Acidic and Catalytic Properties of Mo-Containing Zeolite Catalysts for Non-Oxidative Methane Conversion

A.V. Vosmerikov1, G.V. Echevsky2, L.L. Korobitsyna1, N.V. Arbuzova1, L.M. Velichkina1, S.P. Zhuravkov3, Ya.Ye. Barbashin1 and Ye.G. Kodenev2

1Institute of Petroleum Chemistry, Akademichesky Ave. 3, Tomsk 634021, Russia

2Boreskov Institute of Catalysis, Ak. Lavrentieva Ave. 5, Novosibirsk 630090, Russia

3Institute of Strength Physics and Material Science, Akademichesky Ave. 2/1, Tomsk 634021, Russia

Abstract

The conversion of methane into benzene, toluene and naphthalene at the reaction temperature of 750C and gas hourly space velocity (GHSV) of 500-1500 h-1 over zeolites modified via impregnation with ammonium heptamolybdate and mechanical mixing with Mo oxide and nanopowder is studied under non-oxidative conditions. It has been established that the highest methane conversion per one run and maximal yield of aromatic hydrocarbons are reached for the sample containing 4.0 mass.% of Mo nanopowder. The stability of Mo-containing zeolite catalysts in the process of methane dehydroaromatization at different GHSV has been studied and a characteristic presence of the induction period caused by the formation of active Mo forms both on the external surface and into the zeolite channels has been established. Both the duration of induction period and stable catalyst operation are decreasing with increasing of GHSV. It was demonstrated that acidic properties of a Mo-containing zeolite catalyst depend on Mo concentration and method of its introduction.