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Jeon OS, Lee H, Lee KS, Paidi VK, Ji Y, Kwon OC, Kim JP, Myung JH, Park SY, Yoo YJ, Lee JG, Lee SY, Shul YG. Harnessing Strong Metal-Support Interaction to Proliferate the Dry Reforming of Methane Performance by In Situ Reduction. ACS APPLIED MATERIALS & INTERFACES 2022; 14:12140-12148. [PMID: 35238550 DOI: 10.1021/acsami.1c20889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The strong bonding at the interface between the metal and the support, which can inhibit the undesirable aggregation of metal nanoparticles and carbon deposition from reforming of hydrocarbon, is well known as the classical strong metal-support interaction (SMSI). SMSI of nanocatalysts was significantly affected by heat treatment and reducing conditions during catalyst preparation.the heat treatment and reduction conditions during catalyst preparation. SMSI can be weakened by the decrement of metal-doped sites in the supporting oxide and can often deactivate catalysts by the encapsulation of active sites through these processes. To retain SMSI near the active sites and to enhance the catalytic activity of the nanocatalyst, it is essential to increase the number of surficial metal-doped sites between nanometal and the support. Herein, we propose a mild reduction process using dry methane (CH4/CO2) gas that suppresses the aggregation of nanoparticles and increases the exposed interface between the metal and support, Ni and cerium oxide. The effects of mild reduction on the chemical state of Ni-cerium oxide nanocatalysts were specifically investigated in this study. As a result, mild reduction led to form large amounts of the Ni3+ phase at the catalyst surface of which SMSI was significantly enhanced. It can be easily fabricated while the dry reforming of methane (DRM) reaction is on stream. The superior performance of the catalyst achieved a considerably high CH4 conversion rate of approximately 60% and stable operation up to 550 h at a low temperature, 600 °C.
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Affiliation(s)
- Ok Sung Jeon
- Department of Chemical and Bio-Molecular Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea
- Advanced Institutes of Convergence Technology, Seoul National University, Suwon 443-270, Republic of Korea
| | - Hyesung Lee
- Department of Chemical and Bio-Molecular Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea
| | - Kug-Seung Lee
- Pohang Accelerator Laboratory (PAL), Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea
| | - Vinod K Paidi
- Pohang Accelerator Laboratory (PAL), Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea
| | - Yunseong Ji
- Department of Chemical and Bio-Molecular Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea
- Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 31116, Republic of Korea
| | - Oh Chan Kwon
- Department of Chemical and Bio-Molecular Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea
| | - Jeong Pil Kim
- Department of Chemical and Bio-Molecular Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea
| | - Jae-Ha Myung
- Department of Materials Science and Engineering, Incheon National University, Incheon 22012, Republic of Korea
| | - Sang Yoon Park
- Advanced Institutes of Convergence Technology, Seoul National University, Suwon 443-270, Republic of Korea
| | - Young Joon Yoo
- Advanced Institutes of Convergence Technology, Seoul National University, Suwon 443-270, Republic of Korea
| | - Jin Goo Lee
- Advanced Energy Materials and Components R&D Group, Dongnam Division, Korea Institute of Industrial Technology, 33-1, Jungang-ro, Yangsan, Gyeongsangnam-do 50623, Republic of Korea
| | - Sang-Yup Lee
- Department of Chemical and Bio-Molecular Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea
| | - Yong Gun Shul
- Department of Chemical and Bio-Molecular Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea
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Rodriguez JA, Hanson JC, Frenkel AI, Kim JY, Pérez M. Experimental and theoretical studies on the reaction of H(2) with NiO: role of O vacancies and mechanism for oxide reduction. J Am Chem Soc 2002; 124:346-54. [PMID: 11782187 DOI: 10.1021/ja0121080] [Citation(s) in RCA: 120] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Reduction of an oxide in hydrogen is a method frequently employed in the preparation of active catalysts and electronic devices. Synchrotron-based time-resolved X-ray diffraction (XRD), X-ray absorption fine structure (NEXAFS/EXAFS), photoemission, and first-principles density-functional (DF) slab calculations were used to study the reaction of H(2) with nickel oxide. In experiments with a NiO(100) crystal and NiO powders, oxide reduction is observed at atmospheric pressures and elevated temperatures (250-350 degrees C), but only after an induction period. The results of in situ time-resolved XRD and NEXAFS/EXAFS show a direct NiO-->Ni transformation without accumulation of any intermediate phase. During the induction period, surface defect sites are created that provide a high efficiency for the dissociation of H(2). A perfect NiO(100) surface, the most common face of nickel oxide, exhibits a negligible reactivity toward H(2). The presence of O vacancies leads to an increase in the adsorption energy of H(2) and substantially lowers the energy barrier associated with the cleavage of the H-H bond. At the same time, adsorbed hydrogen can induce the migration of O vacancies from the bulk to the surface of the oxide. A correlation is observed between the concentration of vacancies in the NiO lattice and the rate of oxide reduction. These results illustrate the complex role played by O vacancies in the mechanism for reduction of an oxide. The kinetic models frequently used to explain the existence of an induction time during the reduction process can be important, but a more relevant aspect is the initial production of active sites for the rapid dissociation of H(2).
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Affiliation(s)
- José A Rodriguez
- Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973, USA.
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Zakharov II, Zhidomirov GM. Correlation energy in bonds. Development of a semiempirical scheme. The CNDO-CMP method. J STRUCT CHEM+ 1987. [DOI: 10.1007/bf00753994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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