Environmental Science and Pollution Research Pub Date : 2023-12-26 , DOI: 10.1007/s11356-023-31580-8 Alireza Hosseini 1 , Seyed Mehdi Alavi 1 , Amin Bazyari 1 , Akbar Valaei 1
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This research endeavors to address the pressing challenge of reducing sulfur content in fuels, an environmental imperative. It does so by employing bimetallic catalysts to enhance the efficiency of oxidative desulfurization (ODS) processes. This involves utilizing successive impregnation and co-impregnation methods to prepare a MoO3-V2O5/Al2O3. The catalysts underwent characterization using various techniques including X-ray diffraction (XRD), N2 adsorption–desorption, UV–vis (DRS), temperature-programmed desorption (NH3-TPD), Raman, Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), and energy dispersive spectrum (EDS). The catalyst was utilized for the evaluation of the ODS process of dibenzothiophene (DBT). The effects of oxidants, namely H2O2 and t-butyl hydroperoxide (TBHP), were studied in the ODS. The catalyst prepared using the co-impregnation method (5M-15V-co) demonstrated significant acidic sites and exhibited remarkable efficiency in oxidative desulfurization. Remarkably, this catalyst achieved 100% oxidation of sulfur components within 30 min (min). To assess the catalyst’s performance further, competitive compounds including nitrogen-containing compounds (NCCs) and saturated and unsaturated hydrocarbon compounds (HCs) were employed in the ODS. Initially, the introduction of NCCs led to a decrease in the sulfur removal rate; however, the catalyst successfully oxidized DBT completely within 60 min. When cyclohexene was present as an olefinic hydrocarbon compound, the catalyst oxidized DBT by approximately 75%, whereas DBT oxidation reached 100% within 20 min when p-xylene was introduced to the catalytic reactor. Additionally, as the O/S ratio increased from 2/5 to 10, the sulfur removal rate improved from 30 to 90%, indicating that HCs and NCCs compete with sulfur in terms of oxidant consumption.
Graphical Abstract
中文翻译：
探讨竞争化合物和催化剂合成方法对MoO3-V2O5/Al2O3催化剂DBT氧化脱硫的影响
这项研究致力于解决减少燃料中硫含量这一紧迫的环境挑战。它通过采用双金属催化剂来提高氧化脱硫 (ODS) 过程的效率来实现这一目标。这涉及利用连续浸渍和共浸渍方法来制备MoO 3 -V 2 O 5 /Al 2 O 3 。使用各种技术对催化剂进行表征，包括 X 射线衍射 (XRD)、N 2吸附-解吸、UV-vis (DRS)、程序升温解吸 (NH 3 -TPD)、拉曼、傅里叶变换红外光谱 (FTIR) 、场发射扫描电子显微镜 (FE-SEM) 和能量色散谱 (EDS)。该催化剂用于二苯并噻吩（DBT）的ODS工艺评价。在 ODS 中研究了氧化剂 H 2 O 2和叔丁基过氧化氢 (TBHP) 的影响。采用共浸渍法（5M-15V-co）制备的催化剂表现出显着的酸性位点，并表现出显着的氧化脱硫效率。引人注目的是，该催化剂在30分钟（min）内实现了硫组分的100%氧化。为了进一步评估催化剂的性能，在 ODS 中使用了竞争性化合物，包括含氮化合物 (NCC) 以及饱和和不饱和烃化合物 (HC)。最初，NCC 的引入导致硫去除率下降；然而，催化剂在60分钟内成功地将DBT完全氧化。 当环己烯作为烯烃化合物存在时，催化剂氧化DBT约75%，而当对二甲苯引入催化反应器时，DBT氧化在20分钟内达到100%。此外，随着O/S比从2/5增加到10，硫去除率从30%提高到90%，表明HCs和NCCs在氧化剂消耗方面与硫竞争。
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