The invention relates to a device for diffusing substance by catalytic combustionallowing the emission of volatile matter comprising: a container (4) containingthe liquid to be vaporized, said container (4) having a wick (6) comprising a firstend which is dipped in said liquid to be vaporized and a second end which is outsideof said container (4) and a diffusion head (2) comprising a catalytic combustionarea and a vaporization area characterized in that said diffusion head (2) isconnected detachably to said second end of said wick (6).
