Da Silva T.C.,Federal University of Rio de Janeiro |
Pinto J.F.,Federal University of Rio de Janeiro |
Pinto J.F.,IBB Institute for Biotechnology And Bioengineering |
Santos F.M.,Federal University of Rio de Janeiro |
And 5 more authors.
Applied Catalysis B: Environmental | Year: 2015
The fluid catalytic cracking process is responsible for about 30% of CO2 emission in a petroleum refinery. The possibility to react CO2 and coke (Reverse-Boudouard reaction - RB) during the spent catalyst regeneration in the presence of CO2 and O2 atmosphere, instead of air, can simultaneously mitigate CO2 emission and produce CO for sequential uses. This goal was achieved by using an alumina modified by vanadium and potassium. Catalysts composed of alumina modified by Li, Na, K, Mg and Ca were investigated. The modified alumina catalysts were active for RB reaction in the following order, K>Mg, Li>Ca, Na>pristine alumina. Alumina modified by vanadium and potassium was also studied and revealed itself a remarkably active catalyst under O2 atmosphere, as well as for RB reaction. For instance, at 720°C 50% of CO2 was converted to CO, this value increases to 90% at 800°C. Finally, insights into RB reaction were provided performing this reaction in the presence of 13CO2. © 2014 Elsevier B.V.
Goncalves M.A.,National Institute of Metrology of Brazil |
Gonzaga F.B.,National Institute of Metrology of Brazil |
Fraga I.C.S.,National Institute of Metrology of Brazil |
Ribeiro C.M.,National Institute of Metrology of Brazil |
And 18 more authors.
Quimica Nova | Year: 2013
This work shows the results of a Proficiency Testing performed by a partnership between INMETRO and ANP. The performance of 49 Brazilian laboratories (using the z-score statistical test) in determining 10 quality parameters of ethanol fuel and biodiesel was evaluated. The certified reference values were provided by INMETRO, allowing a more rigorous assessment of the laboratories. For hydrous ethanol, the acidity parameter showed the lowest number of laboratories with satisfactory results (48%), while 85% of the laboratories presented satisfactory results for ethanol content. For biodiesel, the percentage of laboratories with satisfactory results ranged from 46% (kinematic viscosity) to 92% (acid number).