采用同步加速器SVUV-PIMS技术捕获草酸二甲酯加氢过程中的(CHO)Cu1*物质
DOI:
https://doi.org/10.18686/cncest.v2i3.228关键词:
SVUV-PIMS；草酸二甲酯加氢；铜纳米粒子；脱铝β沸石；中间体；催化剂稳定性摘要
采用同步辐射真空紫外光电离质谱（synchrotron vacuum ultraviolet photoionization mass spectrometry，SVUV-PIMS）捕捉中间产物极大地促进了对催化反应的理解。这篇评论介绍了SVUV-PIMS的结构，然后重温了一项出色的科学工作，该工作利用SVUV-PIMS阐明了草酸二甲酯（mechanisms of dimethyl oxalate，DMO）在铜纳米颗粒（copper nanoparticles，Cu NPs）支撑的脱铝β沸石（dealuminated Beta zeolite，Beta-deAl）上加氢转化为乙二醇的机理。采用SVUV-PIMS观察关键中间产物，特别是(CHO)Cu1*物质，可实时、原位地了解Cu NPs在DMO加氢过程中的动态行为。研究结果表明，甲醇处理后形成了硅醇巢，并出现了金属铜和Cu2O相。这种处理有助于保持较小的纳米颗粒尺寸，从而获得较高的乙二醇产率和较长的催化剂稳定性。此外，他们的催化剂还解决了二氧化硅浸出等常见问题，这些问题往往会影响基于CuSiO2基催化剂的耐久性。通过重新审视他们的工作，这篇评论强调了SVUV-PIMS在催化研究中的变革潜力，对反应中间产物的操作适应性对于开发更高效、更耐用的催化剂非常宝贵。
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