Titanium silicon molecular sieve and synthesis method thereof

Abstract

A titanium-silicon molecular sieve, characterized in that the molecular sieve uses titanium, silicon, boron, and oxygen elements as its skeleton elements, and after the organic template agent molecules are removed by roasting, its molar composition is expressed as xTiO in the anhydrous form of oxides 2 :yB 2 o 3 :SiO2 2 , the value of x is 0.0005-0.04, and the value of y is 0.0036-0.0068. The synthesis method of the molecular sieve comprises the following operation steps: synthesis of intermediate crystalline materials, acid treatment, post-synthesis, and roasting to obtain the product titanium silicon molecular sieve. The molecular sieve has a good catalytic oxidation function, especially for reactions involving macromolecules.

Description

technical field [0001] The invention relates to a titanium-silicon molecular sieve and a synthesis method thereof, belonging to the technical field of inorganic chemicals and synthesis thereof. Background technique [0002] In general, "zeolite" is a general term designating crystalline porous aluminosilicates. The basic unit of zeolite structure SiO 4 and AlO 4 tetrahedron. However, since the 1980s, it has been confirmed that structures specific to or similar to the above-mentioned zeolite structures also exist in other oxides, such as aluminophosphates (US 4,310,440). [0003] In addition, the International Zeolite Association ("IZA") further defined zeolite at the 13th International Molecular Sieve Conference (http: / / www.iza-online.org / ) in 2001. According to the association's definition, zeolites include natural and synthetic zeolites, molecular sieves, and microporous, mesoporous materials with zeolite-related structures and / or properties . T...

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Problems solved by technology

[0006] Weibin Fan, Peng Wu, Seitaro Namba, and Takashi Tatsumi used acid to treat the precursor of titanium-containing molecular sieves with MWW structure, and then calcined to obtain a layered titanium-silicon molecular sieve with a structure similar to that of the MWW molecular sieve precursor (German Applied Chemistry, Angewante Chemie International Edition, 43, 236-240(2004)): piperidine and tetrabutyl titanate were dissolved in deionized water, then deboronated MWW molecular sieves were added, followed by hydrothermal treatment at 170°C for 5 days, and then the obtained product was dissolved in 2M HNO 3 Reflux treatment in the solution, and finally roasting at 550°C for 10 hours to obtain the product; the disadvantage is that the titanium source is introduced through post-treatment deboronation MWW molecular sieves, and the formation of layered titanium-silicon molecular sieves can only be achieved when the titanium content is very low. Obtain, its gel mole Si / Ti≥50, product mole Si / Ti=240

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