Acta Physico-Chimica Sinica ›› 2019, Vol. 35 ›› Issue (6): 607-615.doi: 10.3866/PKU.WHXB201805054
• ARTICLE • Previous Articles Next Articles
Mengshui LIAN,Yali WANG,Mingquan ZHAO,Qianqian LI,Weizheng WENG,Wensheng XIA*(),Huilin WAN*(
)
Received:
2018-05-20
Accepted:
2018-06-20
Published:
2018-10-31
Contact:
Wensheng XIA,Huilin WAN
E-mail:wsxia@xmu.edu.cn;hlwan@xmu.edu.cn
Supported by:
MSC2000:
Mengshui LIAN,Yali WANG,Mingquan ZHAO,Qianqian LI,Weizheng WENG,Wensheng XIA,Huilin WAN. Stability of Ni/SiO2 in Partial Oxidation of Methane: Effects of W Modification[J].Acta Physico-Chimica Sinica, 2019, 35(6): 607-615.
Table 1
Specific surface areas (ABET), pore properties and the Ni/NiO particle size of samples before and after POM reaction."
Sample | ABET/(m2.g-1) | Volume/(cm3.g—1) | Aperture/nm | DXRD/nm | DTEM/nm | ||||
Fresh | Reduced | Used (10 h; 50 h) | Reduced | Used (10 h; 50 h) | |||||
SiO2 | 371.3 | 0.80 | 8.6 | - | - | - | - | - | |
9Ni/SiO2 | 327.6 | 0.67 | 7.8 | 26.9 | 39.7 | 56.5; - | 38.0 | 55.7; - | |
9NiW0.01/SiO2 | 311.3 | 0.65 | 7.7 | 24.7 | 36.6 | 46.6; - | 36.7 | 42.2; - | |
9NiW0.03/SiO2 | 304.4 | 0.66 | 7.7 | 17.3 | 32.7 | 38.8; - | 32.2 | 36.3; - | |
9NiW0.05/SiO2 | 296.0 | 0.61 | 7.2 | 11.0 | 30.9 | 35.1; - | 28.1 | 33.6; - | |
9NiW0.07/SiO2 | 285.9 | 0.57 | 6.9 | 9.3 | 18.7 | 19.9; 21.3 | 18.6 | 20.0; 21.0 | |
9NiW0.10/SiO2 | 276.2 | 0.58 | 7.0 | 9.9 | 22.1 | 22.7 a; - | 19.1 | 20.6 a; - |
Fig 5
TEM image and particle sizes distribution of the 9NiWx/SiO2 catalysts after POM reaction for 10 h. (a, a') 9Ni/SiO2; (b, b') 9NiW0.01/SiO2; (c, c') 9NiW0.03/SiO2; (d, d') 9NiW0.05/SiO2; (e, e') 9NiW0.07/SiO2; (f, f') 9NiW0.10/SiO2. ** As the 9NiW0.10/SiO2 catalyst quickly deactivated in POM, the data taken from the used in POM for 3 h."
Table 2
The binding energy in Ni 2p3/2 for the catalysts and an analysis on their surface Ni species."
Catalysts | Binding energy/eV | [Ni2+]/[Ni0] | |
Ni0 | Ni2+ | ||
9Ni/SiO2 | 852.4 | 855.6 | 0.25 |
9NiW0.07/SiO2 | 852.7 | 855.8 | 0.39 |
9NiW0.10/SiO2 | 853.0 | 856.2 | 0.59 |
9Ni/SiO2 used | 852.4 | 855.7 | 0.30 |
9NiW0.07/SiO2 used | 852.6 | 855.7 | 0.65 |
9NiW0.10/SiO2 used | 852.7 | 855.8 | 3.01 |
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