Method for preparing SSZ-13 molecular sieve by utilizing ZSM-5 molecular sieve through crystal transformation
A ZSM-5 and molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of high price and toxic yield, and achieve the effects of low production cost, pollution reduction and simple production process
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Embodiment 1
[0032] Embodiment 1: A kind of preparation method utilizing ZSM-5 molecular sieve to crystallize and synthesize SSZ-13 molecular sieve, comprises the following steps:
[0033] First, use KOH as the alkali source, mix 7.84g TEAOH with 0.75g KOH solid; then, take 2g ZSM-5 molecular sieve and add it into the mixture as the silicon source and the aluminum source, continue stirring for 3h and then add the seed crystal, the seed crystal quality is ZSM -5 molecular sieve mass of 0.1, after stirring evenly, a homogeneous initial gel was obtained; finally, the initial gel was transferred to a tetrafluoroethylene high-pressure reactor, and under static conditions, hydrothermal crystallization at 160°C for 3 days; the system's The gel ratio is: SiO 2 :Al 2 o 3 :K 2 O:TEAOH:H 2 O=1:0.0278:0.2:0.4:30. After the reaction was completed, the product was cooled at room temperature, filtered, washed with deionized water until neutral, and dried at 60°C for 12 hours, and the dried product w...
Embodiment 2
[0034] Embodiment 2: A preparation method for synthesizing SSZ-13 molecular sieve by crystallization of ZSM-5 molecular sieve, comprising the following steps:
[0035] First, 7.84g TEAOH was mixed with 0.934g KOH solid; then, 2g ZSM-5 molecular sieve was added to the mixture as a silicon source and an aluminum source, and after stirring for 3 hours, seed crystals were added. 0.1, after stirring evenly, a homogeneous initial gel was obtained; finally, the initial gel was transferred to a tetrafluoroethylene high-pressure reactor, and under static conditions, it was hydrothermally crystallized at 160°C for 3 days; the gel ratio of the system was: SiO 2 :Al 2 o 3 :K 2 O:TEAOH:H 2 O=1:0.0278:0.25:0.4:30. After the reaction was completed, the product was cooled at room temperature, filtered, washed with deionized water until neutral, and dried at 60°C for 12 hours, and the dried product was calcined in air at 550°C for 4 hours to finally obtain SSZ-13 Molecular sieve A2.
Embodiment 3
[0036] Embodiment 3: A preparation method for synthesizing SSZ-13 molecular sieve through crystal transformation of ZSM-5 molecular sieve, comprising the following steps:
[0037] First, 7.84g TEAOH was mixed with 0.82g KOH solid; then, 2g ZSM-5 molecular sieve was added to the mixture as a silicon source and an aluminum source, and after stirring for 3 hours, seed crystals were added. 0.01, after stirring evenly, a homogeneous initial gel was obtained; finally, the initial gel was transferred to a tetrafluoroethylene high-pressure reactor, and under static conditions, it was hydrothermally crystallized at 160°C for 3 days; the gel ratio of the system was: SiO 2 :Al 2 o 3 :K 2 O:TEAOH:H 2O=1:0.0278:0.234:0.4:30. After the reaction was completed, the product was cooled at room temperature, filtered, washed with deionized water until neutral, and dried at 60°C for 12 hours, and the dried product was calcined in air at 550°C for 4 hours to finally obtain SSZ-13 Molecular si...
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