Method for preparing catalyst of containing MFI structured molecular sieve
A molecular sieve and gas phase technology, which is applied in the field of molecular sieve catalyst preparation, can solve the problems such as the preparation method of non-microspherical catalyst that has not yet been seen, and achieve the effects of high conversion rate, good regeneration performance and good selectivity.
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example 1
[0030] This example illustrates the first preparation of the alkaline silica sol binder used in the present invention.
[0031] Add 1500 grams of distilled water and 8 grams of reagent-grade sodium hydroxide solid into the reaction tank, heat up to 65°C, add 200 grams of silicon powder (product of Tianjin Chemical Plant, 180-240 mesh, more than 98% silicon content) under stirring, control When the temperature is below 85°C, stir and react for 2-3 hours. When the pH drops to 8-10, cool to 50°C while stirring, filter, and concentrate to its SiO 2 Content of 25-45% is the alkaline silica sol used in the present invention, abbreviated as silica sol-1. Its physical and chemical properties and the content of various metal ion impurities contained therein are listed in Table 1, wherein the metal ion content is measured by plasma-coupled mass spectrometry (the same below).
example 2
[0033] This example illustrates a second preparation method for the alkaline silica sol binder used in the present invention.
[0034]The silica sol that will make according to example 1 passes through acrylic acid type weakly acidic cation exchange resin (Shanghai Resin Factory product, trade number 724) successively with the flow rate of 30ml / h # ) and styrene-type weakly basic anion exchange resin (product of Shanghai Resin Factory, trade number 704 # ) to remove most of the impurity ions therein, then adjust its pH to 8-10 with ammonia water, concentrate to its SiO 2 The content of 25-45% is the alkaline silica sol used in the present invention, which is abbreviated as silica sol-2. Its physical and chemical properties and the content of various metal ion impurities contained therein are listed in Table 1.
example 3
[0036] This example illustrates the preparation of the alkaline silica sol binder used in the present invention.
[0037] With 30 grams of water glass (Qingdao Ocean Chemical Factory product, modulus is 3.5, Na 2 O content 7%,) after diluting with 600 gram distilled waters, filter to remove impurity, pass through acrylic acid type weakly acidic cation exchange resin (Shanghai Resin Factory product, brand name 724) successively with the flow rate of 30ml / h # ) and styrene-type weakly basic anion exchange resin (product of Shanghai Resin Factory, trade number 704 # ) to remove most of the impurity ions therein, then adjust its pH to 8-10 with ammonia water, concentrate to its SiO 2 The content of 25-45% is the alkaline silica sol used in the present invention, which is abbreviated as silica sol-3. Its physical and chemical properties and the content of various metal ion impurities contained therein are listed in Table 1.
[0038] Table 1
[0039] example
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