Two-Dimensional Model for Oxidative Coupling of Methane in a Packed-Bed Membrane Reactor

2012 ◽  
Vol 35 (2) ◽  
pp. 294-301 ◽  
Author(s):  
N. Holst ◽  
S. Jašo ◽  
H. R. Godini ◽  
S. Glöser ◽  
H. Arellano-Garcia ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Membrane Reactor ◽  
Packed Bed ◽  
Oxidative Coupling Of Methane ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model

scholarly journals Experimental Investigation of the Oxidative Coupling of Methane in a Porous Membrane Reactor: Relevance of Back-Permeation

Membranes ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 152 ◽  
Author(s):  
Aitor Cruellas ◽  
Wout Ververs ◽  
Martin van Sint Annaland ◽  
Fausto Gallucci
Keyword(s):  
Oxidative Coupling ◽  
Membrane Reactor ◽  
Effective Diffusion ◽  
Packed Bed ◽  
Porous Membrane ◽  
Oxidative Coupling Of Methane ◽  
Membrane Reactors ◽  
Packed Bed Reactor ◽  
Membrane Properties ◽  
Beneficial Effects

Novel reactor configurations for the oxidative coupling of methane (OCM), and in particular membrane reactors, contribute toward reaching the yield required to make the process competitive at the industrial scale. Therefore, in this work, the conventional OCM packed bed reactor using a Mn-Na2WO4/SiO2 catalyst was experimentally compared with a membrane reactor, in which a symmetric MgO porous membrane was integrated. The beneficial effects of distributive feeding of oxygen along the membrane, which is the main advantage of the porous membrane reactor, were demonstrated, although no significant differences in terms of performance were observed because of the adverse effects of back-permeation prevailing in the experiments. A sensitivity analysis carried out on the effective diffusion coefficient also indicated the necessity of properly tuning the membrane properties to achieve the expected promising results, highlighting how this tuning could be addressed.

scholarly journals Two-Dimensional Mathematical Modeling of the Oxidative Coupling of Methane in a Membrane Reactor

2016 ◽  
Vol 20 (1) ◽  
pp. 17-33 ◽  
Author(s):  
Wisitsree Wiyaratn ◽  
Salamah Manundawee ◽  
Amornchai Arpornwichanop ◽  
Suttichai Assabumrungrat ◽  
Anucha Watanapa ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Oxidative Coupling ◽  
Membrane Reactor ◽  
Oxidative Coupling Of Methane ◽  
Two Dimensional

scholarly journals Applying CFD for Studying the Dynamic and Thermal Behavior of an Indirect Solar Dryer: Paramertric Analysis

2020 ◽  
Vol 22 (1) ◽  
pp. 253-272
Author(s):  
S. Khaldi ◽  
A. N. Korti ◽  
S. Abboudi
Keyword(s):  
Operating Time ◽  
Packed Bed ◽  
Climatic Conditions ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Air Inlet ◽  
Solar Dryer ◽  
Two Dimensional Model ◽  
Turbulent Airflow ◽  
Typical Day

AbstractIn this work, an indirect solar dryer integrated thermal storage for drying figs. (Ficuscarica) is studied numerically. Unsteady turbulent airflow and heat transfer through a two-dimensional model is carried out for a typical day of August under the climatic conditions of Tlemcen (Algeria). Effects of air inlet size and thickness of the packed bed on the dynamic and thermal behaviors of the dryer with and without packed bed have been discussed. The study shows that: (1) Increase the inlet size from 0.04 m to 0.10 m can accelerate the extraction of air by about 13% and reduce the maximum crops temperature by about 14%. (2) The packed bed can reduce the mass flow rate extracted by 22% and the fluctuations of air temperature by 1.3%. (3) A packed bed with a thickness of 0.15 m can extend the operating time of the dryer up to 23%.

scholarly journals Design of a Packed Bed Membrane Reactor for the Oxidative Coupling of Methane

2012 ◽  
Vol 44 ◽  
pp. 1724-1725
Author(s):  
A.S. Chaudhari ◽  
J.J.F.E. Ramakers ◽  
F. Gallucci ◽  
M. van Sint Annaland
Keyword(s):  
Oxidative Coupling ◽  
Membrane Reactor ◽  
Packed Bed ◽  
Oxidative Coupling Of Methane

Commitment to pro- versus counter-attitudinal behavior and the dynamics of social representations

2002 ◽  
Vol 61 (1) ◽  
pp. 34-44 ◽  
Author(s):  
Eric Tafani ◽  
Lionel Souchet
Keyword(s):  
Higher Education ◽  
Social Representations ◽  
Cognitive Restructuring ◽  
Social Representation ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Social Actions ◽  
The Social ◽  
Two Dimensional Model ◽  
Students Attitudes

This research uses the counter-attitudinal essay paradigm ( Janis & King, 1954 ) to test the effects of social actions on social representations. Thus, students wrote either a pro- or a counter-attitudinal essay on Higher Education. Three forms of counter-attitudinal essays were manipulated countering respectively a) students’ attitudes towards higher education; b) peripheral beliefs or c) central beliefs associated with this representation object. After writing the essay, students expressed their attitudes towards higher education and evaluated different beliefs associated with it. The structural status of these beliefs was also assessed by a “calling into question” test ( Flament, 1994a ). Results show that behavior challenging either an attitude or peripheral beliefs induces a rationalization process, giving rise to minor modifications of the representational field. These modifications are only on the social evaluative dimension of the social representation. On the other hand, when the behavior challenges central beliefs, the same rationalization process induces a cognitive restructuring of the representational field, i.e., a structural change in the representation. These results and their implications for the experimental study of representational dynamics are discussed with regard to the two-dimensional model of social representations ( Moliner, 1994 ) and rationalization theory ( Beauvois & Joule, 1996 ).

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