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<p>A series of supported Ni phosphide bifunctional hydroisomerization catalysts (Ni<sub>2</sub>P/ZSM-23/Al<sub>2</sub>O<sub>3</sub>) was synthesized by means of Ni hypophosphite reduction at different temperatures. The structure and morphology of Ni phosphide phase were determined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The surface chemical analysis was performed using X-ray photoelectron spectroscopy (XPS). The hydro/dehydrogenation and acid functions of catalysts were characterized by CO chemisorption, NH<sub>3</sub>-TPD and IR-spectroscopy of adsorbed pyridine (IR-Py). The reduction of supported precursor at the temperature lying in the range of 550–650 ⁰С resulted in high activity and iso-selectivity in n-decane conversion. The reduction of the supported component at 500 ⁰C or re-reduction of ex-situ reduced and passivated catalysts at 450 ⁰C led to the formation of impurities of other Ni phosphides such as NiP and Ni<sub>5</sub>P<sub>4</sub> and had a negative impact on n-decane conversion. Both the Brønsted acidity and Ni<sub>2</sub>P dispersion of the catalysts declined with increasing Ni<sub>2</sub>P content which were accompanied by a drop in their activity without loss of iso-selectivity.</p> Graphical Abstract <p></p>

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ZSM-23-Supported Nickel Phosphide Catalysts for n-Alkane Hydroisomerization

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • Tatyana S. Bogomolova,
  • Marina Yu. Smirnova,
  • Mikhail V. Parfenov,
  • Svetlana V. Cherepanova,
  • Maxim A. Panafidin,
  • Oleg V. Klimov,
  • Alexander S. Noskov

摘要

A series of supported Ni phosphide bifunctional hydroisomerization catalysts (Ni2P/ZSM-23/Al2O3) was synthesized by means of Ni hypophosphite reduction at different temperatures. The structure and morphology of Ni phosphide phase were determined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The surface chemical analysis was performed using X-ray photoelectron spectroscopy (XPS). The hydro/dehydrogenation and acid functions of catalysts were characterized by CO chemisorption, NH3-TPD and IR-spectroscopy of adsorbed pyridine (IR-Py). The reduction of supported precursor at the temperature lying in the range of 550–650 ⁰С resulted in high activity and iso-selectivity in n-decane conversion. The reduction of the supported component at 500 ⁰C or re-reduction of ex-situ reduced and passivated catalysts at 450 ⁰C led to the formation of impurities of other Ni phosphides such as NiP and Ni5P4 and had a negative impact on n-decane conversion. Both the Brønsted acidity and Ni2P dispersion of the catalysts declined with increasing Ni2P content which were accompanied by a drop in their activity without loss of iso-selectivity.

Graphical Abstract