scholarly journals Effect of Hydrogen Ratio and Tin Addition on the Coke Formation of Platinum Catalyst for Propane Dehydrogenation Reaction

2016 ◽  
Vol 22 (2) ◽  
pp. 82-88
Author(s):  
Soo Young Kim ◽  
Ga Hee Kim ◽  
Hyoung Lim Koh
Keyword(s):  
Platinum Catalyst ◽  
Coke Formation ◽  
Propane Dehydrogenation ◽  
Dehydrogenation Reaction

ESR Study on the Nature of Active Site of Silica-supported Chromia in Propane Dehydrogenation Reaction

1999 ◽  
Vol 28 (8) ◽  
pp. 761-762
Author(s):  
Hu Zou ◽  
Yuwang Han ◽  
Weijie Ji ◽  
Jianyi Shen
Keyword(s):  
Active Site ◽  
Propane Dehydrogenation ◽  
Dehydrogenation Reaction

scholarly journals Effect of Boron Promotion on Coke Formation during Propane Dehydrogenation over Pt/γ-Al2O3 Catalysts

ACS Catalysis ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 5208-5216 ◽  
Author(s):  
Mostafa Aly ◽  
Esteban L. Fornero ◽  
Andres R. Leon-Garzon ◽  
Vladimir V. Galvita ◽  
Mark Saeys
Keyword(s):  
Coke Formation ◽  
Propane Dehydrogenation

Coke Formation on Pt–Sn/Al2O3 Catalyst in Propane Dehydrogenation: Coke Characterization and Kinetic Study

2011 ◽  
Vol 54 (13-15) ◽  
pp. 888-896 ◽  
Author(s):  
Qing Li ◽  
Zhijun Sui ◽  
Xinggui Zhou ◽  
Yian Zhu ◽  
Jinghong Zhou ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Coke Formation ◽  
Propane Dehydrogenation ◽  
Coke Characterization ◽  
Al2o3 Catalyst

scholarly journals Pt-Sn Supported on Beta Zeolite with Enhanced Activity and Stability for Propane Dehydrogenation

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 25
Author(s):  
Su-Un Lee ◽  
You-Jin Lee ◽  
Soo-Jin Kwon ◽  
Jeong-Rang Kim ◽  
Soon-Yong Jeong
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
High Surface ◽  
Coke Formation ◽  
Propane Dehydrogenation ◽  
Coke Deposition ◽  
Beta Zeolite ◽  
Lower Amount ◽  
Metal Catalyst ◽  
Beta Zeolites

With the growing global propylene demand, propane dehydrogenation (PDH) has attracted great attention for on-purpose propylene production. However, its industrial application is limited because catalysts suffer from rapid deactivation due to coke deposition and metal catalyst sintering. To enhance metal catalyst dispersion and coke resistance, Pt-based catalysts have been widely investigated with various porous supports. In particular, zeolite can benefit from large surface area and acid sites, which favors high metal dispersion and promoting catalytic activity. In this work, we investigated the PDH catalytic properties of Beta zeolites as a support for Pt-Sn based catalysts. In comparison with Pt-Sn supported over θ-Al2O3 and amorphous silica (Q6), Beta zeolite-supported Pt-Sn catalysts exhibited a different reaction trend, achieving the best propylene selectivity after a proper period of reaction time. The different PDH catalytic behavior over Beta zeolite-supported Pt-Sn catalysts has been attributed to their physicochemical properties and reaction mechanism. Although Pt-Sn catalyst supported over Beta zeolite with low acidity showed low Pt dispersion, it formed a relatively lower amount of coke on PDH reaction and maintained a high surface area and active Pt surfaces, resulting in enhanced stability for PDH reaction. This work can provide a better understanding of zeolite-supported Pt-Sn catalysts to improve PDH catalytic activity with high selectivity and low coke formation.

Sn-Modified ZSM-5 As Support for Platinum Catalyst in Propane Dehydrogenation

2011 ◽  
Vol 50 (13) ◽  
pp. 7896-7902 ◽  
Author(s):  
Yiwei Zhang ◽  
Yuming Zhou ◽  
Li Huang ◽  
Mengwei Xue ◽  
Shaobo Zhang
Keyword(s):  
Platinum Catalyst ◽  
Propane Dehydrogenation

scholarly journals Strain in Silica-Supported Ga (III) Sites: Neither Too Much nor Too Little for Propane Dehydrogenation Catalytic Activity

2020 ◽  
Author(s):  
C. S. Praveen ◽  
A. P. Borosy ◽  
Christophe Copéret ◽  
Aleix Comas Vives
Keyword(s):  
Catalytic Activity ◽  
Propane Dehydrogenation ◽  
Intrinsic Activity ◽  
Dehydrogenation Reaction ◽  
The Road ◽  
Highly Active ◽  
Beta Hydride Elimination ◽  
Hydride Elimination ◽  
Single Site Catalysts ◽  
Highly Strained

<p>Well-defined Ga(III) sites on SiO<sub>2</sub> are highly active, selective, and stable catalysts in the propane dehydrogenation reaction. In this contribution, we evaluate the catalytic activity towards propane dehydrogenation of tri-coordinated and tetra-coordinated Ga(III) sites on SiO<sub>2</sub> by means of first principles calculations using realistic amorphous periodic SiO<sub>2</sub>models. We evaluated the three reaction steps in propane dehydrogenation, namely the C-H activation of propane to form propyl, the beta-hydride elimination transfer to form propene, and a Ga-hydride, and the H-H coupling to release H<sub>2</sub>, regenerating the initial Ga-O bond and closing the catalytic cycle. Our work shows how Brønsted-Evans-Polanyi relationships are followed for these three reaction steps on Ga(III) sites on SiO<sub>2</sub> and highlights the role of the strain of the reactive Ga-O pairs on such sites of realistic amorphous SiO<sub>2</sub> models. While highly strained sites are very reactive sites for the initial C-H activation, they are more difficult to regenerate. The corresponding less strained sites are not reactive enough, pointing to the need of a right balance in strain to be an effective site for propane dehydrogenation. Overall, our work provides an understanding of the intrinsic activity of acidic Ga single sites towards the propane dehydrogenation reaction and paves the road towards the design and prediction of better single-site catalysts on SiO<sub>2 </sub>for the propane dehydrogenation reaction.</p>

scholarly journals Coke Formation on Pt–Sn/Al2O3 Catalyst for Propane Dehydrogenation

2018 ◽  
Vol 57 (26) ◽  
pp. 8647-8654 ◽  
Author(s):  
Hai-Zhi Wang ◽  
Li-Li Sun ◽  
Zhi-Jun Sui ◽  
Yi-An Zhu ◽  
Guang-Hua Ye ◽  
...  
Keyword(s):  
Coke Formation ◽  
Propane Dehydrogenation ◽  
Al2o3 Catalyst

Kinetic Modelling of Propane Dehydrogenation over a Pt–Sn/hierarchical SAPO-34 Zeolite Catalyst, Including Catalyst Deactivation

2017 ◽  
Vol 42 (4) ◽  
pp. 344-360
Author(s):  
Milad Komasi ◽  
Shohreh Fatemi ◽  
Seyed Hesam Mousavi
Keyword(s):  
Catalyst Deactivation ◽  
Kinetic Modelling ◽  
Coke Formation ◽  
Fixed Bed ◽  
Reaction Network ◽  
Normal Pressure ◽  
Fixed Bed Reactor ◽  
Propane Dehydrogenation ◽  
Coke Deposition ◽  
Formation Kinetic

Pt–Sn/hierarchical SAPO-34 was synthesised and kinetically modelled as an efficient and selective catalyst for propylene production through propane dehydrogenation. The kinetics of the reaction network were studied in an integral fixed-bed reactor at three temperatures of 550, 600 and 650 °C and weight hourly space velocities of 4 and 8 h−1 with a feed containing hydrogen and propane with relative molar ratios of 0.2, 0.5 and 0.8, at normal pressure. The experiments were performed in accordance with the full factorial experimental design. The kinetic models were constructed on the basis of different mechanisms and various deactivation models. The kinetics and deactivation parameters were simultaneously predicted and optimised using genetic algorithm optimisation. It was further proven that the Langmuir–Hinshelwood model can well predict propane dehydrogenation kinetics through lumping together all the possible dehydrogenation steps and also by assuming the surface reaction as the rate-determining step. A coke formation kinetic model has also shown appropriate results, confirming the experimental data by equal consideration of both monolayer and multilayer coke deposition kinetic orders and an exponential deactivation model.

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