The influence of Fe on the dispersion, electronic state, sulfur-resistance and catalysis of platinum supported on KL zeolite

Zheng, Jian; Schmauke, Thorsten; Roduner, Emil; Dong, Junwei; Xu, Qiao

doi:10.1016/s1381-1169(01)00096-6

Cited by 21 publications

(8 citation statements)

References 36 publications

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“…The close proximity between Pt and Fe promoted the reduction of FeO x species. 50,51 It is well established that the electron-rich state of Pt clusters is beneficial for the hydrogen desorption from the Pt atom surface, 25,52,53 which is consistent with the observation from the H 2 -TPD measurement (Figure 4C) that the shift of the hydrogen desorption peak to −40 °C of the PtFe-1/KL sample.…”

Section: ■ Results and Discussionsupporting

confidence: 85%

“…23,24 Fe species is a common promoter component acting as chemical anchors for Pt particles, which favors a high dispersion of Pt on the support. 25 Zhang and collaborators have reported that the isolated Pt single atoms could steadily disperse on the surfaces of FeO x , and then single-atom catalysts (SACs) attract considerable attention. 1,26 Recently, many works reported that a series of SACs can be synthesized by coprecipitation, incipient wetness impregnation, galvanic replacement reaction, and ALD on various substrate materials, including metals or metal oxide surfaces.…”

Section: ■ Introductionmentioning

confidence: 99%

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Highly Dispersed Single-Atom Pt and Pt Clusters in the Fe-Modified KL Zeolite with Enhanced Selectivity for n-Heptane Aromatization

Wang

et al. 2019

ACS Appl. Mater. Interfaces

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Conversion of straight-chain paraffins into aromatics is particularly attractive but extremely challenging in the oil refining industry. Constructing the Ptsupported catalysts with high aromatic selectivity is vital. Here, we report a strategy to use Fe-modified KL zeolites to improve the Pt atom utilization efficiency and anchor them inside KL zeolite channels via atomic-layer deposition technique. A combination of highly dispersed single-atom Pt and electron-rich Pt clusters is fabricated on the KL zeolite through the creation of proper nucleation sites. The resulted catalyst (PtFe-1/ KL) exhibits excellent performance for the n-heptane aromatization (90.1% aromatic selectivity) with an apparent activation energy of 131 kJ/mol and much enhanced stability at a relatively lower temperature (420 °C). Experimental analysis and density functional theory calculation demonstrate that the single-atom Pt might play a key role in the initial dehydrogenation of n-heptane to 1-heptene, and the superior stable Pt clusters encapsulated inside Fedecorated KL zeolite channels accelerate the 1-heptene dehydrocyclization to aromatics. The synergetic interaction between single-atom Pt and Pt clusters enables the PtFe-1/KL catalyst to be one of the most effective n-heptane aromatization catalysts reported to date.

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Section: ■ Results and Discussionsupporting

confidence: 85%

Section: ■ Introductionmentioning

confidence: 99%

Highly Dispersed Single-Atom Pt and Pt Clusters in the Fe-Modified KL Zeolite with Enhanced Selectivity for n-Heptane Aromatization

Wang

et al. 2019

ACS Appl. Mater. Interfaces

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“…According to Kobayashi et al, the Pt/Fe 2 O 3 –Al 2 O 3 catalyst with approximately 7 wt % Fe 2 O 3 in the support exhibited better performance in isobutane dehydrogenation than Pt/Al 2 O 3 . Zheng et al proposed that the bimetallic Pt–Fe/KL catalyst prepared by Fe and Pt coimpregnation exhibited better performance than Pt/KL in n -hexane aromatization. They proposed that the addition of Fe 2 O 3 increased the surface Pt atoms’ electron density through the formation of Pt–Fe bimetallic particles.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Dehydrogenative Aromatization of Propane by Incorporating Fe and Pt into the Zn/HZSM-5 Catalyst

Zhou

Liu

Lin

et al. 2018

Ind. Eng. Chem. Res.

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In this study, an attempt was made to modify the Zn/HZSM-5 aromatization catalyst by successively impregnating Fe and Pt. Multitechniques including NH3 adsorption FT-IR, TEM, HAADF-STEM, XPS, and operando dual beam FT-IR spectroscopy of propane aromatization were employed to investigate the interactions among Zn, Fe, and Pt and the synergetic catalysis among the Brønsted acid sites, Lewis acid sites, and metallic sites of the ZnFePt/HZSM-5 catalyst. Results show that an optimized trimetallic Zn1.0Fe0.3Pt0.1/HZSM-5 catalyst has much lower dry gas production and significantly enhanced propane transformation activity and aromatization selectivity compared with the parent Zn/HZSM-5. The excellent performance of the trimetallic catalyst could be attributed to the high dispersion of metals, the formation of FePt bimetallic dehydrogenation active sites, and the promotion effect of FePt sites for the recombinational desorption of H atoms for the [ZnOZn]2+ sites. The fixed-bed reaction indicates that the trimetallic Zn1.0Fe0.3Pt0.1/HZSM-5 catalyst also has excellent durability which is desirable for practical use.

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“…The addition of a transition metal to a noble metal catalyst leads to materials with completely different physicochemical and electronic properties and therefore catalytic performance and stability. The formation of heteroatom bonds changes the electronic environment of the metal surface, giving rise to modifications of its electronic structure through the ligand effect . The interaction between the two metals, which depends on the preparation method, experimental conditions (reduction/oxidation) and catalyst composition, affects the chemical surface properties of the catalyst (size, structure and morphology of the formed nanoparticles) …”

Section: Introductionmentioning

confidence: 99%

Hydrodeoxygenation of glycerol with in situH₂ formation over Pt catalysts supported on Fe modified Al₂O₃: effect of Fe loading

Yfanti

Vasiliadou

Sklari

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND: Glycerol hydrodeoxygenation to 1,2-propanediol is a reaction of commercial and environmental significance. However, the need for hydrogen supply is a main drawback of the process. This study aims at the development of effective catalysts for glycerol hydrodeoxygenation with in situ H 2 formed. Pt/Al 2 O 3 and Pt/Fe 2 O 3 -Al 2 O 3 catalysts with different Fe/Pt ratios were synthesized and evaluated. N 2 physisorption, XRD, TPR-H 2 , TGA and DRIFTS-CO characterization techniques were used. Main focus was given on catalyst reusability, while a parametric study was also performed. RESULTS: Fe addition promotes catalysts activity. Characterization showed that there is an electron interaction between Pt andFe which is responsible for this enhancement. However, Fe/Pt ratio and reduction temperature affect catalyst performance. The increase of Fe loading leads to lower H 2 formation rates but also to more stable catalyst performance. The most promising results were achieved over the Fe richer catalyst which exhibited 51.5% 1,2-propanediol selectivity, 93.8% glycerol conversion, under 3.5 MPa N 2 , at 250 ∘ C, 1 h and pre-reduction at 200 ∘ C. CONCLUSION:The presence of Fe in Pt/Al 2 O 3 catalysts was proved decisive for the combined cycle of glycerol hydrodeoxygenation-aqueous phase reforming. The high activity and the stable performance in aqueous medium may render these materials as suitable catalysts for various liquid phase hydrodeoxygenation reactions.

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The influence of Fe on the dispersion, electronic state, sulfur-resistance and catalysis of platinum supported on KL zeolite

Cited by 21 publications

References 36 publications

Highly Dispersed Single-Atom Pt and Pt Clusters in the Fe-Modified KL Zeolite with Enhanced Selectivity for n-Heptane Aromatization

Highly Dispersed Single-Atom Pt and Pt Clusters in the Fe-Modified KL Zeolite with Enhanced Selectivity for n-Heptane Aromatization

Enhanced Dehydrogenative Aromatization of Propane by Incorporating Fe and Pt into the Zn/HZSM-5 Catalyst

Hydrodeoxygenation of glycerol with in situH₂ formation over Pt catalysts supported on Fe modified Al₂O₃: effect of Fe loading

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The influence of Fe on the dispersion, electronic state, sulfur-resistance and catalysis of platinum supported on KL zeolite

Cited by 21 publications

References 36 publications

Highly Dispersed Single-Atom Pt and Pt Clusters in the Fe-Modified KL Zeolite with Enhanced Selectivity for n-Heptane Aromatization

Highly Dispersed Single-Atom Pt and Pt Clusters in the Fe-Modified KL Zeolite with Enhanced Selectivity for n-Heptane Aromatization

Enhanced Dehydrogenative Aromatization of Propane by Incorporating Fe and Pt into the Zn/HZSM-5 Catalyst

Hydrodeoxygenation of glycerol with in situH2 formation over Pt catalysts supported on Fe modified Al2O3: effect of Fe loading

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Product

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Hydrodeoxygenation of glycerol with in situH₂ formation over Pt catalysts supported on Fe modified Al₂O₃: effect of Fe loading