Patent ID: 8481451

Claim:
A composite catalyst for hydrocarbon steam cracking comprising: 0.5 to 50% by weight of an oxide catalyst represented by CrZr j A k O x , wherein 0.5≦j≦120, 1≦k≦50, A is a transition metal, and x is a number corresponding to the atomic values of Cr, Zr, and A and values of j and k, and 50 to 99.5% by weight of a carrier, wherein the composite catalyst has an outer radius r 2 of 0.5R to 0.96R (where R is a radius of a cracking reaction tube), a thickness (t; outer radius r 2 −inner radius r 1 ) of 2 to 6 mm, and a length (h) of 0.5r 2 to 10r 2 .