Patent ID: 7141529

Claim:
A method of preparing a dewaxing catalyst suitable for use in a process for dewaxing a hydrocarbon feed to produce an isomerized product, the feed including straight chain and slightly branched chain paraffins having 10 or more carbon atoms, the method of preparation comprising the following steps: (a) synthesizing a one-dimensional 10 ring molecular sieve having one-dimensional pores, said pores having a minor axis between about 4.2 A and about 4.8 A and a major axis between about 5.0 A and about 7.0 A, wherein the molecular sieve is subsequently converted to acidic form, the molecular sieve being selected from the group consisting of SAPO-11, SAPO-31, SAPO-41, SM-3, SM-6, SSZ-32, ZSM-23, EU-13, ISI-4, KZ-1, Theta-1, ISI-1, KZ-2, NU-10 and ZSM-22, (b) mixing said molecular sieve with a refractory inorganic oxide carrier precursor and an aqueous solution to form a mixture, the mixture having a molecular sieve content from about 5 to about 60 wt %; (c) extruding or forming the mixture from step (b) to form an extrudate or formed particle; (d) drying the extrudate or formed particle of step (c); (e) calcining the dried extrudate or formed particle of step (d); (f) modifying the calcined extrudate or formed particle of step (e) with at least one metal selected from the group consisting of Ca,Cr,Mg,La,Ba,Na,Pr,Sr,K, and Nd to prepare a metal modified extrudate or formed particle wherein the metals modification enhances the n- paraffin isomerization selectivity of the catalyst; (g) drying of the metal loaded extrudate or formed particle of step (f), (h) loading of the metal modified extrudate or formed particle of step(g) with a Group VIII metal to prepare a catalyst precursor; (i) drying the catalyst precursor of step (h); (j) calcining the dried catalyst precursor of step (i) to form a finished bound dewaxing catalyst.