Abstract

This study investigates the catalytic activity of mixed–metal oxide nanoparticles with different surface acidities on asphaltene adsorption followed by catalytic oxidation–decomposition. Three different types of mixed–metal oxide nanoparticles (CeNiO₃, CeCaO₃ and CeZrO₄) were synthesized, and their size, structure, and acid properties were characterized by field–emission scanning electron microscopy (FE–SEM), energy-dispersive X-ray spectroscopy (EDX), the high–resolution transmission electron microscopy (HR-TEM), X-ray powder diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area measurement and ammonia temperature-programmed desorption (NH₃–TPD). Asphaltenes were extracted from two different Iranian crude oil samples (Kuh-e-Mond with API = 12.8 and Bangestan with API = 23.8). For all the three mixed-metal oxide nanoparticles, the isotherm data fitted well to the Langmuir model for both asphaltene types. Results showed that the adsorption capacity and affinity of nanoparticles decreases in the order of CeNiO₃ > CeCaO₃ > CeZrO₄ for both types. Asphaltenes adsorbed over nanoparticles were subjected to oxidation–decomposition in a thermogravimetric analyzer (TGA) to study the catalytic effect of nanoparticles. Results showed the oxidation−decomposition temperature of asphaltene decreased about 155–180°C for Kuh-e-Mond asphaltene and 95–150°C for Bangestan asphaltene in the presence of nanoparticles, showing their catalytic effect.

中文翻译：

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混合金属氧化物纳米粒子（CeNiO 3，CeZrO 4，CeCaO 3）的合成，表征及其在不同化学结构沥青的吸附和催化氧化分解中的应用

摘要

这项研究研究了具有不同表面酸度的混合金属氧化物纳米颗粒对沥青质的催化活性，然后催化氧化分解。合成了三种不同类型的混合金属氧化物纳米粒子（CeNiO ₃，CeCaO ₃和CeZrO ₄），并通过场发射扫描电子显微镜（FE-SEM），能量色散X表征了它们的尺寸，结构和酸性质射线光谱法（EDX），高分辨率透射电子显微镜（HR-TEM），X射线粉末衍射（XRD），Brunauer-Emmett-Teller（BET）表面积测量和氨程序升温脱附（NH _3）–TPD）。从两个不同的伊朗原油样品（API = 12.8的Kuh-e-Mond和API = 23.8的Bangestan）中提取沥青质。对于所有三种混合金属氧化物纳米颗粒，两种沥青质的等温线数据都非常适合Langmuir模型。结果表明，纳米颗粒的吸附能力和亲和力按CeNiO ₃ > CeCaO ₃ > CeZrO ₄的顺序降低。两种类型。吸附在纳米颗粒上的沥青质在热重分析仪（TGA）中进行氧化分解，以研究纳米颗粒的催化作用。结果表明，在存在纳米粒子的情况下，Kuh-e-Mond沥青质的沥青质氧化分解温度降低了155-180°C，Bangestan沥青质的氧化分解温度降低了95-150°C，显示了它们的催化作用。