Thermodynamic analysis of ethanol steam reforming using Gibbs energy minimization method: A detailed study of the conditions of carbon deposition

2009 ◽  
Vol 34 (10) ◽  
pp. 4321-4330 ◽  
Author(s):  
Aline Lima da Silva ◽  
Célia de Fraga Malfatti ◽  
Iduvirges Lourdes Müller
2012 ◽  
Author(s):  
Nor Aishah Saidina Amin ◽  
Ee Peng Soon

Kaedah peminimuman jumlah tenaga Gibbs sangat berguna untuk menganalisis kemungkinan penukaran metana kepada hidrokarbon dan syngas pada suhu dan tekanan tertentu secara teoritikal. Keputusan numerik menunjukkan penukaran metana meningkat dengan peningkatan kepekatan oksigen dan suhu tindak balas. Bagaimanapun, kehadiran oksigen merencat pembentukan hidrokarbon tinggi yang kebanyakannya mengandungi aromatik, tetapi menggalakkan pembentukan hidrogen. Apabila tekanan sistem bertambah, hasil aromatik, olefin dan hidrogen berkurang, tetapi hasil parafin meningkat. Karbon monoksida menjadi produk mengandungi oksigen yang utama daripada pengoksidaan metana sementara hampir tiada H2O, CH3OH and HCOH yang dikesan walaupun sejumlah kecil karbon dioksida terbentuk pada suhu yang agak rendah dan tekanan tinggi. Kata kunci: Keseimbangan kimia termodinamik, peminimuman jumlah tenaga Gibbs, penukaran metana, hidrokarbon tinggi The total Gibbs energy minimization method is useful to theoretically analyze the feasibility of methane conversion to higher hydrocarbons and syngas at the selected temperature and pressure. Numerical results showed that the conversion of methane increased with oxygen concentration and reaction temperature, but decreased with pressure. Nevertheless, the presence of oxygen suppressed the formation of higher hydrocarbons that mostly consisted of aromatics, but enhanced the formation of hydrogen. As the system pressure increased, the aromatics, olefins and hydrogen yields diminished, but the paraffin yield improved. Carbon monoxide seemed to be the major oxygen-containing equilibrium product from methane oxidation whilst almost no H2O, CH3OH and HCOH were detected although traces amount of carbon dioxide were formed at relatively lower emperature and higher pressure. Key words: Thermodynamic chemical equilibrium, Gibbs energy minimization, methane conversion, higher hydrocarbons


2019 ◽  
Vol 2 (8(38)) ◽  
pp. 3-5
Author(s):  
Бердзенишвили И. Г.

The article deals with the thermodynamic approach for describing chemical processes and phenomena. It is shown that the Gibbs energy minimization method is successfully used to assess the possibility of a spontaneous reaction in isobaric-isothermal conditions. The author analyzes ways to implement this thermodynamic method for studying chemical processes. In order to disclose the content of a scientific concept “isobaric potential of formation of a substance”, an algorithm for constructing this definition is proposed, which is based on detailing of all its components.


2013 ◽  
Vol 58 (10) ◽  
pp. 1197-1202 ◽  
Author(s):  
V. A. Bychinskii ◽  
A. A. Tupitsyn ◽  
K. V. Chudnenko ◽  
A. V. Mukhetdinova ◽  
S. V. Fomichev ◽  
...  

Nanoscale ◽  
2020 ◽  
Vol 12 (31) ◽  
pp. 16605-16616
Author(s):  
Rong Dai ◽  
Ziliang Zheng ◽  
Chenshuai Lian ◽  
Kai Shi ◽  
Xu Wu ◽  
...  

The core@shell Ni–Cu@CS nanocatalyst synthesized via a reverse micelle system exhibited an excellent anti-sintering performance, while the unique characteristics of its shell suppress carbon deposition in the ESR reaction.


2012 ◽  
Vol 457-458 ◽  
pp. 314-319 ◽  
Author(s):  
Qiu Jie Shi ◽  
Bin Li ◽  
Wei Qing Chen ◽  
Cheng Wei Liu ◽  
Bi Wu Huang

A series of Ni-Ru bimetallic catalysts over La2O2CO3 are prepared by an impregnation method. The catalytic properties are evaluated in ethanol steam reforming reaction from 350 to 700 °C under atmospheric pressure. Ni-Ru/La2O2CO3 containing 6 wt% Ni and 3 wt% Ru is found to be more efficient, and Ni-La composite oxide could be formed in the catalyst. Ru is more active in the ethanol dehydration reaction to form ethylene than Ni. The presence of Ru could improve the selectivity for hydrogen of Ni catalyst. TG results reveal that Ni-Ru/La2O2CO3 has excellent resistance to carbon deposition.


2012 ◽  
Vol 512-515 ◽  
pp. 2257-2261 ◽  
Author(s):  
Hong Da Wu ◽  
Ying Gui Jia ◽  
Yu Yin ◽  
Lue Zhao

Y2O3-ZrO2 support was prepared by two-step precipitation method with ammonia and oxalic acid. A series of Cu-Ni/Y2O3-ZrO2 catalysts were prepared by impregnation method. The catalysts were investigated and then characterized by XRD and SEM results. The activity of catalysts in ethanol steam reforming was studied. The effects of the catalyst composition on the ethanol conversion rate were discussed and the catalysts inactivation phenomenon under the temperature ranging from 673K to 723K was then analyzed. The results show that 1Cu9Ni/1Y9Zr catalyst has higher activity in ethanol steam reforming, over which ethanol conversion rate is higher than 98% under the situation of 623K, while the inactivation of catalysts with Cu/Ni>3/7 at 673K~723K was caused by carbon deposition .


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