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123. Active states of Pd and Cu in carbon-supported Wacker-type catalysts for low-temperature CO oxidation

Author

Park, Eun Duck, Choi, Sun Hee, and Lee, Jae Sung

Subjects
Oxidation-reduction reaction -- Research, Chemicals, plastics and rubber industries
Abstract

Research into carbon-supported Wacker-type catalysts that show high activities in CO oxidation at ambient temperatures is presented. The active states of palladium and copper were a molecular Pd(II) species coordinated with chlorine ion and Cu(II) compounds.

Published
2000

148. Al2O3-Coated Ni/CeO2nanoparticles as coke-resistant catalyst for dry reforming of methaneElectronic supplementary information (ESI) available. See DOI: 10.1039/d0cy01615b

Author

Yang, Euiseob, Nam, Eonu, Lee, Jihyeon, Lee, Hojeong, Park, Eun Duck, Lim, Hankwon, and An, Kwangjin

Abstract

Nickel is considered an economically feasible catalyst for the dry reforming of methane (DRM) owing to its high activity. Because the highly endothermic DRM requires a high reaction temperature to activate both CH4and CO2, deactivation of the Ni catalyst may be induced by sintering and carbon coking. To mitigate catalyst deactivation, Ni/CeO2catalysts composed of monodisperse Ni nanoparticles supported on CeO2nanorods are designed and coated with Al2O3layers by atomic layer deposition (ALD). The performance of the catalyst in DRM and amount of carbon deposited are correlated with the thickness of the Al2O3layer in the Ni/CeO2/Al2O3catalysts. As the number of ALD cycles increases from 1 to 10, the conversion of CO2and CH4at 700 and 800 °C decreases, but the Ni/CeO2/Al2O3catalysts remain coke-free as thermogravimetric analysis shows no weight loss up to 800 °C. The Al2O3layer generated by ALD curtails the coking substantially, but the weakly metallic character of Ni and blocking of Ni sites by the Al2O3layer are the major factors contributing to decreasing the catalytic conversion. The ALD technique provides an efficient way to fabricate atomically controlled oxide layers for improving the stability of catalysts against coke deposition and sintering.

Published
2020
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149. CO and CO2 Methanation Over Ni/SiC and Ni/SiO2 Catalysts.

Author

Le, Thien An, Kang, Jong Kyu, and Park, Eun Duck

Subjects
METHANATION, CARBON monoxide, CARBON dioxide, NICKEL catalysts, CATALYTIC activity, SILICON carbide, SYNTHETIC natural gas, HEAT transfer
Abstract

Ni/SiC and Ni/SiO2 catalysts prepared by both wet impregnation (WI) and deposition-precipitation (DP) methods were compared for CO and CO2 methanation. The prepared catalysts were characterized using N2 physisorption, temperature-programmed reduction with H2 (H2-TPR), H2 chemisorption, pulsed CO2 chemisorption, temperature-programmed desorption of CO2 (CO2-TPD), transmission electron microscopy, and X-ray diffraction. H2-TPR analysis revealed that the catalysts prepared by DP exhibit stronger interaction between the nickel oxides and support than those prepared by WI. The former catalysts exhibit higher Ni dispersions than the latter. The catalytic activities for both reactions over Ni/SiC and Ni/SiO2 catalysts prepared by WI increase on increasing the Ni content from 10 to 20 wt%. The Ni/SiC catalyst prepared by DP shows higher catalytic activity for CO and CO2 methanation than that of the Ni/SiC catalyst prepared by WI. Furthermore, it exhibits the highest catalytic activity for CO methanation among the tested catalysts. The high Ni dispersion achieved by the DP method and the high thermal conductivity enabled by SiC are beneficial for both CO and CO2 methanation. [ABSTRACT FROM AUTHOR]

Published
2018
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