36results about How to "Achieve catalytic effect" patented technology

A polyurethane catalyst comprises a sodium compound which is 1-60 wt% of the polyurethane catalyst, and a tertiary amine and / or pyridine compound. The sodium compound and the tertiary amine and / or pyridine compound achieve the synergistic effect; during the catalysis of the polymerization of isocyanate and polyalcohol, the speed of the polymerization reaction is increased; the prepared polyurethane material high tensile strength, elasticity, aging resistance and other physical properties; besides, the catalyst does not contain any heavy metal element at all, is an environment-friendly catalyst, and is particularly applicable to the preparation of rigid polyurethane foamed plastic, a rigid polyurethane elastomer and a composite material thereof, as well as a polyurethane sole material; moreover, compared with the traditional catalyst, the catalyst, provided by the invention, has the advantages that the hydrolysis resistance is good, and the storage stability is obviously improved.

The invention discloses a sulfonated-graphene-based novel Ru(bpy)3<2+> nano heterogeneous catalyst and a preparation method thereof. The nano heterogeneous catalyst comprises a sulfonated graphene matrix and Ru(bpy)3<2+> groups, wherein the sulfonated graphene matrix comprises a graphene matrix and sulfonic groups distributed on the graphene matrix; the Ru(bpy)3<2+> groups are connected onto the sulfonated graphene matrix after being matched with the sulfonic groups, and the active sites of the Ru(bpy)3<2+> groups are dispersed on a two-dimensional plane of the graphene matrix. The preparation process comprises the following steps: carrying out an ion exchange reaction on sulfonated reduction graphene and Ru(bpy)3<2+> to form the nano heterogeneous catalyst. The nano heterogeneous catalyst is high in chemical and heat stability, has catalytic active sites of Ru(bpy)3<2+> with visible-light activity, is high in catalytic activity, can be well dispersed in a reaction system, is easy to recover, is suitable for repeated use, and can be widely applied to a light-induced electron transfer reaction; simultaneously, the preparation process is simple, the raw material is low in cost and easily available, the cost is low and the need of large-scale production is met.

The invention discloses a lead-containing catalyst, which is prepared by the following method: the lead-containing blast furnace dust is ground by a ball mill and passed through a 75-400 mesh sieve; the sieved lead-containing blast furnace dust is placed in an oven at 75-105°C Drying for 5‑48 hours to obtain the pretreated lead-containing blast furnace dust; take the pretreated lead-containing blast furnace dust and place it in a high-temperature tubular reaction furnace, and calcinate it in an inert gas at 200-1000°C for 1-24 hours, The gas flow rate is set to 1-40mL / min, and the calcined sample is passed through a 75-400 mesh sieve to obtain the required lead-containing blast furnace dust catalyst. The catalyst is both acidic and basic, and can be automatically separated from the liquid product by standing still. It can be directly used in the reaction of high acid value oil, and the catalytic effect is very good, the yield of biodiesel is >95%, and the recovery rate of catalyst is >90%. Moreover, the recycling ability is better, and the yield of biodiesel can reach more than 80% after 5 reactions.

The invention discloses a mesoporous phenolic resin / copper nano particle heterogeneous catalyst, and a preparation method and an application of catalyst. With ordered mesoporous phenolic resin as carrier and elementary substance state copper nano particle as catalyst active component, the heterogeneous catalyst has a regular mesoporous structure, as well as has the characteristics of large specific surface area, uniform particle size distribution, even active site distribution and the like; meanwhile, the catalyst has high chemical and thermal stabilities, can be dispersed well in a reaction system, is easy to recover and recycle, and is widely applied to each elementary copper based organic catalytic reaction. Furthermore, the preparation process of the catalyst is simple, the raw materials are cheap and available, the cost is low, and no reducing agent is added during the preparation process, so that the environment-friendly effect is achieved.

The invention discloses a biomimetic catalyst for generating acetal or ketone by catalyzing a condensation reaction between aldehyde or ketone and alcohol. The biomimetic catalyst is cyclodextrin or a derivative of cyclodextrin. The cyclodextrin catalyst has the advantages of no corrosion equipment, no toxic or side effect, and environment friendliness. The invention also discloses a method for preparing acetal or ketal compounds by catalyzing a condensation reaction between aldehyde or ketone and alcohol by cyclodextrin or the cyclodextrin derivative.

The invention discloses a catalyst, which is prepared by the following method: grinding blast furnace dust with a ball mill and sieving; drying the sieved blast furnace dust at 75-105°C for more than 5 hours to obtain pretreated iron-containing blast furnace dust ; Immerse the pretreated blast furnace dust with sodium salt solution, place it in an oil bath at 65 o Magnetic stirring under the condition of C, the obtained sample is at 75‑105 o C condition is dried for more than 5 hours, the dried sample is sieved, and then 500‑700 under nitrogen atmosphere o C is calcined to obtain sodium salt-blast furnace dust catalyst. The catalyst can be directly used in the reaction of low acid value oil, the yield of biodiesel is ≥95%, and the recycling ability is good, and the yield of biodiesel can reach more than 90% after 16 recovery cycles.

The invention provides a preparation method of a silver-loaded selectivity-changeable polymer catalyst. According to the preparation method, functional monomers involved in the method are a binary copolymerization functional monomer system for constructing a polymer molecule recognition framework and a movable functional group side chain structure. A substrate and an active component silver precursor are first dissolved in dimethyl sulfoxide for complexing, then the functional monomers, a crosslinking agent and an initiator are added, nitrogen is injected into the solution for deoxidation, the mixture is sealed and put under an ultraviolet lamp to be irradiated for polymerization initiation, and then a catalyst precursor is formed; Ag ions in the catalyst precursor are subjected to sodium borohydride reaction, an obtained product is washed repeatedly with water and ethylene alcohol to remove blotted substrate molecules, and the silver-loaded selectivity-changeable polymer catalyst is obtained after vacuum drying. The silver-loaded selectivity-changeable polymer catalyst can be used for direct preparation of aminobenzyl alcohol from an isomer mixture of nitrobenzyl alcohol and other industrial raw materials. The preparation method has the advantages of being simple in technical principle, making raw materials obtained easily, convenient to operate and making preparation easy.