摘要
合成了不同Cu/Si比(Ce/Si比皆为0.01)的Cu/Ce-MCM-41分子筛,用于在常温常压下吸附汽油模拟溶液中的含硫化合物,结果显示吸附剂中脱硫能力最好的是Cu/Si比为0.02的吸附剂。XRD、FT-IR、比表面测定等表征结果表明,样品具有MCM-41典型的规整有序的孔道结构,并且合成的特定阶段加入超声作用,可以优化其结构从而提高脱硫率。适宜的吸附条件为常温常压吸附,剂油比为0.019,吸附时间为2 h。另外,该吸附剂对分子尺寸较大的二苯并噻吩也有较好的脱硫效果,而且经过高温焙烧再生后,仍具有较高的脱硫容量。在芳香化合物竞争吸附的体系中,Cu/Ce-MCM-41仍然具有较好的选择吸附性能,说明所掺杂的金属离子之间可能形成了协同作用,从而使吸附剂同时拥有了较高的脱硫容量和选择性。
Cu/Ce-MCM-41 molecular sieve adsorbents with the different Cu/Si and same Ce/Si ratios were synthesized by direct insertion of metal ion as a precursor and used for desulfurization of sulfur-containing compounds ( thiophene,dibenzothiophene ) in the model gasoline solution ( MS ). It was found that Cu/Ce-MCM-41 ( Cu/Si = 0. 02,Ce/Si =0.01) had better structural properties and desulfurization capacity. The adsorption performance of the adsorbents was investigated at suitable condition: the best adsorbent to oil ratio was 0.019 for thiophene adsorption on Cu/ Ce-MCM-41,and the adsorption could reach equilibrium in 2 hours at room temperature under atmospheric pressure. Further analysis using XRD and FT-IR reflected that the adsorbents were well-ordered MCM -41-type materials, and the addition of ultrasonic in the process of synthesis could obtain the better structural properties and desulfurization capacity. In addition, Cu/Ce-MCM -41 was found to have synergistic effect on adsorption capacity and selectivity at the appearance of toluene. There was good recovery of the adsorption capacity after the regeneration of a spent Cu-Ce-MCM -41 sample.
出处
《石油与天然气化工》
CAS
CSCD
北大核心
2008年第4期279-284,共6页
Chemical engineering of oil & gas
关键词
吸附
脱硫
MCM-41
分子筛
噻吩
二苯并噻吩
甲苯
CU
Ce
adsorption, desulfuration, MCM -41, molecular sieve, thiophene, dibenzothiophene, toluene,Cu,Ce
