Concentration-Dependent Solar Thermochemical CO 2 /H 2 O Splitting Performance by Vanadia–Ceria Multiphase Metal Oxide Systems | Zendy

Asim Riaz | Zendy; Muhammad Umair Ali | Zendy; T. Gabriel Enge | Zendy; Takuya Tsuzuki | Zendy; Adrian Lowe | Zendy; Wojciech Lipiński | Zendy

Open Access

Concentration-Dependent Solar Thermochemical CO ₂ /H ₂ O Splitting Performance by Vanadia–Ceria Multiphase Metal Oxide Systems

Author(s) -

Asim Riaz,

Muhammad Umair Ali,

T. Gabriel Enge,

Takuya Tsuzuki,

Adrian Lowe,

Wojciech Lipiński

Publication year - 2020

Publication title -

research

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.8

H-Index - 16

ISSN - 2639-5274

DOI - 10.34133/2020/3049534

Subject(s) - syngas , oxide , redox , methane , partial oxidation , oxygen , yield (engineering) , oxygen storage , metal , materials science , cerium oxide , inorganic chemistry , chemistry , chemical engineering , catalysis , metallurgy , biochemistry , organic chemistry , engineering

The effects of V and Ce concentrations (each varying in the 0–100% range) in vanadia–ceria multiphase systems are investigated for synthesis gas production via thermochemical redox cycles of CO 2 and H 2 O splitting coupled to methane partial oxidation reactions. The oxidation of prepared oxygen carriers is performed by separate and sequential CO 2 and H 2 O splitting reactions. Structural and chemical analyses of the mixed-metal oxides revealed important information about the Ce and V interactions affecting their crystal phases and redox characteristics. Pure CeO 2 and pure V 2 O 5 are found to offer the lowest and highest oxygen exchange capacities and syngas production performance, respectively. The mixed-oxide systems provide a balanced performance: their oxygen exchange capacity is up to 5 times higher than that of pure CeO 2 while decreasing the extent of methane cracking. The addition of 25% V to CeO 2 results in an optimum mixture of CeO 2 and CeVO 4 for enhanced CO 2 and H 2 O splitting. At higher V concentrations, cyclic carbide formation and oxidation result in a syngas yield higher than that for pure CeO 2 .

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