A method for the synthesis of siliceous or heteroatom-substituted MFI zeolites (M-MFI; M=Si, Ti, Nb, or Ta) with tunable densities of SiOH that depend simply on the ratio of hydrofluoric acid (HF) to structure-directing agent (SDA; tetrapropylammonium hydroxide) used within the synthesis gel. The equilibrated ion exchange between OH.sup.− and F.sup.− ions forms tetrapropylammonium fluoride in situ, which does not lead to the formation of SiOH defects within M-MFI. Comparisons of infrared spectra from 15 distinct M-MFI materials show that the densities of SiOH groups within M-MFI decrease linearly with the ratio of HF:SDA, independent of the identity of the heteroatom within the framework.

The present invention relates to a process for the rapid synthesis of an AFX-structure zeolite comprising at least: i) mixing, in an aqueous medium, a FAU-structure zeolite having an SiO.sub.2 (FAU)/Al.sub.2O.sub.3 (FAU) molar ratio of between 2.00 and 100, a nitrogen-containing organic compound R, at least one source of at least one alkali and/or alkaline-earth metal M of valence n, with the following molar composition: (SiO.sub.2 (FAU))/(Al.sub.2O.sub.3 (FAU)) between 2.00 and 100, H.sub.2O/(SiO.sub.2 (FAU)) between 1 and 100, R/(SiO.sub.2 (FAU)) between 0.01 and 0.6, M.sub.2/nO/(SiO.sub.2(FAU)) between 0.005 and 0.45, wherein SiO.sub.2 (FAU) denotes the amount of SiO.sub.2 provided by the FAU zeolite and Al.sub.2O.sub.3(FAU) denotes the amount of Al.sub.2O.sub.3 provided by the FAU zeolite, until a homogeneous precursor gel is obtained; ii) hydrothermally treating said precursor gel obtained at the end of step i) under autogenous pressure at a temperature of between 120° C. and 250° C., for 4 to 12 hours.

The present disclosure is directed to novel germanosilicate compositions and methods of producing and using the same. In particular, this disclosure describes new germanosilicates of CIT-14 topology. The disclosure also describes methods of preparing and using these new germanosilicate compositions as well as the compositions themselves.

The method for manufacturing a modified aluminosilicate includes a first step of treating an aluminosilicate with an acid, a second step of primarily calcining the treated material obtained in the first step at 550° C. to 850° C., and a third step of contacting the calcined material obtained in the second step with a liquid containing one or more Group 4 elements and/or Group 5 elements, and then drying and secondarily calcining the resultant. The modified aluminosilicate includes one or more Group 4 elements and/or Group 5 elements, and exhibits an absorbance at 300 nm in an ultraviolet visible spectrum of 1.0 or higher. The method for manufacturing aromatic dihydroxy compounds includes reacting a phenol with hydrogen peroxide in the presence of a specific modified aluminosilicate.

JMZ-1S, a silicoaluminophosphate molecular sieve having a CHA structure and containing a trimethyl(cyclohexylmethyl)ammonium cation cation is described. A calcined product, JMZ-1SC, formed from JMZ-1S is also described. Methods of preparing JMZ-1S, JMZ-1SC and metal containing calcined counterparts of JMZ-1SC are described along with methods of using JMZ-1SC and metal containing calcined counterparts of JMZ-1SC in treating exhaust gases and in converting methanol to olefines.

A metal-containing chabazite zeolite, which has an FTIR peak area ratio between the peak at 900-1300 cm.sup.−1 (Si—O—Si asymmetric stretch) and the peak at 765-845 cm.sup.−1 (˜805 cm.sup.−1 is Si—O—Si symmetric stretch) of at least 55. A method for preparing metal-containing CHA zeolites with high SCR activity at low reaction temperatures from alkali cation-free reaction mixtures that contain the three OSDA structures: metal-polyamine, N,N,N-trimethyl-1-adamantyl ammonium (TMAda+) and TMAOH. The metal-containing CHA zeolites produced by the disclosed method can be identified by XRD, FTIR spectroscopy, FT-VIS spectroscopy, and scanning electron microscopy. A method of selective catalytic reduction of NOx in exhaust gas using the material described herein is also disclosed.

Embodiments of the present disclosure relate to zeolites and method for making such zeolites. According to embodiments disclosed herein, a zeolite may have a microporous framework including a plurality of micropores having diameters of less than or equal to 2 nm and a plurality of mesopores having diameters of greater than 2 nm and less than or equal to 50 nm. The microporous framework may include an MFI framework type. The microporous framework may include silicon atoms, aluminum atoms, oxygen atoms, and transition metal atoms. The transition metal atoms may be dispersed throughout the entire microporous framework.

The present disclosure is directed to novel germanosilicate compositions and methods of producing the same. In particular, this disclosure describes new silica-rich compositions of the germanosilicate designated CIT-13, with and without added metal oxides. The disclosure also describes methods of preparing and using these new germanosilicate compositions as well as the compositions themselves.

The present disclosure is directed to novel germanosilicate compositions and methods of producing and using the same. Included among the new materials are the new germanosilicates of CIT-5 topology having Si:Ge ratios either in a range of from 3.8 to 5.4 or from 30 to 200, with and without added metal oxides. The disclosure also describes methods of preparing and using these new germanosilicate compositions as well as the compositions themselves.

It relates to a microporous aluminotitanosilicate crystalline zeolite, method of preparation and applications thereof. It extends to a catalytic hydroxylation, by reaction of a compound of formula (I) with H.sub.2O.sub.2 in the presence of a catalyst comprising the zeolite.

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