Mn-Ce-Ti catalysts were prepared by different precursors (including manganese nitrate, manganese acetate, and manganese chloride) and used for selective catalytic reduction (SCR) of NO with ammonia. The relationships among the structure, physicochemical properties, and catalytic activity were explored by N2 adsorption/desorption, X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR), NH3-temperature programmed desorption (NH3-TPD), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HR-TEM), scanning electron microprobe (SEM) and energy dispersive spectroscopy (EDS) techniques. The results show that the different Mn precursors play important roles in the catalytic activity. The Mn-Ce-Ti(N) catalyst synthesized by manganese nitrate precursor exhibits the best catalytic activity, while the Mn-Ce-Ti(C) and Mn-Ce-Ti(Cl) catalyst prepared by manganese acetate and manganese chloride, respectively, exhibit relatively low catalytic activity. The manganese nitrate precursor could promote the specific surface area and redox ability, enhance the amounts of Brønsted and Lewis acid sites, and enrich the surface active species such as Mn4+, Ce3+ and surface chemisorbed oxygen of the catalyst, all of which will contribute to the SCR performance. Moreover, the Mn-Ce-Ti(N) catalyst possesses highly dispersed and uniform surface active species, which will result in the optimal physicochemical properties and superior catalytic performance.

中文翻译：

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活性物质的前驱体和分散对Mn-Ce-Ti催化剂的NO减排活性的影响

Mn-Ce-Ti 催化剂由不同的前驱体（包括硝酸锰、醋酸锰和氯化锰）制备，用于氨选择性催化还原（SCR）NO。通过N2吸附/解吸、X射线衍射（XRD）、H2-程序升温还原（H2-TPR）、NH3-程序升温脱附（NH3-TPD）、 X 射线光电子能谱 (XPS)、高分辨率透射电子显微镜 (HR-TEM)、扫描电子探针 (SEM) 和能量色散光谱 (EDS) 技术。结果表明，不同的Mn前驱体在催化活性中起重要作用。由硝酸锰前驱体合成的Mn-Ce-Ti(N)催化剂表现出最好的催化活性，而分别由醋酸锰和氯化锰制备的 Mn-Ce-Ti(C) 和 Mn-Ce-Ti(Cl) 催化剂表现出相对较低的催化活性。硝酸锰前驱体可以提高比表面积和氧化还原能力，增加布朗斯台德和路易斯酸位的数量，并丰富催化剂的表面活性物质，如Mn4+、Ce3+和表面化学吸附氧，所有这些都有助于可控硅性能。此外，Mn-Ce-Ti(N)催化剂具有高度分散和均匀的表面活性物质，这将导致最佳的理化性质和优越的催化性能。硝酸锰前驱体可以提高比表面积和氧化还原能力，增加布朗斯台德和路易斯酸位的数量，并丰富催化剂的表面活性物质，如Mn4+、Ce3+和表面化学吸附氧，所有这些都有助于可控硅性能。此外，Mn-Ce-Ti(N)催化剂具有高度分散和均匀的表面活性物质，这将导致最佳的理化性质和优越的催化性能。硝酸锰前驱体可以提高比表面积和氧化还原能力，增加布朗斯台德和路易斯酸位的数量，并丰富催化剂的表面活性物质，如Mn4+、Ce3+和表面化学吸附氧，所有这些都有助于可控硅性能。此外，Mn-Ce-Ti(N)催化剂具有高度分散和均匀的表面活性物质，这将导致最佳的理化性质和优越的催化性能。