Ceria promoted phosphate‐zirconia supported Ni catalyst for hydrogen rich syngas production through dry reforming of methane. (14th July 2021)

• Record Type: Journal Article
• Authors: Khatri, Jyoti; Fakeeha, Anis Hamza; Kasim, Samsudeen Olajide; Lanre, Mahmud S.; Abasaeed, Ahmed E.; Ibrahim, Ahmed Aidid; Kumar, Rawesh; Al‐Fatesh, Ahmed Sadeq
• Is Part Of: International journal of energy research. Volume 45:Number 13(2021)
• Page Start: 19289
• Page End: 19302
• Publication Date: 2021-07-14
• Subjects: ceria promotion -- DRM -- H2‐production -- phosphate‐zirconia supported Ni -- temperature programmed cyclic experiments; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.7026
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: Ceria promoted phosphate‐zirconia supported nickel catalyst (10Ni1Ce/PZr; x = 0, 1, 1.5, 2, 2.5, 3, 5 wt%) are prepared and characterized by XRD, SEM, SEM‐EDX, CH4 ‐TPSR, NH3 ‐TPD, cyclic H2 TPR‐CO2 TPD‐H2 TPR, and TPH. Ceria addition induces surface reducibility, exposes reduced phases of NiO and Ni2 P2 O7 as CH4 decomposition sites, and persuades additional CO2 adsorbed species as formate species over the catalyst surface. It also switches mobile oxygen in the lattice and thereafter oxide vacancy is replenished by oxygen from CO2 to a great extent. Altogether, 1 wt% ceria loading (10Ni1Ce/PZr) ensures more than 90% H2 yield (H2 /CO = 0.96) whereas 2 wt% ceria loading inputs constancy in catalytic performance up to 440 min TOS. Up to 3 wt% ceria loading, 97% hydrogen yield (H2 /CO ~1) is observed. Catalytic performance deteriorated above that 3 wt% ceria loading due to shading the catalytic active site or reoxidation of metallic nickel by excess ceria. Abstract : Ni/PZr catalyst has physiosorbed as well as chemisorbed carbonate/carboxylate species which claims more than 75% H2 yield. 3wt% ceria promotion in phosphate‐zirconia supported Nickel catalyst gives H2 yield up to 97% due to presence of additional mobile oxygen, nickel phosphate site and format species. H2 TPR‐CO2 TPD‐H2 TPR cycle experiment shows replenishment of "O' from CO2 to vacant lattice sites.