Study on direct conversion of CH4-CO2 to oxygenated compounds by two-step reaction sequence

The feasibility of direct conversion of CH4 and CO2 to oxygenated compounds by means of a two-step reaction sequence at low temperature was suggested. The thermodynamics of isothermal and nonisothermal two-step reaction was a nalyzed. The reactivity of CH4 adsorbed and CO2 was investigated with tempe rature programming surface reaction (TPSR) from 323 to 873 K and with a con tinuous fixed-bed flow micro-reactor from 443 to 573 K at normal pressure. The product was analyzed by means of GC-MS and IC. The preliminary experime nt results showed that the interaction of CH4 adsorbed and CO2 over Cu-Co b ased catalysts can produce various kinds of compounds such as. alcohol, ald ehyde, ketone, carboxylic acid and cyclopentane derivatives I and II. The p roduct composition and distribution depend greatly on feeding methods, but the acetic acid and cyclopentane derivative I are always produced for the t hree kinds of feeding methods studied in this paper. The optimum temperatur e is 523 K and the Cu/Co molar ratio is 5 for acetic acid production. The F T-IR measurement results showed the formation of CHx and CHxO over the cata lyst samples.