CH3OH+CH4\mathrm{CH}_{3} \mathrm{OH}+\mathrm{CH}_{4}CH3OH+CH4
CH4\mathrm{CH}_{4}CH4
CH3OH+HCOOH\mathrm{CH}_{3} \mathrm{OH}+\mathrm{HCOOH}CH3OH+HCOOH
HCOOH\mathrm{HCOOH}HCOOH