Methods for producing metal carbide and hydrocarbon, and carboncontaining member

Abstract

A method for producing a metal carbide, including electrode preparation that includes preparing a first molten salt containing at least one first metal ion selected from alkali metal ions or alkali earth metal ions, and a carbonate ion, and applying a voltage to the first molten salt to precipitate a precipitate containing carbon on a first electrode, thereby obtaining a second electrode; and electrolysis that includes applying a voltage to a second molten salt containing at least one second metal ion selected from alkali metal ions or alkali earth metal ions using the second electrode to obtain a carbide composition containing a carbide of the second metal.

1 . A method for producing a metal carbide, comprising:
 electrode preparation comprising:   preparing a first molten salt containing at least one first metal ion selected from the group consisting of alkali metal ions and alkali earth metal ions, and a carbonate ion, and   applying a voltage to the first molten salt to precipitate a precipitate containing carbon on a first electrode, thereby obtaining a second electrode; and   electrolysis comprising applying a voltage to a second molten salt containing at least one second metal ion selected from the group consisting of alkali metal ions and alkali earth metal ions using the second electrode to obtain a carbide composition containing a carbide of the second metal.   
     
     
         2 . The method for producing a metal carbide according to  claim 1 , wherein the first electrode contains at least one selected from the group consisting of a transition metal and an alloy containing a transition metal. 
     
     
         3 . The method for producing a metal carbide according to  claim 1 , wherein the first electrode contains an alloy containing iron. 
     
     
         4 . The method for producing a metal carbide according to  claim 1 , wherein the first electrode contains SUS304. 
     
     
         5 . The method for producing a metal carbide according to  claim 1 , wherein the second molten salt is substantially free from carbonate ions. 
     
     
         6 . The method for producing a metal carbide according to  claim 1 , wherein, in the electrolysis, the first molten salt used in the electrode preparation is used as it is as the second molten salt. 
     
     
         7 . The method for producing a metal carbide according to  claim 1 , wherein the second molten salt contains at least one selected from the group consisting of a halide ion and an oxide ion as an anion. 
     
     
         8 . The method for producing a metal carbide according to  claim 1 , wherein the first metal ion and the second metal ion are the same. 
     
     
         9 . The method for producing a metal carbide according to  claim 1 , wherein the carbide composition further contains at least one selected from the group consisting of carbon, a simple substance, a halide, a carbonate, an oxide, a hydride, and a peroxide of the second metal, and a simple substance, a halide, a carbonate, an oxide, and a carbide of the first metal. 
     
     
         10 . The method for producing a metal carbide according to  claim 1 , wherein the second molten salt contains at least one selected from the group consisting of a sodium ion, a lithium ion, and a potassium ion, and a calcium ion, as the second metal ion. 
     
     
         11 . A method for producing a hydrocarbon, comprising:
 electrode preparation comprising:
 preparing a first molten salt containing at least one first metal ion selected from the group consisting of alkali metal ions and alkali earth metal ions, and a carbonate ion derived from carbon dioxide, and 
 applying a voltage to the first molten salt to precipitate a precipitate containing carbon on a first electrode, thereby obtaining a second electrode; 
   electrolysis comprising applying a voltage to a second molten salt containing at least one second metal ion selected from the group consisting of alkali metal ions and alkali earth metal ions using the second electrode to obtain a carbide composition containing a carbide of the second metal; and   gas generation comprising hydrolyzing the carbide of the second metal to obtain gas containing a hydrocarbon.   
     
     
         12 . The method for producing a hydrocarbon according to  claim 11 , wherein the hydrocarbon is acetylene. 
     
     
         13 . The method for producing a hydrocarbon according to  claim 11 , wherein the gas comprises acetylene as the hydrocarbon, and further comprises at least one selected from the group consisting of ethylene, ethane, methane, methylacetylene, propylene, butene, and hydrogen. 
     
     
         14 . A carbon-containing member comprising:
 a base;   a metal carbide layer covering at least a part of the base and containing a carbide of at least one second metal selected from the group consisting of alkali metals and alkali earth metals; and   a carbon layer covering at least a part of the metal carbide layer, containing carbon, and being substantially free from the second metal carbide.