FCC汽油硫化物在ZSM-5催化剂上的加氢脱硫路径

 采用气相色谱-原子发射光谱(GC-AED)方法,考察了催化裂化(FCC)汽油中的硫化物和相应模型硫化物在ZSM-5催化剂上的催化转化性能.结果表明, FCC汽油硫化物总转化率为86.3%, 其中,硫醚和四氢噻吩的转化率都达到100%, 硫醇、噻吩、烷基噻吩和苯并噻吩的转化率分别为96.6%、78.8%、85.8%和81.4%. 3-甲基噻吩在ZSM-5催化剂上的转化产物中含有噻吩、2-甲基噻吩、2,5-二甲基噻吩、2,4-二甲基噻吩和2,3-二甲基噻吩.烷基噻吩和苯并噻吩硫化物在ZSM-5催化剂上脱硫反应网络中, 一方面含有直接加氢脱硫反应, 另一方面含有包括歧化、异构化和裂解等反应的间接加氢脱硫反应.

THE HYDRODESULFURIZATION PATHS OF FCC GASOLINE SULFIDES ON ZSM-5 CATALYST

The catalytic transformation performances of FCC gasoline and relative model sulfur-containing compounds on ZSM-5 catalyst were evaluated by gas chromatography-atomic emission detector(GC-AED). The results indicated that the total conversion of sulfur-containing compounds of FCC gasoline was 86.3% in the catalytic transformation. Among the sulfur-containing compounds of FCC gasoline, thioether and tetrahydrothiophene were completely converted, the conversions of mercaptans, thiophene, alkyl-thiophene and benzothiophene were 96.6%, 78.8%, 85.8%, and 81.4%, respectively. The converted products of 3-methylthiophene included thiophene, 2-methylthiophene, 2,5-dimethylthiophene, 2,4-dimethylthiophene and 2,3-dimethylthiophene. The desulfurization paths of alkylthiophenes and benzothiophene on ZSM-5 catalyst involved both the direct path of hydrodesulfurization and the indirect path containing disproportionation, isomerization and cracking.