A catalyst containing a IZM-2 zeolite and a specific content of alkali metal or alkaline-earth metal compounds, and a process for the isomerization of an aromatic C8 cut using the catalyst.

The present invention discloses a molecular sieve and its preparation method. The molecular sieve has micromorphology in a football shape and consists of molecular sieve framework and active elements. The molecular sieve framework comprises silicon element and aluminum element; the active elements comprise copper element and rare earth elements. The rare earth elements are one or more selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Sc and Y. The mass ratio of the silicon element to the aluminum element is 3-9:1. The content of the copper element in the molecular sieve is 1.5-3.2 wt %. The mass of rare earth elements is 50 ppm-2 wt % of the molecular sieve framework. The mass of the silicon element is calculated by silicon dioxide, the mass of aluminum element is calculated by aluminum oxide, the mass of copper element is calculated by copper oxides, and the mass of rare earth elements is calculated by rare earth oxides. The molecular sieve has a high catalytic activity in a temperature range of 175-550° C. and a good resistance to hydrothermal aging.

A DDR-type zeolite seed crystal has an average particle diameter of less than or equal to 0.2 μm, and an average aspect ratio of less than or equal to 1.3.

A DDR-type zeolite seed crystal has an average particle diameter of less than or equal to 0.2 μm, and an average aspect ratio of less than or equal to 1.3.

The present invention relates to new crystalline zeolite SSZ-52x prepared using a quaternary ammonium cation templating agent, for example, having the structure:

##STR00001##

wherein X.sup.− is an anion which is not detrimental to the formation of the SSZ-52x. SSZ-52x is useful as a catalyst and shows improved durability, particularly with regard to NO.sub.x conversion.

The present invention relates to new crystalline zeolite SSZ-52x prepared using a quaternary ammonium cation templating agent, for example, having the structure:

##STR00001##

wherein X.sup.− is an anion which is not detrimental to the formation of the SSZ-52x. SSZ-52x is useful as a catalyst and shows improved durability, particularly with regard to NO.sub.x conversion.

A composition is provided that has heat resistance sufficient for use as a hydrocarbon adsorbent and desorbs hydrocarbons slowly with respect to an increase in temperature. The composition includes an alkali metal and a zeolite having a YFI structure. A content of the alkali metal is 1 to 40 mass% based on a total mass of the composition, and a content of the zeolite having a YFI structure is 99 to 60 mass% based on the total mass of the composition.

A DLM-1 molecular sieve, a process for preparing the molecular sieve, and use thereof in treating an organic substance are provided. The DLM-1 molecular sieve is an Al-SBA-15 molecular sieve, and has a schematic chemical composition as represented by the formula “first oxide*second oxide”. The first oxide is silica, the second oxide is alumina, and the content by mass percent of alumina in the schematic chemical composition is 2% to 85%. The DLM-1 molecular sieve is suitable for the hydrodenitrogenation reaction of heavy distillate oil, and is favorable for improving the hydrodenitrogenation activity.

A method is described for the synthesis of aluminosilicate CHA framework type molecular sieves at ambient pressure via interzeolite conversion from FAU framework type zeolites.

A method is described for the synthesis of aluminosilicate CHA framework type molecular sieves at ambient pressure via interzeolite conversion from FAU framework type zeolites.