Abstract: Catalysts for preparing ethylene by conversion of methane or purified natural gas and preparation thereof, and process for preparation of ethylene by direct conversion of methane or purified natural gas using said catalysts. The catalysts have the formula I as follows:Ma,Pc/S (I)wherein, M is a compound selected from the group consisting of RuCl.sub.2 (PPh.sub.3).sub.3, RuCl.sub.2 (CO).sub.2 (PPh.sub.3).sub.2, Ru.sub.3 (CO).sub.12, RhCl(CO)(PPh.sub.3).sub.2, IrCl(CO)PPh.sub.3).sub.3, Pd(PPh.sub.3).sub.4, Pt(PPh.sub.3).sub.4 and RuCl.sub.3.xH.sub.2 O, S is an inorganic carrier selected from the group consisting of .alpha.-Al.sub.2 O.sub.3, .gamma.-Al.sub.2 O.sub.3, SiO.sub.2, SiO.sub.2 -Al.sub.2 O.sub.3,Y-zeolite, MgO and TiO.sub.2, and P is a phosphorus compound promoter selected from the group consisting of PPh.sub.3, P(OCH.sub.3).sub.3, P(OC.sub.2 H.sub.5).sub.3, and P(O)(OC.sub.2 H.sub.5).sub.3 ; wherein a is the amount of metal in the catalyst, ranging from 0.

Abstract: Supported catalysts of the following formula (I) for preparing ethylene by conversion of methane or purified natural gas and preparation thereof, and process for preparation of ethylene by direct conversion of methane or purified natural gas using said catalysts:Ma'/S formula (I)(wherein, M is a compound selected from the group of RuCl.sub.2 (PPh.sub.3).sub.3, RuCl.sub.2 (CO).sub.2 (PPh.sub.3).sub.2, Ru.sub.3 (CO).sub.12, RhCl(CO)(PPh.sub.3).sub.2, IrCl(CO)(PPh.sub.3).sub.2, Pd(PPh.sub.3).sub.4, Pt(PPh.sub.3).sub.4, RuCl.sub.3 .multidot.xH.sub.2 O, RhCl.sub.3 .multidot.xH.sub.2 O, IrCl.sub.3 .multidot.xH.sub.2 O, PdCl.sub.2 .multidot.xH.sub.2 O, H.sub.2 PtCl.sub.6 .multidot.xH.sub.2 O, S is an inorganic carrier selected from .alpha.-Al.sub.2 O.sub.3, .gamma.-Al.sub.2 O.sub.3, SiO.sub.2, SiO.sub.2 --Al.sub.2 O.sub.3, Y-zeolite, MgO and TiO.sub.2, a' is weight percentage of metal in catalyst, ranging from 0.25 to 5 wt %.