摘要
甲基叔丁基醚(MTBE)是我国汽油中一种重要的调和组分。降低MTBE产品中硫化物含量,可促进汽油的清洁燃烧和环境保护。采用MTBE为溶剂分别配制了以二甲基二硫醚(DMDS)、甲基叔丁基硫醚(TBMS)为模型硫化物的含硫MTBE产品样品。脱硫剂由Pd/C、异丙醇、氢氧化钠和去离子水组成。首先,采用N2吸附等温线、TEM、XRD对Pd/C结构特征进行了表征。结果显示,Pd/C的比表面积为1 836m^2/g,孔容为0.98cm^3/g,根据其I型吸附等温线可知,其绝大部分孔为微孔。由Pd/C的TEM图可以看出,Pd的纳米颗粒比较均匀地分布于活性炭材料上,Pd金属纳米粒子直径约3~5nm。XRD图显示Pd纳米晶体颗粒的(111)、(200)、(220)和(311)典型晶面存在。脱硫实验结果显示,采用间歇反应器在50℃下,脱硫剂可在1h内将MTBE产品中的硫质量分数从150μg/g降至10μg/g以下,从而得到低含硫MTBE产品,脱硫剂的脱硫效果得到较好的验证。Pd/C既作为原位产生过氧化氢的催化剂,又是吸附砜类硫化物的吸附剂,洗脱再生后仍具有较好的催化和脱硫性能。
Methyl tert-butyl ether （MTBE） is an important blending component of gasoline in China. Reducing the sulfur compounds contents in MTBE products can promote clean burning of gasoline and environmental protection. The MTBE products samples containing sulfur compounds were prepared with dimethyl disulfide （DMDS） and tert-butyl methyl sulfide （TBMS） using MTBE as solvents, respectively. The desulfurizer was composed of Pd/C, isopropanol,sodium hydroxide and deionized water. The Pd/C structure characteristics was characterized by N2 adsorption isotherm, TEM and XRD. The feature of type I isotherm confirmed that the existence of micropores in Pd/C catalyst and the BET surface area of Pd/C was 1 836 m^2/g and the pore volume was 0. 98 cm^3/g,respectively. According to the adsorption isotherm, it could be concluded that most of the pores are micropores. The average particle size of Pd crystal particle shown in TEM images was about 3 - 5 nm and the crystal particles of Pd were distributed uniformly in activated carbon which could strengthen the catalytic efficiency and result in strong combination between Pd and activated carbon. Four typical diffraction peaks of Pd indicated the existence of the crystal faces （111）, （200） , （220） and （311） in the XRD patterns. By using batch reactor, the sulfur mass fraction in MTBE products could be reduced from 150 jug/g to below 10 μg/g in one hour at 50℃ and ultra-low sulfur MTBE products could be obtained. The desulfurization effect of desulfurizer was verified. The Pd/C was used as both the catalyst for producing hydrogen peroxide and the adsorbent removing sulfurs from MTBE products. It still had high catalytic and desulfurization performance after being eluted and regenerated.
出处
《石油与天然气化工》
CAS
北大核心
2017年第1期8-11,共4页
Chemical engineering of oil & gas
基金
国家自然科学基金(缩聚反应/吸附法深度脱除燃油中咔唑类氮化物研究)"21006053"
南开大学2015年校级教学改革项目(以创新研究与训练为导向的公选课课程建设研究)"ZB160052"
天津市教育系统调研课题项目(校企合作育人调研项目)"普通课题14"
