Using steady isotope labeled tetralin and naphthalene, the mechanism of thermal cracking, hydro cracking and catalytic hydro cracking reaction of hydrogen donors and n eicosane is studied It is found that the effe...Using steady isotope labeled tetralin and naphthalene, the mechanism of thermal cracking, hydro cracking and catalytic hydro cracking reaction of hydrogen donors and n eicosane is studied It is found that the effect of hydrogen donor is inhibition of cracking reaction and the dehydrogenation of tetralin is stepwise and the α hydrogen of naphthenic ring is easier to dehydrogenated than the β hydrogen The ratio of dehydrogenation selectivity of α hydrogen and β hydrogen exhibits in this order: thermal cracking>hydro cracking >catalytic hydrocracking The reaction in the binary system of n eicosane and dueterated naphthalene shows that there is no tetralin in the thermal cracking system of n eicosane and dueterated naphthalene and there is a little tetralin in the hydro cracking system of n eicosane and dueterated naphthalene, however, there are remarkable tetralin in the catalytic hydro cracking reaction of n eicosane and dueterated naphthalene The MS analysis of recovered nC 20 in catalytic hydrocracking system, which is different from the MS analysis in thermal cracking and hydro cracking system, demonstrates that the inhibition cracking of n eicosane by tetralin is ascribed to the dehydrogenation of tetralin for scavenging the展开更多
文摘Using steady isotope labeled tetralin and naphthalene, the mechanism of thermal cracking, hydro cracking and catalytic hydro cracking reaction of hydrogen donors and n eicosane is studied It is found that the effect of hydrogen donor is inhibition of cracking reaction and the dehydrogenation of tetralin is stepwise and the α hydrogen of naphthenic ring is easier to dehydrogenated than the β hydrogen The ratio of dehydrogenation selectivity of α hydrogen and β hydrogen exhibits in this order: thermal cracking>hydro cracking >catalytic hydrocracking The reaction in the binary system of n eicosane and dueterated naphthalene shows that there is no tetralin in the thermal cracking system of n eicosane and dueterated naphthalene and there is a little tetralin in the hydro cracking system of n eicosane and dueterated naphthalene, however, there are remarkable tetralin in the catalytic hydro cracking reaction of n eicosane and dueterated naphthalene The MS analysis of recovered nC 20 in catalytic hydrocracking system, which is different from the MS analysis in thermal cracking and hydro cracking system, demonstrates that the inhibition cracking of n eicosane by tetralin is ascribed to the dehydrogenation of tetralin for scavenging the
