Nano-WO3-supported sulfonic acid: New, efficient and high reusable heterogeneous nano catalyst

•Nano-WO3-supported sulfonic acid has been reported.•The n-WSA works very well for different organic reactions with excellent yields.•The advantages of n-WSA are high efficiently, reusability and operational simplicity.•The n-WSA was easily separated and reused for several runs without loss activity.

Nano-WO3-supported sulfonic acid [n-WO3-SO3H (n-WSA)] is easily prepared from the reaction of nano WO3 with chlorosulfonic acid as sulfonating agent. This new catalyst is characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), FT-IR spectroscopy, thermal gravimetric analysis (TGA), pH analysis and Hammett acidity function. Nano-WO3-supported sulfonic acid is used as an efficient and recyclable catalyst for some organic reactions such as synthesis of 1,8-dioxo-octahydroxanthene, tetrahydrobenzoxanthene and benzimidazolo quinazolinone derivatives. All of the reactions are very fast and the yields are excellent. The used catalyst was easily separated and reused for 10 runs without appreciable loss of its catalytic activity.

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