@InProceedings{OkamotoMascBuenViei:2015:DeCaMá,
               author = "Okamoto, Sayuri and Maschio, Leandro Jos{\'e} and Bueno, 
                         Jos{\'e} Maria Correa and Vieira, Ricardo",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal 
                         de S{\~a}o Carlos (UFSCar)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "Desenvolvimento de catalisadores m{\'a}ssicos para 
                         decomposi{\c{c}}{\~a}o do {\'o}xido nitroso para 
                         aplica{\c{c}}{\~o}es aeroespaciais",
                 year = "2015",
         organization = "Congresso Brasileiro de Cat{\'a}lise, 18.",
             keywords = "mixed oxides, bulk catalysts, N2O decomposition, thruster.",
             abstract = "Foram preparados catalisadores m{\'a}ssicos, {\`a} base de 
                         {\'o}xidos Co, Mn e Al, para decomposi{\c{c}}{\~a}o do 
                         {\'o}xido nitroso (N2O) para fins aeroespaciais a partir do 
                         m{\'e}todo da coprecipita{\c{c}}{\~a}o. Este m{\'e}todo 
                         consiste na coprecipita{\c{c}}{\~a}o de solu{\c{c}}{\~o}es de 
                         nitratos de Co, Mn e Al em solu{\c{c}}{\~a}o de K2CO3, a 25°C, 
                         mantendo o pH em 10 pela adi{\c{c}}{\~a}o de uma 
                         solu{\c{c}}{\~a}o de KOH. Foram preparadas diversas raz{\~o}es 
                         molares: 4Co1Mn1Al, 1Co4Mn1Al, 1Co2Mn, 2Co1Mn, 1Mn2Al e 1Co2Al. 
                         Estes {\'o}xidos foram extrusados, calcinados a 900°C e 
                         caracterizados por Adsor{\c{c}}{\~a}o de Nitrog{\^e}nio, 
                         Quimissor{\c{c}}{\~a}o de CO, Termogravimetria, Difratometria de 
                         Raios-X e por Espectroscopia de Fotoel{\'e}trons Excitados por 
                         Raios-X (XPS). Inicialmente foram efetuados testes 
                         catal{\'{\i}}ticos em um reator de leito fixo para 
                         avalia{\c{c}}{\~a}o da atividade dos catalisadores na 
                         temperatura de igni{\c{c}}{\~a}o da rea{\c{c}}{\~a}o de 
                         decomposi{\c{c}}{\~a}o do N2O. Em seguida foram executados 
                         testes em um propulsor de 2 N, empregando o catalisador com melhor 
                         desempenho nos testes catal{\'{\i}}ticos (4Co1Mn1Al), para 
                         verificar o performance do material, comparando com os valores 
                         te{\'o}ricos. Foi, ainda, realizado um teste comparativo de 
                         desempenho com o catalisador 5% Rh2O3/Al2O3, tradicionalmente 
                         usado na decomposi{\c{c}}{\~a}o do N2O. ABSTRACT: Cobalt, 
                         manganese and aluminum oxide-based bulk catalysts were prepared by 
                         the coprecipitation method for decomposition of nitrous oxide 
                         (N2O) for aerospace applications. Nitrates solutions of cobalt, 
                         manganese, and aluminum were coprecipitated in a K2CO3 solution at 
                         25°C, with pH maintained at 10 by adding a KOH solution. Several 
                         oxides (4Co1Mn1Al, 1Co4Mn1Al, 1Co2Mn, 2Co1Mn, 1Mn2Al, 1Co2Al) were 
                         prepared, extruded and calcined at 900°C. These materials were 
                         characterized by N2 Adsorption, CO Chemisorption, 
                         Thermogravimetry, X-Ray Diffraction, and X-ray Excited 
                         Photoelectron Spectroscopy (XPS). The catalytic tests were first 
                         performed in a fixed bed reactor in order to evaluate the 
                         catalytic activity around the N2O decomposition temperature. 
                         Afterwards, tests on a 2 N thruster were carried out with the 
                         catalyst that has shown the best performance in the fixed bed 
                         reactor (4Co1Mn1Al) and the experimental results were compared to 
                         theoretical values. In addition, the performance of the bulk 
                         catalyst was compared to the conventional catalyst (5% 
                         Rh2O3/Al2O3) for N2O decomposition.",
  conference-location = "Porto Seguro, BA",
      conference-year = "13-17 set.",
        urlaccessdate = "27 abr. 2024"
}