The present work reports the synthesis and application of sulfur doped into porous activated carbon for removing elemental mercury from natural gas using a bench-scale fixed-bed reactor. A series of experiments were c...The present work reports the synthesis and application of sulfur doped into porous activated carbon for removing elemental mercury from natural gas using a bench-scale fixed-bed reactor. A series of experiments were carried out to investigate the optimization of Hg0 capture. Furthermore, our experimental results about optimum conditions to remove Hg0 were 1:10 of sulfur to activated carbon impregnation ratio, 350°C of impregnation temperature, and 3 hours of impregnation time. This research showed that the prepared adsorbents were capable to remove remarkable amount of Hg0 (23.615 mg/g) at high adsorption efficiency. This study may serve as reference on natural gas power plants for the removal of Hg0 using the same conditions.展开更多
Mercury, generally found in natural gas, is extremely hazardous. Although average mercury levels are relatively low, they are further reduced to comply with future mercury regulations,which are stringent in order to a...Mercury, generally found in natural gas, is extremely hazardous. Although average mercury levels are relatively low, they are further reduced to comply with future mercury regulations,which are stringent in order to avoid releasing to the environment. Herein, vapor mercury adsorption was therefore investigated using two kinds of supports, granular activated carbon（GAC） and titanium dioxide（Ti O2）. Both supports were impregnated by silver（5 and 15 wt.%）,before testing against a commercial adsorbent（sulfur-impregnated activated carbon, SAC）. The adsorption isotherm, kinetics, and its thermodynamics of mercury adsorption were reported.The results revealed that Langmuir isotherm provided a better fit to the experimental data.Pseudo second-order was applicable to describe adsorption kinetics. The higher uniform Ag dispersion was a key factor for the higher mercury uptake. Ti O2 supported silver adsorbent showed higher mercury adsorption than the commercial one by approximately 2 times.Chemisorption of mercury onto silver active sites was confirmed by an amalgam formation found in the spent adsorbents.展开更多
文摘The present work reports the synthesis and application of sulfur doped into porous activated carbon for removing elemental mercury from natural gas using a bench-scale fixed-bed reactor. A series of experiments were carried out to investigate the optimization of Hg0 capture. Furthermore, our experimental results about optimum conditions to remove Hg0 were 1:10 of sulfur to activated carbon impregnation ratio, 350°C of impregnation temperature, and 3 hours of impregnation time. This research showed that the prepared adsorbents were capable to remove remarkable amount of Hg0 (23.615 mg/g) at high adsorption efficiency. This study may serve as reference on natural gas power plants for the removal of Hg0 using the same conditions.
基金Petroleum Authority of Thailand (PTT) and Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program (Grant no. PHD/0371/2552) for their financial supports
文摘Mercury, generally found in natural gas, is extremely hazardous. Although average mercury levels are relatively low, they are further reduced to comply with future mercury regulations,which are stringent in order to avoid releasing to the environment. Herein, vapor mercury adsorption was therefore investigated using two kinds of supports, granular activated carbon（GAC） and titanium dioxide（Ti O2）. Both supports were impregnated by silver（5 and 15 wt.%）,before testing against a commercial adsorbent（sulfur-impregnated activated carbon, SAC）. The adsorption isotherm, kinetics, and its thermodynamics of mercury adsorption were reported.The results revealed that Langmuir isotherm provided a better fit to the experimental data.Pseudo second-order was applicable to describe adsorption kinetics. The higher uniform Ag dispersion was a key factor for the higher mercury uptake. Ti O2 supported silver adsorbent showed higher mercury adsorption than the commercial one by approximately 2 times.Chemisorption of mercury onto silver active sites was confirmed by an amalgam formation found in the spent adsorbents.
