Resolving Complex K–Pt–Sn Interactions in PtSn@K-MFI Catalysts for Alkane Dehydrogenation DOI Creative Commons

Adrián Martínez Gómez-Aldaraví,

Reisel Millán,

Isabel Millet

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

K and Sn contents were rationalized during the synthesis of PtSn@K-MFI to maximize metal dispersion stability along MFI crystallites. Experimental results theoretical calculations reveal a stoichiometry ∼1 per unit cell MFI, limiting then final incorporation within siliceous crystals at ∼0.7 wt %. Above this stoichiometry, is not incorporated into solids unless significant amounts are simultaneously present, leading formation tin-silicate precipitates. The optimized catalysts improve catalytic performance well-established references, as PtSn/SiO2, for propane dehydration (PDH) reaction. In particular, low loadings (below 0.5 %) result in higher time-on-stream (TOS) deactivation profiles but excellent regenarability after consecutive PDH reaction, while content (close 1 minimizes TOS due maximization Pt-Sn bonds regenerations sintering. Increasing crystallites facilitates Pt sintering and, thus, occurring catalyst upon regeneration cycles. As complex interconnected nucleation/crystallization processes, fine-tuning rationalizations one-pot approaches can substantially influence atomic subnanometric interactions consequently, sintering-resistance properties when exposed highly demanding industrial conditions.

Language: Английский

Tuning the regioselectivity of heterogeneous hydroformylation by engineering carbon species microenvironment around Rh sites DOI
Li Huang, Jia Wang, Qi Liu

et al.

Journal of Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 116095 - 116095

Published: March 1, 2025

Language: Английский

Citations

0
Effect of Metal Dispersion in Rh-Based Zeolite and SiO2 Catalysts on the Hydroformylation of Olefin Mixtures from Fischer–Tropsch Synthesis DOI Open Access
Yu Wang, Xuemin Cao, Yuting Dai

et al.

Catalysts, Journal Year: 2025, Volume and Issue: 15(3), P. 212 - 212

Published: Feb. 24, 2025

This study investigates the hydroformylation of C5+ olefins derived from Fischer–Tropsch synthesis (FTS) using Rh-based catalysts supported on zeolites (MFI, MEL) and SiO2. A series were synthesized through two different methods: a one-pot hydrothermal crystallization process, which results in highly dispersed Rh species encapsulated within zeolite framework (Rh@MFI, Rh@MEL), an impregnation method that produces larger nanoparticles exposed support surface (Rh/MFI, Rh/MEL, Rh/SiO2). Characterization techniques such as BET, TEM, FTIR employed to evaluate catalysts, revealing significant differences dispersion accessibility species. Owing its more accessible mesoporous structure, Rh/SiO2 with pore size 5.6 nm exhibited highest olefin conversion rate (>90%) 40% selectivity C6+ aldehydes. In contrast, zeolite-encapsulated higher for aldehydes (~50%) due better confinement linear aldehyde formation. also examined influence FTS byproducts, including paraffins short-chain olefins, reaction. Results showed long-chain had negligible effect conversion, while presence propene, reduced both competitive adsorption. work highlights critical role catalyst design, diffusion, feedstock composition optimizing performance, offering insights improving efficiency syngas-to-olefins processes.

Language: Английский

Citations

0
Resolving Complex K–Pt–Sn Interactions in PtSn@K-MFI Catalysts for Alkane Dehydrogenation DOI Creative Commons

Adrián Martínez Gómez-Aldaraví,

Reisel Millán,

Isabel Millet

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

K and Sn contents were rationalized during the synthesis of PtSn@K-MFI to maximize metal dispersion stability along MFI crystallites. Experimental results theoretical calculations reveal a stoichiometry ∼1 per unit cell MFI, limiting then final incorporation within siliceous crystals at ∼0.7 wt %. Above this stoichiometry, is not incorporated into solids unless significant amounts are simultaneously present, leading formation tin-silicate precipitates. The optimized catalysts improve catalytic performance well-established references, as PtSn/SiO2, for propane dehydration (PDH) reaction. In particular, low loadings (below 0.5 %) result in higher time-on-stream (TOS) deactivation profiles but excellent regenarability after consecutive PDH reaction, while content (close 1 minimizes TOS due maximization Pt-Sn bonds regenerations sintering. Increasing crystallites facilitates Pt sintering and, thus, occurring catalyst upon regeneration cycles. As complex interconnected nucleation/crystallization processes, fine-tuning rationalizations one-pot approaches can substantially influence atomic subnanometric interactions consequently, sintering-resistance properties when exposed highly demanding industrial conditions.

Language: Английский

Citations

0