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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Embodiment 1
[0021] Get 1137 grams of sodium metasilicate and dissolve in 1800 grams of deionized water. In addition, 89 grams of aluminum sulfate was dissolved in 350 grams of deionized water, and added into the sodium silicate solution under stirring. After the solution was mixed evenly, 158 g of hexamethyleneimine was added under stirring. After stirring evenly, the pH value was adjusted to 11 with 30% sulfuric acid solution, and then the stirring was continued until uniform. Conventional hydrothermal crystallization was carried out 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 the MCM-56 seed crystal required by the present invention, denoted 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 MCM-56 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 29.4 grams of four Ethyl ammonium hydroxide and 19.9 grams of hexamethyleneimine (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 2O=1:0.05:0.4:40, add 3.0 g of MCM-56 seed crystal M1, put the mixed solution in an autoclave, keep it at 140°C for 40 hours, then take it out and wash it twice, dry at 120°C for 4 hours, 550 ℃ roasting for 3 hours, the ZSM-5 / mordenite / MCM-56 symbiotic material was prepared, and the XRD diffraction pattern was as follows figure 1 As shown, there are d-spacing maxima 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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