Hybrid supported catalyst system and method of preparing polyolefin using the same

A hybrid supported catalyst system comprising;

• one or more organic chromium compounds and one or more metallocene compounds supported on a support,
• wherein the organic chromium compound includes two or more of a group represented by the following Chemical Formula 1 in a molecule, phosphorous atoms (P) in one or more of the group represented by Chemical Formula 1 form a coordinate bond with chromium (Cr), and a linkage group (L) linking the two or more groups represented by the following Chemical Formula 1 via 4 to 8 carbon atoms is an aliphatic group having 2 to 20 carbon atoms, a heteroaliphatic group having 2 to 20 carbon atoms, an alicyclic group having 2 to 20 carbon atoms, a heteroalicyclic group having 2 to 20 carbon atoms, or a group prepared by linking two or more of the aliphatic group, the heteroaliphatic group, the alicyclic group, and the heteroalicyclic group:
• wherein * is a part which binds to the linkage group (L) linking the two or more groups, and
• R1 to R4 are each independently an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, or an alkoxyaryl group having 7 to 20 carbon atoms.