Catalytic combustion burner made from a porous material and flask equipped with such a burner

Catalytic combustion burner made from a porous material designed to cooperate with a wick that will carry a combustible composition to the burner that penetrates into the pores of the porous material, said burner comprising a peripheral zone that supports a catalyst and that surrounds a central zone without a catalyst forming a vaporization zone, the peripheral zone and the central zone being located in an upper part of the burner, said burner having a peripheral surface in contact with ambient air, said peripheral surface being provided with at least one first shoulder approximately around the periphery and facing inwards and downwards to increase a diameter between a lower part and the upper part of the burner, wherein said peripheral surface is tapered and has a truncated cone form flaring upwards, said peripheral surface allowing hot air circulating vertically close to the burner to make stronger contact with said burner and thus facilitating heat and chemical exchanges between the burner and the ambient air, wherein said first shoulder separates the peripheral zone supporting the catalyst from the lower part of the burner without the catalyst, and wherein at least part of the catalyst is supported by the peripheral surface having a truncated cone form flaring upwards.