The catalytic performance of Mo supported on hierarchical alumina–silica(Si/Al = 15) with Mo loadings of 3, 6 and 15 wt% was investigated for the oxidative desulfurization(ODS) of model and real oil samples. Hierarch...The catalytic performance of Mo supported on hierarchical alumina–silica(Si/Al = 15) with Mo loadings of 3, 6 and 15 wt% was investigated for the oxidative desulfurization(ODS) of model and real oil samples. Hierarchical alumina–silica(h Al–Si) was synthesized by economical and ecofriendly silicate-1 seed-induced route using cetyltrimethylammonium bromide(CTAB) as mesoporogen. The effect of CTAB on the structure of catalyst was studied by characterization techniques. The results revealed that 6%Mo/h Al–Si had the highest sulfur removal compared to the other catalyst loadings. The effect of operating parameters was evaluated using Box–Behnken experimental design. The optimal desulfurization conditions with the 6%Mo/h Al–Si catalyst were determined at oxidation temperature of 67 ℃, oxidation time of 42 min, H2O2/S molar ratio of 8 and catalyst dosage of 0.008 g·ml^-1 for achieving a conversion of 95%. Under optimal conditions, different sulfur-containing compounds with initial concentration of 1000 ppm, Dibenzothiophene(DBT), Benzothiophene(BT) and Thiophen(Th), showed the catalytic oxidation reactivity in the order of DBT > BT>Th. According to the regeneration experiments, the 6%Mo/h Al–Si catalyst was reused 4 times with a little reduction in the performance. Also, the total sulfur content of gasoline and diesel after ODS process reached 156.6 and 4592.2 ppm, respectively.展开更多
根据Box-Behnken中心组合试验设计原理,在条件试验基础上,采用六因素三水平的响应曲面分析法,建立了柞水菱铁尾矿深度还原-磁选工艺的二次多项式模型,试验以磁选铁精矿的品位为响应值作响应面和等高线值,研究了不同试验条件对铁精矿品...根据Box-Behnken中心组合试验设计原理,在条件试验基础上,采用六因素三水平的响应曲面分析法,建立了柞水菱铁尾矿深度还原-磁选工艺的二次多项式模型,试验以磁选铁精矿的品位为响应值作响应面和等高线值,研究了不同试验条件对铁精矿品位的影响。结果表明,基于Box-Behnken试验设计的响应面分析及模型拟合所得参数可靠,在配碳量为21.5%,碳酸钠用量14.1%,焙烧温度1278℃,保温时间125 min,-0.037 mm含量为86%和磁场强度260 m T为时,可获得品位为90.86%,回收率为81.35%的最终选别指标。展开更多
文摘The catalytic performance of Mo supported on hierarchical alumina–silica(Si/Al = 15) with Mo loadings of 3, 6 and 15 wt% was investigated for the oxidative desulfurization(ODS) of model and real oil samples. Hierarchical alumina–silica(h Al–Si) was synthesized by economical and ecofriendly silicate-1 seed-induced route using cetyltrimethylammonium bromide(CTAB) as mesoporogen. The effect of CTAB on the structure of catalyst was studied by characterization techniques. The results revealed that 6%Mo/h Al–Si had the highest sulfur removal compared to the other catalyst loadings. The effect of operating parameters was evaluated using Box–Behnken experimental design. The optimal desulfurization conditions with the 6%Mo/h Al–Si catalyst were determined at oxidation temperature of 67 ℃, oxidation time of 42 min, H2O2/S molar ratio of 8 and catalyst dosage of 0.008 g·ml^-1 for achieving a conversion of 95%. Under optimal conditions, different sulfur-containing compounds with initial concentration of 1000 ppm, Dibenzothiophene(DBT), Benzothiophene(BT) and Thiophen(Th), showed the catalytic oxidation reactivity in the order of DBT > BT>Th. According to the regeneration experiments, the 6%Mo/h Al–Si catalyst was reused 4 times with a little reduction in the performance. Also, the total sulfur content of gasoline and diesel after ODS process reached 156.6 and 4592.2 ppm, respectively.
文摘根据Box-Behnken中心组合试验设计原理,在条件试验基础上,采用六因素三水平的响应曲面分析法,建立了柞水菱铁尾矿深度还原-磁选工艺的二次多项式模型,试验以磁选铁精矿的品位为响应值作响应面和等高线值,研究了不同试验条件对铁精矿品位的影响。结果表明,基于Box-Behnken试验设计的响应面分析及模型拟合所得参数可靠,在配碳量为21.5%,碳酸钠用量14.1%,焙烧温度1278℃,保温时间125 min,-0.037 mm含量为86%和磁场强度260 m T为时,可获得品位为90.86%,回收率为81.35%的最终选别指标。
