The intrinsic effect of co-feeding water on the formation of active/deactivating species in the methanol-to-hydrocarbons reaction on ZSM-5 zeolite
KAUST DepartmentPhysical Science and Engineering (PSE) Division
Embargo End Date2022-01-28
Permanent link to this recordhttp://hdl.handle.net/10754/668282
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AbstractWater is formed and added in the conversion of methanol-to-hydrocarbons, slowing down both the reaction and deactivation rates. This work aims to clarify the selective nature of water quenching on a ZSM-5 zeolite catalyst in terms of (1) reaction/deactivation using an integral reactor (full range of conversions) and (2) rate of formation/growth of deactivating species using two FTIR and UV-visin situdifferential reactors (conversions lower than 0.15). Our approach assesses the effect of water under comparable conversion conditions while characterizing in detail the products and intermediates of the reaction (by online andin situanalysis, and extraction measurements). The results obtained prove, in an unbiased way, that water quenches more selectively the deactivation than the reaction with moderate amounts of added water (water/methanol = 0.11 g g−1). On the other hand,in situFTIR spectroscopy evidences that co-feeding water sweeps the retained species from the silanol sites and favors the formation of olefins as retained species, whilein situUV-vis spectroscopy proves that the rate of formation/growth of discrete retained species drop by the addition of water and the degree of this decline is severer for coke than for coke precursors or active species.
CitationValecillos, J., Elordi, G., Aguayo, A. T., & Castaño, P. (2021). The intrinsic effect of co-feeding water on the formation of active/deactivating species in the methanol-to-hydrocarbons reaction on ZSM-5 zeolite. Catalysis Science & Technology, 11(4), 1269–1281. doi:10.1039/d0cy02497j
SponsorsThis work was possible thanks to the financial support of the Ministry of Economy, Industry and Competitiveness of the Spanish Government (Project CTQ2016-79646-P, co-founded with ERDF funds) and the Basque Government (Project IT748-13, IT912-16). J. V. is thankful for his fellowship granted by the Ministry of Economy, Industry and Competitiveness of the Spanish Government (BES-2014-069980). The authors are thankful for technical and human support provided by IZO-SGI SGIker of UPV/EHU and European funding (ERDF and ESF).
PublisherRoyal Society of Chemistry (RSC)
JournalCatalysis Science and Technology