Citation: ZHAO Jian, ZHOU Wei, MA Jian-Xin. Effect of CO₂ Pretreatment Operation Conditions on the Catalytic Performance and Structure of Ni-Co Bimetallic Catalyst[J]. Acta Physico-Chimica Sinica, ;2014, 30(7): 1325-1331. doi: 10.3866/PKU.WHXB201405042 shu

Effect of CO₂ Pretreatment Operation Conditions on the Catalytic Performance and Structure of Ni-Co Bimetallic Catalyst

ZHAO Jian ^1,2 ,
ZHOU Wei ^2,3 ,
MA Jian-Xin ^1,2,3,

1.
1. School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China;
2. Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, P. R. China;
3. School of Automotive Studies, Tongji University, Shanghai 201804, P. R. China

Received Date: 6 February 2014
Available Online: 4 May 2014
Fund Project:

The performance of the Ni-Co bimetallic catalyst was significantly improved by a novel H₂ and CO₂ (HCD) pretreatment in the dry reforming of methane compared with traditional H₂ pretreatment. The effects of the HCD pretreatment operating conditions, such as pretreatment time, temperature, gas feeding ratio, and gas flow rate, on the catalytic performance of Ni-Co bimetallic catalyst were investigated. The optimal pretreatment time, temperature, gas feeding ratio (CH₄/CO₂), and gas flow rate were 0.5-1 h, 780-800 ℃, 0:10, and 175-200 mL·min^-1, respectively. Biogas was simulated with CH₄ and CO₂ in a volume ratio of 1 and without any other diluted gas. The catalyst was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and thermogravimetry (TG) coupled to differential scanning calorimetry (DSC). In a 511 h stability test under the optimized operating conditions, the catalyst pretreated with both H₂ and CO₂ exhibited excellent stability. The average conversions of CH₄ and CO₂, selectivities for H₂ and CO, and volume ratio of H₂/CO were 96%, 97%, 98%, 99%, and 0.98, respectively. The average carbon deposition rate over the Ni-Co bimetallic catalyst was only about 0.2 mg·g^-1·h^-1. The characterization results revealed that the sintering speed of the metal greatly decreased with testing time, and the metal particle will not greatly sinter with further testing time. The amount of deposited carbon on the catalyst gradually decreased and growth of filamentous carbon over the surface of the catalyst could be inhibited. The performance of the Ni-Co bimetallic catalyst was significantly improved by a novel H₂ and CO₂ (HCD) pretreatment in the dry reforming of methane compared with traditional H₂ pretreatment. The effects of the HCD pretreatment operating conditions, such as pretreatment time, temperature, gas feeding ratio, and gas flow rate, on the catalytic performance of Ni-Co bimetallic catalyst were investigated. The optimal pretreatment time, temperature, gas feeding ratio (CH₄/CO₂), and gas flow rate were 0.5-1 h, 780-800 ℃, 0:10, and 175-200 mL·min^-1, respectively. Biogas was simulated with CH₄ and CO₂ in a volume ratio of 1 and without any other diluted gas. The catalyst was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and thermogravimetry (TG) coupled to differential scanning calorimetry (DSC). In a 511 h stability test under the optimized operating conditions, the catalyst pretreated with both H₂ and CO₂ exhibited excellent stability. The average conversions of CH₄ and CO₂, selectivities for H₂ and CO, and volume ratio of H₂/CO were 96%, 97%, 98%, 99%, and 0.98, respectively. The average carbon deposition rate over the Ni-Co bimetallic catalyst was only about 0.2 mg·g^-1·h^-1. The characterization results revealed that the sintering speed of the metal greatly decreased with testing time, and the metal particle will not greatly sinter with further testing time. The amount of deposited carbon on the catalyst gradually decreased and growth of filamentous carbon over the surface of the catalyst could be inhibited. Thereby, great catalytic activity and stability could be obtained during the dry reforming of methane reaction.
- Biogas reforming,
- Hydrogen production,
- Ni-Co catalyst,
- Pretreatment,
- Operation condition
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Effect of CO₂ Pretreatment Operation Conditions on the Catalytic Performance and Structure of Ni-Co Bimetallic Catalyst