Disclosed herein is a method of making activated EU-2 zeolite, including: pores having a diameter of 30 to 40 while maintaining the crystal structure of the EU-2 zeolite; and pores having a diameter of 40 to 200 , wherein the volume of the pores having a diameter of 30 to 40 is 0.01 to 0.06 cc/g, and the volume of the pores having a diameter of 40 to 200 is 0.07 to 0.4 cc/g.

Disclosed herein is a method of making activated EU-2 zeolite, including: pores having a diameter of 30 to 40 while maintaining the crystal structure of the EU-2 zeolite; and pores having a diameter of 40 to 200 , wherein the volume of the pores having a diameter of 30 to 40 is 0.01 to 0.06 cc/g, and the volume of the pores having a diameter of 40 to 200 is 0.07 to 0.4 cc/g.

A method for producing a hydroisomerization catalyst according to the present invention includes: a first step of preparing a catalyst to be treated, which contains a support having a one-dimensional porous structure including a 10-membered ring and at least one metal selected from the group consisting of: group 8 to 10 metals of the periodic table, Mo, and W supported on the hydroisomerization catalyst; and a second step of producing a hydroisomerization catalyst having a carbon content of 0.4 to 2.5% by mass by subjecting the catalyst to be treated to a coking treatment by means of a carbon-containing compound.

Disclosed herein is an activated EU-2 zeolite, including: pores having a diameter of 30 to 40 while maintaining the crystal structure of the EU-2 zeolite; and pores having a diameter of 40 to 200 , wherein the volume of the pores having a diameter of 30 to 40 is 0.01 to 0.06 cc/g, and the volume of the pores having a diameter of 40 to 200 is 0.07 to 0.4 cc/g.

Methods and catalysts are provided for performing dewaxing of diesel boiling range fractions, such as trim dewaxing, that allow for production of diesel boiling range fuels with improved cold flow properties at desirable yields. In some aspects, the methods can include use of dewaxing catalysts based on an MEL framework structure (ZSM-11) to provide improved dewaxing activity. In some aspects improved dewaxing is achieved operating at lower pressures and with higher amounts of organic nitrogen slip from hydrotreatment.

Processes and systems for converting an oxygenate feedstock to a hydrocarbon product, selectivated catalysts and processes for reducing off-spec gasoline production during start-up are provided herein.

The present invention provides a modified composite molecular sieve, and a preparation method and an application of the modified composite molecular sieve. The modified composite molecular sieve comprises SiO.sub.2 and a composite molecular sieve that comprises molecular sieve MCM-22 and zeolite A selected from at least one of ZSM-22, ZSM-23 and ZSM-48, wherein, the molecular sieve MCM-22 covers around the zeolite A. The present invention further provides a catalyst and an application of the catalyst. The catalyst comprises a carrier and a noble metal loaded on the carrier, wherein, the carrier comprises a modified composite molecular sieve that is the modified composite molecular sieve provided in the present invention or the modified composite molecular sieve obtained with the method provided in the present invention. The catalyst that utilizes the composite molecular sieve as a carrier not only can decrease the solidifying point of waxy raw oil, but also can improve the yield of liquid product, is especially applicable to the isomerization dewaxing process of lube distillate, and has an advantage of remarkably improving the viscosity index of lube base oil.

Methods for making a family of new crystalline molecular sieves designated SSZ-91 are disclosed. Molecular sieve SSZ-91 is structurally similar to sieves falling within the ZSM-48 family of molecular sieves, and is characterized as: (1) having a low degree of faulting, (2) a low aspect ratio that inhibits hydrocracking as compared to conventional ZSM-48 materials having an aspect ratio of greater than 8, and (3) is substantially phase pure.

A family of new crystalline molecular sieves designated SSZ-91 is disclosed. Molecular sieve SSZ-91 is structurally similar to sieves falling within the ZSM-48 family of molecular sieves, and is characterized as: (1) having a low degree of faulting, (2) a low aspect ratio that inhibits hydrocracking as compared to conventional ZSM-48 materials having an aspect ratio of greater than 8, and (3) is substantially phase pure.

A family of new crystalline molecular sieves designated SSZ-91 is disclosed. Molecular sieve SSZ-91 is structurally similar to sieves falling within the ZSM-48 family of molecular sieves, and is characterized as: (1) having a low degree of faulting, (2) a low aspect ratio that inhibits hydrocracking as compared to conventional ZSM-48 materials having an aspect ratio of greater than 8, and (3) is substantially phase pure.