2results about How to "Improved mass transfer properties" patented technology

The present invention belongs to the technical field of molecular sieve synthesis, and specifically discloses a method for synthesizing a multi-level hole ZSM-5 molecular sieve nanosheet with controllable b-axis thickness. Including: first, preparing seed crystals with tetrapropylammonium hydroxide and tetrabutylammonium hydroxide, the crystallization temperature is 50-70 ° C; second, after mixing tetrapropylammonium hydroxide solution with tetrabutylammonium hydroxide solution, mixing with water, tetraethyl orthosilicate and the seed crystals, stirring, then adding aluminum source solution, stirring at room temperature overnight, and obtaining mixed solution II; after ammonium fluoride is dissolved in water, it is added to mixed solution II, stirred vigorously, and then loaded into a hydrothermal crystallization kettle, crystallized at 170 ° C for 60h, centrifuged after water cooling, washed with water to neutral multiple times, dried and roasted, and prepared multi-level hole ZSM-5 molecular sieve nanosheets. The present invention uses tetrabutylammonium hydroxide, which is more affordable, as the main template, to synthesize multi-level hole ZSM-5 nanosheets with micropores and intercrystalline mesopores in situ, thereby improving the structural stability of the molecular sieve.

The application discloses a kind of nanometer silicon-based powder material surface modification material and preparation method and application, structure includes from inside to outside nanometer silicon, first silicon oxide layer, second silicon oxide layer, carbon coating layer or oxide coating layer, wherein the size of nanometer silicon is 30-200nm;Wherein the thickness of first silicon oxide layer is 2-4nm, oxygen content is 2-6wt%;Wherein the thickness of second silicon oxide layer is 1-3nm, oxygen content is 1-4wt%;Wherein the carbon content in carbon coating layer is 1-5wt%, the content of oxide in oxide coating layer is 0.1-1wt%.The application utilizes the diffusion and flow characteristics of supercritical carbon dioxide, modifies nanometer silicon-based material, can control superfine powder material surface structure by this modification method, and can realize nanometer silicon-based material surface uniform coating, improve the utilization ability of nanometer silicon-based material.