Preparation method for hollow ZSM-5 zeolite microspheres
A technology of ZSM-5 and zeolite, which is applied in the field of preparation of ZSM-5 zeolite, can solve the problems of limited application range, large internal hollow structure size, high manufacturing cost, etc., and achieves the reduction of production cost, high mechanical strength, and avoiding operation steps Effect
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Embodiment 1
[0021] At room temperature, 0.13g of sodium aluminate (41%Al 2 o 3 , 35%Na 2 O), 1.2g of sodium hydroxide and 2g of ethylenediamine were dissolved in 86g of distilled water. After stirring and clarification, 20g of 40% silica sol was slowly added dropwise, mixed evenly, moved into a stainless steel reaction kettle, and crystallized at 180°C for 3 days. The obtained solid product was washed with distilled water to neutrality, filtered, dried, and then calcined in a muffle furnace at 550° C. for 6 hours with air to obtain hollow ZSM-5 zeolite microspheres.
[0022] figure 1 The XRD diffraction pattern of the obtained sample shows that the obtained sample is a ZSM-5 zeolite crystal phase, and no other miscellaneous crystals are formed; the scanning electron microscope characterization shows that the obtained ZSM-5 zeolite is spherical, and the sphere is formed by the interlaced growth of about 200nm×100nm crystals. In order to facilitate the observation of the internal struct...
Embodiment 2
[0024] At room temperature, 0.73g of sodium aluminate (41%Al 2 o 3 , 35%Na 2 O), 0.3g of sodium hydroxide, 5g of ethylenediamine were dissolved in 86g of distilled water, stirred and clarified, slowly added dropwise 12g of 40% silica sol, mixed evenly, moved into a stainless steel reaction kettle, and crystallized at 140°C for 6 days, The obtained solid product was washed with distilled water to neutrality, filtered, dried, and then calcined in a muffle furnace at 550° C. for 4 hours with air to obtain hollow ZSM-5 zeolite microspheres.
[0025] The XRD diffraction pattern shows that the obtained sample is a ZSM-5 zeolite crystal phase, and no other miscellaneous crystals are generated; figure 2 The scanning electron microscope characterization shows that the obtained ZSM-5 zeolite is spherical, and the sphere is formed by the interlaced growth of about 200nm×100nm crystals. The scanning electron microscope after the sample is squeezed with a pressure of 20MPa is as follow...
Embodiment 3
[0027] At room temperature, dissolve 1.65g of aluminum hydroxide, 1.12g of sodium hydroxide, and 6g of ethylenediamine in 86g of distilled water. After stirring and clarification, slowly add 10g of fumed silica, mix well, and transfer to a stainless steel reaction kettle. After 2 days of crystallization, the resulting solid product was washed with distilled water until neutral, filtered, dried, and then calcined in a muffle furnace at 550°C for 5 hours with air to obtain hollow ZSM-5 zeolite microspheres.
[0028] The XRD diffraction pattern shows that the obtained sample is ZSM-5 zeolite crystal phase, and no other miscellaneous crystals are formed; the scanning electron microscope characterization shows that the obtained ZSM-5 zeolite is spherical, and the sphere is formed by the interlaced growth of about 200nm×100nm crystals. After the sample was extruded with a pressure of 20 MPa, it was observed that the inside of the sample presented a hollow structure. Figure 4 The TE...
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