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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Microwave-Assisted Two-Step Process for the Synthesis of a Single-Phase Na-A Zeolite from Coal Fly Ash
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Microwave-Assisted Two-Step Process for the Synthesis of a Single-Phase Na-A Zeolite from Coal Fly Ash

机译：微波辅助两步法从粉煤灰合成单相Na-A沸石

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摘要

Using the amorphous aluminosilicate of coal fly ash (FA),a single phase Na-A zeolite was synthesized.The FA was pretreated in NaOH solution by refluxing under microwave irradiation for 3600 s (1 h).After the pretreatment,the remaining FA was filtered off and NaOH-NaAlO2 solutions were added into the residual solution to control the SiO2/Al2O3 molar ratio ranging from 0.4 to 10.0.The precipitates thus formed were aged at 358 K for 24 h in an air oven.The amorphous aluminosilicate of FA was dissolved during the pretreatment and its dissolution rate is much faster than that using a conventional air oven.When the NaOH-NaAlO2 solution was added into the solution after the pretreatment and men aged at 358 K for 24 h,white precipitates were yielded over the whole SiO2/Al2O3 range.At SiO2/Al2O3 = 0.4-0.8,the materials formed were identified as a single-phase Na-A zeolite.The cation-exchange capacity of a single-phase Na-A zeolite formed at SiO2/Al2O3 =0.8 was 508 cmol/kg,which is close to the 550 cmol/kg of the commercial Na-A zeolite.The hydroxysodalite and Na-X zeolite were produced at SiO2/Al2O3 >= 1.0.
机译：用粉煤灰（FA）的无定形硅铝酸盐合成单相Na-A沸石，将其在NaOH溶液中微波辐射回流3600 s（1 h）进行预处理，预处理后剩余的FA为滤出并将NaOH-NaAlO2溶液加入到残留溶液中，以控制SiO2 / Al2O3的摩尔比在0.4至10.0之间，由此形成的沉淀物在358 K的空气烘箱中老化24 h.FA的无定形硅铝酸盐为在预处理过程中溶解，溶解速度比传统的空气烤箱快得多。在预处理后向溶液中加入NaOH-NaAlO2溶液，并在358 K老化24 h的情况下，整体上产生白色沉淀SiO2 / Al2O3的范围是508 cmol / kg，接近550 cmol / kg的市售Na-A沸石。生产的SiO2 / Al2O3> = 1.0的羟基钠钙石和Na-X沸石。

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