The first commercial application of FHUDS-3 hydrofining catalyst newly developed by Fushun Research Institute of Petroleum and Petrochemicals was carried out at the 3. 0 Mt/a diesel hydrofining unit of SINOPEC Shanghai Gaoqiao Petrochemical Corporation. The operations of nearly three years showed that FHUDS-3 catalyst possessed high activity, good selectivity and adaptability to various feedstocks, thus, it processed various mixed diesel feedstocks to produce low-sulfur clean diesel meeting the requirements of National Exhaust Emission Standard Ⅲ and Shanghai Exhaust Emission Standard Ⅵ. Nevertheless, after running 26 months, the catalyst activity showed a significant decline trend. By analyzing the spent catalyst, it was found that the serious deactivation of catalyst was caused by the deposition of silicon on the catalyst surface, which reduced the pore volume and specific surface area of the catalyst, covered some active sites and led to catalyst deactivation finally. However, the silicon deposits came from coker distillate in the mixed feedstock due to the use of defoaming agent containing organic silicon at the upstream delayed coking unit.%中国石化上海高桥分公司3.0 Mt/a柴油加氢精制装置采用中国石化抚顺石油化工研究院开发的新一代FHUDS-3加氢精制催化剂,近三年的运行结果表明,FHUDS-3催化剂的加氢选择性好、活性高、原料适应性强,可以满足工业装置加工处理各类混合柴油的要求,能够稳定生产硫含量满足国Ⅲ和沪Ⅳ排放标准的清洁柴油.但在装置运行26个月后出现催化剂失活现象,对卸出催化剂进行分析,找出催化剂失活的原因,主要是由于上游焦化装置使用含硅消泡剂,使柴油加氢精制装置原料焦化汽油、柴油中含有有机硅,硅的沉积致使催化剂孔体积和比表面积降低,活性中心被覆盖,最终导致FHUDS-3催化剂中毒失活.
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