Synergistic mechanism of isolated Fe<sup>3+</sup> and highly dispersed Pt<sup>δ+</sup> over zeolite for boosting propane dehydrogenation

Zhang, Ying; Wang, Xiaofang; Deng, Huihui; Sun, Qin; Li, Baozhen; Zheng, Wenchun; Ren, Zhuangzhuang; Fang, Xiangqing; Tan, Li; Tang, Yu; Wu, Lizhi

doi:10.1002/aic.18249

Cited by 5 publications

(4 citation statements)

References 63 publications

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“…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. 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.…”

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

confidence: 99%

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: 99%

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

Wang,

Liao,

Chen

et al. 2024

ACS Catal.

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“…In addition to Sn promoters, many metals can be used as promoters for Pt-based catalysts, such as Zn, 15,16 Mn, 17,18 Ga, 19,20 In, 21,22 and Fe. 23,24 In addition to these metals, Cu is also a promoter of Ptbased catalysts. Han et al prepared a Pt−Cu bimetallic catalyst supported on Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

“…The addition of Sn increased the dispersion of Pt, improved the electronic state of Pt, improved the conversion of propane, and reduced the catalyst’s rate of deactivation. In addition to Sn promoters, many metals can be used as promoters for Pt-based catalysts, such as Zn, , Mn, , Ga, , In, , and Fe. , …”

Section: Introductionmentioning

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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“…Different from the Pt-based catalysts, [10][11][12][13] adding a second metal may result in the deactivation of Co-based catalysts. 14 Hence, it is less studied via introducing a second metal to improve Co species dispersion to achieve high catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Obtaining highly stable T_d‐Co(II) site by coupling hydrothermal method and CO₂ introduction for propane dehydrogenation

Deng,

Sun,

Zheng

et al. 2024

AIChE Journal

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The preparation of Co‐based catalysts with a single, highly dispersed active site is challenging and crucial for the high‐performance propane dehydrogenation (PDH) owing to harsh reaction conditions. Herein, the synergetic strategies including catalyst hydrothermal treatment and CO2 introduction are adopted to realize the highly dispersed and stable Td‐Co(II) site and applied for PDH. According to systematic characterizations and catalytic performance evaluation, the facial hydrothermal treatment improves the C3H6 formation rate from 456 to 771 mmol C3H6 gCo−1 h−1 and catalyst stability via the transformation of Co3O4 species to the Td‐Co(II) species. Meanwhile, the further introduction of CO2 into the PDH system as a protective reagent for Co state would facilitate PDH with superior catalytic performance with TOF of 700 h−1 and C3H6 formation rate of 970 mmol C3H6 gCo−1 h−1. It is revealed that the introduction of CO2 maintains Co state with the Td‐Co(II) species via inhabiting the generation of metallic Co spices.

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Synergistic mechanism of isolated Fe³⁺ and highly dispersed Pt^δ+ over zeolite for boosting propane dehydrogenation

Cited by 5 publications

References 63 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

Obtaining highly stable T_d‐Co(II) site by coupling hydrothermal method and CO₂ introduction for propane dehydrogenation

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Synergistic mechanism of isolated Fe3+ and highly dispersed Ptδ+ over zeolite for boosting propane dehydrogenation

Cited by 5 publications

References 63 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

Obtaining highly stable Td‐Co(II) site by coupling hydrothermal method and CO2 introduction for propane dehydrogenation

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Synergistic mechanism of isolated Fe³⁺ and highly dispersed Pt^δ+ over zeolite for boosting propane dehydrogenation

Obtaining highly stable T_d‐Co(II) site by coupling hydrothermal method and CO₂ introduction for propane dehydrogenation