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.

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

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.

scholarly journals Effect of Direct Reduction Treatment on Pt–Sn/Al2O3 Catalyst for Propane Dehydrogenation

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 446 ◽  
Author(s):  
Jae-Won Jung ◽  
Won-Il Kim ◽  
Jeong-Rang Kim ◽  
Kyeongseok Oh ◽  
Hyoung Lim Koh
Keyword(s):  
Catalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Direct Reduction ◽  
Coke Formation ◽  
Catalytic Performance ◽  
Propane Dehydrogenation ◽  
X Ray ◽  
Transmission Electron ◽  
Calcination Step ◽  
Xrd Patterns

Pt–Sn/Al2O3 catalysts were prepared by the direct reduction method at temperatures from 450 to 900 °C, denoted as an SR series (SR450 to SR900 according to reduction temperature). Direct reduction was performed immediately after catalyst drying without a calcination step. The activity of SR catalysts and a conventionally prepared (Cal600) catalyst were compared to evaluate its effect on direct reduction. Among the SR catalysts, SR550 showed overall higher conversion of propane and propylene selectivity than Cal600. The nano-sized dispersion of metals on SR550 was verified by transmission electron microscopy (TEM) observation. The phases of the bimetallic Pt–Sn alloys were examined by X-ray diffraction, TEM, and energy dispersive X-ray spectroscopy (EDS). Two characteristic peaks of Pt3Sn and PtSn alloys were observed in the XRD patterns, and these phases affected the catalytic performance. Moreover, EDS confirmed the formation of Pt3Sn and PtSn alloys on the catalyst surface. In terms of catalytic activity, the Pt3Sn alloy showed better performance than the PtSn alloy. Relationships between the intermetallic interactions and catalytic activity were investigated using X-ray photoelectron spectroscopy. Furthermore, qualitative analysis of coke formation was conducted after propane dehydrogenation using differential thermal analysis.

Modeling of Coke Formation and Catalyst Deactivation in Propane Dehydrogenation Over a Commercial Pt-Sn/γ-Al2O3Catalyst

2013 ◽  
Vol 31 (23) ◽  
pp. 2451-2462 ◽  
Author(s):  
S. Niknaddaf ◽  
M. Soltani ◽  
A. Farjoo ◽  
F. Khorasheh
Keyword(s):  
Catalyst Deactivation ◽  
Coke Formation ◽  
Propane Dehydrogenation

Propane dehydrogenation over a Cr2O3/Al2O3 catalyst: transient kinetic modeling of propene and coke formation

2003 ◽  
Vol 248 (1-2) ◽  
pp. 105-116 ◽  
Author(s):  
J. Gascón ◽  
C. Téllez ◽  
J. Herguido ◽  
M. Menéndez
Keyword(s):  
Kinetic Modeling ◽  
Coke Formation ◽  
Propane Dehydrogenation ◽  
Al2o3 Catalyst

Modeling and Simulation Study of an Industrial Radial Moving Bed Reactor for Propane Dehydrogenation Process

2016 ◽  
Vol 14 (1) ◽  
pp. 33-44 ◽  
Author(s):  
Sim Yee Chin ◽  
Anwaruddin Hisyam ◽  
Haniif Prasetiawan
Keyword(s):  
Flow Reactor ◽  
Catalyst Activity ◽  
Coke Formation ◽  
Plug Flow ◽  
Propane Dehydrogenation ◽  
Propane Conversion ◽  
Reactor Model ◽  
Moving Bed ◽  
Coke Content ◽  
Experimental Values

AbstractAn accurate model is required to optimize the propane dehydrogenation reaction carried out in the radial moving bed reactors (RMBR). The present study modeled the RMBR using a plug flow reactor model incorporated with kinetic models expressed in simple power-law model. Catalyst activity and coke formation were also considered. The model was solved numerically by discretizing the RMBR in axial and radial directions. The optimized kinetic parameters were then used to predict the trends of propane conversion, temperature, catalyst activity and coke content in the RMBR along axial and radial directions. It was found that the predicted activation energies of the propane dehydrogenation, propane cracking and ethylene hydrogenation were in reasonable agreement with the experimental values reported in the literature. The model developed has accurately predicted the reaction temperature profile, conversion profile and catalyst coke content. The deviations of these simulated results from the plant data were less than 5%.

Highly Active and Selective PtSnM1/γ-Al2O3 Catalyst for Direct Propane Dehydrogenation

2021 ◽  
Vol 43 (3) ◽  
pp. 342-342
Author(s):  
Arshid M Ali Arshid M Ali ◽  
Abdulrahim A Zahrani Abdulrahim A Zahrani ◽  
Muhammad A Daous Muhammad A Daous ◽  
Muhammad Umar Seetharamulu Podila and Lachezar A Petrov Muhammad Umar Seetharamulu Podila and Lachezar A Petrov
Keyword(s):  
Catalytic Activity ◽  
Coke Formation ◽  
Protective Layer ◽  
Catalytic Performance ◽  
Active Species ◽  
Propane Dehydrogenation ◽  
Propane Conversion ◽  
Feed Composition ◽  
Highly Active ◽  
Al2o3 Catalyst

This study is aimed to understand the role of alkaline earth elements (AEE) to the catalytic performance of PtSnM1/γ-Al2O3catalystfor the direct propane dehydrogenation (where M1 = Mg, Ca, Sr, Ba). All the catalysts were prepared by using wet impregnation.The overall catalytic performance of all the catalysts was studied at different reaction temperatures, feed composition ratios and GHSV. The best operating reaction conditions were575and#186;C, feed composition ratio of C3H8:H2:N2 = 1.0:0.5:5.5 and GHSV of 3800h-1. An optimal addition of “Ca” to PtSn//γ-Al2O3 catalyst, enhanced the catalytic activity of PtSnM1/γ-Al2O3 catalyst in comparison to other studied AEE. This catalyst had shown the highest propane conversion (~ 55.8 %) with 95.7 % propylene selectivity and least coke formation (7.11 mg.g-1h-1). In general, the increased catalytic activity of PtSnM1/γ-Al2O3 is attributed to the reduced coking extent during the reaction. In addition, the enhanced thermal stability of the PtSnCa/γ-Al2O3catalystis because of the protective layer betweenγ-Al2O3 and active metal, which allows the formation of active species such as PtSn, PtCa2 and Pt2Al phases?

Sign in / Sign up

Export Citation Format

Share Document