Effect of La₂O₃ Derived from Thai Monazite Ore Chemical Processing on the Properties of SO₄^-1/ZrO₂

Abstract:

La₂O₃ derived from Thai monazite ore chemical processing was used as a precursor to prepare SO₄^-1-1%La₂O₃/ZrO₂ solid acid catalyst. The SO₄^-1-1%La/ZrO₂ catalyst was synthesized by co-precipitation with subsequent impregnation method. Various characterization techniques such as X-ray diffraction (XRD), nitrogen adsorption-desorption (BET) and Fourier transform infrared spectroscopy (FTIR) were used to study crystalline structural, textural and acid properties of the prepared catalysts. XRD results revealed that the presence of stable La₂O₃/ZrO₂ tetragonal phase for SO₄^-1-1%La₂O₃/ZrO₂ was observed at calcined temperature up to 600 °C. No diffraction peaks of La₂O₃ appeared in the profile of SO₄^-1-1%La₂O₃/ZrO₂, indicated that the La₂O₃ was finely dispersed on the ZrO₂ support. The doping of SO₄^-1-ZrO₂ with La₂O₃ led to a significant decrease in its BET surface area, total pore volume and pore diameter. A relatively uniform pore size distribution of SO₄^-1-1%La₂O₃/ZrO₂ catalyst with average pore diameter of 6 nm was found at the calcined temperature of 600 °C. Lewis acid sites existed in the synthesized SO₄^-1-1%La₂O₃/ZrO₂ were lower than that counterpart. A loss of sulfate species was noted at high calcined temperature. The prepared SO₄^-1-1%La₂O₃/ZrO₂ will be further used as a solid catalyst for transesterification of waste cooking oil to biodiesel, and the addition of La₂O₃ on the support could lead to enhance the catalytic activity and thermal stability.

• Periodical: Key Engineering Materials (Volume 821)
• Pages: 195-200
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.821.195
• Online since: September 2019
• Authors: Sasikarn Nuchdang, Dussadee Rattanaphra*
• Keywords: Catalyst, La₂O₃, Monazite Ore, SO₄^-1/ZrO₂

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