Noble metal-modified titanium-silicon molecular sieve, its preparation method and application, and a method for direct oxidation of olefins
A technology of titanium-silicon molecular sieve and molecular sieve, which is applied in the direction of molecular sieves and base exchange compounds, molecular sieve catalysts, non-metallic elements, etc., can solve the problems of catalyst deactivation and catalytic performance deterioration of catalysts, and achieve good catalytic effects
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[0033] The aforementioned noble metal modified titanium-silicon molecular sieve of the present invention has special physical and chemical characteristic structure, high benzene adsorption capacity; the surface silicon-titanium ratio is not lower than the bulk phase silicon-titanium ratio and has the advantages of micropore size distribution in the range of 0.8-2nm. The invention has no special requirements for the preparation method of the aforementioned noble metal-modified titanium-silicon molecular sieve, as long as the noble metal-modified titanium-silicon molecular sieve with the above structure can be prepared, according to a preferred embodiment of the present invention, according to the method comprising the following steps To prepare the aforementioned noble metal modified titanium-silicon molecular sieve, the method comprises:
[0034] (1) mixing and contacting a precious metal source, an ammonia source, and optionally water to obtain a mixture;
[0035] (2) Mix the...
Embodiment 1
[0123] This example illustrates the methods and products provided by the invention.
[0124] (1) Under normal pressure and 80°C, mix hydrogen peroxide aqueous solution with deactivated titanium-silicon molecular sieve (SH-2) and contact them for 2.5 hours to obtain the first mixture, wherein the deactivated titanium-silicon molecular sieve (SH-2) The weight ratio with hydrogen peroxide is 1:8, and the solid content after mixing is 50% by weight;
[0125] (2) At 80°C and normal pressure, mix the first mixture with an aqueous ammonia solution and then contact it for 1 hour, wherein the weight ratio of the deactivated titanium-silicon molecular sieve to ammonia is 1:3, and the solid content after mixing is 30% by weight ; Then filter and wash the obtained product and dry it at 150° C. for 120 minutes to obtain a regenerated titanium-silicon molecular sieve catalyst A;
[0126] (3) Mixing and contacting noble metal source palladium chloride and ammonia water (concentration is 20%...
Embodiment 2
[0140] This example illustrates the methods and products provided by the invention.
[0141] (1) Under the condition of 60°C and normal pressure, mix the aqueous hydrogen peroxide solution with the deactivated titanium-silicon molecular sieve (SH-3) and contact them for 2.5 hours to obtain the first mixture, wherein the deactivated titanium-silicon molecular sieve (SH-3) The weight ratio with hydrogen peroxide is 1:6, and the solid content after mixing is 40% by weight;
[0142] (2) At 60°C and normal pressure, mix the first mixture with ammonia solution and then contact it for 1 hour, wherein the weight ratio of deactivated titanium silicon molecular sieve to ammonia is 1:3, and the solid content after mixing is 20% by weight ; Then filter and wash the obtained product and dry it at 150° C. for 120 minutes to obtain the regenerated titanium-silicon molecular sieve catalyst B;
[0143] (3) Mixing and contacting noble metal source palladium acetylacetonate and ammonia water (c...
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Abstract
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