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Pure silica zeolite with MEL structure (Si-ZSM-11) was firstly reported as an efficient Methanol-to-Propene (MTP) catalyst in methanol conversion, with higher propene yield (14.0 wt.%) and propene/ethene ratio (5.9) than H-ZSM-11 zeolite with a Si/Al ratio of 26 (7.4 wt.% and 1.9, respectively). Hydrogen-bonded silanol groups in Si-ZSM-11 are weakly acidic and act as active sites in methanol conversion, predominantly promoting propene production and inhibiting side reactions.

The effect of sulfate species in propane dehydrogenation over Co/Al2O3 catalysts was studied. On the one hand, the interaction between SO42− and cobalt species leads to better dispersed cobalt oxide and restrains the reduction to metallic Co species, thereby inhibiting cracking reaction. On the other hand, the initial C–H bond activation and scission are facilitated on the electron-deficient cobalt and sulfate sites, resulting in dramatically improved dehydrogenation performance. XPS, MS and XRD results show that the reduction of sulfate species to SO2 and consequently the loss of active cobalt species contribute to the irreversible deactivation of catalyst.