LFG(Land-Fill Gas), which is leached from land-fill sites, includes components of CH4, CO2, O2, N2, and water (vapor). The preparation of synthesis gas from LFG as a DME(Di Methyl Ether) feedstock was studied by methane reforming reactions of CO2, O2, and steam over NiO-MgO-CeO2/Al2O3 catalyst. Our ...
LFG(Land-Fill Gas), which is leached from land-fill sites, includes components of CH4, CO2, O2, N2, and water (vapor). The preparation of synthesis gas from LFG as a DME(Di Methyl Ether) feedstock was studied by methane reforming reactions of CO2, O2, and steam over NiO-MgO-CeO2/Al2O3 catalyst. Our experiments were performed to investigate the effects of methane conversion and synthesis gas ratio on the amounts of LFG components over NiO-MgO-CeO2/Al2O3 catalyst. Results were obtained through the activity reaction (kinetics) experiments at the temperature of 900℃ and GHSV of 4,000.
The results were as following: it has generally shown that methane gas conversion rate increased with the increase of oxygen and carbon dioxide amounts. Highly methane conversion of 92~93% and synthesis gas ratio of approximately 1.0 were obtained in the feed of gas composition flow-rate of 243 ㎖/min of CH4, 241 ㎖/min of CO2, 195 ㎖/min of O2, 48 ㎖/min of N2, and 360 ㎖/min of water, respectively. under reactor pressure of 15 bars for 50 hrs of reaction time. Also, it was shown that catalyst deactivation by coke formation was reduced excessively adding oxygen and steam as an oxidizer of methane reforming.
Under the range of 8~15 bar of reactor pressure, the conversion of methane with composition of CH4:CO2:H2O = 1:1:1.5 mole ratio was more than 95% and then optimal mole ratio of synthesis gas was observed to be around 1.0. For the effects of oxygen, with the increase of oxygen amount, methane conversion also was increased, however, there were no effects on synthesis gas mole ratio. For the effects of nitrogen, there were no effects on methane conversion as well as synthesis gas ratio. Methane conversion rate was increased with the increase of carbon dioxide amount, however, synthesis gas mole ratio was equally decreased to 1.0 with composition of CH4:CO2 = 1:1.
As the reaction pressure increases, methane conversion and synthesis gas mole ratio also were shown to increase and in particular, methane conversion rapidly was lowered at 16 bars.
In this study, the preparations of synthesis gas with the mixture of gases leached out of land-fill sites were performed by catalytic reforming reactions. Because the compositions of real gases from land-fill sites change with time duration of land-fill, it was not easy to investigate effects of each gas (CH4, CO2, O2, H2O ...) on mole ratio of synthesis gas. For the further study, it would be expected to focus on the feasibility researches on the reaction conversion to DME(Di Methyl Ether) product.
LFG(Land-Fill Gas), which is leached from land-fill sites, includes components of CH4, CO2, O2, N2, and water (vapor). The preparation of synthesis gas from LFG as a DME(Di Methyl Ether) feedstock was studied by methane reforming reactions of CO2, O2, and steam over NiO-MgO-CeO2/Al2O3 catalyst. Our experiments were performed to investigate the effects of methane conversion and synthesis gas ratio on the amounts of LFG components over NiO-MgO-CeO2/Al2O3 catalyst. Results were obtained through the activity reaction (kinetics) experiments at the temperature of 900℃ and GHSV of 4,000.
The results were as following: it has generally shown that methane gas conversion rate increased with the increase of oxygen and carbon dioxide amounts. Highly methane conversion of 92~93% and synthesis gas ratio of approximately 1.0 were obtained in the feed of gas composition flow-rate of 243 ㎖/min of CH4, 241 ㎖/min of CO2, 195 ㎖/min of O2, 48 ㎖/min of N2, and 360 ㎖/min of water, respectively. under reactor pressure of 15 bars for 50 hrs of reaction time. Also, it was shown that catalyst deactivation by coke formation was reduced excessively adding oxygen and steam as an oxidizer of methane reforming.
Under the range of 8~15 bar of reactor pressure, the conversion of methane with composition of CH4:CO2:H2O = 1:1:1.5 mole ratio was more than 95% and then optimal mole ratio of synthesis gas was observed to be around 1.0. For the effects of oxygen, with the increase of oxygen amount, methane conversion also was increased, however, there were no effects on synthesis gas mole ratio. For the effects of nitrogen, there were no effects on methane conversion as well as synthesis gas ratio. Methane conversion rate was increased with the increase of carbon dioxide amount, however, synthesis gas mole ratio was equally decreased to 1.0 with composition of CH4:CO2 = 1:1.
As the reaction pressure increases, methane conversion and synthesis gas mole ratio also were shown to increase and in particular, methane conversion rapidly was lowered at 16 bars.
In this study, the preparations of synthesis gas with the mixture of gases leached out of land-fill sites were performed by catalytic reforming reactions. Because the compositions of real gases from land-fill sites change with time duration of land-fill, it was not easy to investigate effects of each gas (CH4, CO2, O2, H2O ...) on mole ratio of synthesis gas. For the further study, it would be expected to focus on the feasibility researches on the reaction conversion to DME(Di Methyl Ether) product.
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