The zeolite synthesis using waste as silicon source is a promising low-cost process. Sugarcane bagasse ash is a hazardous solid waste generated in large amounts in the sugar industry. Thus, development of new procedur...The zeolite synthesis using waste as silicon source is a promising low-cost process. Sugarcane bagasse ash is a hazardous solid waste generated in large amounts in the sugar industry. Thus, development of new procedures for its productive reuse is relevant. Therefore, this waste was used to prepare a new ZCNT （zeolite/carbon nanotube material）. In this work, ZCNT was applied in a CO2/CH4 separation. The adsorption took place at 303 K under pressure of 0.1 until 20 bar and the data were fitted by Langmuir, Toth and Freundlich equations. The adsorbed amount at 20 bar found was 4.7 mmol of CO2/g and 4.1 mmol of CH4/g; at 3 bar the adsorbed amount was 4.1 mmol of COJg and 1.2 mmol of CHa/g. This result indicates that ZCNT has potential application in COJCH4 separation at low pressures.展开更多
The kinetics of CO2 reforming of methane has been studied at 976－1033K on a commercial NiO/CaO/Al2O3 catalyst in a packed-bed continuous reactor. The reaction was carried out at atmospheric pressure and CO2/CH4 ratio...The kinetics of CO2 reforming of methane has been studied at 976－1033K on a commercial NiO/CaO/Al2O3 catalyst in a packed-bed continuous reactor. The reaction was carried out at atmospheric pressure and CO2/CH4 ratio ＞ 2. The Hougen-Watson rate models were fitted to experimental data assuming the disso ciative adsorption of methane as the rate-determining step. The reaction rate showed an effective reaction order of about unity for CH4. The apparent activity energy was found to be 104 kJ·mol-1. Therefore the kinetic reaction parameters were determined and a possible reaction mechanism was proposed.展开更多
The conversion of CO_(2) into value‐added chemicals and fuels via electrochemical methods paves a promising avenue to mitigate both energy and environmental crisis.Among all the carbonaceous products derived from CO_...The conversion of CO_(2) into value‐added chemicals and fuels via electrochemical methods paves a promising avenue to mitigate both energy and environmental crisis.Among all the carbonaceous products derived from CO_(2) electroreduction,CH_(4) is one of the most important carriers for chemical bond energy storage due to the highest value of mass heat.Herein,starting from the proposed reaction mechanisms reported previously,we summarized the recent progresses on CO_(2) electroreduction into CH_(4) from the perspective of catalyst design strategies including construction of subnanometer catalytic sites,modulation of interfaces,in‐situ structural evolution,and engineering of tandem catalysts.On the basis of both the previously theoretical predictions and experimental results,we aimed to gain insights into the reaction mechanism for the formation of CH_(4),which,in turn,would provide guidelines for the design of highly efficient catalysts.展开更多
文摘The zeolite synthesis using waste as silicon source is a promising low-cost process. Sugarcane bagasse ash is a hazardous solid waste generated in large amounts in the sugar industry. Thus, development of new procedures for its productive reuse is relevant. Therefore, this waste was used to prepare a new ZCNT （zeolite/carbon nanotube material）. In this work, ZCNT was applied in a CO2/CH4 separation. The adsorption took place at 303 K under pressure of 0.1 until 20 bar and the data were fitted by Langmuir, Toth and Freundlich equations. The adsorbed amount at 20 bar found was 4.7 mmol of CO2/g and 4.1 mmol of CH4/g; at 3 bar the adsorbed amount was 4.1 mmol of COJg and 1.2 mmol of CHa/g. This result indicates that ZCNT has potential application in COJCH4 separation at low pressures.
基金the Consejo Nacional de Investigacions Cientificas y Tecnicas (CONICET).
文摘The kinetics of CO2 reforming of methane has been studied at 976－1033K on a commercial NiO/CaO/Al2O3 catalyst in a packed-bed continuous reactor. The reaction was carried out at atmospheric pressure and CO2/CH4 ratio ＞ 2. The Hougen-Watson rate models were fitted to experimental data assuming the disso ciative adsorption of methane as the rate-determining step. The reaction rate showed an effective reaction order of about unity for CH4. The apparent activity energy was found to be 104 kJ·mol-1. Therefore the kinetic reaction parameters were determined and a possible reaction mechanism was proposed.
文摘The conversion of CO_(2) into value‐added chemicals and fuels via electrochemical methods paves a promising avenue to mitigate both energy and environmental crisis.Among all the carbonaceous products derived from CO_(2) electroreduction,CH_(4) is one of the most important carriers for chemical bond energy storage due to the highest value of mass heat.Herein,starting from the proposed reaction mechanisms reported previously,we summarized the recent progresses on CO_(2) electroreduction into CH_(4) from the perspective of catalyst design strategies including construction of subnanometer catalytic sites,modulation of interfaces,in‐situ structural evolution,and engineering of tandem catalysts.On the basis of both the previously theoretical predictions and experimental results,we aimed to gain insights into the reaction mechanism for the formation of CH_(4),which,in turn,would provide guidelines for the design of highly efficient catalysts.
