According to an aspect of the present invention, provided is a zeolite catalyst having an MRE structure for hydro-isomerization. The zeolite catalyst has an adsorption volume ratio of lutidine to collidine measured by Fourier-transform infrared spectroscopy (FTIR) using lutidine and collidine as adsorbents of greater than 3 and less than or equal to 10. According to an aspect of the present invention, provided is a method of hydro-isomerization for a hydrocarbon feedstock, including subjecting the hydrocarbon feedstock to a hydro-isomerization reaction under conditions of a temperature of 200 C. to 500 C., a hydrogen pressure of 1 to 200 atmospheres, a liquid space velocity (LHSV) of 1.0 to 10.0 hr.sup.1, and the hydrogen/feedstock ratio of 45 to 1780 Nm.sup.3/m.sup.3 in the presence of the zeolite catalyst.

An improved hydroisomerization catalyst and process for making a base oil product using a catalyst comprising SSZ-91 molecular sieve and ZSM-12 molecular sieve. The catalyst and process generally involves the use of a catalyst comprising an SSZ-91 molecular sieve combined with a ZSM-12 molecular sieve to produce dewaxed base oil products by contacting the catalyst with a hydrocarbon feedstock. The catalyst and process provide improved base oil cold properties, such as pour point and cloud point, along with other beneficial base oil properties.

Disclosed are crystalline mesoporous molecular sieves based on molecular sieve SSZ-91, methods for making mesoporous SSZ-91, and use of mesoporous SSZ-91 in hydroconversion applications. Mesoporous molecular sieve SSZ-91 is characterized as: having a low degree of faulting, having a low aspect ratio that inhibits hydrocracking as compared to conventional ZSM-48 materials having an aspect ratio of greater than 8, being substantially phase pure, and having a total pore volume (measured at P/P.sub.0 of 0.95) in the mesopore diameter range is at least about 0.2 cc/g and wherein the micropore volume is at least 0.05 cc/g.

Described are processes to produce base oils with one more improved properties, e.g., lower aromatics, economically and/or efficiently. In some embodiments the processes comprise a step that reduces the amount of residual refractory sulfur compounds prior to or simultaneous with a hydrofinishing step which advantageously provides base oils with lower aromatics than comparable processes.

Described are processes to produce base oils with one more improved properties, e.g., lower aromatics, economically and/or efficiently. In some embodiments, the processes relate to two stage (or more) hydrofinishing which advantageously provides base oils with lower aromatics than comparable one stage processes.

Provided herein are catalysts for dewaxing of a feedstock, the catalyst comprising between about 40 wt. % and about 99.9 wt. % zeolite, between about 0 wt. % and about 40 wt. % binder and at least about 0.1 wt. % noble metal, as well as catalyst systems, methods and products produced using the catalysts. The zeolite having a crystal comprising a largest included sphere less than or equal to about 7.5 angstroms, a largest diffusing sphere greater than or equal to about 5.0 angstroms, and a silica to alumina ratio greater than or equal to about 100:1. The catalyst having a temperature-programmed ammonia desorption (TPAD) of less than about 0.25 mmol/g.