Polyoxometalates ionic liquids based magnetic nanocomposites as an efficient heterogeneous catalysts for oxidation of thiobenzoic acid and dibenzothiophene by employing RP-HPLC-UV

IF 2.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron Pub Date : 2024-11-16 DOI:10.1016/j.poly.2024.117311

Roman Jaffar , Najla AlMasoud , Khurram Shahzad Munawar , Sana Rauf , Taghrid S. Alomar , Hafiz Muhammad Asif , Zeinhom M. El-Bahy , Hameed Ullah , Saifullah

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Abstract

Sulfur compounds need to be effectively rejected from fuel to maintain a clean environment. The removal of sulfur compounds from thiocompounds has received increased attention due to the negative environmental and industrial consequences of sulfur emissions. We examine the effectiveness of polyoxometalate (POM) ionic liquid-based nanocomposites as catalysts for the oxidative desulfurization of thiobenzoic acid and other sulfur-containing chemicals. Na-POMIL@NCP and Cr-POMIL@NCP were synthesized and thoroughly characterized using a variety of analytical techniques, including Fourier-transform infrared spectroscopy (FT-IR), UV–visible spectroscopy, powder X-ray diffraction (P-XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), fluorescence spectroscopy, and vibrating sample magnetometer (VSM). POMIL-based nanocomposites with Fe₃O₄@SiO₂ exhibit both catalytic activity and adsorption capability. To evaluate sulfur removal efficiency and investigate the transformation paths of the thio compounds, high-performance liquid chromatography (HPLC) was performed at 33 °C using a C18 column with an acetonitrile–water mobile phase (1:1 ratio). The catalytic conversion of thiobenzoic acid and dibenzothiophene occurs at temperature, oxidant O/S ratio and catalyst concentration were investigated to determine the best catalyst for a given process. Under moderate conditions, this work proposes a cost-effective and ecologically acceptable approach for thiobenzoic acid (TB) and dibenzothiophene (DBT) production employing H₂O₂ as an oxidant and Na-POMIL@NCP and Cr-POMIL@NCP as heterogeneous catalysts. They are highly effective for oxidizing sulfur compounds included in diesel to lower the sulfur levels of fuel. This study provides to the development of innovative materials for ecologically friendly sulfur removal applications.

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利用 RP-HPLC-UV 将基于聚氧化金属离子液体的磁性纳米复合材料作为氧化硫代苯甲酸和二苯并噻吩的高效异相催化剂

为了保持环境清洁，需要有效地去除燃料中的硫化合物。由于硫排放对环境和工业造成的负面影响，从硫代化合物中去除硫化合物的研究受到越来越多的关注。我们研究了聚氧化金属（POM）离子液体基纳米复合材料作为催化剂对硫代苯甲酸和其他含硫化学品进行氧化脱硫的有效性。研究人员合成了 Na-POMIL@NCP 和 Cr-POMIL@NCP，并使用多种分析技术对其进行了全面表征，包括傅立叶变换红外光谱（FT-IR）、紫外-可见光谱、粉末 X 射线衍射（P-XRD）、扫描电子显微镜（SEM）、粉末 X 射线衍射（P-XRD）和傅立叶变换红外光谱（FT-IR）、扫描电子显微镜 (SEM)、能量色散 X 射线光谱仪 (EDX)、热重分析 (TGA)、差示扫描量热仪 (DSC)、荧光光谱仪和振动样品磁力计 (VSM)。基于 POMIL 的 Fe3O4@SiO2 纳米复合材料同时具有催化活性和吸附能力。为了评估硫的去除效率并研究硫代化合物的转化路径，在 33 °C下使用C18色谱柱和乙腈-水流动相（1:1）进行了高效液相色谱分析。研究了硫代苯甲酸和二苯并噻吩的催化转化温度、氧化剂 O/S 比率和催化剂浓度，以确定特定工艺的最佳催化剂。在中等条件下，本研究提出了一种具有成本效益且生态上可接受的硫代苯甲酸（TB）和二苯并噻吩（DBT）生产方法，该方法采用 H2O2 作为氧化剂，Na-POMIL@NCP 和 Cr-POMIL@NCP 作为异相催化剂。它们对氧化柴油中的硫化合物以降低燃料中的硫含量非常有效。这项研究为开发生态友好型脱硫应用的创新材料提供了思路。

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来源期刊

Polyhedron 化学-晶体学

CiteScore

4.90

自引率

7.70%

发文量

515

审稿时长

2 months

期刊介绍： Polyhedron publishes original, fundamental, experimental and theoretical work of the highest quality in all the major areas of inorganic chemistry. This includes synthetic chemistry, coordination chemistry, organometallic chemistry, bioinorganic chemistry, and solid-state and materials chemistry. Papers should be significant pieces of work, and all new compounds must be appropriately characterized. The inclusion of single-crystal X-ray structural data is strongly encouraged, but papers reporting only the X-ray structure determination of a single compound will usually not be considered. Papers on solid-state or materials chemistry will be expected to have a significant molecular chemistry component (such as the synthesis and characterization of the molecular precursors and/or a systematic study of the use of different precursors or reaction conditions) or demonstrate a cutting-edge application (for example inorganic materials for energy applications). Papers dealing only with stability constants are not considered.