Dry reforming of methane over calcium-deficient hydroxyapatite supported cobalt and nickel catalysts

• Published in: Chemical engineering science Vol. 228; pp. 115975 - 14/115975
• Main Authors: Tran, Thi Quynh, Pham Minh, Doan, Phan, Thanh Son, Pham, Quoc Nghi, Nguyen Xuan, Hoan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 31.12.2020; Elsevier
• Subjects: Cobalt; Dry reforming of methane; Engineering Sciences; Hydroxyapatite; Nickel; Supported catalyst; Syngas; Nickel; Hydroxyapatite; Dry reforming of methane; Cobalt; Supported catalyst; Syngas; syngas; nickel; hydroxyapatite; supported catalyst; cobalt
• ISSN: 0009-2509; 1873-4405
• DOI: 10.1016/j.ces.2020.115975

[Display omitted] •Hydroxyapatites (HAP) were successfully synthesized from different precursors.•Co/HAP catalysts were systematically more active than Ni/HAP catalysts.•No synergetic effect of bimetallic Ni-Co/HAP catalysts could be found.•Calcium-deficient HAP favors the catalytic stability of Co- and Ni-based catalysts. Calcium-deficient hydroxyapatite (HAP) non-porous supports were synthesized from Ca(NO3)2 and NH4H2PO4 (conventional synthesis route, HAP_N support) and from CaCO3 and H3PO4 (new synthesis route, HAP_C support) by wet chemical precipitation method. Monometallic and bimetallic supported catalysts were prepared by incipient wetness impregnation using Co(NO3)2 and Ni(NO3)2 salts. The size of Co- and Ni-based particles varied from some nm to dozens nm. Dry reforming of methane (DRM) tests at 700 °C, and 1.6 bar shows that HAP-supported cobalt catalysts were systematically more active than HAP-supported nickel catalysts, which is a new finding in DRM. Increasing the molar ratio of Ca/P from 1.43 (HAP_N) to 1.60 (HAP_C) support led to a slight decrease of the catalytic activity but an improvement of the catalytic stability. Thus, HAP_C support synthesized from CaCO3 and H3PO4 is a good candidate for designing an efficient catalyst for the DRM reaction.