Preparation mechanism and hydrodenitrogenation performance of nickel phosphide catalyst
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Graphical Abstract
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Abstract
Thermal decomposition of nickel hypophosphite precursor into nickel phosphide (Ni2P) was studied using thermogravimetry-mass spectrometry analysis. The results indicated that nickel ion (Ni2+) influenced the decomposition pathway of hypophosphite, because it might catalyze the reaction of hypophosphite to produce PH3 at lower temperature. Silica-supported Ni2P catalysts with different loadings were prepared and characterized using X-ray diffraction, N2 adsorption-desorption, and high resolution transmission electron microscopy. It was indicated that Ni2P was well dispersed on the support with a particle size of 5~8 nm. The catalytic performance of as-prepared catalysts was evaluated in a fixed-bed reactor for hydrodenitrogenation of quinoline. Under the reaction temperature of 360℃, hydrogen pressure of 2.0 MPa, LHSV of 2.0 h-1, and H2/oil volume ratio of 500:1, the conversion of quinoline over Ni2P(20%)/SiO2 catalyst reached 41.5%.
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