Preparation and performance evaluation of hydrogenated silicon trap catalyst for coking gasoline and diesel

Objective  The aim is to remove organic silicon compounds in coking gasoline and diesel fractions and protect the catalysts from silicon poisoning.

Methods  The hydrogenated silicon trap catalyst was prepared by using pseudo-boehmite powder as the carrier materials and Ni-Mo as the active metal components by the equal volume impregnation process, and the catalyst was characterized by using N₂ adsorption-desorption, X-ray diffraction, pyridine infrared spectroscopy, scanning electron microscopy. The desilication activity and 2 000 h activity stability of the silicon trap catalyst were investigated on a 200 mL hydrogenation pilot device.

Results  The self-developed silicon trap catalyst had a high specific surface and pore volume and suitable acidity, with uniform distribution of active metals and strength meeting the loading requirements of industrial units. The silicon trap catalyst had high desilication activity. Under typical industrial conditions, the desilication rate was greater than 90%. During the 2 000 h activity stability test, the desilication rate was greater than 90% steadily, indicating good activity stability and high silicon capacity.

Conclusions  The self-developed silicon trap catalyst has broad industrial application prospects and is of great significance for clean fuel production and long-term stable operation of the units.