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制备了以γ-Al2O3为载体的镍基双金属选择性加氢催化剂,并用于催化裂化轻汽油的选择性加氢反应。考察了载体焙烧温度、金属镍与镁的负载量对催化剂选择性加氢性能的影响。结果表明,适当高的焙烧温度降低了催化剂的比表面积和表面酸性,提高了催化剂的稳定性。助剂镁的加入有利于活性组分Ni的均匀分散,并进一步降低催化剂的表面酸性。在反应温度80℃、空速10h-1、氢油体积比为10、压力1 5MPa的条件下,采用NI:(10%)-Mg(1 5%)/AL2O3催化剂,催化裂化轻汽油中二烯烃转化率达到98%以上。制备的选择性加氢催化剂具有良好的活性和选择性,可望在选择性加氢领域获得应用。
Ni-based bimetallic selective hydrogenation catalyst with γ-Al2O3 as support was prepared and used for selective hydrogenation of FCC light gasoline. The effect of catalyst calcination temperature, nickel metal loading and magnesium loading on the selectivity of catalysts was investigated. The results showed that proper calcination temperature decreased the specific surface area and surface acidity of the catalyst and improved the stability of the catalyst. The addition of auxiliary magnesium is conducive to the uniform dispersion of the active component Ni and further reduces the surface acidity of the catalyst. Under the conditions of reaction temperature of 80 ℃, space velocity of 10h-1, volume ratio of hydrogen to oil of 10 and pressure of 15MPa, Ni (Ⅱ) Olefin conversion rate of more than 98%. The prepared selective hydrogenation catalyst has good activity and selectivity and is expected to be applied in the field of selective hydrogenation.