Promoting effect of Ge on Pt-based catalysts for dehydrogenation of propane to propylene

Rimaz, Sajjad; Chen, Luwei; Kawi, Sibudjing; Borgna, Armando

doi:10.1016/j.apcata.2019.117266

Cited by 67 publications

(41 citation statements)

References 57 publications

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“…The spent catalysts were characterized to further shed light on the relationship between the improved catalytic performance and the structure of PtZn@S‐1. TGA measurements of the spent catalysts were conducted to quantify the content of carbon deposition, 67 and the results are depicted in Figure 5B,C. The mass loss before 300°C is mainly because of the volatilization of H 2 O.…”

Section: Resultsmentioning

confidence: 99%

PtZn intermetallic nanoalloy encapsulated in silicalite‐1 for propane dehydrogenation

Zhang

Zhai

et al. 2021

AIChE Journal

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Propane dehydrogenation (PDH) is one of the most effective methods to produce propylene. But the industrial Pt‐based catalysts often suffer from short‐term stability under the high temperature reaction environment (500–700°C) via sintering and coke deposition. Herein, stable PDH reaction in high propylene yield has been achieved by the confinement of Pt–Zn intermetallic alloys (IMAs) in the channels of silicalite‐1. Single‐site Zn in the MFI framework was found to play a key role on assisting and stabilizing the PtZn IMAs for efficient PDH. By the cooperative action of the spatial confined PtZn IMAs and the lattice confined framework Zn, high propylene selectivity (>99%) without obvious deactivation was realized on the as‐developed catalyst (PtZn@S‐1) under 600°C even after 90 h. The low deactivation constant (0.003 h−1) was 6 times lower than that of the industrial PtSn catalyst.

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Section: Resultsmentioning

confidence: 99%

PtZn intermetallic nanoalloy encapsulated in silicalite‐1 for propane dehydrogenation

Zhang

Zhai

et al. 2021

AIChE Journal

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“…Other studies show that the addition of GeO 2 to Pt/C changes the adsorption properties of CO on the platinum surface, [36] and that bimetallic PtGe/C catalyst presents an easier CO oxidation as well as a higher electrocatalytic activity in methanol oxidation [37] . Ge can boost the catalytic performance of Pt for dehydrogenation reactions or naphtha reforming too, and prevents the formation of undesired coke deposits [38–45] . Nevertheless, studies on the potential promotional effect of Ge are still very scarce, and it is unclear what effect Ge exerts on Pt in such catalytic processes.…”

Section: Introductionmentioning

confidence: 99%

Doping Platinum with Germanium: An Effective Way to Mitigate the CO Poisoning

et al. 2021

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The vulnerability towards CO poisoning is a major drawback affecting the efficiency and long‐term performance of platinum catalysts in fuel cells. In the present work, by a combination of density functional theory calculations and mass spectrometry experiments, we test and explain the promotional effect of Ge on Pt catalysts with higher resistance to deactivation via CO poisoning. A thorough exploration of the configurational space of gas‐phase Ptn+ and GePtn−1+ (n=5–9) clusters using global minima search techniques and the subsequent electronic structure analysis reveals that germanium doping reduces the binding strength between Pt and CO by hindering the 2π‐back‐donation. Importantly, the clusters remain catalytically active towards H2 dissociation. The ability of Ge to weaken the Pt−CO interaction was confirmed by mass spectrometry experiments. Ge can be a promising alloying agent to tune the selectivity and improve the durability of Pt particles, thus opening the way to novel catalytic alternatives for fuel cells.

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“…In addition, the decreasing reservation and increasing price of platinum materials and the toxicity of chromium compounds have also restricted the further development of propane anaerobic dehydrogenation technology. [12][13][14] With this influential background, continuous efforts have been made to further modify or enhance the traditional platinum-or chromium-based catalysts using promoters such as germanium, zinc, tin, indium and manganese etc., but the problems of carbon deposition and catalyst deactivation under high temperature still exist in these systems. [15] Therefore, there is still great scientific challenge for developing novel catalyst with high activity, low cost and sustainability for propane dehydrogenation.…”

Section: Introductionmentioning

confidence: 99%

“…The present solution for improving the activity and stability is the strategy introducing high temperature or high‐pressure steam to break the reaction equilibrium and prevent the deactivation of the catalyst, however, in this case, the reaction system has serious problems of high energy consumption and safety risk. In addition, the decreasing reservation and increasing price of platinum materials and the toxicity of chromium compounds have also restricted the further development of propane anaerobic dehydrogenation technology [12–14] …”

Section: Introductionmentioning

confidence: 99%

Efficient Non‐Precious Metal Catalyst for Propane Dehydrogenation: Atomically Dispersed Cobalt‐nitrogen Compounds on Carbon Nanotubes

et al. 2021

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A hybrid catalyst comprising atomically dispersed cobalt-nitrogen compounds anchoring on oxidized carbon nanotubes (OCNTs) is prepared and applied in propane dehydrogenation (PDH) reactions. The proposed non-precious catalyst exhibits high initial conversion (~20 %) and excellent selectivity of propene (> 95 %), which is superior to those of metal-free nanocarbon and some metal-based catalysts. The chemical composition and structure of the proposed hybrid catalysts are elucidated by a series of characterizations and control experiments with a single component. These characterization results combined with the kinetic analysis indicate that the catalytic activity mainly originates from the cobalt-nitrogen (CoÀ N) species supported on the OCNT surface. The present work sheds light on the structure-function relationships of CoN catalysts, paving the way to develop nonprecious catalysts for PDH reactions.

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Promoting effect of Ge on Pt-based catalysts for dehydrogenation of propane to propylene

Cited by 67 publications

References 57 publications

PtZn intermetallic nanoalloy encapsulated in silicalite‐1 for propane dehydrogenation

PtZn intermetallic nanoalloy encapsulated in silicalite‐1 for propane dehydrogenation

Doping Platinum with Germanium: An Effective Way to Mitigate the CO Poisoning

Efficient Non‐Precious Metal Catalyst for Propane Dehydrogenation: Atomically Dispersed Cobalt‐nitrogen Compounds on Carbon Nanotubes

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