Insight into the support effect on the particle size effect of Pt/C catalysts in dehydrogenation

Tuo, Yongxiao; Shi, Liujie; Cheng, Hongye; Zhu, Yi‐An; Yang, Minglei; Xu, Jing; Han, Yi‐Fan; Li, Ping; Wang, Yuan

doi:10.1016/j.jcat.2018.02.001

Cited by 86 publications

(37 citation statements)

References 74 publications

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“…Recently, to clarify each effect on the activity of carbon-supported Pt catalysts during the dehydrogenation of decalin to release hydrogen, a series of Pt/C catalysts have been elaborately prepared from CNF and CNT, with various NP sizes (from 1 to 9 nm). 371 Great differences between Pt/CNF and Pt/CNT in both the geometric structure and electronic property of Pt clusters have been revealed, especially when the NP size is smaller than 2 nm. Pt atoms interact more strongly with the edge planes of CNF than with the basal planes of CNT, hence forming a more dispersive and simultaneously more active Pt-C boundary for further reaction of interest.…”

Section: Platinummentioning

confidence: 99%

“…Large difference in activity were also reported for decalin dehydrogenation over Pt/CNT and Pt/CNF catalysts due to charge transfer. 371 For small NP (< 2nm), the larger charge transfer from Pt to CNF compared to CNT is the most significant factor for activating the reactant while avoiding the strong adsorption of the product because of the low d-band center of Pt NP. When Pt NP are larger than 2 nm, the particle size effect becomes preponderant.…”

Section: Ag8/n-gmentioning

confidence: 99%

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A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

2019

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Fermi level in vii) are shown in purple in ii)-vi) with an iso-value of ±0.003 a.u. Reprinted with permission from ref 57 . Copyright 2014 from the Royal Society of Chemistry; b) Molecular model of a corannulene-like element functionalized with three carboxylic groups from two different perspectives in the cpk representation (on the left). The final structure (190 elements in a cubic cell of 60 Å in size) obtained from random packing of the individual elements (on the right). Cyan: carbon, red: oxygen, white: hydrogen. Reprinted with permission from ref 59 Copyright 2017 from Elsevier; c) Side-views of Ru13 adsorbed on Gr-DV-2COOH site before (on left panel) and after a proton jump (right panel). C atoms are in black, O in red, H in with white and Ru in mocha. Reprinted with permission from ref 60 Copyright 2014 from Elsevier; and d) Spin-density projection in µB/a.u. 2 on the graphene plane around i) the hydrogen chemisorption defect (∆) and ii) the vacancy defect in the a sublattice. Carbon atoms corresponding to the a sublattice (o) and to the b sublattice (•) are distinguished. Simulated STM images of the defects are shown in iii) and iv), respectively. Reprinted with permission from ref 61 .

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Section: Platinummentioning

confidence: 99%

Section: Ag8/n-gmentioning

confidence: 99%

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

2019

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“…The upward shi of the Pt 4f peaks was due to strong interactions between Cu and Pt, which would reduce the adsorption energies of reactive intermediates on the catalyst surface, thus improving the HER performance of PtCu/CB. [42][43][44] In the Cu spectra, the peak intensities of metallic Cu are obviously larger than those of Cu(II), revealing the metallic chemical state of Cu in the samples (Table S4 †). 45 Based on TEM images (Fig.…”

Section: Resultsmentioning

confidence: 99%

The facile synthesis of core–shell PtCu nanoparticles with superior electrocatalytic activity and stability in the hydrogen evolution reaction

et al. 2021

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“…Despite the great potential of Pt catalysts, they suffer from deactivation [4] due to coke deposition [5]. Several reports in the technical literature shed some light in the current understanding of ways of dealing with catalyst deactivation, for example, by adding a second metal to the Pt catalyst [6], using other supports rather than the typically employed Al 2 O 3 [7], modifying the Pt particle size [8], and others [9,10]. The incorporation of a highly connected support is a less commonly implemented methodology to address coke deposits and the subsequent catalyst deactivation [11,12].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Study of Coke Deposits on a Pt-Sn/SBA-16 Catalyst during the Dehydrogenation of Propane

et al. 2021

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Catalytic propane dehydrogenation is an attractive method to produce propylene while avoiding the issues of its traditional synthesis via naphtha steam cracking of naphtha. In this contribution, a series of Pt-Sn/SBA-16 catalysts were synthesized and evaluated for this purpose. Bimetallic Pt-Sn catalysts were more active than catalysts containing only Pt. The catalyst with the best performance was assessed at different reaction times of 0, 60, 180, and 300 min. The evolution of coke deposits was also studied. Thermogravimetric analysis demonstrated the presence of two types of coke on the catalyst surface at low and high temperature, respectively. Raman results showed an increased coke’s crystal size from 60 to 180 min on stream, and from 180 to 300 min under reaction, Raman suggested a reduction in the crystal size of coke. Also transmission electron microscopy confirmed a more evident agglomeration of metallic particles with reaction times higher than 180 min. These results are consistent with the phenomena called “coke migration” and the cause is often explained by coke movement near the particle to the support; it can also be explained due to sintering of the metallic particle, which we propose as a more suitable explanation.

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Insight into the support effect on the particle size effect of Pt/C catalysts in dehydrogenation

Cited by 86 publications

References 74 publications

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

The facile synthesis of core–shell PtCu nanoparticles with superior electrocatalytic activity and stability in the hydrogen evolution reaction

A Comprehensive Study of Coke Deposits on a Pt-Sn/SBA-16 Catalyst during the Dehydrogenation of Propane

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