TY - JOUR
T1 - Enhancing preferential oxidation of CO in H2 on Au/α-Fe2O3 catalyst via combination with APTES/SBA-15 CO2-sorbent
AU - Desmond Ng, Jia Wei
AU - Zhong, Ziyi
AU - Luo, Jizhong
AU - Borgna, Armando
N1 - Funding Information:
This research was supported by Agency for Science, Technology and Research in Singapore (A-STAR, Project code 0921380024 ). The authors would like to thank Ms. Jaclyn Teo for her kind assistance and Drs. P.K. Wong and Keith Carpenter for their support of this project.
PY - 2010/12
Y1 - 2010/12
N2 - Au/α-Fe2O3 was combined with a CO 2-sorbent (3-aminopropyltriethoxysilane (APTES) grafted on SBA-15 and hereafter denoted as APTES/SBA-15) to enhance preferential oxidation (PROX) of CO in H2. The CO2 molecules could be rapidly adsorbed on APTES/SBA-15 at low temperatures below 50 °C with a capacity of 0.68 mmol CO2/g-sample, and desorbed at a temperature range of 50 °C-80 °C. Three different configurations of the Au/α-Fe2O 3 catalyst and the CO2-sorbent were tested in the PROX reaction, namely (i) the sorbent-free (catalyst//SBA-15//catalyst) configuration, (ii) the packed three-layer configuration (catalyst//CO 2-sorbent//catalyst), and (iii) the mechanically mixed catalyst and CO2-sorbent configuration. Compared to configuration (i), configuration (ii) achieved an average 10% higher CO conversion at 50 °C and a GHSV of 65000 h-1. However, the CO concentration could not be lowered to below 70 ppm from 2000 ppm using configuration (ii) at a GHSV of 10000 h-1. Thus, a 5-layer configuration (catalyst//CO 2-sorbent//catalyst//CO2-sorbent//catalyst) was used, and the CO concentration was lowered to ca. 25 ppm. The mechanism for enhancement of the PROX reaction by the continuous removal of CO2 by the CO 2-sorbent is discussed and attributed to reduction of the surface carbonate on the Au/α-Fe2O3 catalyst formed during the PROX process.
AB - Au/α-Fe2O3 was combined with a CO 2-sorbent (3-aminopropyltriethoxysilane (APTES) grafted on SBA-15 and hereafter denoted as APTES/SBA-15) to enhance preferential oxidation (PROX) of CO in H2. The CO2 molecules could be rapidly adsorbed on APTES/SBA-15 at low temperatures below 50 °C with a capacity of 0.68 mmol CO2/g-sample, and desorbed at a temperature range of 50 °C-80 °C. Three different configurations of the Au/α-Fe2O 3 catalyst and the CO2-sorbent were tested in the PROX reaction, namely (i) the sorbent-free (catalyst//SBA-15//catalyst) configuration, (ii) the packed three-layer configuration (catalyst//CO 2-sorbent//catalyst), and (iii) the mechanically mixed catalyst and CO2-sorbent configuration. Compared to configuration (i), configuration (ii) achieved an average 10% higher CO conversion at 50 °C and a GHSV of 65000 h-1. However, the CO concentration could not be lowered to below 70 ppm from 2000 ppm using configuration (ii) at a GHSV of 10000 h-1. Thus, a 5-layer configuration (catalyst//CO 2-sorbent//catalyst//CO2-sorbent//catalyst) was used, and the CO concentration was lowered to ca. 25 ppm. The mechanism for enhancement of the PROX reaction by the continuous removal of CO2 by the CO 2-sorbent is discussed and attributed to reduction of the surface carbonate on the Au/α-Fe2O3 catalyst formed during the PROX process.
KW - CO-sorbent
KW - Functionalized SBA-15
KW - PROX reaction
KW - Supported Au catalysts
UR - http://www.scopus.com/inward/record.url?scp=78049468673&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2010.08.136
DO - 10.1016/j.ijhydene.2010.08.136
M3 - 文章
AN - SCOPUS:78049468673
VL - 35
SP - 12724
EP - 12732
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 23
ER -
