TY - JOUR
T1 - Enhanced investigation of CO methanation over Ni/Al 2O 3 catalysts for synthetic natural gas production
AU - Hu, Dacheng
AU - Gao, Jiajian
AU - Ping, Yuan
AU - Jia, Lihua
AU - Gunawan, Poernomo
AU - Zhong, Ziyi
AU - Xu, Guangwen
AU - Gu, Fangna
AU - Su, Fabing
PY - 2012/4/4
Y1 - 2012/4/4
N2 - CO methanation reaction over the Ni/Al 2O 3 catalysts for synthetic natural gas production was systematically investigated by tuning a number of parameters, including using different commercial Al 2O 3 supports and varying NiO and MgO loading, calcination temperature, space velocity, H 2/CO ratio, reaction pressure, and time, respectively. The catalytic performance was greatly influenced by the above-mentioned parameters. Briefly, a large surface area of the Al 2O 3 support, a moderate interaction between Ni and the support Al 2O 3, a proper Ni content (20 wt %), and a relatively low calcination temperature (400 °C) promoted the formation of small NiO particles and reducible β-type NiO species, which led to high catalytic activities and strong resistance to the carbon deposition, while addition of a small amount of MgO (2 wt %) could improve the catalyst stability by reducing the carbon deposition; other optimized conditions that enhanced the catalytic performance included high reaction pressure (3.0 MPa), high H 2/CO ratio (>3:1), low space velocity, and addition of quartz sand as the diluting agent in catalyst bed. The best catalyst combination was 20-40 wt % of NiO supported on a commercial Al 2O 3 (S 4) with addition of 2-4 wt % of MgO, calcined at 400-500 °C and run at a reaction pressure of 3.0 MPa. On this catalyst, 100% of CO conversion could be achieved within a wide range of reaction temperature (300-550 °C), and the CH 4 selectivity increased with increasing temperature and reached 96.5% at a relatively low temperature of 350 °C. These results will be very helpful to develop highly efficient Ni-based catalysts for the methanation reaction, to optimize the reaction process, and to better understand the above reaction.
AB - CO methanation reaction over the Ni/Al 2O 3 catalysts for synthetic natural gas production was systematically investigated by tuning a number of parameters, including using different commercial Al 2O 3 supports and varying NiO and MgO loading, calcination temperature, space velocity, H 2/CO ratio, reaction pressure, and time, respectively. The catalytic performance was greatly influenced by the above-mentioned parameters. Briefly, a large surface area of the Al 2O 3 support, a moderate interaction between Ni and the support Al 2O 3, a proper Ni content (20 wt %), and a relatively low calcination temperature (400 °C) promoted the formation of small NiO particles and reducible β-type NiO species, which led to high catalytic activities and strong resistance to the carbon deposition, while addition of a small amount of MgO (2 wt %) could improve the catalyst stability by reducing the carbon deposition; other optimized conditions that enhanced the catalytic performance included high reaction pressure (3.0 MPa), high H 2/CO ratio (>3:1), low space velocity, and addition of quartz sand as the diluting agent in catalyst bed. The best catalyst combination was 20-40 wt % of NiO supported on a commercial Al 2O 3 (S 4) with addition of 2-4 wt % of MgO, calcined at 400-500 °C and run at a reaction pressure of 3.0 MPa. On this catalyst, 100% of CO conversion could be achieved within a wide range of reaction temperature (300-550 °C), and the CH 4 selectivity increased with increasing temperature and reached 96.5% at a relatively low temperature of 350 °C. These results will be very helpful to develop highly efficient Ni-based catalysts for the methanation reaction, to optimize the reaction process, and to better understand the above reaction.
UR - http://www.scopus.com/inward/record.url?scp=84859466182&partnerID=8YFLogxK
U2 - 10.1021/ie300049f
DO - 10.1021/ie300049f
M3 - 文章
AN - SCOPUS:84859466182
SN - 0888-5885
VL - 51
SP - 4875
EP - 4886
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 13
ER -