clay and phosphine

The FeNi alloy nanoparticles (FeNi and BFeNi) supported on natural halloysite nanotubes (HNTs) were prepared for catalytic decomposition of toxic phosphine (PH₃) to yellow phosphorus and hydrogen. The Fourier transform infrared spectroscopy, X-ray diffraction, inductively coupled plasma, scanning electron microscope, and hydrogen temperature-programmed reduction tests were carried out to characterize the physicochemical properties of HNTs and the prepared nano-catalysts. Nearly 100% PH₃ was decomposed into yellow phosphorus and hydrogen at 420 °C with prepared FeNi/HNTs catalysts. Metallic Ni and Fe₃O₄ could be the catalytic active sites in FeNi/HNTs for PH₃ decomposition under the low temperature. The boron (B) additives decrease the catalytic activity of FeNi/HNTs for PH₃ decomposition due to the formation of the spinal NiFe₂O₄ and Fe₂B which replace the active Fe₃O₄ and metallic Ni in catalysts. The developed FeNi/HNTs are low-cost and effective catalysts for air-pollution control and recycle of the hazardous waste PH₃ gas in industry.

Topics: Alloys; Aluminum Silicates; Boron; Catalysis; Clay; Ferrosoferric Oxide; Gases; Hydrogen; Metal Nanoparticles; Nanotubes; Nickel; Phosphines; Phosphorus; Temperature