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Holmium promoted yttria-zirconia supported Ni catalyst for H2 production via dry reforming of methane.

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Title: Holmium promoted yttria-zirconia supported Ni catalyst for H2 production via dry reforming of methane.
Authors: Fakeeha, Anis Hamza1,2 (AUTHOR), Patel, Rutu3 (AUTHOR), El Hassan, Nissrine4 (AUTHOR), Al-Zahrani, Salma A.5 (AUTHOR), Al-Awadi, Abdulrhman S.2 (AUTHOR), Frusteri, Leone6 (AUTHOR), Bayahia, Hossein7 (AUTHOR), Alharth, Abdulrahman I.8 (AUTHOR), Al-Fatesh, Ahmed Sadeq1 (AUTHOR) aalfatesh@ksu.edu.sa, Kumar, Rawesh1,9 (AUTHOR) kr.rawesh@gmail.com
Source: International Journal of Hydrogen Energy. Nov2022, Vol. 47 Issue 90, p38242-38257. 16p.
Subjects: Holmium, High resolution electron microscopy, Zirconium oxide, Yttria stabilized zirconium oxide, Catalysts, Carbon dioxide
Abstract: Herein, a series of 5NixHo/YZr (x = 1, 2, 3, 4, 5 wt%) materials, never reported before, were tested in DRM reaction and characterized using several techniques like Nitrogen physisorption, X-ray diffraction, UV–vis and RAMAN spectroscopies, High Resolution Transmission Electron Microscopy, H 2 -Temperature Programmed Reduction, CO 2 -Temperature Programmed De-adsorption and Thermogravimetry. The incorporation of Yttria in the structure modifies pore sizes and stabilizes cubic Zirconia phases, whereas the addition of Ho as a promotor brings stable cubic zirconia, stable cubic holmium zirconium oxide phase and a wide range of reducible NiO-interacted species. In particular, an optimum Ho loading of 4 wt%, characterized by a minimum bandgap, strong suppression of RWGS reaction and maximum amount of reducible NiO-interacted species allows to achieve 84.1% H 2 yield and 84.1% CO yield constantly over 420-min time on stream. The least basic sites availability over 5Ni5Ho/YZr results into inferior catalyst performance. [Display omitted] • 5NixHo/YZr (x = 0–5 wt%) materials is reported first time and found Highly affective in DRM. • 5Ni/YZr has rich basic profile but unstable monoclinic ZrO 2 phase which results into 44% H 2 -yield. • Ho presence nurtures stable cubic holmium zirconium oxide phase & wide range reducible NiO-species. • 5Ni4Ho/YZr catalyst is characterized by minimum bandgap & maximum reducible NiO-species. • 1 wt%Ho, 2 wt%Ho, 3 wt%Ho and 2 wt%Ho show 74.6%, 76%, 78.58% and 84.1% H 2 yield respectively. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Herein, a series of 5NixHo/YZr (x = 1, 2, 3, 4, 5 wt%) materials, never reported before, were tested in DRM reaction and characterized using several techniques like Nitrogen physisorption, X-ray diffraction, UV–vis and RAMAN spectroscopies, High Resolution Transmission Electron Microscopy, H 2 -Temperature Programmed Reduction, CO 2 -Temperature Programmed De-adsorption and Thermogravimetry. The incorporation of Yttria in the structure modifies pore sizes and stabilizes cubic Zirconia phases, whereas the addition of Ho as a promotor brings stable cubic zirconia, stable cubic holmium zirconium oxide phase and a wide range of reducible NiO-interacted species. In particular, an optimum Ho loading of 4 wt%, characterized by a minimum bandgap, strong suppression of RWGS reaction and maximum amount of reducible NiO-interacted species allows to achieve 84.1% H 2 yield and 84.1% CO yield constantly over 420-min time on stream. The least basic sites availability over 5Ni5Ho/YZr results into inferior catalyst performance. [Display omitted] • 5NixHo/YZr (x = 0–5 wt%) materials is reported first time and found Highly affective in DRM. • 5Ni/YZr has rich basic profile but unstable monoclinic ZrO 2 phase which results into 44% H 2 -yield. • Ho presence nurtures stable cubic holmium zirconium oxide phase & wide range reducible NiO-species. • 5Ni4Ho/YZr catalyst is characterized by minimum bandgap & maximum reducible NiO-species. • 1 wt%Ho, 2 wt%Ho, 3 wt%Ho and 2 wt%Ho show 74.6%, 76%, 78.58% and 84.1% H 2 yield respectively. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2022.09.029