以粉煤灰为原料Fe-MCM-41的制备及对环己烷的催化氧化

The Synthesis of Fe-MCM-41 by Coal Fly Ash and the Catalysis on Cyclohexane

采用平顶山热电厂粉煤灰中所含的二氧化硅作为硅源,将其所含氧化铁作为铁源。以CTAB为模板剂,乙二胺四乙酸二钠为络合剂。用氢氧化钠调节p H值,在一定水热条件下反应,合成介孔分子筛Fe-MCM-41产品。所得产品经研磨进行XRD、FTIR、UV-Vis进行表征。结果表明,在实验条件下,分别经过60、80、100℃晶化24 h后,其中80℃下产品有较好的结晶度及介孔分子筛的结构特征。用合成的Fe-MCM-41分子筛催化氧化环己烷来考察其催化氧化性能。考察反应时间、不同温度合成催化剂等条件对环己烷催化转化率影响。并利用气相色谱进行检测反应产物各组分。实验结果,Fe-MCM-41具有催化环己烷转化的作用,在80℃合成的催化剂催化效果较好,最终得到环己酮产品。

Silicon dioxide and iron oxide contained in pingdingshan thermal power plant coal fly ash were used as silicon source and iron source respectively. And CTAB and EDTA were used as template agent and complexing agent respectively. Sodium hydroxide was added to adjust p H and compose the mesoporous molecular sieve Fe-MCM-41 after reaction under a certain water and temperature condition. It was characterized by XRD,FTIR,UV-Vis. Respectively in experiment condition,finding shows that the product crystallized at 80℃ has better crystallinity and structural feature of mesoporous molecular sieve. The Fe-MCM-41 was used as catalyst,and investigate its catalytic oxidation properties with cyclohexane reaction. The effect of response time,temperature and synthetic catalyst or other condition on the catalytic conversion rate of acyclohexane was observed and examined. Gas chromatography was used to test all components of reaction product. The experimental result suggests that Fe-MCM-41 can function as catalyzing the conversion of hexane to produce cyclohexanone,and Synthesis catalyst at 80℃ has better catalytic effect.