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首页> 外文期刊>Catalysis science & technology >Discussing the performance of beta zeolites in aqueous-phase valorization of xylose
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Discussing the performance of beta zeolites in aqueous-phase valorization of xylose

机译：讨论β沸石的性能水相稳定物价的木糖

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The one-pot transformation of xylose into furfuryl alcohol over beta zeolites was shown to proceed via a tandem reaction. In the present work, the influence of acid site balance in the xylose conversion was systematically investigated, using BEA structured catalysts with different Si/Al ratios. Special attention was given to the catalyst acidity regarding the tolerance to water. These sites were assessed by FTIR spectroscopy of pyridine adsorbed on hydrated catalysts and compared to values for conventional dehydrated BEA zeolites. Activity results were mainly associated with total acid sites while selectivity to furfuryl alcohol could be explained by balance of water-tolerant Lewis (WT-LAS) and Bronsted (BAS) acid sites. The closer to 1 the WT-LAS/BAS ratio, the higher the selectivity to furfuryl alcohol. XRD, ICP-OES and NMR-HPDec results for spent zeolites showed that the BEA structure and chemical composition were well preserved when the catalytic test was performed at 130 degrees C. The activity was also seen to be very similar after two consecutive runs. However, this chemical stability was limited under mild conditions since increasing the reaction temperature to 150 degrees C and 170 degrees C led to Al leaching. Despite being susceptible to deactivation by deposition of carbonaceous material, BEA zeolites could be promptly regenerated by calcination with no impact on activity or product distribution.
机译：木糖的锅转变成糠醇酒精对β沸石进行通过一个串联反应。木糖酸网站平衡的影响转换系统调查,使用BEA结构化催化剂具有不同的硅/铝比率。催化剂酸性的宽容水。光谱学的吡啶吸附水分传统的催化剂相比,值脱水BEA沸石。主要与总酸相关网站糠醇可以选择性通过对水平衡刘易斯来解释(WT-LAS)和布仑斯惕(BAS)酸网站。接近1 WT-LAS / BAS比率越高糠醇的选择性。NMR-HPDec花了沸石的结果显示BEA的结构和化学成分保存完好的催化测试时在130度c活动也被执行的看到两个连续后非常相似运行。在温和条件下自增加有限反应温度150摄氏度和170度导致铝浸出。容易失活的沉积碳质材料,BEA沸石及时通过煅烧没有再生对活动或产品分布的影响。

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