Catalytic Adsorptive Desulfurization Using TiO2/SBA-15 under Mild Conditions
首发时间:2015-11-27
Abstract:This study investigates catalytic adsorptive desulfurization (CADS) of model diesel fuel using TiO2/SBA-15 under mild conditions. The TiO2/SBA-15 was prepared by a facile incipient wetness impregnation method and characterized by N2 adsorption and X-ray diffraction. The CADS referred to ADS performance were evaluated in a batch reactor. High desulfurization uptake of 12.7 mg/g was achieved at low sulfur concentration of 15 ppmw-S by TiO2/SBA-15 under CADS, which was two-magnitude higher than that under ADS without the in-situ catalytic oxidation of dibenzothiophene. Kinetic results suggested that the CADS equilibrium over TiO2/SBA-15 was reached fast in 0.5 h. In the CADS-TiO2/SBA-15 system, the TiO2 loading, cumene hydroperoxide/dibenzothiophene ratio and CADS temperature were optimized to be 10 wt.%, 2, and 35 C, respectively. Furthermore, desulfurization tests in 5 consecutive CADS-regeneration cycles suggested that the bi-functional TiO2/SBA-15 can be regenerated by acetonitrile washing followed with oxidative air treatment. The superior desulfurization uptake at low sulfur concentration range, fast adsorption kinetics, excellent regenerability, operation at mild conditions, and facile and low-cost adsorbent synthesis make the CADS-TiO2/SBA-15 system an effective and economic desulfurization approach for ultra-clean fuel production..
keywords: catalytic adsorptive desulfurization (CADS) TiO2/SBA-15 ultra-clean fuel
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TiO2/SBA-15在温和条件下催化吸附脱硫
摘要:本文主要研究了TiO2/SBA-15在温和条件下的催化吸附耦合脱硫。通过等体积浸渍法制备TiO2/SBA-15,并对其进行XRD和氮气吸附等表征。TiO2/SBA-15对低浓度的油品(15ppm-S)可达到12.7mg/g的高吸附容量,是相同条件下纯吸附脱硫容量的2倍。动力学实验显示:材料在0.5h内可迅速达到反应-吸附平衡。通过对反应条件的优化,确定耦合脱硫体系的最佳 TiO2 负载量为10 wt.%,氧硫比为2,反应温度为35 C。另外,TiO2/SBA-15可通过氧气处理以及乙腈洗涤进行重生,重生5次后效果仅略有降低。CADS-TiO2/SBA-15 体系具有低硫浓度下高吸附容量,反应速率快,再生性能好,常温反应以及廉价吸附剂等优点,在超清洁燃料生产中将有较好的发展前景。
关键词: 催化吸附耦合脱硫 TiO2/SBA-15 超清洁燃料
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No.4664409109418914****
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