当前位置：
X-MOL 学术
›
Catal. Sci. Technol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
FeVO4-supported Mn–Ce oxides for the low-temperature selective catalytic reduction of NOx by NH3
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2021-08-30 , DOI: 10.1039/d1cy01424b Shuqi Zhao 1 , Jian-Wen Shi 1 , Cihang Niu 1 , Baorui Wang 1 , Chi He 2 , Wei Liu 3 , Lei Xiao 3 , Dandan Ma 1 , Hongkang Wang 1 , Yonghong Cheng 1
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2021-08-30 , DOI: 10.1039/d1cy01424b Shuqi Zhao 1 , Jian-Wen Shi 1 , Cihang Niu 1 , Baorui Wang 1 , Chi He 2 , Wei Liu 3 , Lei Xiao 3 , Dandan Ma 1 , Hongkang Wang 1 , Yonghong Cheng 1
Affiliation
|
Iron vanadate (FeVO4) nanorods are used as a carrier to support manganese (Mn) and cerium (Ce) oxides for the selective catalytic reduction (SCR) of nitrogen oxides (NOx) with NH3 for the first time. Among these developed Ce–Mn/FeVO4 catalysts with different molar ratios of Ce/Mn, the Ce0.2Mn0.2/FeVO4 catalyst exhibits the best de-NOx performance and N2 selectivity, which are higher than 90% in a wide temperature window of 90–420 °C. Through a series of characterization techniques, it is found that the synergistic effect between Ce and Mn enhances the reduction ability and the number of acid sites on the catalyst, which facilitates the adsorption and conversion of flue gas. The introduction of an appropriate ratio of Ce/Mn increases the concentration of Mn4+ and chemisorbed oxygen (OS) on the catalyst, leading to a “fast SCR reaction” with oxidizing NO to NO2, which significantly improves the low-temperature de-NOx efficiency. In addition, the interaction between the active components (Ce/Mn) and the support (FeVO4) increases the de-NOx performance of Ce0.2Mn0.2/FeVO4 at high temperatures. In the meantime, the Mn4+ + Ce3+ ↔ Mn3+ + Ce4+ reduction electron pair formed between Ce and Mn promotes the transport of electrons, which is also beneficial for the SCR reaction at low temperature. The in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) reveals that the SCR reaction over Ce0.2Mn0.2/FeVO4 catalyst follows both Eley–Rideal (E–R) and Langmuir–Hinshelwood (L–H) reaction mechanisms.
中文翻译：
FeVO4负载的Mn-Ce氧化物用于NH3低温选择性催化还原NOx
钒酸铁 (FeVO 4 ) 纳米棒首次用作载体以承载锰 (Mn) 和铈 (Ce) 氧化物，用于氮氧化物 (NO x ) 与 NH 3的选择性催化还原 (SCR) 。在这些具有不同Ce/Mn摩尔比的Ce-Mn/FeVO 4催化剂中，Ce 0.2 Mn 0.2 /FeVO 4催化剂表现出最好的脱NO x性能和N 2选择性，在 90-420 °C 的宽温度范围内高于 90%。通过一系列表征技术发现，Ce和Mn之间的协同作用增强了催化剂上的还原能力和酸位的数量，有利于烟气的吸附和转化。适当的Ce/Mn比值的引入增加了催化剂上Mn 4+和化学吸附氧（O S）的浓度，导致“快速SCR反应”将NO氧化为NO 2，显着提高了催化剂的低温性能。 DE-NO X效率。另外，活性组分（CE / Mn）和支撑件（FeVO之间的相互作用4）增加脱NO XCe 0.2 Mn 0.2 /FeVO 4在高温下的性能。同时，Ce和Mn之间形成的Mn 4+ + Ce 3+ ↔ Mn 3+ + Ce 4+还原电子对促进了电子的传输，这也有利于低温下的SCR反应。该原位漫反射红外线傅里叶变换光谱法（DRIFTS）显示，在Ce的SCR反应0.2锰0.2 / FeVO 4催化剂如下两者ELEY-Rideal（E-R）和Langmuir-欣谢尔伍德（L-H）的反应机制。
更新日期：2021-09-14
中文翻译：
FeVO4负载的Mn-Ce氧化物用于NH3低温选择性催化还原NOx
钒酸铁 (FeVO 4 ) 纳米棒首次用作载体以承载锰 (Mn) 和铈 (Ce) 氧化物，用于氮氧化物 (NO x ) 与 NH 3的选择性催化还原 (SCR) 。在这些具有不同Ce/Mn摩尔比的Ce-Mn/FeVO 4催化剂中，Ce 0.2 Mn 0.2 /FeVO 4催化剂表现出最好的脱NO x性能和N 2选择性，在 90-420 °C 的宽温度范围内高于 90%。通过一系列表征技术发现，Ce和Mn之间的协同作用增强了催化剂上的还原能力和酸位的数量，有利于烟气的吸附和转化。适当的Ce/Mn比值的引入增加了催化剂上Mn 4+和化学吸附氧（O S）的浓度，导致“快速SCR反应”将NO氧化为NO 2，显着提高了催化剂的低温性能。 DE-NO X效率。另外，活性组分（CE / Mn）和支撑件（FeVO之间的相互作用4）增加脱NO XCe 0.2 Mn 0.2 /FeVO 4在高温下的性能。同时，Ce和Mn之间形成的Mn 4+ + Ce 3+ ↔ Mn 3+ + Ce 4+还原电子对促进了电子的传输，这也有利于低温下的SCR反应。该原位漫反射红外线傅里叶变换光谱法（DRIFTS）显示，在Ce的SCR反应0.2锰0.2 / FeVO 4催化剂如下两者ELEY-Rideal（E-R）和Langmuir-欣谢尔伍德（L-H）的反应机制。
京公网安备 11010802027423号