MODIFIED ZEOLITE CATALYST AND METHODS FOR PRODUCING AND USING SAME

摘要

The invention pertains to a zeolite catalyst, methods of making same, and its use in the catalytic cracking of naphtha for the production of lower molecular weight olefins and alkanes, while minimizing production less desirable products. A zeolite is modified by base leaching and by the addition of a metal cation, thereby lowering the Si/Al2 ratio and improving the stability of the formed catalyst.

主权项

1. A method of modifying a zeolite catalyst comprising:
providing a zeolite catalyst; contacting the provided zeolite catalyst with a first composition comprising NaOH and Na2CO3, thereby producing a leached zeolite catalyst; contacting the leached zeolite catalyst with a second composition comprising a realuminating agent, thereby producing a realuminated zeolite catalyst; modifying the provided zeolite catalyst, the leached zeolite catalyst, or the realuminated zeolite with one or more metal atoms or ions comprising Mg, Ba, Sr, Cr, Fe, Co, Ni, Cu, Zn, Ga, Ce, Ag, Pd, Bi, Ti, V, Zr, Mo, W, Li, or La, or a mixture thereof; wherein the method produces a modified zeolite catalyst.