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17 fused silica to give a H2/CO gas mixture of 2:1 suitable for exclusive production of methanol according to Example 4. EXAMPLE 6 Producing dimethyl ether (DME) by the dehydration of methanol formed according to example 5 using a solid acid catalyst such as Na?on H. EXAMPLE 7 Producing dimethyl ether (DME) according to Example 6 by recycling Water formed into the reaction mixture as in example5alloWingDME tobeformedbyjustutiliZingCH4 andCO2 ina3:1overallmolarratio. What isclaimedis: 1.A processofmakingexclusivelydimethyletherfrom carbon dioxide and a methane source Which comprises: preparing methanol from carbon dioxide and a methane sourceby: combining Wet reforming and dry reforming of su?i cient amounts of methane, carbon dioxide and Water under reaction conditions su?icient to produce an essentially2:1molarmixtureofhydrogenandcarbon monoxide; and converting the essentially 2:1 hydrogen and carbon monoxidemixtureunderconditionssu?icienttoform 18 ing step are present in a mole ratio of about 3: 1:2 to provide a mixture of hydrogen and carbon monoxide in a mole ratio of about 1:2. 4. The method of claim 1, Wherein substantially all of the carbon monoxide and hydrogen are converted to methanol. 5.Themethodofclaim1,Whereinthecombinedbi-reform ingisconductedatatemperaturerangeofabout800to11000 C. 6. The method of claim 1, Wherein the bi-reforming is conducted in the presence of a combination of a metal and a metaloxidecatalysts. 7.Themethodofclaim6,Whereinthecatalystcombination isNi andV205; Ni2O3 andV205; orNi2V2O7 and Ni3V2O8. 8.Themethodofclaim7,Whereinthecatalystcombination is supported on a high surface or nanostructured support. 9. The method of claim 8, Wherein the support comprises silica, alumina, a metal oxide or a metal. 10. The method of claim 1, Wherein the combined Wet and dryreformingisconductedinthepresenceofacombination 20 ofmetaloxidecatalysts. US 7,906,559B2 methanol; dehydratingthemethanolthusproduced;and recyclinganyWaterthatispresentunderconditionssu?i 30 Mg,Cu,Mo,Bi,Fe,Mn,Co,Nb,Zr,LaorSn. 25 11. The method of claim 10, Wherein the catalyst combi nation is supported on a high surface or nanostructured sup port. 12.Themethodofclaim11,Whereinthesupportcomprises silica, alumina, a metal oxide or a metal. 13. The method of claim 1, Wherein the combined Wet and dry reforming is conducted in the presence of an added cata lystthatincludessingleormixedcatalystsbasedonV,Ti,Ga, 14. The method of claim 13, Wherein the catalyst combi nation is supported on a high surface or nanostructured sup port. 15.Themethodofclaim14,Whereinthesupportcomprises anddryreformingisconductedeitherinseparatetWostepsor35 silica,alumina,ametaloxideorametal. cient to utiliZe only carbon dioxide and methane from the methane source to produce exclusively dimethyl ether. 2.Themethodofclaim1,WhereinthecombiningoftheWet combined in a single step With the methane, carbon dioxide and Water present in su?icient stoichiometric amounts to providethehydrogenandcarbonmonoxideforproductionof methanol. 3. The method of claim 2 Wherein the methane, carbon dioxideandWaterpresentinthesinglecombinedbi-reform 16. The method of claim 1, Wherein the methane source is natural gas, coal bed methane, methane hydrates, or alumi num carbidebasedmethane.PDF Image | CONVERSION OF CARBON DIOXIDE TO METHANOL
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