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You searched for +publisher:"Universitat Rovira i Virgili" +contributor:("[email protected]"). One record found.

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Universitat Rovira i Virgili

1. Briceño Mejías, Kelly Cristina. Carbon molecular sieve membranes for gas separation.

Degree: Departament d'Enginyeria Química, 2012, Universitat Rovira i Virgili

Membrane separations are simple, energy efficient processes, which can be economically competitive with traditional separation technologies. In the case of gas separation both dense and porous materials have been developed for different application where hydrogen production is one of the most important niches of development. Hydrogen is being one of the most important vectors to develop alternative clean power generation sources. Nowadays, a lot of processes require the fabrication of pure hydrogen for efficiency and better performance. Different materials have been reported as gas separation membranes but still numerous problems related to stability, cost and fabrication must be overcome. The actual goal is to achieve materials that report good separation properties in new type of configuration facing industrial applications. Carbon molecular sieve membranes (CMSM) achieve high separation factors and permeance values than polymeric membranes. During the last 30 years they have gained importance due to their excellent performance as gas separation membranes. However, most research work has been focused on flat or hollow fiber configurations and minor attention has been done to supported CMSM. The main reason is due the difficulties associated to fabricate a defect free membrane using a highly reproducible fabrication method that allow to obtain a carbon layer after one polymer precursor coating step. In tubular configuration, these hybrid membranes are suitable for scaling up towards industrial applications, being more competitive than commercial unsupported hollow fiber membranes and films, especially under high pressure and temperature. The main objective of this work was to explore alternative fabrication methods for the fabrication of supported CMSM. In order to achieve this objective polyimide was coated over inorganic supports using two different approaches. The two methods reported in this thesis were spinning-coating and dip-coating. The idea of spinning¬coating was adapted from fabrication of supported carbon planar film. In this work it was developed the same idea coating TiO2 tubular supports under rotation with polyimide (Matrimid®). The thickness of the carbon membranes was controlled adjusting the viscosity of the polymeric solution, and after an exhaustive solvent i elimination it was possible to obtain a defect free carbon membrane. The influence of methanol washing, pyrolysis temperature (550-700ºC), and presence of the support allowed to extracting conclusions about the characteristics of the carbon material. Single gas permeance of H2, CO, CO2, N2, CH4 were obtained and ideal selectivity computed from this measurements indicated the presence of pinholes on the carbon membrane. However, the characterization of this carbon obtained after 550º and 700º C by adsorption-desorption analysis allowed to confirm the microporosity of the carbon layer. As an important contribution of this work the influence of the support as pore modifier of the carbon structure is presented after analysis of… Advisors/Committee Members: [email protected] (authoremail), true (authoremailshow), Garcia Valls, Ricard (director), Montané i Calaf, Daniel (codirector), true (authorsendemail).

Subjects/Keywords: carbon molecular sieve membranes; carbon membranes; gas separation membranes; hydrogen production; 62

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APA (6th Edition):

Briceño Mejías, K. C. (2012). Carbon molecular sieve membranes for gas separation. (Thesis). Universitat Rovira i Virgili. Retrieved from http://hdl.handle.net/10803/145378

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Briceño Mejías, Kelly Cristina. “Carbon molecular sieve membranes for gas separation.” 2012. Thesis, Universitat Rovira i Virgili. Accessed November 12, 2019. http://hdl.handle.net/10803/145378.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Briceño Mejías, Kelly Cristina. “Carbon molecular sieve membranes for gas separation.” 2012. Web. 12 Nov 2019.

Vancouver:

Briceño Mejías KC. Carbon molecular sieve membranes for gas separation. [Internet] [Thesis]. Universitat Rovira i Virgili; 2012. [cited 2019 Nov 12]. Available from: http://hdl.handle.net/10803/145378.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Briceño Mejías KC. Carbon molecular sieve membranes for gas separation. [Thesis]. Universitat Rovira i Virgili; 2012. Available from: http://hdl.handle.net/10803/145378

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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