Hydrodeoxygenation-Isomerization of Methyl Palmitate over SAPO-11-Supported Ni-Phosphide Catalysts

Ni-phosphide catalysts on SAPO-11 were studied in the hydrodeoxygenation-isomerization of methyl palmitate (C15H31COOCH3-MP). The catalysts were synthesized using temperature-programmed reduction (TPR) of a phosphate precursor ((NH4)(2)HPO4 and Ni(CH3CH2COO)(2)), TPR of a phosphite precursor (H3PO3 and Ni(OH)(2)), and using phosphidation of Ni/SAPO-11 by PPh3 in the liquid phase. The samples were characterized by ICP-AES chemical analysis, N-2 physisorption, NH3-TPD, XRD, and TEM. First, the screening of the catalysts prepared by the TPR method was carried out in a semi-batch autoclave to determine the influence of the preparation method and conditions on one-pot HDO-isomerization (290-380 degrees C, 2-3 MPa). The precursor's nature and the amount of phosphorus strongly influenced the activity of the catalysts and their surface area and acidity. Isomerization occurred only at a low P content (Ni/P = 2/1) and blocking of the SAPO-11 channels by unreduced phosphates at higher P contents did not allow us to obtain iso-alkanes. Experiments with liquid phosphidation samples in a continuous-flow reactor also showed the strong dependence of activity on phosphidation duration as well as on Ni content. The highest yield of isomerized products (66% iso-C15-16 hydrocarbons, at complete conversion of O-containing compounds, 340 degrees C, 2 MPa, and LHSV = 5.3 h(-1)) was obtained over 7% Ni2P/SAPO-11 prepared by the liquid phosphidation method.

Automated summary

Ni-phosphide catalysts on SAPO-11 were studied for the hydrodeoxygenation-isomerization of methyl palmitate. The properties of the catalysts synthesized using different methods strongly influenced their activity, and the highest activity was obtained with 7% Ni2P/SAPO-11 prepared by liquid phosphidation.