US2005133053A1PendingUtilityA1

Smoking articles comprising copper-exchanged molecular sieves

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Assignee: PHILIP MORRIS USA INCPriority: Dec 22, 2003Filed: Dec 22, 2003Published: Jun 23, 2005
Est. expiryDec 22, 2023(expired)· nominal 20-yr term from priority
Inventors:Jay A FournierZhaohua Luan
A24D 3/12A24D 1/002A24D 3/166
51
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Claims

Abstract

Smoking articles which involve the use of a copper-exchanged molecular sieve catalyst that is capable of removing NO and/or NO 2 from mainstream smoke are provided. The copper-exchanged molecular sieve catalyst comprises a microporous molecular sieve substrate having pores with an average diameter of from about 3 Å to about 15 Å, where at least some of the pores of the microporous molecular sieve substrate contain Cu +2 ions. Methods for making cigarette filters and smoking articles using the copper-exchanged molecular sieve catalyst, as well as methods for smoking a cigarette comprising the copper-exchanged molecular sieve catalyst, are also provided.

Claims

exact text as granted — not AI-modified
1 . A smoking article comprising a copper-exchanged molecular sieve catalyst, wherein the copper-exchanged molecular sieve catalyst is capable of removing NO, NO 2 , or both from mainstream smoke during smoking; 
 wherein the copper-exchanged molecular sieve catalyst comprises a microporous molecular sieve substrate having pores with an average pore size of from about 3 Å to about 15 Å.    
   
   
       2 . The smoking article of  claim 1 , wherein the copper-exchanged molecular sieve catalyst comprises pores sufficiently small to substantially exclude constituents in mainstream smoke having more than 12 carbon atoms.  
   
   
       3 . The smoking article of  claim 1 , wherein the copper-exchanged molecular sieve catalyst is capable of selectively removing more benzene and 1,3-butadiene from mainstream smoke than molecules larger than benzene.  
   
   
       4 . The smoking article of  claim 1 , wherein the microporous molecular sieve substrate has an average pore size of about 8 Å or smaller.  
   
   
       5 . The smoking article of  claim 4 , wherein the microporous molecular sieve substrate has an average pore size of about 6 Å or smaller.  
   
   
       6 . The smoking article of  claim 1 , wherein the copper-exchanged molecular sieve catalyst is in particle form having an average mesh size from about 20 mesh to about 60 mesh.  
   
   
       7 . The smoking article of  claim 1 , wherein the microporous molecular sieve substrate is a zeolite selected from the group consisting of zeolite ZSM-5, zeolite A, zeolite X, zeolite Y, zeolite K-G, zeolite ZK-5, zeolite Beta, zeolite ZK-4, and mixtures thereof.  
   
   
       8 . The smoking article of  claim 1 , wherein the copper-exchanged molecular sieve catalyst is Cu(II)-ZSM-5.  
   
   
       9 . The smoking article of  claim 1 , further comprising a second molecular sieve material, wherein the second molecular sieve material is capable of selectively removing at least some of at least one constituent of mainstream smoke that is not substantially removed by the copper-exchanged molecular sieve catalyst.  
   
   
       10 . The smoking article of  claim 9 , wherein the second molecular sieve material comprises a catalytic metal other than copper(II).  
   
   
       11 . The smoking article of  claim 10 , wherein the catalytic metal is selected from the group consisting of iron, manganese, and mixtures thereof.  
   
   
       12 . The smoking article of  claim 1 , wherein the smoking article is selected from the group consisting of a cigarette, a pipe, a cigar and a non-traditional cigarette.  
   
   
       13 . The smoking article of  claim 12 , wherein the smoking article is a cigarette.  
   
   
       14 . The smoking article of  claim 1 , wherein the copper-exchanged molecular sieve catalyst is dispersed in the smoking mixture of the smoking article.  
   
   
       15 . The smoking article of  claim 1 , wherein the copper-exchanged molecular sieve catalyst is incorporated into a filter portion of the smoking article.  
   
   
       16 . The smoking article of  claim 1 , comprising from about 10 mg to about 300 mg of the copper-exchanged molecular sieve catalyst.  
   
   
       17 . The smoking article of  claim 16 , comprising from about 50 to about 150 mg of the copper-exchanged molecular sieve catalyst.  
   
   
       18 . A cigarette filter comprising a copper-exchanged molecular sieve catalyst, wherein the copper-exchanged molecular sieve catalyst is capable of removing NO, NO 2 , or both from mainstream smoke; 
 wherein the copper-exchanged molecular sieve catalyst comprises a microporous molecular sieve substrate having pores with an average pore size of from about 3 Å to about 15 Å;    and further wherein at least some of the pores of the microporous molecular sieve substrate contain Cu +2  ions.    
   
   
       19 . The cigarette filter of  claim 18 , wherein the microporous molecular sieve substrate comprises pores sufficiently small enough to substantially exclude constituents in mainstream smoke having more than 12 carbon atoms.  
   
   
       20 . The cigarette filter of  claim 18 , wherein the copper-exchanged molecular sieve catalyst is capable of selectively removing benzene and 1,3-butadiene from mainstream smoke, without removing molecules larger than benzene.  
   
   
       21 . The cigarette filter of  claim 18 , wherein the microporous molecular sieve substrate has an average pore size of about 8 Å or smaller.  
   
   
       22 . The cigarette filter of  claim 21 , wherein the microporous molecular sieve substrate has an average pore size of about 6 Å or smaller.  
   
   
       23 . The cigarette filter of  claim 18 , wherein the copper-exchanged molecular sieve catalyst is in particle form having an average mesh size from about 20 mesh to about 60 mesh.  
   
   
       24 . The cigarette filter of  claim 18 , wherein the microporous molecular sieve substrate is a zeolite selected from the group consisting of zeolite ZSM-5, zeolite A, zeolite X, zeolite K-G, zeolite ZK-5, zeolite Beta, zeolite ZK-4, and mixtures thereof.  
   
   
       25 . The cigarette filter of  claim 18 , wherein the copper-exchanged molecular sieve catalyst is Cu(II)-ZSM-5.  
   
   
       26 . The cigarette filter of  claim 18 , further comprising a second molecular sieve material, wherein the second molecular sieve material is capable of selectively removing at least some of at least one constituent of mainstream smoke that is not substantially removed by the copper-exchanged molecular sieve catalyst.  
   
   
       27 . The cigarette filter of  claim 26 , wherein the second molecular sieve material comprises a catalytic metal other than copper(II).  
   
   
       28 . The cigarette filter of  claim 27 , wherein the catalytic metal is selected from the group consisting of iron, manganese, and mixtures thereof.  
   
   
       29 . The cigarette filter of  claim 18 , comprising from about 10 mg to about 300 mg of the copper-exchanged molecular sieve catalyst.  
   
   
       30 . The cigarette filter of  claim 29 , comprising from about 50 mg to about 150 mg of the copper-exchanged molecular sieve catalyst.  
   
   
       31 . A method of making a cigarette filter, the method comprising incorporating a copper-exchanged molecular sieve catalyst into a cigarette filter, wherein the copper-exchanged molecular sieve catalyst is capable of removing NO, NO 2  or both from mainstream smoke; 
 wherein the copper-exchanged molecular sieve catalyst comprises a microporous molecular sieve substrate having pores with an average diameter of from about 3 Å to about 15 Å;    and further wherein at least some of the pores of the microporous molecular sieve substrate contain Cu +2  ions.    
   
   
       32 . A method of making a cigarette, the method comprising: 
 (i) providing a cut filler comprising a copper(II) exchanged molecular sieve catalyst interspersed in the cut filler to a cigarette making machine to form a tobacco column;    (ii) placing a paper wrapper around the tobacco column to form a tobacco rod; and    (iii) attaching a cigarette filter to the tobacco rod to form the cigarette.    
   
   
       33 . A method of smoking the cigarette of  claim 13 , comprising lighting or heating the cigarette to form smoke and drawing the smoke through the cigarette, wherein during the smoking of the cigarette, the copper-exchanged molecular sieve catalyst reduces the concentration of at least one of NO and NO 2  in the mainstream smoke.

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