Fe (II)-Zn solid acid catalyst for synthesizing biodiesel and preparation method

Abstract

The invention provides a transition metal promoted Fe (II)-Zn solid acid catalyst for synthesizing biodiesel. The catalyst is synthesized by using potassium ferrocyanide, zinc chloride, organic ligand tertiary butanol and polyethylene glycol; and transition metal compound in an amount which is 1 to 10 percent based on the mass of zinc oxide is added in a synthetic reaction process. A preparation method comprises the following steps: 1) preparing potassium ferrocyanide solution I; adding one or more transition metal salts in an amount which is 1 to 10 percent based on the mass of the zinc chloride to form 5mol / L solution II; dissolving the polyethylene glycol into the water and the tertiary butanol to form solution III; and 2) slowly dripping the solution I into the solution II with stirring to generate sediment, then adding the solution III into the sediment within 5 to 10 minutes, and continuously reacting the solution to obtain the Fe (II)-Zn catalyst. The catalyst of the invention can generate esterification and transesterification reaction in the synthesized biodiesel, and is little affected by water and acid. The activity of the catalyst added with the transition metal element is greatly improved, and the catalyst has good repeatability.

Description

technical field The invention relates to the technical field of chemistry, in particular to a transition metal-promoted Fe(II)-Zn solid acid catalyst for synthesizing biodiesel and a preparation method thereof. technical background Biodiesel, a biodegradable renewable energy source, consists of monoesters of fatty acids. The main sources are vegetable oils and animal fats, a potential alternative fuel. The production method of biodiesel is mainly prepared by transesterification of vegetable oil or animal fat with lower alcohol. Commonly used catalysis are acid catalysis, base catalysis, and enzyme catalysis. Commonly used acid-base catalysis is to use concentrated sulfuric acid or sodium hydroxide as catalyst. These homogeneous catalysts are very sensitive to FFA and water in feedstock oil and methanol, and FFA easily reacts with NaOH to form soap. Homogeneous catalysts are easily consumed in the reaction, are not renewable, and the glycerol produced is difficult to separ...

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Problems solved by technology

There are many reports on the research of solid acid catalysts, SO4 in (J Mol CatalA, 2005,266,93-100) 2- / TiO 2 , SO 4 2- / ZrO 2 , SO 4 2- / SnO 2 Wait for a series of SO 4 2- / MxOy type solid super acid has the advantages of high acid catalytic strength, easy separation, no corrosion of equipment, etc., but it is expensive and has high requirements for water content

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