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ABSTRACT In this paper, based on the analysis of oil sludge composition and environmental hazards, the microwave catalytic pyrolysis of oil sludge for recovering combustible gas and chain hydrocarbon light oil disposal process, is proposed to perform the recycling of oil sludge and reduce the risk of environmental pollution. In order to improve the yield of combustible gas and light oil in oil sludge pyrolysis, the impact of adding four catalysts (nano-CuO, nano-NiO, nano-MgO, and nano-γ-Al2O3) on the heating characteristics of oil sludge and the composition and quality of products during microwave pyrolysis, were experimentally studied and analyzed. The results show that the catalyst can increase the heating rate of sludge and the yield of pyrolysis oil and gas. The increasing order of heating is: nano-CuO > nano-γ-Al2O3 > nano-MgO > nano-NiO > blank group. Compared with the blank group, the content of combustible gas (H2 + CH4 + CO) increases by 18.824wt% (MgO), 4.511wt% (CuO), 9.28wt% (NiO), and 16.164wt% (γ-Al2O3), respectively. It can be deduced that nano-metal oxide catalysts, especially γ-Al2O3, can promote the decomposition of oil sludge, improve the content of low carbon straight chain hydrocarbons and alcohols, and improve the quality of pyrolysis oil products. paper hazards process pollution nanoCuO, nanoCuO nano CuO, CuO (nano-CuO nanoNiO, nanoNiO NiO, NiO nanoMgO, nanoMgO MgO, MgO nanoγAl2O3 nanoγAlO γ Al2O3 Al O analyzed nano-γ-Al2O group H2 H (H CH CO 18824wt wt 18 824wt 18.824wt , (MgO) 4511wt 4 511wt 4.511wt (CuO) 928wt 9 28wt 9.28wt (NiO) 16164wt 16 164wt 16.164wt γAl2O3, γAl2O3 γAlO (γ-Al2O3) respectively nanometal metal Al2O3, γ-Al2O3 alcohols nanoγAl nanoγAl2O AlO Al2O 1 (MgO (CuO (NiO γAl γAl2O (γ-Al2O3 γ-Al2O (γ-Al2O