ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Effect of preparation method on the activity of bimetallic Ni-Co/Al₂O₃ catalysts for dry reforming of methane

Gaukhar E. Ergazieva, Moldir M. Telbayeva, Anna N. Popova, Zinfer R. Ismagilov, Kusman Dossumov, Laura K. Myltykbayeva, Vadim G. Dodonov, Sergey A. Sozinov, and Almagul I. Niyazbayeva

The Institute of Combustion Problems, Almaty, Kazakhstan

E-mail: ergazieva_g@mail.ru

Received: 11 September 2020  Accepted: 13 January 2021

Abstract:

Ni-Co/γ-Al₂O₃ bimetallic catalysts were synthesized by capillary impregnation (CI) and solution combustion methods (SC). Catalysts tested in dry methane reforming (DRM), characterized by XRD, H₂-TPR, SEM, small-angle X-ray scattering. Preparation method plays an important role in regulating the textural and morphological properties of catalysts and provides a difference in indices of their activity. Synthesis of Ni-Co/γ-Al₂O₃ by SC in comparison with CI method leads to formation of solid solution of NiCo₂O₄ with a CSR size of 21 nm, increases the proportion of metal ions (Ni, Co) reduced at temperatures of 400–700 °C, uniform distribution of nanosized particles of active phase on carrier surface. At comparatively low reaction temperature (600 °C) on sample synthesized by SC, degree of methane conversion is higher compared to sample prepared by CI, X_CH4-69%, X_CH4-65%, respectively. SC provides an efficient way to develop an active catalyst for DRM at low temperatures (600–750 °C).

Keywords: Dry reforming of methane; Bimetallic catalyst; Solution combustion method

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01516-y

Chemical Papers 75 (6) 2765–2774 (2021)