scholarly journals Carbon Formation and Active Site of Alumina Supported Platinum Catalyst in Steam Methane Reforming Containing Sulfur

2020 ◽  
Vol 63 (2) ◽  
pp. 89-95
Author(s):  
Fumihiro WATANABE ◽  
Ikuko KABURAKI ◽  
Kazumasa OSHIMA ◽  
Naohiro SHIMODA ◽  
Akira IGARASHI ◽  
...  
Keyword(s):  
Active Site ◽  
Platinum Catalyst ◽  
Methane Reforming ◽  
Carbon Formation ◽  
Steam Methane Reforming ◽  
Steam Methane ◽  
Supported Platinum ◽  
Supported Platinum Catalyst

scholarly journals Thermodynamic analysis of carbon formation conditions in a steam methane reforming process

2020 ◽  
pp. 136-136
Author(s):  
Dmitry Pashchenko ◽  
Maria Gnutikova
Keyword(s):  
Thermodynamic Analysis ◽  
Chemical Reactions ◽  
Operating Conditions ◽  
Mass Action ◽  
Equilibrium Analysis ◽  
Methane Reforming ◽  
Carbon Formation ◽  
Operational Conditions ◽  
Steam Methane Reforming ◽  
Steam Methane

Thermodynamic equilibrium analysis of the steam methane reforming process to synthesis gas was studied. For this purpose, the system of chemical reactions for carbon production and consumation as well as other side reaction in the steam methane reforming process were analysed. The material balance and the equations of law mass action were obtained for various chemical reactions. The system of those equations were solved by dichotomy method. The investigation was performed for a wide range of operational conditions such as a temperature, pressure, and inlet steam-to-methane ratio. The results obtained, with the help of developed algorithms, were compared with the results obtained via different commercial and open-source programs. All results are in excellent agreement. The operational conditions for the probable formation of carbon were determined. It was established that for the temperature range above 1100K the probability of carbon formation is absent for steam-to-methane ratio above units. The presented algorithm of thermodynamic analysis gives an appearance of the dependence of the product composition and the amount of required heat from operating conditions such as the temperature, pressure and steam-to-methane ratio.

3D CFD Simulations of Local Carbon Formation in Steam Methane Reforming Catalyst Particles

2017 ◽  
Vol 15 (6) ◽  
Author(s):  
Mohsen Behnam ◽  
Anthony G. Dixon
Keyword(s):  
Hot Spots ◽  
Tube Wall ◽  
Particle Diameter ◽  
Catalyst Particle ◽  
Operating Conditions ◽  
Methane Reforming ◽  
Carbon Formation ◽  
Cfd Simulations ◽  
Steam Methane Reforming ◽  
Steam Methane

Abstract The deactivation of catalysts is an important problem in the strongly endothermic steam methane reforming reaction. The local carbon laydown on the catalyst surface may lead to local hot spots, breakage of catalyst particles, and blockage of the reactor tube. Local carbon formation was studied at different operating conditions using particle-scale 3D CFD models of full and hollow cylindrical particles. The results showed that a low steam-to-carbon ratio may cause local carbon formation at high temperature (\gt900K) on the surface of the catalyst particle. The risk of carbon formation was highest at the surface hot spots and inside the catalyst particles where the methane cracking reaction rate exceeded those of the gasification reactions. The internal surface in the 1-hole catalyst particle showed favorable conditions for carbon formation and deposition, similarly to the external surface of the particle. 3D CFD simulations of a 0.76 m length of a full tube of spherical catalyst particles with tube-to-particle diameter ratio 5.96 showed that the rate of carbon formation was much higher next to the heated tube wall and decreased significantly from the tube wall to the tube center.

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