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以多孔阳极氧化铝(AAO)为基体,采用直接法和后合成法制备填料型固体酸催化剂AAO/SBA-15-SO3H。用红外光谱法分析催化剂制备过程中表面基团的变化,结果表明,两种方法制备的催化剂均含有质子酸中心-SO3H。SEM和TEM结果表明SBA-15在AAO介孔结构中呈柱状垂直基体生长。催化木糖脱水制糠醛实验表明直接法制备的催化剂具有较高的催化活性,木糖转化率可达90%以上,催化剂选择性达到74%。超声振动法表明直接法制备的填料型催化剂具有较好的机械附着稳定性,在40kHz频率下超声1h后催化剂质量减少不到5%。活性再生实验表明使用H2O2再生后催化剂活性能够基本恢复。
Porous anodic aluminum oxide (AAO) was used as matrix to prepare AAO / SBA-15-SO3H filler solid-state catalyst by direct method and post-synthesis method. The changes of surface groups during the preparation of the catalyst were analyzed by infrared spectroscopy. The results showed that the catalysts prepared by the two methods all contain the protonic acid center -SO3H. The SEM and TEM results showed that the SBA-15 columnar vertical matrix growth in the AAO mesoporous structure. The catalytic dehydration of xylose to furfural shows that the catalyst prepared by the direct method has a high catalytic activity, the xylose conversion rate of up to 90%, the catalyst selectivity of 74%. Ultrasonic vibration method shows that the filler-type catalyst prepared by direct method has good mechanical attachment stability, and the mass of the catalyst is reduced by less than 5% after being sonicated at the frequency of 40 kHz for 1 hour. Regeneration experiments show that the activity of the catalyst can be basically recovered after regeneration with H2O2.