ZSM-5/ZSM-23/Y zeolite triphase coexisting molecular sieve and method for synthesizing same
A symbiotic molecular sieve, ZSM-23 technology, applied in molecular sieves and alkali exchange compounds, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problems of low activity, single pore size of porous materials, weak acidity, etc. The effect of good catalytic performance and good technical effect
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Embodiment 1
[0021] Get 1137 grams of sodium metasilicate and dissolve in 1800 grams of deionized water. In addition, 267 grams of aluminum sulfate was dissolved in 350 grams of deionized water, and added into the sodium silicate solution under stirring. After stirring evenly, adjust the pH value to 11 with 30% sulfuric acid solution, then continue to stir until uniform, and carry out conventional hydrothermal crystallization at 120° C. for 15 hours. After washing, the product was dried at 130°C for 4 hours and calcined at 550°C for 3 hours to obtain the Y zeolite seed crystal required by the present invention, which was designated as M1.
Embodiment 2
[0023] According to the method and content provided in Example 1, the amount of aluminum sulfate added was changed to 133.4 grams to obtain the Y zeolite seed crystal required by the present invention, which was denoted as M2.
Embodiment 3
[0025] Take 284 grams of sodium metasilicate, dissolve it into solution A with 300 grams of distilled water, take 16.7 grams of aluminum sulfate, and make solution B with 100 grams of distilled water, slowly pour B solution into A solution, stir vigorously, and then add 12.2 grams of B Diamine and 14.2 grams of pyrrolidine (the mixed template agent is denoted as M), after stirring for a period of time, adjust the pH value at 11 with dilute sulfuric acid, and control the molar ratio of the sol: Si: Al: M: H 2 O=1:0.05:0.4:40, add 3.0 g of Y zeolite seed crystal M1, put the mixed solution in an autoclave, keep it at 150°C for 40 hours, then take it out and wash it twice, dry at 120°C for 4 hours, Roasting for 3 hours, the ZSM-5 / ZSM-23 / Y zeolite intergrowth material was obtained, and the XRD diffraction pattern is as follows figure 1As shown, there are d-spacing maxima at 14.52, 11.22, 10.1, 9.97, 7.87, 5.98, 5.71, 5.59, 4.53, 3.90, 3.71, 3.54, 3.43, 2.99, 2.86, 2.53 Angstroms. ...
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