Fast water bath synthesis of Sn-Beta zeolite catalyzed glucose production of lactic acid
Aims:This paper aims to study a multi-pore Sn-Beta zeolite catalyst with mild preparation conditions,short preparation periods and good catalytic performance.Methods:Dibutyltin diacetate was used as the Sn source to combine with ethanol,tetra-ethyl-ammonium hydroxide aqueous solution and de-Al-Beta zeolites under low-temperature water bath conditions;and the Sn-Beta zeolite was obtained after calcination in a tubular furnace.The morphological structures and chemical properties of zeolites were characterized by XRD,TEM,BET,Py-IR,CO2-TPD,etc.Results:After optimizing the effects of the Sn source type,reaction medium ratio,temperature,time and Sn loading capacity on the catalytic performance of SN-Beta zeolites,5 mL water,5 mL ethanol,5 mL TEAOH and 300 mg dibutyltin diacetate were added and mixed at 60 ℃ for 6 h.A new multi-pore Sn-Beta zeolite catalyst with a lactic acid yield of 34.51％was prepared by calcination at 550℃ for 6 h after cleaning and drying.Conclusions:This study provides a quick and simple method for preparing Sn-Beta zeolites.The multi-level pore structure was successfully created during the water bath reaction.And the introduction of Sn led to the optimization of catalyst Lewis acidity,Brønsted acidity and catalyst basicity,which improved the catalytic performance of the catalyst.
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