Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5146377 | International Journal of Hydrogen Energy | 2017 | 13 Pages |
Abstract
Catalytic supercritical water gasification (SCWG) of glucose over Ni/Zr(Ce,Y)O2-δ catalysts was conducted in a batch reactor at 500 °C, 23-24 MPa with 10 wt.% feed concentration. The catalysts were prepared by carbonate co-precipitation method and the effects of nickel molar content and CeO2 loading on gasification performances were investigated. The catalytic gasification experiments with Nix/Zr0.8Y0.2O2-δ (x = 0.1, 0.2, 0.3, 0.5, 0.7) (NZY) catalysts showed that carbon gasification efficiency increased gradually with the increase of nickel content, but hydrogen yield gradually increased then leveled off. The maximum hydrogen yield of 22 mol kgâ1, about 10 times of that without catalyst, was obtained with Ni0.5/Zr0.8Y0.2O2-δ (NZY582) catalyst, and carbon gasification efficiency and total gasification efficiency were 66% and 90%, respectively. In order to achieve higher gasification efficiency, the Zr(Y)O2-δ support was modified by adding CeO2. The results showed that using Ni0.5/Zr0.4Ce0.4Y0.2O2-δ (NZCY5442) catalyst, carbon gasification efficiency reached 76%, about 15% higher than that of NZY582 catalyst, and methane yield increased by 1.9 times, while hydrogen yield decreased by 23%. Various characterization techniques were carried out on the reduced and used catalysts and it was found that the catalysts exhibited excellent hydrothermal stability and good anti-carbon deposition capability.
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Authors
Jianbing Huang, Xiaoyan Lian, Li Wang, Chao Zhu, Hui Jin, Runyu Wang,