催化剂和供氢剂对渣油模型化合物裂化反应选择性的影响

供氢剂与分散性催化剂协同作用对于传统的煤液化体系和渣油加氢裂化体系非常重要。通过活化分子氢及煤分子，使液化反应在较低的温度下进行以减少副反应，继而提高氢转移效率，增加液体产物产率。供氢剂和催化剂起促进煤分子裂化的作用。将供氢剂与催化剂的协同作用应用于渣油加

EFFECTS OF DISPERSED CATALYST AND HYDROGEN DONOR ON THE SELECTIVITY OF CRACKING REACTION OF MODEL COMPOUNDS FOR RESIDUE OIL

The effects of dispersed catalyst and hydrogen donor on the cracking and cracking selectivity of characteristic model compounds in residue oil, such as N-eicosane, butyl benzene and 1,6-diphenylheptane, were investigated in the thermal, hydrothermal and catalytic hydrocracking systems at 440 ℃. The three compounds had different cracking characteristics. N-eicosane had the simplest bond-scission way. The bond-scissions of butyl benzene in the thermal system were mainly β- and γ- bond-scission, while β- in hydrothermal and α- bond-scission in catalytic hydrocracking were main reactions. 1,6-diphenylheptane had more complex cracking ways, which were α-, β-, homolysis and γ-bond-scission. The bond-scissions of 1,6-diphenylheptane in thermal cracking underwent such four ways, how-ever, α- and β-bond-scission or α-bond-scission were main reactions in hydrothermal or in catalytic hydrocracking of 1,6-diphenylheptane, respectively. It seems that these three model compounds experienced the radical reaction in the single systems of model compounds or in the binary system of model compounds/tetralin for thermal, hydrothermal and catalytic hydrocracking. Molecular hydrogen as well as dispersed catalyst enhanced the cracking of model compounds, while H-donor depressed the cracking. For cracking selectivity of the three compounds, thermal and hydrothermal cracking were the basis of other processes and dispersed catalysts clearly affected the cracking selectivity of alkyl aromatics. On the other hand, hydrogen donor had influence on a certain extent on the cracking selectivity on the basis of the thermal, hydrothermal and catalytic hydrocracking systems.