Aqueous-phase reforming of glycerol for production of alkanes over Ni/CexZr1-xO2 nano-catalyst: Effects of the support’s composition

Highlights

10wt% Ni/Ce1−xZrxO2 of different x’s synthesized in a nanocrystalline structure.

Catalyst reactivity depended strongly upon the Ce/Zr ratio.

Ce/Zr ratio affected the active metal dispersion, BET surface area & particle size.

The 10wt% Ni/Ce0.3Zr0.7O2 determined to be the optimum prepared catalyst.

Optimum meant 99% C-content in gas product, 40%alkane selectivity & high stability.

Abstract

The aqueous phase reforming (APR) reaction of glycerol considered to be environmentally green. It converted polyols into value added products including; H2 and alkanes. Ni species known for its capability of producing alkane-rich gas under the APR process conditions might be utilized for this purpose. In this research, the conversion of glycerol into alkanes demonstrated using 10wt% Ni/CexZr1-xO2 (with x = 0, 0.3, 0.5, 0.7 and 1) catalysts. In order to better understand the behavior of these materials, they were evaluated physio-chemically through the; XRD, BET, H2-TPR, H2-Chemisorption and TEM analyses. Moreover; performances of the synthesized materials were determined through their reactivity. Results revealed that, this variable depended strongly upon the Ce/Zr ratio in turn affecting the active metal dispersion, BET surface area and particle size distribution of prepared species. Amongst catalysts prepared, an optimum one with composition of 10wt% Ni/Ce0.3Zr0.7O2 was pinpointed. This showed the highest carbon content in the gaseous product (99%), highest alkane selectivity (40%) as well as; a minimum of 25 h of stability. Ultimately, it was concluded that, the overall catalytic performance of the prepared materials lowered in the following order: Ni/Ce0.3Zr0.7O2 > Ni/Ce0.5Zr0.5O2 > Ni/Ce0.7Zr0.3O2 > Ni/ZrO2 > Ni/CeO2.

Graphical abstract

Keywords

  • Ni/CeO2–ZrO2;
  • Nano-catalyst;
  • Glycerol;
  • Aqueous phase reforming;
  • Renewable alkanes

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