Abstract: MgO/γ-Al2O3 catalysts were prepared by incipient wetness impregnation with γ-Al2O3  and Mg（NO3）2·6H2O as raw materials.XRD results showed that the position of characteristic diffraction peaks shifted to the low-angle direction，indica- ting the formation of MgAl2O4 phase on the surface of the γ-Al2O3  support.The regeneration reaction of degradation products （DP） and the transformation property of 2-ethyl-5，6，7，8-tetrahydro-9，10-anthrahydroquinone（H4EAQ） over MgO/γ- Al2O3  catalysts were carried out at atmospheric pressure and 50 ℃.The MgO/γ-Al2O3  catalysts exhibited the higher catalytic activity than γ-Al2O3 .The amounts of DP regeneration and H4EAQ transformation increased with increasing the MgO loading mass in MgO/Al2O3 catalysts and both they reached the maximum at the MgO mass fraction of 30%，together with the improvement in the DP regeneration and H4EAQ transformation of 54% and 231%，respectively，compared with γ-Al2O3 .

Key words: anthraquinone process；hydrogen peroxide；regeneration；degradation products；MgO/&gamma, -Al2O3