Sucrose facilitated synthesis of mesoporous silicoaluminophosphate SAPO-11 with different crystalline phases of MoO3 for highly-efficient oxidative desulfurization

The mesoporous silicoaluminophosphate SAPO-11 materials were synthesized by using the green and low-cost sucrose as template. The SAPO-11 were characterized by SEM, TEM, N-2 physisorption and FT-IR. Sucrose was incorporated into the crystal structure of SAPO-11 crystals to form secondary meso-porosity. Meanwhile, the mesoporous Mo-VI/SAPO-11 samples with different MoO3 crystalline phases were synthesized. In addition, the pre-prepared optimal catalyst (with 3.6% molybdenum mass content) showed significantly high yield and durability for oxidative desulfurization (ODS). Interestingly, the yield of alpha-MoO3 composites was more than twice that of pure mesoporous SAPO-11 samples, due to the synergistic effect of secondary mesoporosity and molybdenum oxide. Then, the ODS reaction products were determined by GC-MS and H-1 NMR. The leaching of active species in the liquid under the reaction conditions were evaluated. Besides, the kinetic properties were studied to calculate the activation energy of the reaction, and then a plausible mechanism of oxidative desulphurization reaction was also proposed. (C) 2018 Elsevier Inc. All rights reserved.