Sub-nanometer Pt2In3 intermetallics as ultra-stable catalyst for propane dehydrogenation

Xing, Yuxuan; Bi, Guiyue; Pan, Xiaoli; Jiang, Qike; Tan, Yuanlong; Su, Yang; Kang, Leilei; Li, Bonan; Li, Lin; Wang, Aiqin; Ma, Jingyuan; Yang, Xiaofeng; Liu, Xiao Yan; Zhang, Tao

doi:10.1016/j.jechem.2023.04.019

Cited by 9 publications

(11 citation statements)

References 51 publications

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“…37,39,63 Interestingly, contrary to the change of the binding energy of Pt 4f, the binding energy of In 0 species of the spent 0.5Pt0.3In(0.3Ce)/SiO 2 downshifted by 0.4 eV, which proved that the introduction of 0.3Ce promoted the formation of the strong electron synergy between Pt and In. That is, the electrons on Pt species transfer to In and generate the PtIn alloy, 37 following the XRD and TEM results. However, in the In 3d spectra, there is no noticeable In 0 signal for the spent 0.5Pt0.3In(2.0Ce)/SiO 2 catalyst, which demonstrates that the introduction of an appropriate amount of Ce inhibits the appearance of In 0 via modulating the reducibility of oxidized In 3+ species.…”

Section: Analysis Of the Robustness Of The Ptin(ce)mentioning

confidence: 93%

“…The Pt binding energy of the fresh 0.5Pt0.3In/SiO 2 is 71.7 eV higher than 71.6 eV that of the spent 0.5Pt0.3In/SiO 2 catalyst, such a minor shift may be caused by errors or the formation of the PtIn alloy. 37 Notably, in the Pt 4f spectrum, the positive shift of 0.3 eV for the spent 0.5Pt0.3In(0.3Ce)/SiO 2 and 0.5Pt0.3In(2.0Ce)/SiO 2 catalysts indicates the Ce addition modifies the electronic structure of Pt δ+ active sites. 61,62 Similarly, the In 3d spectrum is deconvoluted into two pairs of Gaussian−Lorentzian peaks, of which the bands at 444.2− 444.6 eV are ascribed to In 0 species and the other band located at 445.9 eV assigned to In 3+ species of spin−orbit doubles.…”

Section: Analysis Of the Robustness Of The Ptin(ce)mentioning

confidence: 94%

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Enhanced PtIn Catalyst via Ce-Assisted Confinement Effect in Propane Dehydrogenation

Wang,

Liao,

Chen

et al. 2024

ACS Catal.

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The PtIn nanoalloys with high surface energy are generally in a metastable state during harsh reaction conditions, and the ordered alloy structure is not conducive to exposure of surface Pt active sites. Herein, a strategy for restructuring the unfavorable PtIn alloy structure via heteroatom (Ce) doping is applied to advance an isolated Ptδ+ confined by the InCeO x nanoislands supported on SiO2. The as-synthesized catalyst with optimizing PtIn(Ce) ternary components exhibits ∼92.2% selectivity toward propylene and a stable propane conversion of ∼67.1% at 550 °C (k d of 0.010 h–1). As demonstrated by the comprehensive characterizations, the introduced proper amount of Ce species leads to the reorganization of the disadvantaged PtIn nanoalloy structure into the robustness of the isolated Ptδ+ site confined by the InCeO x nanoislands via inhibiting the In0 species generation. The introduced Ce species modulate the electronic interaction between Pt, In, and carrier, stimulating the capability to activate reactive molecules and at the same time acting as spatial physical barriers to restrict the migration of the isolated Ptδ+ species. This work proposed a facile and efficient strategy to promote the capability against sintering and coking of the Pt-based catalyst in propane dehydrogenation.

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Section: Analysis Of the Robustness Of The Ptin(ce)mentioning

confidence: 93%

Section: Analysis Of the Robustness Of The Ptin(ce)mentioning

confidence: 94%

Enhanced PtIn Catalyst via Ce-Assisted Confinement Effect in Propane Dehydrogenation

Wang,

Liao,

Chen

et al. 2024

ACS Catal.

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“…The first-order deactivation model was adopted to calculate the catalyst deactivation constant k d (h –1 ). , The calculation method is shown in eq . k d .25em ( normalh − 1 ) = ln ( 1 − X f X f ) − ln ( 1 − X i X i ) t where X f and X i represented the C 3 H 8 molar conversion at 405 and 5 min, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The first-order deactivation model was adopted to calculate the catalyst deactivation constant k d (h −1 ). 41,42 The calculation method is shown in eq 5.…”

Section: Catalytic Performance Testmentioning

confidence: 99%

Copper-Promoted Platinum Supported on HSSZ-13 Zeolite Catalysts for Propane Dehydrogenation to Propylene

Fu,

Ma,

Qian

et al. 2024

Energy Fuels

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Pt/HSSZ-13 with 0.5−3 wt % Pt load and PtCu/ HSSZ-13 with 1−7 wt % Cu load were prepared by the initial wetness impregnation method. Without compromising the original crystal structure and surface texture characteristics, doped Pt and Cu are dispersed uniformly throughout the surface. The Si/Al molar ratio affected not only the texture of the crystal but also the number of acid sites on the catalyst surface. The appropriate addition of Cu significantly increased the dispersion of Pt. The addition of Cu also provided electrons to Pt, affected the electron cloud density on the surface of Pt, and then reduced the adsorption of propylene and improved the selectivity of propylene. Cu can also decrease the number of acidic sites on the catalyst surface, thus slowing the deactivation rate of the catalyst and the amount of carbon deposition during the reaction. 1.0Pt3.0Cu/HSSZ-13(40) had a small number of strong acid sites (3.89 μmol/g) and showed the best propane initial conversion (73.95%), excellent propylene selectivity (97.60%), lowest deactivation constant (0.33 h −1 ), and good regeneration robustness.

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“…Propylene, a significant chemical feedstock, has encountered mounting conflict between supply and demand in recent years. 1 The propane dehydrogenation (PDH) process, which can directly yield propylene, has attracted great attention due to its economic viability 2,3 and continues to increase in the share of global propylene production. 4,5 Pt-based catalysts are widely utilized in the chemical industry for PDH.…”

Section: Introductionmentioning

confidence: 99%

Alkaline-earth ion stabilized sub-nano-platinum tin clusters for propane dehydrogenation

Lu,

Luo,

Chen

et al. 2024

Chem. Sci.

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Sub-nanometer Pt2In3 intermetallics as ultra-stable catalyst for propane dehydrogenation

Cited by 9 publications

References 51 publications

Enhanced PtIn Catalyst via Ce-Assisted Confinement Effect in Propane Dehydrogenation

Enhanced PtIn Catalyst via Ce-Assisted Confinement Effect in Propane Dehydrogenation

Copper-Promoted Platinum Supported on HSSZ-13 Zeolite Catalysts for Propane Dehydrogenation to Propylene

Alkaline-earth ion stabilized sub-nano-platinum tin clusters for propane dehydrogenation

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