The effect of oxygenate additives on the performance of Pt–Sn/γ - Al2O3 catalyst in the propane dehydrogenation process

Fattahi, Moslem; Khorasheh, Farhad; Sahebdelfar, Saeed; Zangeneh, Farnaz Tahriri; Kamran, Ganji; Saeedizad, Maryam

doi:10.1016/j.scient.2011.08.015

Cited by 22 publications

(18 citation statements)

References 32 publications

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“…Dong et al 24 found that under the same propane partial pressure, steam can contribute to higher propene yield compared with that in nitrogen atmosphere. However, the results reported by Fattahi et al 25 and our group 26 have shown that the promoting effect of steam on PDH over alumina supported Pt-Sn catalyst is only valid in a certain range of steam amount.…”

Section: Introductionmentioning

confidence: 72%

Insights into the effects of steam on propane dehydrogenation over a Pt/Al₂O₃ catalyst

Shan

Zhu

Sui

et al. 2015

Catal. Sci. Technol.

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Catalytic propane dehydrogenation over an alumina supported Pt catalyst in the presence of steam is carried out and it is found that the catalyst activity is increased and the apparent activation energy lowered due to the presence of steam. Three possible mechanisms, i.e. co-adsorption, Langmuir-Hinshelwood and Eley-Rideal, of changes in energetics and pathways for propane dehydrogenation due to the presence of steam are explored by DFT calculation. The results show that co-adsorption of C 3 species with the surface oxygenated species would elevate dehydrogenation energy barriers due to repulsion interactions between them. Surface -OH is more active than surface -O in activating C-H bond in propane and propyl species through either Langmuir-Hinshelwood or Eley-Rideal mechanism and plays an important role in propane dehydrogenation with steam. The Langmuir-Hinshelwood mechanism is kinetically favorable, in which the activations of the first H in propane by surface -OH are the rate determining steps, but the activation energies are higher than that on clean Pt(111) surface. The observed enhanced catalyst's activity is ascribed to the lowered coking rates as well as the changes in surface coverage due to the co-adsorption of mechanism. For PDH under steam atmosphere, the role of surface -OH is essential, most likely through Langmuir-Hinshelwood mechanism, in which the first C-H bond activation is the rate determining step in the overall PDH reaction route. The promoting effect of steam can be ascribed to the removal of cokes deposited on active Pt surfaces and the changes of adsorption species coverage on Pt surface.

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Section: Introductionmentioning

confidence: 72%

Insights into the effects of steam on propane dehydrogenation over a Pt/Al₂O₃ catalyst

Shan

Zhu

Sui

et al. 2015

Catal. Sci. Technol.

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“…The experimental data used in this study along with details of the equipment, experiments and analytical procedures were reported in a previous investigation (Fattahi et al, 2011) where PDH was performed in the presence of small amounts of water over a commercial Pt-Sn/γ -Al 2 O 3 catalyst in a conventional tubular fixed-bed quartz reactor. The reactor was 90 cm long with an inside diameter of 12 mm and 1 g of catalyst was loaded in the middle section of reactor in between two layers of quartz particles.…”

Section: Experimental Methods and Materialsmentioning

confidence: 99%

“…Addition of small amounts of water can result in the formation of hydroxyl groups that would facilitate the H β -elimination step (Fattahi et al, 2011). The proposed mechanism for catalytic dehydrogenation of propane in presence of small amounts of water can be represented by reaction steps 4.1-4.8 as follows:…”

Section: Mechanism and Kinetics Of Propane Dehydrogenation In The Prementioning

confidence: 99%

“…Very few investigations, however, have reported the effect of steam and its interaction mechanism in catalytic dehydrogenation of light alkanes (Duprez et al, 1989;Kogan and Herskowitz, 2001). In a previous study (Fattahi et al, 2011), catalytic PDH over a commercial Pt-Sn/γ -Al 2 O 3 catalyst was carried in the presence of small amounts of water as an oxygenated additive. The presence of water suppressed coke formation and at the same time enhanced catalyst sintering.…”

Section: Introductionmentioning

confidence: 99%

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The Modeling of Kinetics and Catalyst Deactivation in Propane Dehydrogenation Over Pt-Sn/γ-Al₂O₃in Presence of Water as an Oxygenated Additive

Barghi

Fattahi

Khorasheh

2014

Petroleum Science and Technology

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A reduction in catalyst's activity with time-on-stream and the formation of side products are two of the problems associated with catalytic propane dehydrogenation (PDH). Previous studies have indicated that the presence of small amounts of oxygenated additives such as water can reduce coke formation and enhance catalyst activity. The aim of the present work was to develop an appropriate kinetic model for PDH over a commercial Pt-Sn/γ -Al 2 O 3 catalyst in the presence of small amounts of water. Experimental data were obtained from a previous study where catalytic PDH was carried out in a bench scale reactor system at atmospheric pressure in the temperature range of 575-620 • C in the presence of different amounts of water. The kinetics of the main dehydrogenation reaction were described in terms of a Langmuir-Hinshelwood rate expression and the effects of water on coke deposition and catalyst sintering were considered in a catalyst deactivation model to explain the observed optimum level in the amount of added water.

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“…Due to their thermal, chemical and mechanical stability, hydrated alumina or aluminum hydroxides find potential applications as ceramic oxides, 1 adsorbents, 2 catalysts, 3 catalyst supports 4 and are mainly used as refractory materials, 5 electrical insulators, 6 in electronics 7 and for ceramic membranes. 8 From another point of view, important usages requiring large tonnages of hydrated alumina or aluminum hydroxides are as fillers in polymer and plastics products and for the production of aluminum chemicals.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of micro-mesopores flowerlike γ-Al2O3 nano-architectures

Abdollahifar

Zamani

Beiygie

et al. 2014

JSCS

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Micro-mesopores flowerlike γ-Al 2 O 3 nano-architectures were synthesized by a thermal decomposition method using synthesized AlOOH (boehmite) as a precursor. After calcination at 500 °C for 5 h, the obtained flower-like γ-Al 2 O 3 had a structure similar to that of the AlOOH precursor. X-Ray diffraction (XRD), FTIR, TG, FESEM and TEM techniques were used to characterize morphology and structure of the synthesized samples. The specific surface area (BET), pore volume and pore-size distribution of the products were determined by N 2 adsorption-desorption measurements. The flower-like γ-Al 2 O 3 showed a high BET specific surface area of 148 m 2 g -1 with a total pore volume of 0.59 cm 3 g -1 .

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The effect of oxygenate additives on the performance of Pt–Sn/γ - Al2O3 catalyst in the propane dehydrogenation process

Cited by 22 publications

References 32 publications

Insights into the effects of steam on propane dehydrogenation over a Pt/Al₂O₃ catalyst

Insights into the effects of steam on propane dehydrogenation over a Pt/Al₂O₃ catalyst

The Modeling of Kinetics and Catalyst Deactivation in Propane Dehydrogenation Over Pt-Sn/γ-Al₂O₃in Presence of Water as an Oxygenated Additive

Synthesis of micro-mesopores flowerlike γ-Al2O3 nano-architectures

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The effect of oxygenate additives on the performance of Pt–Sn/γ - Al2O3 catalyst in the propane dehydrogenation process

Cited by 22 publications

References 32 publications

Insights into the effects of steam on propane dehydrogenation over a Pt/Al2O3 catalyst

Insights into the effects of steam on propane dehydrogenation over a Pt/Al2O3 catalyst

The Modeling of Kinetics and Catalyst Deactivation in Propane Dehydrogenation Over Pt-Sn/γ-Al2O3in Presence of Water as an Oxygenated Additive

Synthesis of micro-mesopores flowerlike γ-Al2O3 nano-architectures

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Product

Resources

About

Insights into the effects of steam on propane dehydrogenation over a Pt/Al₂O₃ catalyst

Insights into the effects of steam on propane dehydrogenation over a Pt/Al₂O₃ catalyst

The Modeling of Kinetics and Catalyst Deactivation in Propane Dehydrogenation Over Pt-Sn/γ-Al₂O₃in Presence of Water as an Oxygenated Additive