Nickel-based catalyst for hydrodeoxygenation of oils and fats

Abstract

The invention discloses a nickel-based catalyst for hydrodeoxygenation of oils and fats, and relates to the technical field of catalyst preparation. According to the invention, nickel is taken as a main active component, copper oxide and manganese dioxide are taken as auxiliary active components, and nano-alumina is taken as a carrier, wherein the loading amount of the nickel is 10 to 20%, the loading amount of copper is 5 to 8% and the loading amount of manganese is 2 to 3%. The catalyst disclosed by the invention has the characteristics of high catalytic activity, long service life and strong stability, and the carrier is pretreated to further expand the pore channel of the nano-alumina, so that the average pore diameter of the pore channel of nano-alumina is more than 20 nanometers to not only greatly increase the loading amounts of the active components but also avoid the problem of permanent deactivation of the catalyst caused by carbon deposition for small aperture of the catalyst.

Description

Technical field: [0001] The invention relates to the technical field of catalyst preparation, in particular to a nickel-based catalyst for the hydrodeoxygenation of fats and oils. Background technique: [0002] Oil-based biomass is considered to be a potential renewable resource. The main components are carbon, hydrogen and oxygen, and are composed of saturated or unsaturated fatty acid glycerides and a small amount of free fatty acids. The carbon number of these fatty acids is distributed in C 14 -C 18 Among them, it is consistent with the corresponding diesel components, so the catalytic conversion of grease into fuel oil is a new way to solve the energy crisis. At present, the technologies for deoxygenation and conversion of fats and oils into aliphatic hydrocarbons mainly include metal sulfided catalyst hydrodeoxygenation technology, sulfur-free reduced metal hydrodeoxygenation technology and catalytic cracking technology. In the above-mentioned catalytic conversion technolo...

AI Technical Summary

Problems solved by technology

In the above oil catalytic conversion technology, the stability of the metal sulfurized catalyst is good, but it is necessary to introduce sulfur-containing hydrogen sulfide to maintain the activity of the catalyst, so it is easy to introduce sulfur-contaminated products

At present, the newly developed non-sulfur metal catalysts are greener and cleaner, and the reaction conditions are milder, but they have poor stability, low activity and short life.

The pore diameter of catalysts based on traditional microporous molecular sieves is less than 2nm, and oil macromolecules can only react on the surface of the catalyst and the pore openings. The diffusion of reactants, intermediates and products is the first to cause carbon deposition and permanently deactivate the catalyst.