TY - JOUR
T1 - Ni-modified Mo 2C catalysts for methane dry reforming
AU - Shi, Chuan
AU - Zhang, Anjie
AU - Li, Xiaosong
AU - Zhang, Shaohua
AU - Zhu, Aimin
AU - Ma, Yufei
AU - Au, Chaktong
N1 - Funding Information:
The work was supported by the National Natural Science Foundation of China (Nos. 20573014 and 21073024 ), Natural Science Foundation of Liaoning Province (No. 201102034) and by the Program for New Century Excellent Talents in University ( NCET-07-0136 ), as well as by the Fundamental Research Funds for the Central Universities (No. DUT12LK23).
PY - 2012/7/26
Y1 - 2012/7/26
N2 - Dry reforming of methane with CO 2 (DRM) was studied over Ni-Mo 2C catalysts with Ni/Mo molar ratios of 1/3, 1/2, and 1/1 (denoted as Ni-Mo 2C (1/3), Ni-Mo 2C (1/2), and Ni-Mo 2C (1/1), respectively) aiming to investigate the catalytic roles of Ni and the carbide. The results of XRD and XPS characterizations indicated that the carbonization process was promoted by the presence of Ni. The CH 4-TPR and CO 2-TPO over the fresh samples proved that CH 4 dissociation was greatly enhanced by Ni. The Ni-Mo 2C (1/2) catalyst showed the best catalytic activity and stability for CH 4/CO 2 (1/1) dry reforming. Above 80% of CH 4 and CO 2 conversions were maintained at 800 °C during a test run of 20 h at W/F = 0.3 g s cm -3. Characterizations of the spent samples revealed that the deactivation of Ni-Mo 2C (1/1) was due to coke formation whereas that of Ni-Mo 2C (1/3) was due to bulk oxidation of Mo 2C into MoO 2. Only at a Ni/Mo molar ratio of 1/2, a catalytic oxidation-reduction cycle could be established. It was suggested that Ni-Mo 2C was a typical bi-functional catalyst. In CH 4/CO 2 dry reforming, the dissociation of CH 4 was catalyzed by Ni, while the activation of CO 2 took place on Mo 2C. By regulating the molar ratio of Ni and Mo 2C, a catalytic redox cycle could be established.
AB - Dry reforming of methane with CO 2 (DRM) was studied over Ni-Mo 2C catalysts with Ni/Mo molar ratios of 1/3, 1/2, and 1/1 (denoted as Ni-Mo 2C (1/3), Ni-Mo 2C (1/2), and Ni-Mo 2C (1/1), respectively) aiming to investigate the catalytic roles of Ni and the carbide. The results of XRD and XPS characterizations indicated that the carbonization process was promoted by the presence of Ni. The CH 4-TPR and CO 2-TPO over the fresh samples proved that CH 4 dissociation was greatly enhanced by Ni. The Ni-Mo 2C (1/2) catalyst showed the best catalytic activity and stability for CH 4/CO 2 (1/1) dry reforming. Above 80% of CH 4 and CO 2 conversions were maintained at 800 °C during a test run of 20 h at W/F = 0.3 g s cm -3. Characterizations of the spent samples revealed that the deactivation of Ni-Mo 2C (1/1) was due to coke formation whereas that of Ni-Mo 2C (1/3) was due to bulk oxidation of Mo 2C into MoO 2. Only at a Ni/Mo molar ratio of 1/2, a catalytic oxidation-reduction cycle could be established. It was suggested that Ni-Mo 2C was a typical bi-functional catalyst. In CH 4/CO 2 dry reforming, the dissociation of CH 4 was catalyzed by Ni, while the activation of CO 2 took place on Mo 2C. By regulating the molar ratio of Ni and Mo 2C, a catalytic redox cycle could be established.
KW - Carbon dioxide
KW - Dry reforming
KW - Methane
KW - Molybdenum carbide
KW - Nickel
UR - http://www.scopus.com/inward/record.url?scp=84861861006&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2012.04.035
DO - 10.1016/j.apcata.2012.04.035
M3 - Journal article
AN - SCOPUS:84861861006
SN - 0926-860X
VL - 431-432
SP - 164
EP - 170
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
ER -