摘要
采用孔饱和浸渍法,以-γAl2O3、B-Al2O3、F-Al2O3、SiO2-Al2O3为载体制备了系列Ni-W加氢处理催化剂。采用程序升温还原(TPR)、X射线光电子能谱(XPS)、高分辨透射电镜(HRTEM)等手段对催化剂进行了表征。以质量分数10%的四氢萘+正庚烷(原料A)和含S 750μg/g、N 250μg/g的10%四氢萘+正庚烷(原料ASN)两种反应油对催化剂进行活性评价,用拟一级动力学方程计算反应速率常数,并以四氢萘裂化速率常数表示催化剂相对酸性。结果表明,削弱金属与载体的相互作用(MSI),可提高金属组分的硫化度,但同时也降低了金属组分的分散度,这说明MSI对活性相的影响具有正负两面性。Ni-W系列催化剂对原料A或ASN的四氢萘加氢活性与TPR、XPS、HRTEM表征结果之间没有直接的对应关系,而催化剂对原料ASN的四氢萘加氢活性和对原料A的裂化活性之间有较好的对应,表明调节载体的表面酸性有利于减轻S、N对四氢萘加氢的抑制作用。
Different Ni-W catalysts with the same metal loading supported on γ-Al2O3, B-Al2O3, F-Al2O3, SiO2-Al2O3 were prepared by wet impregnation method. The catalysts were characterized by temperature programmed reduction （ TPR ）, X-ray photoelectronspectrocscopy （XPS）, and high resolution electron microscopy （HRTEM） to investigate the effect of supports on active phase. It was found that weaker metal-support interaction would lead to higher sulfiding degree of metals and lower dispersity at the same time. The aromatic hydrogenation activity of obtained catalyst was evaluated by two feeds with tetralin as model compound and n-heptane as solvent, one contained 10% （mass fraction） tetralin （Sample A） and the other one was 10% tetralin with 750 μg/g S and 250 μg/g N （Sample ASN）. Reaction rate constants were calculated by pseudo first order reaction kinetic equation. The relative acidity of catalyst was related with its hydrocracking activity. For these two feeds above mentioned, the hydrogenation activity of tetralin on different catalysts had no direct correlation with TPR, XPS, or HRTEM results. For feed ASN, the hydrogenation activity of the catalyst was associated with its hydrocracking activity for feed A, which showed that the adjustment of acidity could reduce the inhibition of S and N on tetralin hydrogenation activity of catalyst.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2006年第6期69-75,共7页
Acta Petrolei Sinica(Petroleum Processing Section)
作者简介
李洪宝（1975-），男，博士研究生，从事加氯催化剂研究；通讯联系人：李洪宝，Tel：010-82368324；E-mail：lihb@ripp-sinopec．com.
黄卫国（1970-），男，高级工程师，博士，从事加氯催化剂研究；
康小洪（1943-），男，教授级高级工程师，硕士，从事加氢技术研究；
石亚华（1941-），女，教授级高级工程师，从事加氢技术研究。
