Abstract: A study on the desulfurization of oil by catalytic oxidation in emulsion system with hydrogen peroxide as oxidant has been conducted，where the phosphotungstic acid alkyl betaine was used as a phase transfer catalyst. It investigated the catalytic properties of phosphotungstic acid C14 alky betaine，phosphotungstic acid C16 alky betaine and phosphotungstic acid C18 alky betaine. Influences of the amount of catalyst，reaction time，emulsion mixing speed and n(oxygen)/n(sulfur) on oil desulfurization were also tested. The results indicated that the longer the chain of the alkyl betaine，the better the catalytic effect. The ratio of n(oxygen)/n(sulfur) was 11，the desulfurization rate was up to 91.23% when the amount of catalyst was 0.003（the mass ratio of catalyst and model oil），reaction time was 8 minutes，and the emulsion mixing speed was 2500r/min.

Key words: desulfurization, catalytic oxidation, phosphotungstic acid, alkyl betaine, fuel oil

摘要： 以磷钨酸烷基甜菜碱为相转移催化剂，双氧水为氧化剂，在乳液体系下，催化氧化脱除燃料油中的硫化物，研究了磷钨酸十四烷基二甲基甜菜碱、磷钨酸十六烷基二甲基甜菜碱以及磷钨酸十八烷基二甲基甜菜碱的催化性能，考察了催化剂用量、制乳时间、制乳转速以及氧硫比对脱硫效果的影响。结果表明，烷基甜菜碱的烷基链越长，催化效果越好；在催化剂的用量为0.003（剂油比）、制乳时间8min、制乳转速2500r/min、氧硫比为11的条件下，脱硫率可达到91.23%。

关键词: 脱硫, 催化氧化, 磷钨酸, 烷基甜菜碱, 燃料油