Nanoscale composite catalyst to reduce carbon monoxide in the mainstream smoke of a cigarette
AssigneePhilip Morris USA Inc.
InventorsSarojini Deevi, Kent B. Koller
Life of this patent
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Abstract
Cut filler compositions, cigarette paper, cigarette filters, cigarettes, methods for making cigarettes and methods for smoking cigarettes are provided, which involve the use of nanoscale particle composite catalysts capable of acting as a catalyst for the conversion of carbon monoxide to carbon dioxide. The nanoscale composite catalyst comprises metal and/or metal oxide particles supported on nanoscale support particles. The nanoscale composite catalyst can be prepared by forming a mixture by combining nanoscale particles with a colloidal solution, a metal precursor solution with nanoscale particles, or a metal precursor solution with a colloidal solution, and then heat-treating the mixture.
Claims57
A cut filler composition comprising tobacco and a nanoscale composite catalyst for the conversion of carbon monoxide to carbon dioxide, wherein the nanoscale composite catalyst comprises nanoscale metal particles and/or nanoscale metal oxide particles supported on nanoscale support particles, wherein the nanoscale metal particles and/or nanoscale metal oxide particles have an average particle size from about 3 nm to less than about 100 nm and comprise an element selected from the group consisting of B, Mg, Al, Si, Ti, Fe, Co, Ni, Zn, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Sn, Hf, Ta, W, Re, Os, Ir, Pt, Au and mixtures thereof.
A cigarette comprising cut tobacco filler, cigarette paper and cigarette filter, wherein the cut filler, cigarette paper and/or cigarette filter comprise a catalyst capable of converting carbon monoxide to carbon dioxide, wherein the catalyst is in the form of a nanoscale composite catalyst comprising nanoscale metal particles and/or nanoscale metal oxide particles supported on nanoscale support particles, wherein the nanoscale metal particles and/or nanoscale metal oxide particles have an average particle size from about 3 nm to less than about 100 nm and comprise an element selected from the group consisting of B, Mg, Al, Si, Ti, Fe, Co, Ni, Zn, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Sn, Hf, Ta, W, Re, Os, Ir, Pt, Au and mixtures thereof.
A method of making a cigarette, comprising:
- (i) incorporating a nanoscale composite catalyst in tobacco cut filler, cigarette paper and/or cigarette filter;
- (ii) providing the cut filler to a cigarette making machine to form a tobacco column;
- (iii) placing a paper wrapper around the tobacco column to form a tobacco rod;
- and
- (iv) attaching the cigarette filter to the tobacco rod to form the cigarette, wherein the nanoscale composite catalyst comprises nanoscale support particles and nanoscale metal particles and/or nanoscale metal oxide particles on at least one of the nanoscale support particles, wherein the nanoscale metal particles and/or nanoscale metal oxide particles comprise an element selected from the group consisting of B, Mg, Al, Si, Ti, Fe, Go, Ni, Zn, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Sn, Hf, Ta, W, Re, Os, Ir, Pt, Au and mixtures thereof.
A method of making a cigarette, comprising:
- (i) incorporating a nanoscale composite catalyst in tobacco cut filler, cigarette paper and/or cigarette filter;
- (ii) providing the cut filler to a cigarette making machine to form a tobacco column;
- (iii) placing a paper wrapper around the tobacco column to form a tobacco rod;
- and
- (iv) attaching the cigarette filter to the tobacco rod to form the cigarette, wherein the nanoscale composite catalyst comprises nanoscale support particles and nanoscale metal particles and/or nanoscale metal oxide particles, wherein the nanoscale metal particles and/or nanoscale metal oxide particles comprise an element selected from the group consisting of B, Mg, Al, Si, Ti, Fe, Go, Ni, Zn, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Sn, Hf, Ta, W, Re, Os, Ir, Pt, Au and mixtures thereof, further comprising forming the nanoscale composite catalyst by:
- combining nanoscale metal and/or metal oxide particles with a colloidal solution,
- increasing the viscosity of the colloidal solution to form an intimate mixture of the metal and/or metal oxide nanoscale particles and the colloidal solution, and
- drying the mixture to form the nanoscale composite catalyst.
A method of making a cigarette, comprising:
- (i) incorporating a nanoscale composite catalyst in tobacco cut filler, cigarette paper and/or cigarette filter;
- (ii) providing the cut filler to a cigarette making machine to form a tobacco column;
- (iii) placing a paper wrapper around the tobacco column to form a tobacco rod;
- (iv) attaching the cigarette filter to the tobacco rod to form the cigarette, wherein the nanoscale composite catalyst comprises nanoscale support particles and nanoscale metal particles and/or nanoscale metal oxide particles, wherein the nanoscale metal particles and/or nanoscale metal oxide particles comprise an element selected from the group consisting of B, Mg, Al, Si, Ti, Fe, Co, Ni, Zn, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Sn, Hf, Ta, W, Re, Os, Ir, Pt, Au and mixtures thereof, and
- (v) combining nanoscale metal and/or metal oxide particles and nanoscale support particles comprising an oxide selected from the group consisting of aluminum oxide, silicon oxide, titanium oxide, iron oxide, cobalt oxide, copper oxide, zirconium oxide, cerium oxide, yttrium oxide optionally doped with zirconium, manganese oxide optionally doped with palladium, and mixtures thereof to form the nanoscale composite catalyst, further comprising forming the nanoscale composite catalyst by:
- combining a metal precursor and a solvent to form a metal precursor solution,
- combining the metal precursor solution with nanoscale support particles to form a mixture,
- heating the mixture to a temperature effective to thermally decompose the metal precursor into nanoscale particles, and
- drying the mixture.
Dependencies are inferred from the claim text.