A phosphorus-containing or phosphorus-modified ZSM-5 molecular sieve is characterized in that in its 27Al MAS-NMR, the ratio of peak area for the resonance signal having a chemical shift of 39±3 ppm to peak area for the resonance signal having a chemical shift of 54 ppm±3 ppm is ≥1; or in its surface XPS elemental analysis, the value of n1/n2 is ≤0.1. n1 represents the mole number of phosphorus, n2 represents the total mole number of silicon and aluminum. A cracking auxiliary or cracking catalyst contains the phosphorus-containing/phosphorus-modified ZSM-5 molecular sieve can be made using the phosphorus-containing or phosphorus-modified ZSM-5 molecular sieve.

A phosphorus-containing or phosphorus-modified ZSM-5 molecular sieve is characterized in that in its 27Al MAS-NMR, the ratio of peak area for the resonance signal having a chemical shift of 39±3 ppm to peak area for the resonance signal having a chemical shift of 54 ppm±3 ppm is ≥1; or in its surface XPS elemental analysis, the value of n1/n2 is ≤0.1. n1 represents the mole number of phosphorus, n2 represents the total mole number of silicon and aluminum. A cracking auxiliary or cracking catalyst contains the phosphorus-containing/phosphorus-modified ZSM-5 molecular sieve can be made using the phosphorus-containing or phosphorus-modified ZSM-5 molecular sieve.

A phosphorus-modified MFI-structured molecular sieve is characterized in that the molecular sieve has a K value, satisfying: 70%≤K≤90%; for example, 75%≤K≤90%; further for example, 78%≤K≤85%. The K value is as defined in the specification. A cracking auxiliary or cracking catalyst contains the phosphorus-modified MFI molecular sieve.

A phosphorus-modified MFI-structured molecular sieve is characterized in that the molecular sieve has a K value, satisfying: 70%≤K≤90%; for example, 75%≤K≤90%; further for example, 78%≤K≤85%. The K value is as defined in the specification. A cracking auxiliary or cracking catalyst contains the phosphorus-modified MFI molecular sieve.

The present invention provides a method for selectively separating a straight-chain conjugated diene with high purity from a mixture containing the straight-chain conjugated diene and at least one type of straight-chain olefin. The method involves separating the straight-chain conjugated diene from the mixture containing the straight-chain conjugated diene and the straight-chain olefin using a zeolite membrane composite. The composite contains a porous support and a zeolite layer formed on the surface and in the fine pores of the support, and the zeolite contains an alkali metal cation.

The present invention provides a method for selectively separating a straight-chain conjugated diene with high purity from a mixture containing the straight-chain conjugated diene and at least one type of straight-chain olefin. The method involves separating the straight-chain conjugated diene from the mixture containing the straight-chain conjugated diene and the straight-chain olefin using a zeolite membrane composite. The composite contains a porous support and a zeolite layer formed on the surface and in the fine pores of the support, and the zeolite contains an alkali metal cation.

A metal-zeolite composition comprising: (i) a zeolite phase; and (ii) a metal, other than aluminum or silicon, nanoscopically dispersed throughout said zeolite phase, wherein, if agglomerations of said metal are present, the agglomerations have a size of no more than 1 micron, wherein the zeolite may be, for example, a dealuminated zeolite, and the metal may be selected from transition metals, main group metals, and lanthanide metals. Also described herein is a method for producing the metal-zeolite composition in which a zeolite phase and metal salt are mixed and ground by a solvent-less ball milling process to produce an initial mixture, and calcining the initial mixture to produce the metal-zeolite composition. Further described herein is a method for converting an oxygen-containing organic species to a hydrocarbon, the method comprising contacting the species with the above described metal-loaded zeolite catalyst at a temperature of at least 100° C. and up to 550° C.

A metal-zeolite composition comprising: (i) a zeolite phase; and (ii) a metal, other than aluminum or silicon, nanoscopically dispersed throughout said zeolite phase, wherein, if agglomerations of said metal are present, the agglomerations have a size of no more than 1 micron, wherein the zeolite may be, for example, a dealuminated zeolite, and the metal may be selected from transition metals, main group metals, and lanthanide metals. Also described herein is a method for producing the metal-zeolite composition in which a zeolite phase and metal salt are mixed and ground by a solvent-less ball milling process to produce an initial mixture, and calcining the initial mixture to produce the metal-zeolite composition. Further described herein is a method for converting an oxygen-containing organic species to a hydrocarbon, the method comprising contacting the species with the above described metal-loaded zeolite catalyst at a temperature of at least 100° C. and up to 550° C.

Provided is a method for preparing a zeolite having a Si/Al ratio of at least 10 by interzeolite transformation in the absence of an organic structure directing agent. The method is more cost effective and less equipment intensive as it eliminates the costly organic structure directing agent and the waste treatment at the plant.

Provided is a method for preparing a zeolite having a Si/Al ratio of at least 10 by interzeolite transformation in the absence of an organic structure directing agent. The method is more cost effective and less equipment intensive as it eliminates the costly organic structure directing agent and the waste treatment at the plant.