Preparation of high-surface-area Ni/α-Al₂O₃ catalysts for improved CO methanation

TY - JOUR

T1 - Preparation of high-surface-area Ni/α-Al2O3 catalysts for improved CO methanation

AU - Liu, Youjun

AU - Gao, Jiajian

AU - Liu, Qing

AU - Gu, Fangna

AU - Lu, Xiaopeng

AU - Jia, Lihua

AU - Xu, Guangwen

AU - Zhong, Ziyi

AU - Su, Fabing

N1 - Publisher Copyright: © The Royal Society of Chemistry 2015.

PY - 2015

Y1 - 2015

N2 - We have developed a simple approach for the preparation of α-Al2O3 with a high surface area (AH) (about 44 m2 g-1) through deposition-precipitation of aluminum nitrate on a carbon black hard template. The AH support was impregnated with a Ni precursor to obtain the Ni/α-Al2O3 catalyst (Ni/AH-I). The above catalyst preparation method was further simplified by one-pot co-precipitation of the nickel and aluminum precursors on the carbon template to obtain the AH-supported Ni catalyst (Ni/AH-C). The samples were characterized by nitrogen adsorption, X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, H2 temperature-programmed reduction and H2 temperature-programmed desorption. The catalytic test results showed that the both Ni/AH-I and Ni/AH-C catalysts exhibited much more enhanced catalytic performance in syngas methanation than a Ni catalyst supported on low-surface-area α-Al2O3 at both atmospheric and high pressures, and at a weight hourly space velocity (WHSV) of 30 000 mL g-1 h-1, as well as a good stability in a 50 h high-pressure stability test at an extremely high WHSV of 120 000 mL g-1 h-1. The test of accelerated aging indicated that Ni/AH-C showed both better hydrothermal stability and stronger resistance to sintering. This work demonstrates AH can be prepared with high feasibility using carbon black as the hard template, and is suitable as a Ni catalyst support for CO methanation.

AB - We have developed a simple approach for the preparation of α-Al2O3 with a high surface area (AH) (about 44 m2 g-1) through deposition-precipitation of aluminum nitrate on a carbon black hard template. The AH support was impregnated with a Ni precursor to obtain the Ni/α-Al2O3 catalyst (Ni/AH-I). The above catalyst preparation method was further simplified by one-pot co-precipitation of the nickel and aluminum precursors on the carbon template to obtain the AH-supported Ni catalyst (Ni/AH-C). The samples were characterized by nitrogen adsorption, X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, H2 temperature-programmed reduction and H2 temperature-programmed desorption. The catalytic test results showed that the both Ni/AH-I and Ni/AH-C catalysts exhibited much more enhanced catalytic performance in syngas methanation than a Ni catalyst supported on low-surface-area α-Al2O3 at both atmospheric and high pressures, and at a weight hourly space velocity (WHSV) of 30 000 mL g-1 h-1, as well as a good stability in a 50 h high-pressure stability test at an extremely high WHSV of 120 000 mL g-1 h-1. The test of accelerated aging indicated that Ni/AH-C showed both better hydrothermal stability and stronger resistance to sintering. This work demonstrates AH can be prepared with high feasibility using carbon black as the hard template, and is suitable as a Ni catalyst support for CO methanation.

UR - http://www.scopus.com/inward/record.url?scp=84920811850&partnerID=8YFLogxK

U2 - 10.1039/c4ra13634a

DO - 10.1039/c4ra13634a

M3 - 文章

AN - SCOPUS:84920811850

SN - 2046-2069

VL - 5

SP - 7539

EP - 7546

JO - RSC Advances

JF - RSC Advances

IS - 10

ER -