Abstract
Abstract: Synchrotron infrared micro-spectroscopy has been applied to measure in situ the reaction of dimethylether in single crystals of the silicoaluminophosphate STA-7. The crystals are found to contain a uniform and homogeneous distribution of acidic hydroxyl groups. Dimethylether is hydrogen bonded to the hydroxyl groups at low temperatures, but evidence is found for dissociation to form surface methoxy groups above 473 K, and aromatic hydrocarbon pool species above 573 K. From time resolved infrared measurements coupled with MS analysis of evolved products it is concluded that alkene formation occurs via a direct mechanism from reaction of dimethylether with surface methoxy groups. Graphical Abstract: [Figure not available: see fulltext.]
Original language | English |
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Pages (from-to) | 1-14 |
Number of pages | 14 |
Journal | Topics in Catalysis |
Volume | 61 |
Issue number | 3-4 |
Early online date | 16 Jan 2018 |
DOIs | |
Publication status | Published - Apr 2018 |
Bibliographical note
Open access via the Springer Compact Agreement.We thank the Diamond Light Source for provision of beam time and support facilities at the MIRIAM beamline B22 (Experiments SM11766-1 and SM13725-1). Financial support from the EPSRC Catalysis Hub (Suwardiyanto) and an Industrial CASE Award (EPSRC/BP Chemicals) (Price) are also acknowledged.
Keywords
- Dimethylether
- Hydrocarbon pool
- Infrared microspectroscopy
- STA-7