摘要:
以碳酸镁为原料,三乙醇胺和Ⅳ,Ⅳ’-二甲基甲酰胺为助溶剂,制备了水溶性镁基钝化剂.在微反装置上,对浸渍镁基钝化剂后LDO-75催化剂(镍负载量为10 mg/g)微反活性进行了评价;同时,在小型固定流化床装置上,对钝化剂的钝化效果也进行了评价.结果表明:以大港轻柴油为原料,在700°C,100%水蒸气老化4h的条件下,当Mg/Ni(摩尔比)为1.0时,钝化后催化剂的微反活性较空白试样提高了约5个百分点;以重油为原料,在反应温度为500°C,空速为15 h-1,催化剂/原料油(质量比)为4的条件下,采用镁基钝化剂处理过的催化剂,与空白试样相比,产物氢气和焦炭收率分别降低了0.02,2.13个百分点;镁基钝化剂能够有效抑制镍对催化剂的污染.%The water-soluble magnesium-based passivator was prepared with magnesium carbonate as raw material,triethanolamine and N,N'-dimethyl-formamide as cosolvents.The micro-activity of LDO-75 catalyst (nickel loading 10 mg/g) with dipping magnesium-based passivator was evaluated in a micro-reaction unit.The passivation effect was evaluated in a small fixed fluidized bed device.The results showed that compared with blank sample,the micro-activity of passivated catalyst (Mg to Ni mole ratio 1.0) increased about 5 percent points with Dagang light diesel oil as raw material under the condition of 100% steam aging at 700 °C for 4 h.Compared with the non-treated catalyst,the yield of hydrogen and coke in product reduced by 0.02,2.13 percent points respectively with heavy oil as raw material under the conditions of reaction temperature 500 °C,space velocity 15 h-1,catalyst to feedstock (mass ratio) 4.The magnesium-based passivator could be effectively inhibited the pollution of Ni.