Journal
ACS CATALYSIS
Volume 11, Issue 4, Pages 2398-2411Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c04429
Keywords
methane dry reforming; coke resistance; surface oxygen; Pt-Ni cluster catalysts; DFT
Categories
Funding
- China Postdoctoral Science Foundation [2020M683241]
- Natural Science Foundation of Chongqing [cstc2020jcyjmsxmX0454]
- Fundamental Research Funds for the Central Universities [2020CDJ-LHZZ-049]
- Chongqing Special Postdoctoral Science Foundation [XmT2019008]
- National Natural Science Foundation of China [51976019]
- China Scholarship Council [201606050054]
- Department of Chemical Engineering in Norwegian University of Science and Technology, Norway
Ask authors/readers for more resources
By introducing Pt atoms into the surface of nickel catalysts, an enhanced active and stable Ni-based catalyst for methane dry reforming reaction was synthesized. The bimetallic Pt-Ni catalysts simultaneously enhance activity, increase H2/CO ratio, and improve stability by resisting carbon deposition. Density-functional theory calculations explained the higher coke resistance of Pt-Ni catalysts compared to monometallic samples.
By introducing Pt atoms into the surface of reduced hydrotalcite (HT)-derived nickel (Ni/HT) catalysts by redox reaction, we synthesized an enhanced active and stable Ni-based catalyst for methane dry reforming reaction. The bimetallic Pt-Ni catalysts can simultaneously enhance the catalyst activity, increase the H-2/CO ratio by suppressing reverse water-gas shift reaction, and enhance the stability by increasing the resistance to the carbon deposition during the reaction. Kinetic study showed that 1.0Pt-12Ni reduces the activation energy for CH4 dissociation and enhances the catalytic activity of the catalyst and lowers the energy barrier for CO2 activation and promotes the formation of surface O* by CO2 adsorptive dissociation. It is beneficial to enhance the resistance to the carbon deposition and prolong its service life in the reaction process. In addition, density-functional theory calculations rationalized the higher coke resistance of Pt-Ni catalysts where CH is more favorable to be oxidized instead of cracking into surface carbon on the Pt-Ni surface, compared with Ni(111) and Pt(111). Even if a small amount of carbon deposited on the Pt-Ni surface, its oxidation process requires a lower activation barrier. Thus, it demonstrates that the bimetallic Pt-Ni catalyst has the best ability to resist carbon deposition compared with monometallic samples.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available