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采用分步浸渍法制备了MgO-Al2O3负载的Ni基催化剂,并运用N2吸附、X射线衍射(XRD)、透射电子显微镜(TEM)等手段进行表征.该催化剂用于甲苯或萘为焦油模拟化合物的高温焦炉煤气(COG)的常压加氢裂解反应,并考察了H2浓度、H2S对催化剂活性的影响.结果表明:催化剂还原后,表面形成均匀分散、直径为8-14nm的金属Ni纳米颗粒;在较低的水碳摩尔比(nH2O/nC=0.28)时,甲苯就能完全转化并选择性地加氢裂解形成CH4,测试的时间内(480min),催化剂没有明显的失活和积炭现象,显示出好的反应活性、稳定性和耐硫能力.制得的Ni/MgO-Al2O3催化剂有望应用于较低水含量(10%-15%(φ,体积分数))的高温焦炉煤气中焦油的直接转化.
The Ni-based catalyst supported on MgO-Al2O3 was prepared by step impregnation method and characterized by N2 adsorption, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The catalyst was used as a tar analogue compound Atmospheric pressure hydrocracking reaction of high temperature coke oven gas (COG) was carried out, and the effects of H2 concentration and H2S on the activity of the catalyst were investigated.The results showed that after the catalyst was reduced, the surface was uniformly dispersed with a diameter of 8-14nm of Ni At the lower molar ratio of water to carbon (nH2O / nC = 0.28), toluene could be fully converted and selectively hydrocracked to form CH4. During the test period (480 min), there was no obvious deactivation and accumulation of catalyst The results show that the Ni / MgO-Al2O3 catalyst is suitable for high temperature coke oven with low water content (10% -15% (φ, volume fraction)) Direct conversion of tar in gas.