The present invention relates to a process for hydroxylation of a compound of formula (I) by reacting the compound of formula (I) with an oxidizing agent, in the presence of a titanium silicalite zeolite prepared by crystallization preceded by a maturing step. The present invention also relates to a titanium silicalite zeolite and to the process for preparing same.

A process for the preparation of C.sub.4 oxygenate compounds such as threose, erythrose or erythrulose starting from a composition comprising C.sub.1-3 oxygenate compounds such as formaldehyde, glycolaldehyde, glyoxal, pyruvaldehyde or acetol, wherein the process is carried out in the presence of a crystalline microporous material having a ring pore structure selected from an eight-membered ring pore structure or a ten-membered ring pore structure.

Disclosed herein is a method for producing a zeolite, zeolite-like or zeotype structure with selective formation of metal, metal oxide or metal sulphide nanoparticles and/or clusters inside the zeolite, zeolite-like or zeotype structure.

The present invention relates to a process for the preparation of a zeolitic material comprising the steps of: (1) providing a mixture comprising one or more sources for YO.sub.2 and one or more alkenyltrialkylammonium cation R.sup.1R.sup.2R.sup.3R.sup.4N.sup.+-containing compounds as structure directing agent; and (2) crystallizing the mixture obtained in step (1) to obtain a zeolitic material; wherein Y is a tetravalent element, and wherein R.sup.1, R.sup.2, and R.sup.3 independently from one another stand for alkyl; and R.sup.4 stands for alkenyl, as well as to zeolitic materials which may be obtained according to the inventive process and to their use.

A composition of matter is provided comprising hierarchically ordered crystalline microporous material having well-defined long-range mesoporous ordering of lamellar symmetry. The composition possesses mesopores having walls of crystalline microporous material and a mass of mesostructure between mesopores of crystalline microporous material. Long-range ordering is defined by presence of secondary peaks in an X-ray diffraction (XRD) pattern and/or lamellar symmetry observable by microscopy.

The present disclosure is directed to large-pore germanosilicate compositions designated CIT-13/OH and CIT-14/IST, the two large-pore germanosilicate each having a three-dimensional framework with 10- and 14-membered ring channels and 8- and 12-membered ring channels, respectively. The disclosure also sets forth methods for converting the former to the latter under conditions consistent with an inverse sigma transformation. Uses of the large-pore germanosilicate compositions are also disclosed.

The present application discloses a method for preparing a hierarchical porous TS-1 molecular sieve, which uses a silicon-titanium ester polymer as both titanium source and silicon source. In the method, silicon and titanium are uniformly connected to a same polymer, and the hydrolysis rates thereof are equivalent during hydrolysis, which can prevent TiO.sub.2 precipitation and reduce the generation of non-framework titanium. Further, the silicon-titanium ester polymer is not only used as both silicon source and titanium source, but also can be used as mesoporous template in the synthesis process. The obtained TS-1 molecular sieve has mesoporous structure with narrow pore size distribution, which plays an important role in promoting the application of TS-1 molecular sieve in the field of catalysis.

The present application discloses a method for preparing a hierarchical porous TS-1 molecular sieve comprising using a silicon-titanium ester polymer as both titanium source and silicon source. In the method, silicon and titanium are uniformly connected to a same polymer, and the hydrolysis rates thereof are equivalent during hydrolysis, which can prevent TiO.sub.2 precipitation and reduce the generation of non-framework titanium. Further, the silicon-titanium ester polymer is not only used as both silicon source and titanium source, but also can be used as a mesoporous template in the synthesis process. The obtained TS-1 molecular sieve has mesoporous structure with narrow pore size distribution.

The disclosed is a sound-absorbing microsphere, method and a speaker. The sound-absorbing microsphere is composed of molecular sieves and adhesives. The sound-absorbing microsphere includes a spherical body and one or more hollow structures formed by depressions on a surface of the spherical body. A maximum depth or width of the hollow structure is 2% to 50% of a diameter of the spherical body. One or more hollow structures connected to the outside are fabricated on the sound-absorbing microsphere, such that the microsphere has a larger effective surface area capable of absorbing more gas molecules, thereby achieving better sound-absorbing effects. By filling the sound-absorbing microsphere into the speaker, better frequency reduction effects are achieved, and the sound performance is significantly improved. The sound-absorbing microsphere according to the present disclosure has a larger effective surface area, such that the effects of frequency reduction are bettered, and the sound performance is improved.

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.