Ethane aromatization on Ga-Pt/HZSM-5 zeolites prepared by solid-state modification

Лапидус, А. Л.; Pavlova, V. A.; Nekrasov, N. V.; Dergachev, A. A.

doi:10.1134/s0965544110020052

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…Sintering of the metal phase under high-temperature conditions is another very important factor for deactivation of the catalysts, and extensive studies have been conducted to determine factors that can stabilize and inhibit sintering of the metal phase. For example, in an alumina-supported Pt catalyst treated under high-temperature oxidizing conditions, scanning transmission electron microscopy/transmission electron microscopy (STEM/TEM) imaging,Al magic angle spinning (MAS) nuclear magnetic resonance (NMR), extended X-ray absorption fine structure (EXAFS), and density functional theory (DFT) calculations were used to show that atomic or subnanometer Pt species could be stabilized and become sinter resistant because of their strong interactions with the pentacoordinated Al 3+ sites on the γ-Al 2 O 3 (100) surface. , Typically, a second metal component, such as Sn ,− and Ga, ,− is added to the catalyst formulation, which forms an alloy with Pt under reaction conditions, increasing conversion and propene selectivity, inhibiting metal sintering, and suppressing coke formation. Recently, more earth abundant metals, such as Cu, have been used as promoters to form an alloy with Pt with similar effects, such as inhibiting propene adsorption and suppressing side reactions, increasing propene selectivity and yield, and reducing the level of coke formation .…”

Section: Introductionmentioning

confidence: 99%

Role of Sn in the Regeneration of Pt/γ-Al₂O₃ Light Alkane Dehydrogenation Catalysts

et al. 2016

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Alumina-supported Pt is one of the major industrial catalysts for light alkane dehydrogenation. This catalyst loses activity during reaction, with coke formation often considered as the reason for deactivation. As we show in this study, the amount and nature of carbon deposits do not directly correlate with the loss of activity. Rather, it is the transformation of subnanometer Pt species into larger Pt nanoparticles that appears to be responsible for the loss of catalytic activity. Surprisingly, a portion of the Sn remains atomically dispersed on the alumina surface in the spent catalyst and helps in the redispersion of the Pt. In the absence of Sn on the alumina support, the larger Pt nanoparticles formed during reaction are not redispersed during oxidative regeneration. It is known that Sn is added as a promoter in the industrial catalyst to help in achieving high propene selectivity and to minimize coke formation. This work shows that an important role of Sn is to help in the regeneration of Pt, by providing nucleation sites on the alumina surface. Aberration-corrected scanning transmission electron microscopy helps to provide unique insights into the operating characteristics of an industrially important catalyst by demonstrating the role of promoter elements, such as Sn, in the oxidative regeneration of Pt on γ-Al2O3.

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Section: Introductionmentioning

confidence: 99%

Role of Sn in the Regeneration of Pt/γ-Al₂O₃ Light Alkane Dehydrogenation Catalysts

et al. 2016

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“…BTX aromatic hydrocarbons are considered as valuable intermediates in the chemical and petrochemical applications. [1][2][3][4][5][6] The modified medium-pore zeolites ZSM-5 by metals such as zinc, 7,8 gallium 9,10 or platinum 11 have been chosen as catalysts for different light alkanes aromatizaion. The incorporation of metal species leads to the additional dehydrogenation activity of the protonic form HZSM-5.…”

Section: Introductionmentioning

confidence: 99%

Kinetic study of propane aromatization over Zn/HZSM-5 zeolite under conditions of catalyst deactivation using genetic algorithm

Roshanaei

Alavi

2018

JSCS

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The kinetic studies of propane aromatization reaction over Zn/ /HZSM-5 catalyst at temperature of 500-560 °C and space velocity of 500-2500 cm 3 g cat-1 h-1 , in a plug flow reactor, under catalyst deactivating conditions were performed. A lumped kinetic model consisting of six lumped components and six reaction steps was proposed to describe the aromatization of propane. The kinetic model involves 18 kinetic parameters and one catalyst deactivation constant. The reaction steps orders were obtained by the power law model. Frequency factors and the apparent activation energies of the reaction steps were calculated based on the Arrhenius equation. An exponential function depending on the time-on-stream was applied for the catalyst deactivation model and the kinetic parameters were calculated via a genetic algorithm. The kinetic results indicated that the lumped kinetic model can well estimate the product yields of propane aromatization.

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Light Alkane Dehydroaromatization over Pt-Zn/HZSM-5 Catalyst with Ultralow Pt Loading

Chen,

Griffin,

Qiang

et al. 2024

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Ethane aromatization on Ga-Pt/HZSM-5 zeolites prepared by solid-state modification

Cited by 6 publications

References 7 publications

Role of Sn in the Regeneration of Pt/γ-Al₂O₃ Light Alkane Dehydrogenation Catalysts

Role of Sn in the Regeneration of Pt/γ-Al₂O₃ Light Alkane Dehydrogenation Catalysts

Kinetic study of propane aromatization over Zn/HZSM-5 zeolite under conditions of catalyst deactivation using genetic algorithm

Light Alkane Dehydroaromatization over Pt-Zn/HZSM-5 Catalyst with Ultralow Pt Loading

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Ethane aromatization on Ga-Pt/HZSM-5 zeolites prepared by solid-state modification

Cited by 6 publications

References 7 publications

Role of Sn in the Regeneration of Pt/γ-Al2O3 Light Alkane Dehydrogenation Catalysts

Role of Sn in the Regeneration of Pt/γ-Al2O3 Light Alkane Dehydrogenation Catalysts

Kinetic study of propane aromatization over Zn/HZSM-5 zeolite under conditions of catalyst deactivation using genetic algorithm

Light Alkane Dehydroaromatization over Pt-Zn/HZSM-5 Catalyst with Ultralow Pt Loading

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Role of Sn in the Regeneration of Pt/γ-Al₂O₃ Light Alkane Dehydrogenation Catalysts

Role of Sn in the Regeneration of Pt/γ-Al₂O₃ Light Alkane Dehydrogenation Catalysts