42results about "Ferrosilicates" patented technology

The present disclosure provides a sound absorbing material. The sound absorbing material comprising a heteroatom zeolite molecular sieve comprising a framework and an extra-framework cation, the framework comprising SiO2 and a metal oxide MxOy comprising a metal element M, wherein the framework has a molar ratio of Si / M between 250 to 500, wherein the M includes Fe, and that the extra-framework cation is at least one of a monovalent copper ion, a monovalent silver ion, a monovalent gold ion, an alkali metal ion or an alkaline earth metal ion. The sound absorbing material provided by the present disclosure, sound absorbing material to have better oxygen adsorption capacity, good waster repellency and stability. When such a sound absorbing material is applied to a speaker box, the speaker box will have better low frequency acoustic performance and better reliability.

The invention provides a sound absorbing material. The material comprises an MEL structure molecular sieve, the MEL structure molecular sieve comprises a skeleton and a skeleton outer cation, the skeleton comprises silicon oxide and an oxide MxOy of an element M containing a non-silicon element, the skeleton is characterized in that the mass ratio of Si / M in the skeleton is at least 80, the skeleton outer cation comprises at least one of a hydrogen ion, an alkali metal ion, an alkaline earth metal ion and a transition metal ion, and the content of the skeleton outer cation is between 0.05 wt.% and 1.5wt. %. The invention also provides a speaker using the sound absorbing material. Compared with the prior art, the sound absorbing material of the molecular sieve of the MEL structure is addedto the speaker, which can significantly improve the low frequency performance of the speaker, and the sound absorbing material has strong resistance to performance degradation in practical applications.

The invention relates to: a β-type iron silicate which has a fluorine content not more than 400 ppm by weight on a dry basis and in which the crystal grains have a truncated square bipyramidal morphology in an examination with a scanning electron microscope and the whole or part of the iron is contained in the β-type framework structure, and a process for producing the iron silicate; anther β-type iron silicate, and a process for producing the iron silicate; and a nitrogen oxide removal catalyst containing the other β-type iron silicate, a process for producing the catalyst, and a method for nitrogen oxide removal with the catalyst.

The invention relates to a DDR zeolite molecular sieve synthesis method. In the prior art, the organic template for DDR zeolite molecular sieve synthesis is expensive and the crystal size of the DDR molecular sieve is too large. A purpose f the present invention is mainly to solve the problems in the prior art. According to the technical scheme, commercially available dimethyldiisopropylamine DMDIPA<+> is used as a templating agent, and a mixture is subjected to hydrothermal crystallization for 8-350 h at a temperature of 90-220 DEG C according to a ratio of DMDIPA<+> to YO2 to M2O to X2O3 toH2O of 0.05-1.0:1:0-0.75:0-0.1:1-100 to obtain a porous crystallized DDR zeolite molecular sieve material, wherein Y is at least a skeleton tetravalent element, X is at least a skeleton trivalent element, and M is an alkali metal element. According to the present invention, the cost of the used templating agent is low, the synthesized DDR zeolite molecular sieve has a small crystal grain size, andthe method has characteristics of simple operation, wide synthesis range and convenient promotion.

The invention relates to the field of the fine chemical industry, in particular to a method for processing a cyclohexane oxidation solution. The method comprises the step that the cyclohexane oxidation solution makes contact with a catalyst, wherein the catalyst contains a silicon-containing molecular sieve, and the cyclohexane oxidation solution contains cyclohexyl hydroperoxide. A preparation method of the silicon-containing molecular sieve comprises the steps that 1, a silicon source, a group VIII metal source and a structure guide agent are hydrolyzed to obtain a hydrolyzed material; 2, the hydrolyzed material is crystallized, wherein the group VIII metal source is an iron source or a mixture of the iron source and a cobalt source, and step 1 is conducted in the presence of an organophosphorus compound and / or before step 2, crystallization is conducted after the hydrolyzed material and the organophosphorus compound are mixed. The silicon-containing molecular sieve is used for processing the cyclohexane oxidation solution, extra alkaline reagents do not need to be added, the effects of a high alcohol-ketone ratio and high alcohol-ketone selectivity can be obtained at low temperature, and the method is high in industrial application value.

The present invention provides a titanium-silicalite molecular sieve and a method for preparing the same. The method includes the steps of preparing a mixture of a titanium source, a silicon source, a transition metal source, a template agent and water; heating the mixture to form a gel mixture; heating the gel mixture in a water bath; and calcining the gel mixture after the gel mixture in the water bath to form the titanium-silicalite molecular sieve. The present invention further provides a method for preparing cyclohexanone oxime by using the titanium-silicalite molecular sieve as the catalyst which results in high conversion rate, high selectivity and high usage efficiency of hydrogen peroxide.