300 °C) SO ₂耐受催化剂是一项挑战。成功制备了由亚单层V ₂ O ₅和MnO ₂负载的三维（3D）有序介孔CeO ₂催化剂结构（V ₂ O ₅ -MnO ₂ /3D-CeO ₂），以提高低-SO ₂电阻。温度选择性催化还原（SCR）。即使在催化剂暴露于 SO ₂和 H ₂ O 之后，3D 有序介孔通道仍然保留。V 的高度 3D 有序介孔结构的存在₂ O ₅ –MnO ₂ /3D-CeO ₂可导致高蒸气压，有利于硫酸氢铵的汽化和分解，最终保护活性钒位点。稳定的活性结晶 V ₂ O _{5物种和形成的硫酸铈促进剂对于确定在 SO}₂和 H ₂ O 存在下的低温 SCR 活性和 SO ₂耐受性至关重要。因此，我们的 V ₂ O ₅ -MnO ₂ /3D-CeO ₂催化剂提供了 250-320°C 的大温度范围，NO 转化率高于 95%。_{V 2} O ₅ -MnO ₂ /3D-CeO ₂催化剂的3D有序介孔通道为提高250℃下的SO ₂抗性提供了有效途径。

更新日期：2022-02-18

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