Zirconium-oxide catalyst for producing biodiesel, as well as preparation method and application of zirconium-oxide catalyst

Abstract

The invention discloses a zirconium-oxide catalyst for producing biodiesel, as well as a preparation method and an application of the zirconium-oxide catalyst. The zirconium-oxide catalyst comprises the following substances in percent by weight: 80%-95% of ZrO, 2%-18% of Al2O3, 1%-17% of TiO2, 5%-25% of NaHCO3, and 10%-50% of NaCl. The preparation method comprises the following steps: weighing the ZrO2, the Al2O3 and the TiO2, and carrying out ball milling for 24 hours, then adding the NaCl and the NaHCO3, adopting acid silica sol as a binding agent, mixing uniformly, granulating, forming, and drying for 12 hours at the temperature of 120 DEG C; maintaining the temperature for one hour at the temperature of 500 DEG C in a muffle furnace, then rising the temperature to 1460-1600 DEG C rapidly, roasting for 40-200 minutes and cooling. A pipe-type reactor is filled with the zirconium-oxide catalyst, wherein the reaction temperature is 250-300 DEG C, the reaction pressure is 7-14MPa and the alcohol-oil volume ratio is (0.5:1)-(7:1). The zirconium-oxide catalyst is good in heat stability, high in conversion rate, strong in repeated utilization and resistant in acid and water, and can be permanently used by one-time filling; under the resistance of a bed layer, the zirconium-oxide catalyst is stable in structure, not slimed, not easily blocked and very suitable for industrial production; loose pores are formed in the catalyst and in the surface of the catalyst, so that the catalyst has the extremely-high catalytic activity.

Description

technical field

[0001] The invention belongs to the field of catalyst and preparation. Background technique

[0002] Biodiesel is called "liquid solar energy" because of its good biodegradability, environmental friendliness and renewable properties, and is considered to be one of the most valuable liquid biomass energy sources. The production and research of biodiesel by chemical methods often requires the participation of catalysts to achieve the expected purpose of the reaction. The performance of the catalyst is directly related to whether the reaction can proceed smoothly, especially the easy product separation and high catalytic efficiency and repeatability. A good catalyst is the key to the industrial application of the preparation technology. However, at present, the homogeneous catalysts commonly used in the production of biodiesel in industry often have some difficult problems in the process of biodiesel production, which hinders its industrialization and applicati...