A method of making a molecular sieve may include: reacting a source selected from the group consisting of: a source of a tetrahedral element in the presence of a structure directing agent (SDA) selected from the group consisting of: Ar.sup.+-L-Ar, Ar.sup.+-L-Ar-L-Ar.sup.+, Ar.sup.+-L-Ar-L-NR3.sup.+, and ArAr.sup.+-L-Ar.sup.+Ar, where Ar.sup.+ is to a N-containing cationic aromatic ring, Ar is to a non-charged aromatic ring, L is a methylene chain of 3-6 carbon atoms, NR3.sup.+ is to a quaternary ammonium, and ArAr.sup.+ and Ar.sup.+Ar are a fused aromatic ring structure comprising both a N-containing cationic portion and a non-charged portion, to produce the molecular sieve.

Disclosed is a catalyst capable of producing an olefin from an alkyl halide, the catalyst comprising a silicoaluminophosphate (SAPO) having a chabazite zeolite structure with the following chemical composition (Si.sub.xAl.sub.yP.sub.z)O.sub.2, where x, y, and z represent the mole fractions of silicon, aluminum, and phosphorus, respectively, present as tetrahedral oxides, x is 0.01 to 0.30 and the sum of x+y+z is 1, and where the catalyst comprises silicon tetrahedral oxides that are connected with three or less aluminum tetrahedral oxide as shown by .sup.29Si magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy peak(s) with peak(s) maxima between −93 ppm and −115 ppm.

Disclosed is a catalyst capable of producing an olefin from an alkyl halide, the catalyst comprising a silicoaluminophosphate (SAPO) having a chabazite zeolite structure with the following chemical composition (Si.sub.xAl.sub.yP.sub.z)O.sub.2, where x, y, and z represent the mole fractions of silicon, aluminum, and phosphorus, respectively, present as tetrahedral oxides, x is 0.01 to 0.30 and the sum of x+y+z is 1, and where the catalyst comprises silicon tetrahedral oxides that are connected with three or less aluminum tetrahedral oxide as shown by .sup.29Si magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy peak(s) with peak(s) maxima between −93 ppm and −115 ppm.

STA-20, a molecular sieve having a new framework type, is described. STA-20AP (as prepared) can have an alkyl amine, such as trimethylamine, and 1,6-(1,4-diazabicyclo[2.2.2]octane) hexyl cations (from diDABCO-C6) as SDAs. A lower alkyl ammonium hydroxide, such as tetrabutylammonium hydroxide, can be used as a pH modifier for making SAPO STA-20. A calcined product, STA-20C, formed from as made STA-20 is also described. Methods of preparing STA-20, activating STA-20 by calcination, and metal containing calcined counterparts of STA-20 are described along with methods of using STA-20 and metal containing calcined counterparts of STA-20 in a variety of processes, such as treating exhaust gases and converting methanol to olefins are described.

The invention relates to a method of preparing SAPO-56, (AFX) using a lower alkyl amine, preferably trimethylamine, and a 1,4-diazabicyclo [2.2.2]octane derivative, preferably comprising either 1,4-(1,4-diazabicyclo[2.2.2]octane)butyl cations or 1,5-(1,4-diazabicyclo[2.2.2]octane)pentyl cations, as structure directing agents (SDAs). A lower alkyl ammonium hydroxide, such as tetrabutylammonium hydroxide (TBAOH), can be used to control the pH. The invention also relates to SAPO-56 comprising a lower alkyl amine, such as trimethylamine, and a 1,4-diazabicyclo [2.2.2]octane derivative, such as a compound comprising either 1,4-(1,4-diazabicyclo[2.2.2]octane)butyl cations or 1,5-(1,4-diazabicyclo[2.2.2]octane) pentyl cations.

A SAPO-34 molecular sieve and method for preparing the same, whose chemical composition in the anhydrous state is expressed as: mSDA.(Si.sub.xAl.sub.yP.sub.z)O.sub.2, wherein m is 0.08-0.3, x is 0.01-0.60, y is 0.2-0.60, z is 0.2-0.60, and x+y+z=1. The template agent SDA is in micropores of the molecular sieve. SDA is an organic amine with the structural formula (CH.sub.3).sub.2NRN(CH.sub.3).sub.2, wherein R is a saturated straight-chain or branched-chain alkylene group with having from 2-5 carbon atoms. There is a slight Si enrichment phenomenon on the crystal surface of the molecular sieve crystal, and the ratio of the surface Si content to the bulk Si content of the crystal ranges from 1.50-1.01. Said SAPO-34 molecular sieve, after being calcined at a temperature range from 400-700° C. in air, can be used as a gas adsorbent and catalyst for an acid-catalyzed reaction or oxygenate to olefin reaction.

A method for synthesizing small crystals of silicoaluminophosphate-34 (SAPO-34) molecular sieves with high structural purity. The method includes first forming a slurry comprising monoisopropanolamine. Then, the slurry is aged to form an aged slurry. Finally, crystallization of silicoaluminophosphate molecular sieves comprising the SAPO-34 molecular sieves is induced from the aged slurry.

The invention concerns a process for preparing a copper-comprising SAPO material with AFX structure, comprising at least the steps of mixing, in an aqueous medium, at least one aluminum source, at least one silicon source, at least one copper source, at least one phosphorus source, a TETA complexing agent and a TMHD structuring agent, in order to obtain a gel, and hydrothermal treatment of said gel with a shear rate of less than 50 s.sup.−1 in order to obtain crystallization of said copper-comprising SAPO material with AFX structure.

A novel silicoaluminophosphate molecular sieve has a schematic chemical composition, expressed on a molar basis, of mSiO.sub.2.Al.sub.2O.sub.3.nP.sub.2O.sub.5, in which m represents the molar ratio of SiO.sub.2 to Al.sub.2O.sub.3 and is in a range of about 0.005-0.15, and n represents the molar ratio of P.sub.2O.sub.5 to Al.sub.2O.sub.3 and is in a range of about 0.7-1.1. The silicoaluminophosphate molecular sieve has a unique X-ray diffraction pattern, and can be used as an adsorbent, a catalyst or a catalyst carrier.

A crystalline material contains oxygen, aluminum and phosphorus, and has powder X-ray diffraction peaks shown below. When the peak at 2θ=14.17±0.2° is used as the reference peak and the intensity of the reference peak is set to 100, for example, the relative intensity of the peak at 2θ=8.65±0.2° is 1 to 15. The relative intensity of the peak at 2θ=9.99±0.2° is 1 to 15. The relative intensity of the peak at 2θ=16.52±0.2° is 5 to 80. The relative intensity of the peak at 2θ=17.37±0.2° is 1 to 15. The relative intensity of the peak at 2θ=21.81±0.2° is 10 to 80.