1-Butyl-3-methylimidazolium bromide functionalized zeolites: nature of interactions and catalytic activity for carbohydrate conversion to platform chemicals,Reaction Chemistry & Engineering

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1-Butyl-3-methylimidazolium bromide functionalized zeolites: nature of interactions and catalytic activity for carbohydrate conversion to platform chemicals
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2020-07-14 , DOI: 10.1039/d0re00277a
Santosh Kumar Yedla _{1,

2,

3,

4} , Bharath Velaga _{1,

2,

3,

4} , Souradip Choudhury _{1,

2,

3,

4} , Ashutosh Namdeo _{4,

5,

6} , Animes Kumar Golder _{1,

2,

3,

4} , Nageswara Rao Peela _{1,

2,

3,

4}

Affiliation

In this study, 1-butyl-3-methylimidazolium bromide ([BMIM]Br) functionalized zeolites were synthesized by a facile ship-in-bottle strategy. The interactive effects between [BMIM]Br and zeolites were studied in detail to explore their synergy in catalyzing the reaction of carbohydrate conversion to specific platform chemicals (5-hydroxymethylfurfural (5-HMF) and furfural). The functionalized zeolites were characterized thoroughly using various techniques to determine the [BMIM]Br presence and its effect on zeolite properties. The [BMIM]Br in functionalized zeolites decomposed in two stages and possessed higher thermal stability compared to its bulk counterpart. The decomposition temperature of the IL varies with the zeolite framework type and cation. The increase in the electron density at the oxygen and aluminum sites affected the bond angle of –[Si–O–Al]– as observed from XPS and ²⁷Al SS-NMR. Varying degrees of electrostatic interaction existed between [BMIM]Br and the zeolite, as revealed by XPS, XRD, BET, and TGA. Over [BMIM]Br/NaY, the highest 5-HMF yield of 80, 62, and 59% and a furfural yield of 77% were obtained from fructose, glucose, and cellulose, and xylose, respectively. Stabilization of 5-HMF was apparent with all the [BMIM]Br functionalized zeolites, which prevented the side product formation. The 5-HMF yield was higher by a factor of 2 with the functionalized zeolites as compared to that with their bare zeolite counterparts. Moreover, [BMIM]Br/NaY showed good recycling stability.

中文翻译：

1-丁基-3-甲基咪唑鎓溴化物官能化沸石：相互作用性质和将碳水化合物转化为平台化学品的催化活性

在这项研究中，通过简便的瓶装船策略合成了1-丁基-3-甲基咪唑鎓溴化（[BMIM] Br）功能化的沸石。详细研究了[BMIM] Br与沸石之间的相互作用，以探索它们在催化碳水化合物转化为特定平台化学物质（5-羟甲基糠醛（5-HMF）和糠醛）的反应中的协同作用。使用各种技术对官能化沸石进行了全面表征，以确定[BMIM] Br的存在及其对沸石性能的影响。功能性沸石中的[BMIM] Br分解为两个阶段，与本体相比，具有更高的热稳定性。IL的分解温度随沸石骨架类型和阳离子而变化。²⁷ Al SS-NMR。XPS，XRD，BET和TGA表明，[BMIM] Br和沸石之间存在不同程度的静电相互作用。在[BMIM] Br / NaY上，分别从果糖，葡萄糖，纤维素和木糖获得了最高的5-HMF产率，分别为80％，62％和59％，糠醛产率为77％。所有[BMIM] Br官能化沸石均能稳定5-HMF，从而防止了副产物的形成。与相对的裸沸石相比，官能化沸石的5-HMF产率高出2倍。此外，[BMIM] Br / NaY显示出良好的循环稳定性。

更新日期：2020-08-25

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