ZSM-5/mordenite/MCM-56 triphase coexisting molecular sieve and method for synthesizing same
A symbiotic molecular sieve, MCM-56 technology, applied in the direction of mercerized crystalline aluminum silicate zeolite, molecular sieve and alkali exchange compounds, chemical instruments and methods, etc., can solve the problems of low activity, single pore size of porous materials, weak acidity, etc., to achieve The effect of good catalytic performance and good technical effect
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[0020] [Example 1]
[0021] Dissolve 1137 grams of sodium metasilicate in 1800 grams of deionized water. In addition, 89 grams of aluminum sulfate was dissolved in 350 grams of deionized water, and added to the sodium silicate solution with stirring. After the solution is uniformly mixed, 158 g of hexamethyleneimine is added under stirring. After stirring, the pH is adjusted to 11 with 30% sulfuric acid solution, and then the stirring is continued until uniform, and the conventional hydrothermal crystallization is performed at 140°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 MCM-56 seed crystals required by the present invention, denoted as M1.
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[0022] [Example 2]
[0023] According to the method and content provided in Example 1, the added amount of aluminum sulfate was changed to 133.4 grams to prepare the MCM-56 seed crystal required by the present invention, which was recorded as M2.
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[0024] [Example 3]
[0025] Take 284 grams of sodium metasilicate and dissolve it into solution A with 300 grams of distilled water. Take 16.7 grams of aluminum sulfate and use 100 grams of distilled water to make solution B. Pour solution B into solution A slowly, stir vigorously, and then add 29.4 grams of four Ethyl ammonium hydroxide and 19.9 grams of hexamethylene imine (mixed template is marked 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 as: Si:Al:M : H 2O=1:0.05:0.4:40, add 3.0 g of MCM-56 seed crystal M1, put the mixed solution into the autoclave, keep it at 140℃ for 40 hours, then take it out and wash it twice, dry at 120℃ for 4 hours, 550 It is calcined at ℃ for 3 hours to obtain ZSM-5 / mordenite / MCM-56 symbiosis material. The XRD pattern is as follows figure 1 As shown, there are maximum d-spacings at 13.52, 12.26, 11.22, 9.97, 8.96, 8.82, 7.74, 6.71, 6.14, 5.14, 4.51, 3.98, 3.71,...
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