Liu, Shuzhen, et al. Journal of Porous Materials 15 (2008): 295-301.
Octahedral zeolite is a very important zeolite material with a wide range of applications in the industrial field. In order to reduce the synthesis cost and environmental pollution of EMT zeolite, the main method currently used is to reduce the amount of high-cost and highly toxic organic templates. This paper proposes a new method for synthesizing EMT-rich octahedral zeolite using low-cost polyquaternary ammonium salt organic templates.
Synthesis of EMT-rich Faujasite Zeolites
1. Dissolve 0.283 g of aluminum hydroxide and 1.006 g of sodium hydroxide in 2.70 ml of distilled water, and then add 4.30 ml of water glass (Na2O/Al2O3/SiO2/H2O molar ratio is 16.0/1.0/15.0/320) under stirring. After stirring for 10 minutes, age at room temperature for 24 hours to obtain an aluminum silicate solution.
2. Mix different amounts of polyquaternium salt with 5.00 ml of water glass and 2.70 ml of distilled water, and then add 0.69 ml of the aluminosilicate solution obtained in step 1, 1.19 ml of NaAlO2 and NaOH solution (Al2O3: 1.02 mol L-1; Na2O: 2.18 mol L-1), and 1.15 ml of Al2(SO4)3 solution (Al2O3: 0.88 mol L-1). The molar ratio of the aluminosilicate gel obtained is 3.3 Na2O/1.0 Al2O3/10.0 SiO2/250 H2O.
3. After stirring at room temperature for 2 hours, the aluminosilicate gel obtained in step 2 was transferred to a steel-stainless steel autoclave and crystallized at 100-110 °C for 2-14 days. The obtained solid was filtered, washed with distilled water, dried at room temperature, and calcined in air at 550 °C for 3 hours to remove the organic template.
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