Effect of group IB metals on the dehydrogenation of propane to propylene over anti-sintering Pt/MgAl2O4

Ren, Guoqing; Pei, Guangxian; Ren, Yujing; Liu, Kaipeng; Chen, Zhiqiang; Yang, Jingguo; Su, Yang; Liu, Xiaoyan; Li, Weizhen; Zhang, Tao

doi:10.1016/j.jcat.2018.08.001

Cited by 78 publications

(35 citation statements)

References 53 publications

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“…In fact, Sn is the conventional component used for Pt catalysts in propane dehydrogenation. [ 28 ] The effect of Sn is sometimes attributed to increase of stability. One of Pt in cluster is replaced by Sn.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Property and Stability of Subnanometer Pt Cluster on Carbon Nanotube in Direct Propane Dehydrogenation

et al. 2021

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Main observation and conclusion The stability of nanosized platinum catalyst in direct propane dehydrogenation reaction is one of most critical challenges, which hinders the further improvements of catalytic performance. The cokes from side reaction covering the active site seriously undermine the catalyst stability. In this work, first principles calculations are performed to explore the catalytic properties of supported subnanometer platinum cluster on carbon nanotube support and focus is put on the inhibition of deep dehydrogenation. The reactivities of metal, interface, and tin promoter are investigated at the same footing. The whole reaction pathway from propane adsorption to propene desorption is revealed for different sites. It turns out that the C—H bond activation in propane is not the catalytic step with the largest barrier. Instead, the desorption of propene is more difficult. The comparison between different sites indicates that the interface between metal and support and Sn promoter is helpful to curb the propene deep dehydrogenation. Moreover, a descriptor is proposed to screen the potential effective propane direct dehydrogenation catalyst. The current work provides important insights on the development of new dehydrogenation catalyst.

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Section: Resultsmentioning

confidence: 99%

Catalytic Property and Stability of Subnanometer Pt Cluster on Carbon Nanotube in Direct Propane Dehydrogenation

et al. 2021

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“…As reported previously [35], the variation in electron density of transition metal imposes influences on the back-donation of d-electrons to the 2p* antibonding orbital of CO, which would result in the change of C-O bond strength and the shift of stretching frequency. In this work, the splitting of CO linear adsorption band can be explained as the coexistence of electron-rich Pt 0 and electron-deficient Pt d+ species [36,37]. The IR band is therefore deconvoluted into two peaks via a Gaussian peak fitting method [38], so as to estimate the relative content of Pt d+ on the sample surface (Fig.…”

Section: The Electronic Structure Of Re-mg X Al 1 -Ldh-ptmentioning

confidence: 99%

Glycerol aerobic oxidation to glyceric acid over Pt/hydrotalcite catalysts at room temperature

Zhang

et al. 2019

Science Bulletin

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“…However, under harsh reaction conditions, conventional Pt catalysts suffer from low olefin selectivity and fast deactivation via coke deposition. Various strategies have been used to overcome these problems, such as alloying with other elements (e.g., Sn, − Zn, − Ga, − Cu, − Fe, Ga–Pb, and rare-earth), and the introduction of base promoters (alkali ions such as K + ) ,,,, on the support surface. The catalyst properties can be substantially improved by combining these strategies, but complete inhibition of catalyst deactivation via coke formation is still not possible under the harsh reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Interplay of Ga, Pt, and Ce on the Alumina Surface Enabling High Activity, Selectivity, and Stability in Propane Dehydrogenation

Kwon

Park

et al. 2021

ACS Catal.

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Pt-based bimetallic catalysts have been widely investigated in propane dehydrogenation (PDH) owing to their high activity in C−H cleavage and propylene selectivity. However, upon repeated coke oxidation for catalyst regeneration, they suffer from significant metal sintering and dealloying. Recently, γ-Al 2 O 3 doped with Ga, Pt, and Ce was reported to exhibit superior catalytic activity, selectivity, and stability in PDH, but the catalytic role of each element has not been clearly understood because of the complexity of this system. In this study, we rigorously investigated the reaction mechanism and catalytic interplay of each component (Ga, Pt, and Ce). Selective poisoning, in situ diffuse reflectance infrared Fourier transform spectroscopy, and H 2 −D 2 exchange revealed that Ga 3+ is responsible for the heterolytic dissociation of the C−H bond of propane, while Pt 0 facilitates the sluggish H recombination into H 2 via reverse spillover. Catalyst deactivation during repeated reaction− regeneration cycles is mainly due to the irreversible sintering of Pt 0 . Notably, optimal Ce doping (∼2 wt %) selectively generated atomically dispersed Ce 3+ sites on the γ-Al 2 O 3 surface, which greatly suppressed the sintering of Pt 0 particles by increasing the metal−support interactions. In contrast, excessive Ce loading generated discrete CeO 2 domains, which stabilized the Pt species in the form of Pt 2+ inactive for H recombination. Thus, excessive Ce loading led to an even more severe loss of catalytic activity and selectivity. The present results demonstrate that the selective generation of atomically dispersed Ce 3+ on the γ-Al 2 O 3 surface is important for stabilizing Pt 0 species, which is essential for simultaneously achieving high catalytic activity, selectivity, and longevity in PDH.

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Effect of group IB metals on the dehydrogenation of propane to propylene over anti-sintering Pt/MgAl2O4

Cited by 78 publications

References 53 publications

Catalytic Property and Stability of Subnanometer Pt Cluster on Carbon Nanotube in Direct Propane Dehydrogenation

Catalytic Property and Stability of Subnanometer Pt Cluster on Carbon Nanotube in Direct Propane Dehydrogenation

Glycerol aerobic oxidation to glyceric acid over Pt/hydrotalcite catalysts at room temperature

Catalytic Interplay of Ga, Pt, and Ce on the Alumina Surface Enabling High Activity, Selectivity, and Stability in Propane Dehydrogenation

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