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首页> 外文期刊>RSC Advances >Manipulating catalytic activity and durability of Pt-modified Cu–Fe–La/γ-Al2O3 ternary catalyst for catalytic wet air oxidation: effect of calcination temperature
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Manipulating catalytic activity and durability of Pt-modified Cu–Fe–La/γ-Al2O3 ternary catalyst for catalytic wet air oxidation: effect of calcination temperature

机译：Pt改性Cu–Fe–La /γ-Al 2 O 3 三元催化湿空气氧化的催化活性和耐久性：煅烧温度的影响

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A series of novel Pt-modified Cu–Fe–La/γ-Al2O3 catalysts were prepared by an incipient-wetness impregnation method, and their performances were evaluated in catalytic wet air oxidation (CWAO) of printing and dyeing wastewater (PDW). The as-prepared catalysts were characterized by X-ray photoelectron spectroscopy (XPS), nitrogen adsorption–desorption, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Raman spectroscopy, and temperature programmed reduction by hydrogen (H2-TPR). The effects of catalyst composition and calcination temperature on the catalytic performance were investigated. The chemical oxygen demand (COD) removal efficiency and decolorization rate are satisfactory over Cu1.5Fe1.5La3/γ-Al2O3 catalyst, with poor stability under CWAO conditions. In contrast, catalytic performance and stability of all Pt-modified catalysts are significantly improved. With increasing calcination temperatures from 350 °C to 750 °C, the activity of the catalysts significantly decreases from 97.3% to 84.6%, and the size of the particles varies from 4.71–6.95 nm. The XRD, HRTEM, and XPS results indicate that the Pt1Cu1Fe1La3/γ-Al2O3 catalyst mostly comprises Pt, CuO, Fe3O4, and La2O3, and the incorporation of Pt increases the binding energies (BEs) of the metal elements in the catalyst, owing to synergistic interactions between the Pt and the Cu, Fe, and La elements. After five cycles, the COD removal efficiency and decolorization rate for PDW over the Pt1Cu1Fe1La3/γ-Al2O3 catalyst calcined at 650 °C remain comparable with the fresh catalyst, indicating that Pt-modified Cu–Fe–La/γ-Al2O3 ternary oxide is a promising catalyst with high activity and stability for CWAO treatment.
机译：制备了一系列新型的Pt改性的Cu-Fe-La /γ-Al 2 O 3 催化剂通过初湿浸渍法，评价了它们在印染废水（PDW）的催化湿式氧化（CWAO）中的性能。所制备的催化剂通过X射线光电子能谱（XPS），氮吸附-解吸，X射线衍射（XRD），场发射扫描电子显微镜（FESEM），透射电子显微镜（TEM），拉曼光谱和氢气程序升温还原（H 2 -TPR）。研究了催化剂组成和煅烧温度对催化剂性能的影响。在Cu 1.5 Fe 1.5 La 3 /γ-Al 2 O 3 催化剂，在CWAO条件下稳定性差。相反，所有Pt改性催化剂的催化性能和稳定性都得到了显着提高。随着煅烧温度从350°C增加到750°C，催化剂的活性从97.3％显着降低到84.6％，颗粒尺寸在4.71–6.95 nm之间变化。 XRD，HRTEM和XPS结果表明Pt 1 Cu 1 Fe 1 La 3 /γ-Al 2 O 3 催化剂主要由Pt，CuO，Fe 3 O 4 组成，和La 2 O 3 ，Pt的引入增加了金属元素的结合能（BEs）由于Pt与Cu，Fe和La元素之间存在协同作用，因此在催化剂中的含量较高。经过五个循环后，Pt 1 Cu 1 Fe 1 La 3 /γ-Al 2 O <在650°C下煅烧的small> 3 催化剂仍与新鲜催化剂相当，表明Pt改性的Cu–Fe–La /γ-Al 2 O 3 三元氧化物是一种有前途的催化剂，具有高活性和稳定性，可用于CWAO处理。

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