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| Author(s): |
Luís Gustavo Ferroni Pereira
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Lorena. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de Lorena (EEL/ASDI) |
| Defense date: | 2018-02-02 |
| Examining board members: |
Ricardo Vieira;
Leonardo Baptista;
Luiz Claudio Antunes Bastos;
Turíbio Gomes Soares Neto;
Fernando Vernilli Junior
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| Advisor: | Ricardo Vieira |
| Abstract | |
This work aimed to develop catalytic materials based on cobalt and manganese spinels to be used as catalysts in the decomposition of 90% (mass) hydrogen peroxide, allowing multiple starts in a microthruster of monopropellant satellites. The catalysts were preliminarily evaluated in the spontaneous decomposition of H2O2 (drop test). This test allowed to select the materials that provide spontaneous and vigorous decomposition of H2O2, with a low induction time. Then, the best performing catalysts were evaluated in a fixed bed micro reactor, which allowed to determine the best composition and granulometry for the catalyst. After this, the materials were submitted to kinetic tests, where the order, the constant and the activation energy of the H2O2 decomposition reaction were determined. Finally, the catalyst called Co0,5Mn2,5-900, due its best performance, was tested in a 2 N microthruster, where it presented a fast and repetitive performance, being able to spontaneously decompose the H2O2 without suffer deactivation or fragmentation after the testes. All catalysts were characterized by Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES), Nitrogen Adsorption, CO Chemimetry, Helium Picnometry, X-ray Diffractometry, X-ray Photoelectron Spectroscopy and Mechanical Compression Resistance analysis aiming to correlate their physicochemical properties with their activity in the catalytic decomposition of concentrated hydrogen peroxide. (AU) | |
| FAPESP's process: | 14/22027-0 - Effect of manganese-doped cobalt spinels structures in the catalytic decomposition of hydrogen peroxide for use in satellite thrusters |
| Grantee: | Luís Gustavo Ferroni Pereira |
| Support Opportunities: | Scholarships in Brazil - Doctorate |