10.1021/ja4060178
The research investigates the room temperature dehydrogenation of ethane, propane, linear alkanes C4?C8, and some cyclic alkanes by a transient titanium neopentylidyne complex, [(PNP)Ti?CtBu] (A). The purpose is to explore an efficient and mild method for converting natural gas components into more useful commodity reagents, addressing the global energy crisis and the need for sustainable chemical transformations. The study demonstrates that complex A can dehydrogenate these alkanes to form olefin complexes, such as [(PNP)Ti(η2-H2C-CHR)(CH2 tBu)] (R = H, CH3, CH2CH3, nPr, nBu), through a mechanism involving sequential 1,2-CH bond addition and β-hydrogen abstraction. Computational studies reveal that the formation of terminal olefins is both kinetically and thermodynamically favorable. The olefin complexes can be liberated using oxidants like N2O and organic azides. The research concludes that this titanium-based system offers a promising pathway for alkane dehydrogenation under mild conditions, potentially leading to more sustainable and energy-efficient processes for converting natural gas into valuable chemicals.
10.1016/j.apcata.2010.04.041
The research investigates the effects of substituting Fe, Ga, Ti, and Nb in ?SbVO4 catalysts on propane ammoxidation for acrylonitrile production. The study found that Fe, Ga, and Ti substitutions resulted in lower catalyst activity but significantly higher selectivity to acrylonitrile compared to pure ?SbVO4, while Nb substitution did not enhance catalytic properties. Characterizations using XRD, DRIFT, and Raman spectroscopy revealed the formation of a cation-deficient single rutile-type phase. The results support the site isolation theory, indicating that isolating propane-activating V–O sites in a nitrogen-inserting Sb-site environment improves selectivity for acrylonitrile formation.
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