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首页> 外文期刊>Fuel >Ultra-fast and highly efficient catalytic oxidative desulfurization of dibenzothiophene at ambient temperature over low Mn loaded Co-Mo/ Al_2O_3 and Ni-Mo/Al_2O_3 catalysts using NaClO as oxidant
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Ultra-fast and highly efficient catalytic oxidative desulfurization of dibenzothiophene at ambient temperature over low Mn loaded Co-Mo/ Al_2O_3 and Ni-Mo/Al_2O_3 catalysts using NaClO as oxidant

机译：使用NaClO作为氧化剂的低锰负载Co-Mo / Al_2O_3和Ni-Mo / Al_2O_3催化剂在环境温度下对二苯并噻吩的超快速高效催化氧化脱硫

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摘要

This study reports the ultra-fast and highly efficient oxidative desulfurization (ODS) of dibenzothiophene (DBT) at room temperature over low Mn (0.5 wt%) incorporated Co-Mo/Al2O3 and Ni-Mo/Al(2)O(3 )catalysts using NaClO as oxidant. The effect of disparate operating parameters i.e. mode of catalyst preparation, DBT initial concentration, reaction time, temperature, catalyst and oxidant dose, oxidant type and reaction pH on oxidation process was investigated. Results revealed that remarkably high and ultra-fast A DBT conversion of 100% was achieved within 5 min utilizing 15 mL sample of 2000 ppm (347 ppm sulfur), 0.1 mL of 0.138 M NaClO (O/S6.6 mol/mol), 0.1 g Mn-Co-Mo/Al2O3 catalyst at pH 12, and 25 degrees C reaction temperature. A reaction mechanism for the highly efficient ODS activity of Mn promoted catalysts accredited to the synergistic effect of Mn active phase and high oxidizing power of NaClO was proposed. An overall ODS catalytic activity order of: Mn-Co-Mo/Al2O3 Mn-Ni-Mo/Al2O3 Co-Mo/Al2O3 Ni-Mo/Al2O3 Mo/Al2O3 was observed. Discernment of the surface morphology and textural properties of fresh and spent catalysts were characterized using Scanning electron microscopy (SEM), X-ray diffraction (XRD), Energy dispersive X-Ray (EDX), and BET surface area analysis which helped in evaluating the catalytic activity results. Due to ultra-fast and highly efficacious nature, simple and safe mechanization, cost effectiveness, and operation at ambient reaction conditions, this study can be envisaged as an effective approach for the ODS of fuel oils on industrial level.
机译：这项研究报告了在低锰（0.5 wt％）掺入Co-Mo / Al2O3和Ni-Mo / Al（2）O（3）的情况下在室温下对二苯并噻吩（DBT）的超快速高效氧化脱硫（ODS） NaClO作为氧化剂的催化剂。研究了不同的操作参数，即催化剂的制备方式，DBT初始浓度，反应时间，温度，催化剂和氧化剂的用量，氧化剂的类型和反应的pH对氧化过程的影响。结果表明，使用15 mL的2000 ppm（347 ppm硫）样品，0.1 mL的0.138 M NaClO（O / S6.6 mol / mol），5 mL样品，可以在5分钟内实现100％的DBT极高且超快的转化，在pH 12和25摄氏度的反应温度下，添加0.1克Mn-Co-Mo / Al2O3催化剂。提出了Mn活性相与NaClO高氧化力协同作用的Mn促进催化剂的高效ODS活性反应机理。观察到总的ODS催化活性顺序为：Mn-Co-Mo / Al 2 O 3> Mn-Ni-Mo / Al 2 O 3> Co-Mo / Al 2 O 3> Ni-Mo / Al 2 O 3> Mo / Al 2 O 3。使用扫描电子显微镜（SEM），X射线衍射（XRD），能量色散X射线（EDX）和BET表面积分析来表征新鲜催化剂和废催化剂的表面形态和质地特性，从而有助于评估催化活性的结果。由于具有超快和高效的特性，简单且安全的机械化，成本效益以及在环境反应条件下运行的特点，因此该研究可被认为是在工业水平上对燃油进行ODS的有效方法。

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