硫化物在OTA催化剂上催化转化性能

考察了催化裂化(FCC)汽油中硫化物和模型硫化物在OTA(Olefin To Aromatics)催化剂上的催化转化性能.结果表明FCC汽油硫化物总脱硫率为86.3 %,其中,硫醚和四氢噻吩的转化率都达到100 %,硫醇硫转化率96.6 %,噻吩硫转化率78.8 %,烷基噻吩转化率85.8 %,苯并噻吩转化率81.4 %.3-甲基噻吩在OTA催化剂上的转化产物中含有小分子(噻吩),异构硫化物(2-甲基噻吩),以及大分子异构硫化物(如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OTA催化剂上脱硫反应网络一方面含有直接加氢脱硫反应,另一方面经历歧化、异构化和裂解等反应.

Catalytic Transformation Performance of Sulfides on OTA Catalyst

The catalytic transformation performances of model sulfur-containing compounds and FCC gasoline on OTA(Olefin To Aromatics) catalyst were evaluated.The results indicated that the total hydrodesulfurization ratio of sulfur-containing compounds of FCC gasoline was 86.3 %,sulfide and tetrahydrothiophene were completely conversed,the hydrodesulfurization ratio of mercaptans was 96.6 %,the hydrodesulfurization ratio of thiophene was 78.8 %,the hydrodesulfurization ratio of alkyl-substituted thiophene was 85.8 %,the hydrodesulfurization ratio of benzothiophene was 81.4 %.The conversed products of 3-methylthiophene were including little sulfur specie(thiophene),isomerized sulfur specie(2-methylthiophene) and larger sulfur specie(2,5-dimethylthiophene,2,4-dimethylthiophene,2,3dimethylthiophene).The desulfurization networks of alkylthiophenes and benzothiophene on OTA catalyst were involving both and direct hydrodesulfurization,but also,containing disproportionation,isomerization.and cracking.