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采用等体积浸渍法制备氧化铝基铜吸附剂,以柴油考察制备条件和吸附脱硫工艺条件对吸附剂脱硫性能的影响,并通过XRD和N2吸附-脱附等方法对其进行表征。表征结果显示,铜负载量4%(w)(按CuO计)己达到氧化铝负载硝酸铜单分子层最大分散量。实验结果表明,氧化铝基铜吸附剂的较佳制备条件为:载体采用乙酸溶液浸泡处理,氮气中于450℃下焙烧4h;吸附脱硫工艺条件为:吸附温度60℃,WHSV=1.0 h-1,铜负载量2%(w)。在此条件下,吸附剂总脱硫率为66.4%,其中各种硫化物的脱硫率分别为:噻吩类硫化物100.0%、甲基苯并噻吩85.1%、C2-苯并噻吩51.2%、多烷基苯并噻吩9.6%、二苯并噻吩81.0%、甲基二苯并噻吩77.9%、C2-二苯并噻吩74.8%、多烷基二苯并噻吩69.9%。 相似文献
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烯丙醇在Ti-MWW催化剂上的环氧化反应 总被引:1,自引:0,他引:1
以水热合成-酸处理法制得的T i-MWW分子筛为催化剂,研究了烯丙醇(AAL)和H2O2在水中的环氧化反应,考察了反应条件对AAL的转化率和环氧丙醇(GLY)选择性的影响。实验结果表明,AAL的浓度较低时有利于反应的进行,高浓度的H2O2则降低GLY的选择性,n(AAL)∶n(H2O2)=1时,GLY的选择性最高;当反应温度高于333K时,GLY的选择性随反应温度升高明显下降。当T i-MWW催化剂用量为50m g、AAL和H2O2的用量均为10mm ol、水量为20mL时,在333K下反应30m in,AAL的转化率达到96%,同时GLY的选择性可达98%以上。该反应的机理与TS-1催化剂催化烯烃环氧化反应类似,AAL和溶剂在活性位上存在竞争吸附。GLY的高选择性归因于T i-MWW催化剂中T i活性位与水、H2O2形成的五元环过渡态。 相似文献
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Multiple-metal catalysts (Ni-Mn-Ce-K/bauxite) for Water-Gas Shift (WGS) reaction were prepared by impregnation, and the catalytic structure and properties were investigated by N2 physical, XRD, H2-TPR, and CO-TPD. The results indicated that the addition of 7.5% CeO2 improved the activity of the WGS reaction obviously, and also increased the specific surface area and pore volume of the catalysts. The addition of CeO2 decreases the reduction temperature, enhanced the adsorption and activation of H2O, and improved the adsorption content of CO. Besides, active sites were not changed and the number of active sites on catalysts did not increase obviously. 相似文献