So as to explore the catalytic activity using co-impregnation, the
Ni/MCM-41 sample with Ni/EG = 1:1 was comparatively investigated
in the naphthalene hydrogenation with the catalyst by conventional
wetness impregnation. The reaction conditions and product distribution
were shown in Table 2. The naphthalene hydrogenation occurred
in two sequential steps: the conversion to tetralin first by hydrogenation
of one ring, followed by the formation of decalin via hydrogenation of the second ring [17,20]. The main products were tetralin, trans-decalin
and cis-decalin, and no hydrocracking product was observed.