In this research, a magnetically-recoverable catalyst (NiFe 2 O 4 @SiO 2 -H 3 PMo 12 O 40 ) was prepared by supporting phosphomolybdic acid (H 3 PMo 12 O 40 ) onto silica-coated NiFe 2 O 4 nanoparticles. The prepared sample was characterized by FT-IR, TEM, SEM and VSM techniques and then the catalytic activity of this catalyst was investigated in the synthesis of tri-and tetra-substituted imidazole derivatives. More importantly, the catalyst was easily isolated from the reaction mixture by a magnetic bar and reused at least ten times without significant degradation in its activity.

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