Flow MAS NMR for In Situ Monitoring of Carbon Dioxide Capture and Hydrogenation Using Nanoporous Solids

摘要

The capability of H-1 and C-13 flow magic-angle spinning NMR is demonstrated for monitoring the capture of CO2 on the surface of mesoporous amine-functionalized silica and the progress of heterogeneously catalyzed CO2 hydrogenation over the microporous titanosilicate Pt/ETS-10 under in situ conditions. The custom-built gas-handling system allows to maintain a controllable and stable delivery of reaction gases to the sample compartment containing porous material over a period of hours. Using calibration of NMR signals, we obtained the amounts of reactants and products. The presented approach demonstrates a complementary NMR-based in situ method for quantitative investigation of CO2 capture and conversion over nanoporous solids.