A micro-combustion device generating electrical power raises global performance of the system, is compact, and reduces losses by utilizing an induced helical path. The device includes: injection ducts inserting a combustion agent, a fuel and/or a mixture thereof wherein the injection of the combustion agent takes place tangentially to the internal cylindrical wall, inducing a helical combustion path, the internal cylindrical walls of the chamber having a deposition of catalytic material to accelerate the combustion reaction; a turbo compressor group, including a compressor, feeding under pressure the combustion chamber through the injection ducts, and a turbine, receiving the flue gases from the discharge duct, compressor and turbine being keyed on the same axis, whereon a generator of electrical power, in turn, is keyed; and a fuel cell, fed by the flue gases through the turbine and by an oxidizing agent, implementing an electrochemical process generating additional electrical power.

The invention provides highly reactive nano-sized alumina particle compositions, including alumina compositions with a BET surface areas on the order of 2000 m.sup.2/g. Also disclosed are impregnated alumina supports comprising materials that are metal oxides or carbonates. Methods for the synthesis and fabrication of these compositions are provided, along methods for the use of these compositions as sorbents.

The invention provides highly reactive nano-sized alumina particle compositions, including alumina compositions with a BET surface areas on the order of 2000 m.sup.2/g. Also disclosed are impregnated alumina supports comprising materials that are metal oxides or carbonates. Methods for the synthesis and fabrication of these compositions are provided, along methods for the use of these compositions as sorbents.

A two-stage combustor having as constituent parts: a partial oxidation reactor, which catalytically converts a hydrocarbon fuel and a first supply of oxidant into a gaseous partial oxidation product; and a deep oxidation reactor having a premixer plenum fluidly connected to a porous heat spreader, which converts the gaseous partial oxidation product to deep oxidation products. In one embodiment, the premixer plenum provides an empty space wherein combustion occurs in flame mode. In a second embodiment, the premixer plenum contains a high pore density foam matrix, absent catalyst, which facilitates holding a flameless combustion downstream within the porous heat spreader. In both embodiments heat produced during combustion is transmitted from the heat spreader to an associated heat acceptor, such as a heater head of a Stirling engine.

A two-stage combustor having as constituent parts: a partial oxidation reactor, which catalytically converts a hydrocarbon fuel and a first supply of oxidant into a gaseous partial oxidation product; and a deep oxidation reactor having a premixer plenum fluidly connected to a porous heat spreader, which converts the gaseous partial oxidation product to deep oxidation products. In one embodiment, the premixer plenum provides an empty space wherein combustion occurs in flame mode. In a second embodiment, the premixer plenum contains a high pore density foam matrix, absent catalyst, which facilitates holding a flameless combustion downstream within the porous heat spreader. In both embodiments heat produced during combustion is transmitted from the heat spreader to an associated heat acceptor, such as a heater head of a Stirling engine.

Embodiments herein provide a combustion system comprising a combustion chamber having a catalyst bed, and a vessel for storing a propellant at a predefined pressure. The vessel comprising a first valve for controlling a flow of the propellant over the catalyst bed inside the combustion chamber and an input provided at the first valve, for injecting the propellant inside the combustion chamber at a predefined duration of injection for each cycle of injection. A predefined quantity of the propellant is injected in each cycle of the injection. The combustion system further comprises one or more glow plugs for maintaining a predefined temperature within the catalyst bed and an ignition glow plug for providing a source of ignition for combustion of the propellant inside the combustion chamber.

Embodiments herein provide a combustion system comprising a combustion chamber having a catalyst bed, and a vessel for storing a propellant at a predefined pressure. The vessel comprising a first valve for controlling a flow of the propellant over the catalyst bed inside the combustion chamber and an input provided at the first valve, for injecting the propellant inside the combustion chamber at a predefined duration of injection for each cycle of injection. A predefined quantity of the propellant is injected in each cycle of the injection. The combustion system further comprises one or more glow plugs for maintaining a predefined temperature within the catalyst bed and an ignition glow plug for providing a source of ignition for combustion of the propellant inside the combustion chamber.

The invention relates to an oxygen carrier solid, its preparation and its use in a method of combustion of a hydrocarbon feedstock by active mass chemical-looping oxidation-reduction, i.e. chemical-looping combustion (CLC). The solid, which is in the form of particles, comprises an oxidation-reduction active mass composed of metal oxide(s) dispersed in a ceramic matrix comprising at least at least one feldspar or feldspathoid with a melting point higher than 1500° C., such as celsian, and has, initially, a specific macroporous texture. The oxygen carrier solid is prepared from a precursor of the ceramic matrix, obtained from a macroporous zeolitic material with zeolite crystals of a specific size, and a precursor of the oxidation-reduction active mass.

The invention relates to an oxygen carrier solid, its preparation and its use in a method of combustion of a hydrocarbon feedstock by active mass chemical-looping oxidation-reduction, i.e. chemical-looping combustion (CLC). The solid, which is in the form of particles, comprises an oxidation-reduction active mass composed of metal oxide(s) dispersed in a ceramic matrix comprising at least at least one feldspar or feldspathoid with a melting point higher than 1500° C., such as celsian, and has, initially, a specific macroporous texture. The oxygen carrier solid is prepared from a precursor of the ceramic matrix, obtained from a macroporous zeolitic material with zeolite crystals of a specific size, and a precursor of the oxidation-reduction active mass.

A burner using a high-temperature combustion catalyst is disclosed. The disclosed burner using a high-temperature combustion catalyst comprises: a mixing and dispensing unit for mixing and dispensing fuel gas and air, which are to be supplied; a combustion catalyst unit for generating heat by catalytically combusting with the fuel gas to be supplied from the mixing and dispensing unit; and a premixing chamber for preliminarily mixing a combustion gas which is to enter the combustion catalyst unit while connecting the mixing and dispensing unit and the combustion catalyst unit, wherein the combustion catalyst unit comprises: a front/rear-open housing having a chamber therein; perforated plates provided on the front and rear surfaces of the housing so as to allow the fuel gas to pass through from the rear of the housing to the front thereof; a pellet-type combustion catalyst filled inside of the chamber of the housing; and a heat source means for generating a heat source for the catalytic combustion of the combustion catalyst. The high-temperature combustion catalyst further comprises preparation by the steps of: preparing a metal precursor solution containing a transition metal nitrate, an alkaline earth metal nitrate, and aluminum nitrate; preparing a precipitation solution; preparing a mixture solution by mixing the metal precursor solution and the precipitation solution; increasing the temperature of the mixture solution to 90˜100° C. and maintaining the same for 10˜48 hours so as to cause precipitation; separating a precipitate slurry, which is formed by precipitation, from the mixture solution by filtering the same; washing the precipitate slurry; performing drying in order to remove water contained in the washed precipitate slurry; and performing firing at 1,000˜1,500° C. in order to remove water remaining in the dried precipitate slurry.