1,721,081 research outputs found
Catalizzatore multistrato, procedimento per la sua preparazione e suo uso per l’ossidazione parziale di idrocarburi in fase gassosa
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Solubility of Cis, Cis-muconic acid in various polar solvents from 298.15 K to 348.15 K
No full textThe present work concerns with an investigation on the solubility of cis,cis-muconic acid dissolution in different polar solvents by characterizing and modeling the dissolution as a function of temperature. Water, ethanol, 2-propanol and acetic acid have been investigated as solvents in the range temperatures from a 298.15 to 348.15 K. Owing to the absence of cis,cis-muconic acid solubility data, the molar fraction and temperature were correlated using the modified Apelblat equation model, which is applied for the mathematic fitting of experimental data. A total relative average deviation of 3.54% was obtained for the experimental results and the solubility data obtained with the model, thus attesting the adequacy for this study. The use of modified Apelblat equation also allowed to determine the molar enthalpy and molar entropy of dissolution. The dissolution of cis,cis-muconic acid in water, ethanol, 2-propanol and acetic acid, over temperatures ranging from 298.15 to 348.15 K, has been shown to be exothermi
Wet Air Oxidation of Industrial Lignin Case Study: Influence of the Dissolution Pretreatment and Perovskite-type Oxides
No full textSupported CuO/Ce1-xZrxO2 catalysts for the preferential oxidation of CO in H2-rich gases
No full textThermal Stability of Perovskite-Based Monolithic Reactors in the Catalytic Combustion of Methane
No full textSpontaneous Isothermal Oscillations in N<sub>2</sub>O Catalytic Decomposition: Fixed Bed Reactor Modelling
No full textTRANSIENT BEHAVIOUR OF PEROVSKITE-BASED MONOLITHIC REACTORS IN THE CATALYTIC COMBUSTION OF METHANE
No full textInsights on a methanation catalyst aging process: Aging characterization and kinetic study
Full text linkPower to gas systems is one of the most interesting long-term energy storage solutions. As a result of the high exothermicity of the CO2 methanation reaction, the catalyst in the methanation subsystem is subjected to thermal stress. Therefore, the performance of a commercial Ni/Al2O3 catalyst was investigated over a series of 100 hour-long tests and in-process relevant conditions, i.e. 5 bar from 270 to 500 °C. Different characterization techniques were employed to determine the mechanism of the observed performance loss (N2 physisorption, XRD, TPO). The TPO analysis excluded carbon deposition as a possible cause of catalyst aging. The BET analysis evidenced a severe reduction in the total surface area for the catalyst samples tested at higher temperatures. Furthermore, a direct correlation was found between the catalyst activity decline and the drop of the catalyst specific surface. In order to correctly design a reliable methanation reactor, it is essential to have a kinetic model that includes also the aging kinetics. For this purpose, the second set of experiments was carried out, in order to determine the intrinsic kinetics of the catalyst. The kinetic parameters were identified by using nonlinear regression analysis. Finally, a power-law aging model was proposed to consider the performance loss in time
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