MANUFATURING METHOD OF THE TUNGSTEN OXIDE ALUMINA CATALYST, TUNGSTEN OXIDE ALUMINA CATALYST AND METHOD FOR REMOVING FREE FATTY ACID IN USED SOYBEAN OIL USING TUNGSTEN OXIDE ALUMINA CATALYST

摘要

PURPOSE: A method for preparing tungsten oxide alumina catalyst, the tungsten oxide alumina catalyst, and a method for eliminating free fatty acid from wasted cooking oil using the tungsten oxide alumina catalyst are provided to obtain a raw material for bio-diesel oil and improve the yield of the bio-diesel oil by lowering the content of the free fatty acid in the wasted cooking oil. CONSTITUTION: A method for preparing tungsten oxide alumina catalyst includes the following: Alumina is pre-processed at temperature between 400 and 550 degrees Celsius. 100 parts by weight of the pre-processed alumina and 5 to 30 parts by weight of tungstic acid are mixed. An ammonium hydroxide aqueous solution and a nitric acid are successively added to the mixture and are stirred. A filtering process, a drying process, and a sintering process are implemented after the stirring process.