A molecular sieve having the framework structure of ZSM-5 is described comprising crystals having an external surface area in excess of 100 m.sup.2/g (as determined by the t-plot method for nitrogen physisorption) and a unique X-ray diffraction pattern.

A catalytic system containing a titanium zeolite of structure type MWW optionally containing zinc and containing at least one of an inorganic potassium salt and an organic potassium salt is provided. The catalyst system is useful in the preparation of propylene oxide.

A catalytic system containing a titanium zeolite of structure type MWW optionally containing zinc and containing at least one of an inorganic potassium salt and an organic potassium salt is provided. The catalyst system is useful in the preparation of propylene oxide.

A process for preparing an aluminum-free boron containing zeolitic material comprising the framework structure MWW (BMWW), comprising (a) hydrothermally synthesizing the BMWW from a synthesis mixture containing water, a silicon source, a boron source, and an MWW template compound obtaining the BMWW in its mother liquor, the mother liquor having a pH above 9; (b) adjusting the pH of the mother liquor, obtained in (a) and containing the BMWW, to a value in the range of from 6 to 9; (c) separating the BMWW from the pH-adjusted mother liquor obtained in (b) by filtration in a filtration device.

A process for preparing an aluminum-free boron containing zeolitic material comprising the framework structure MWW (BMWW), comprising (a) hydrothermally synthesizing the BMWW from a synthesis mixture containing water, a silicon source, a boron source, and an MWW template compound obtaining the BMWW in its mother liquor, the mother liquor having a pH above 9; (b) adjusting the pH of the mother liquor, obtained in (a) and containing the BMWW, to a value in the range of from 6 to 9; (c) separating the BMWW from the pH-adjusted mother liquor obtained in (b) by filtration in a filtration device.

A new crystalline aluminosilicate zeolite comprising a MTT framework has been synthesized that has been designated UZM-53. This zeolite is represented by the empirical formula:
M.sup.+.sub.mR.sub.rAl.sub.1-xE.sub.xSi.sub.yO.sub.z
where M represents sodium, potassium or a combination of sodium and potassium cations, R is the organic structure directing agent or agents derived from reactants R1 and R2 where R1 is diisopropanolamine and R2 is a chelating diamine, and E is an element selected from the group consisting of gallium, iron, boron and mixtures thereof. Catalysts made from UZM-53 have utility in various hydrocarbon conversion reactions such as oligomerization.

A molecular sieve material, EMM-25, having in its calcined form an X-ray diffraction pattern including the following peaks: TABLE-US-00001 d-spacing (?) Relative Intensity [100 ? I/I(o)]% 11.74-11.34 60-100 9.50-9.10 30-80 8.68-8.28 10-40 5.64-5.44 20-60 4.52-4.42 10-50 4.28-4.18 10-40 3.96-3.86 40-80 3.69-3.59 30-70

A molecular sieve material, EMM-25, having in its calcined form an X-ray diffraction pattern including the following peaks: TABLE-US-00001 d-spacing (?) Relative Intensity [100 ? I/I(o)]% 11.74-11.34 60-100 9.50-9.10 30-80 8.68-8.28 10-40 5.64-5.44 20-60 4.52-4.42 10-50 4.28-4.18 10-40 3.96-3.86 40-80 3.69-3.59 30-70

A process for preparing a tin-containing zeolitic material having an MWW-type framework structure comprising providing a zeolitic material having an MWW-type framework structure having vacant tetrahedral framework sites, providing a tin-ion source in solid form, and incorporating tin into the zeolitic material via solid-state ion exchange.

A process for preparing a tin-containing zeolitic material having an MWW-type framework structure comprising providing a zeolitic material having an MWW-type framework structure having vacant tetrahedral framework sites, providing a tin-ion source in solid form, and incorporating tin into the zeolitic material via solid-state ion exchange.