EFFECT OF TREATMENT WITH CARBON DIOXIDE OF THE Zn FORM OF THE TsVK ZEOLITE ON ITS ACID AND CATALYTIC PROPERTIES IN THE CONVERSION OF METHANOL TO HYDROCARBONS
It is shown that it is possible to increase the yield of liquid hydrocarbons of the benzene fraction in the Mobil process by use of a catalyst modified by treatment with CO2 of the Zn form of the TsVK zeolite. It is established that on treatment with CO2 of the Zn-TzVK zeolite the concentration of strongly acidic α-centers is increased. As a result of alkylation of C2-C4 olefins by methanol at these sites more of the high molecular C5-C8 aliphatic hydrocarbons are formed. Selectivity of conversion of methanol to liquid C5-C10 hydrocarbons of the benzene fraction is increased, but selectivity with respect to the light C2-C4 fractions is decreased.