Preparation and application of ZSM-5 zeolite derived from fly ash
The production of zeolite with excellent catalytic performance using low-cost feedstock has been a focus of academic and industrial attention. Synthesis of zeolite using industrial waste residue not only makes resource utilization of waste residue,but also alleviates the environmental problems caused by waste residue dumping. Here,ZSM -5 zeolite are successfully prepared by hydrothermal method using NaOH pretreated fly ash as aluminum source and part of the silicon sources. ZSM-5 zeolite synthesis did not require the introduction of NaOH to modulate the alkalinity,but required the introduction of an appropriate amount of silica sol as silicon source and tetrapropylammonium bromide ( TPABr ) as template agent. The effect of temperature,time,template and water were studied using orthogonal experiments of 9 factors 4 levels. ZSM-5 zeolite with long strips of (35-40) μm in length was synthesized under the optimized condition of crystallization time of 60 h,crystallization temperature of 190 ℃,TPABr dosage of 4. 5 g,and water dosage of 18 mL. In ethanol and acetic acid esterification to ethyl acetate,a conversion of up to 62％and a yield of 55％ over the as-synthesize catalyst were obtained at 130 ℃,90 min,acid to alcohol ratio of 1:3,and catalyst dosage of 5％.
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