Some embodiments are directed to a device for catalytically diffusing a fragrance or active substances, wherein the device includes a bottle with a base, and containing a liquid including a fragrance； a catalytic combustion burner mounted on the base； a capillary wick attached to the burner and partially submerged in the liquid； and a closing cap removably mounted on the base and covering the burner. The cap includes a sealing means bearing against a periphery of a top of the base.
