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摘要: 以噻吩代表汽油中的有机硫化合物，将其溶解于正辛烷配制成反应原料，考察了活性炭对噻吩的吸附脱硫情况，研究了质量分数为30％的过氧化氢水溶液为氧化剂，在活性炭和甲酸的催化作用下，反应原料中噻吩氧化脱硫。考察了活性炭的催化性能及反应条件对其催化性能的影响。实验结果表明，30％H2O2-HCOOH-AC（活性炭）三元体系产生的过氧甲酸和羟基自由基能将模型有机硫化合物氧化，噻吩的氧化脱硫率可达到85％以上；活性炭和甲酸的催化氧化性能明显优于单纯使用甲酸催化性能。甲酸浓度、活性炭加入量、过氧化氢初始浓度及温度对噻吩硫的氧化脱除均有影响。Abstract: Reaction feed was prepared as follows: thiophene selected as model organosulfur compound in gasoline was dissolved in n-octane. The adsorption of thiophene in n-octane by activated carbon was investigated. The oxidant was 30% aqueous solution of hydrogen peroxide. Oxidative desulfurization with 30 % H2O2 in the presence of the activated carbon and formic acid was studied. Catalytic performance of the activated carbon and the effect of reaction conditions on oxidative removal of thiophene were investigated. Experimental results indicated that performic acid and hydroxyl radical produced in situ are coupled to oxidize model organosulfur compound with desulfurization ratio of over 85%. Catalytic performance of the combination of activated carbon and formic acid is higher than that of only formic acid. Formic acid concentration, activated carbon dosage and initial hydrogen peroxide concentration, reaction temperature affect the oxidative removal of thiophene.
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Key words:
- activated carbon /
- formic acid /
- 30％H2O2 /
- thiophene /
- oxdative desulfurization
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