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为满足环保要求,针对催化裂化汽油烯烃含量较高的问题,研究了一种非加氢降烯烃催化剂。在小型固定床上,考察了催化剂性质和反应条件等对FCC汽油烯烃含量的影响,确定了降烯烃非加氢工艺的最佳工艺条件。研究结果表明,在以氧化铝为担体,过渡金属为活性组分,反应温度为110℃,反应压力为0.3 MPa,体积空速为2.6 h-1条件下,FCC汽油降烯烃反应后,苯的体积分数小于2.5%,芳烃的体积分数有所升高但小于40%,烯烃体积分数由原来的55%下降至30%(荧光法),满足国家汽油新标准要求。同时测定产品油的辛烷值(RON)为95,克服了以往加氢带来的辛烷值降低的缺点。
In order to meet the environmental requirements, aiming at the problem of high olefins content in FCC gasoline, a non-hydrogenation and olefin reduction catalyst was studied. In a small fixed bed, the effect of catalyst properties and reaction conditions on the olefin content of FCC gasoline was investigated, and the optimum process conditions for olefin reduction were determined. The results show that under the conditions of alumina as support, transition metal as active component, reaction temperature of 110 ℃, reaction pressure of 0.3 MPa and volume space velocity of 2.6 h-1, Volume fraction of less than 2.5%, the volume fraction of aromatics increased but less than 40%, the volume fraction of olefins decreased from 55% to 30% (fluorescence method), to meet the requirements of the new national gasoline standards. At the same time, the product oil octane number (RON) is 95, which overcomes the shortcoming of octane decrease caused by hydrogenation in the past.