摘要
采用草酸对NaY分子筛进行脱铝,然后用经过脱铝的NaY分子筛与硝酸铈溶液进行液相离子交换,经过焙烧制得Ce(Ⅳ)Y分子筛。在室温(25℃)、剂油比为1∶3、吸附时间为6h的条件下,用Ce(Ⅳ)Y和NaY分子筛对FCC汽油(硫含量为135μg/g)进行静态吸附脱硫,利用微库仑综合分析仪对吸附剂处理过的FCC汽油进行硫含量的测定,结果表明经过改性的Ce(Ⅳ)Y分子筛脱硫率为85.1%,比NaY分子筛的脱硫率高34.4个百分点。利用频率响应仪(FR)和智能重量分析仪(IGA)研究了Ce(Ⅳ)Y分子筛与噻吩类硫化物的作用机理。结果表明:Ce(Ⅳ)Y分子筛不但能够脱除噻吩、2-甲基噻吩、3-甲基噻吩、四氢噻吩等硫化物,而且能够脱除一部分NaY分子筛较难脱除的二甲基类噻吩硫化物,噻吩与Ce(Ⅳ)Y分子筛之间形成的稳定的化学键是S-M(σ)键和π络合的共同作用。
Ce （Ⅳ）Y zeolite is produced through several procedures-dealuminization of NaY zeolite by oxalic acid;liquid-phase ion exchange between dealuminized NaY zeolite and cerous nitrate solution ;burning.Researchers conducted a static absorption desulfurization test on FCC gasoline with a sulfur content of 135μg/g using Ce（Ⅳ）Y and NaY zeolite at room temperature（25℃）.The catalyst-oil ratio in the test was 1∶3 and the absorption duration was 6 hours.They then used a Microcoulometry Analyzer to measure the content of sulfur in the FCC gasoline treated with absorbent.The measurement results show that the desulfurizing rate of modified Ce （Ⅳ）Y zeolite is 85.1%,34.4 percentage points higher than that of NaY zeolite.These researchers also studied how Ce（Ⅳ）Y zeolite acted with thiophene sulfides using a frequency response analyzer and an intelligent gravimetric analyzer.The analysis showed that Ce （Ⅳ）Y can not only remove sulfides such as thiophene,2-methylthiophene,3-methylthiophene and tetrahydrothiophene but can also remove some dimethyl thiophene sulfides that cannot be removed by NaY zeolite and that the stable chemical bond formed between thiophene and Ce（Ⅳ）Y is a result of complexation of S-M（σ） and π bonds.
出处
《中外能源》
CAS
2010年第9期89-93,共5页
Sino-Global Energy
