III International Conference

PP-III-87CONVERSION OF NATURAL GAS INTO LIQUID PRODUCTS OVERBIMETALLIC ZEOLITE CATALYSTSVosmerikov A.V., Echevsky G.V. 1 , Vosmerikova L.N., Kodenev E.G. 1Institute of Petroleum Chemistry SB RAS, Tomsk, Russia1 Boreskov Institute of Catalysis SB RAS, Novosibirsk, RussiaE-mail: pika@ipc.tsc.ruJoint promoting action of molybdenum and gallium on catalytic zeolite properties withSi/Al ratio of 40 in the process of natural gas conversion into liquid products is studied. It isshown that the introduction of gallium cations into a Mo-containing zeolite results inincreased catalyst activity in the process of natural gas conversion. It is established thatmaximal amount of aromatic compounds is formed over a bimetallic zeolite systemcontaining 4.0 % of Mo nanopowder and 1.0% of gallium oxide.The development of chemical processes of natural gas conversion belongs to the prioritytasks of fuel-energy complex. At the same time direct conversion of natural gas into higherhydrocarbons is limited due a high stability and low reactivity of methane fraction. It isimpossible to carry out chemical conversion of natural gas components into liquid organiccompounds without applying highly active polyfunctional catalysts. A zeolite of pentasilfamily containing a certain amount of promoters that posses, as a rule, an increaseddehydrating ability is the main component of such catalysts. That is why this work aims tostudy a joint promoting action of molybdenum and gallium on catalytic properties of a zeolitewith Si/Al ratio of 40 in the natural gas conversion.The zeolite was modified via dry mechanical mixing of a zeolite powder with a nanosizedMo powder (4.0 wt%) produced by wire electroexplosion in argon medium. Mixing wascarried out in the KM-1 vibration mill on air for 2 h. Then the mixture obtained wasimpregnated by aqueous solution of gallium nitrate (the weight fraction of gallium waschanged from 0.5 to 5.0%), dried at 100-110 o C and calcined on air at 550 o C for 5 h.Conversion of natural gas of the composition (wt%): methane 81.6, ethane 6.46, propane7.40, butanes 4.04, pentanes 0.47 was carried out in a flow type installation equipped with aquartz reactor under atmospheric pressure, at the reaction temperature of 500-750 o C and gashourly space velocity (GHSV) 1000 h -1 .Fig. 1 shows the effect of the process temperature on the composition of natural gasconversion products over a sample 4.0% Mo/ZSM-5 containing 1.0% Ga 2 О 3 at the gas hourlyspace velocity 1000 h -1 . The conversion degree of initial feedstock and yield of aromatic634