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The effect of ammonia on the catalytic performance for 1-methylnaphthalene(1-MN) selective hydrogenation saturation was studied with Co-Mo/γ-Al2O3, Ni-W/γ-Al2O3, Ni-Mo/γ-Al2O3, and Ni-Mo-W/γ-Al2O3 catalysts. The results indicated that Ni-Mo-W/γ-Al2O3 cata