Department of Physics, Montana State University, Bozeman, MT 59717, USA.
Department of Chemical and Biological Engineering, Montana State University, Bozeman, MT 59717, USA.
Molecules. 2021 Sep 11;26(18):5518. doi: 10.3390/molecules26185518.
Zeolites are known to be effective catalysts in biomass converting processes. Understanding the mesoporous structure and dynamics within it during such reactions is important in effectively utilizing them. Nuclear magnetic resonance (NMR) relaxation and diffusion measurements, using a high-power radio frequency probe, are shown to characterize the dynamics of water in mesoporous commercially made 5A zeolite beads before and after the introduction of xylose. Xylose is the starting point in the dehydration into furfural. The results indicate xylose slightly enhances rotational mobility while it decreases translational motion through altering the permeability, , throughout the porous structure. The measurements show xylose inhibits pure water from relocating into larger pores within the zeolite beads where it eventually is expelled from the bead itself.
沸石在生物质转化过程中被证明是有效的催化剂。在这些反应中，了解其中的介孔结构和动力学对于有效地利用它们非常重要。使用高功率射频探头的核磁共振（NMR）弛豫和扩散测量被证明可以在引入木糖前后表征介孔商业 5A 沸石珠中的水的动力学。木糖是脱水生成糠醛的起点。结果表明，木糖通过改变渗透性略微增强了旋转流动性，同时通过改变渗透性降低了平移运动，在整个多孔结构中。测量结果表明，木糖抑制了纯水从沸石珠中较大的孔重新定位到沸石珠本身中，最终从沸石珠中排出。
