83 results about "Catalytic cycle" patented technology

The invention discloses a preparation method of a carbon film coated platinum/graphene catalyst. Graphene is adopted as a carrier for the catalyst to hydrothermally reduce oxidized graphene, saccharides, polyvinyl pyrrolidone and chloroplatinic acid, and then high-temperature carbonization is carried out to obtain a cathode oxygen reduction reaction catalyst of a fuel battery, wherein the platinum loading amount is 10-50wt%. The catalyst has excellent methanol tolerance and catalytic cycle stability, the performances of the catalyst are greatly improved in 1000 times of cyclic voltammetry testing, and the catalyst is superior to the commercial platinum/carbon catalyst.

The present invention relates to a method for biphasic hydroformaylation of olefins based on a phosphine-functionalized polyether alkyl guanidine salt ionic liquid. A biphasic catalytic system is used in the method, wherein the catalytic system consists of the phosphine-functionalized polyether alkyl guanidine salt ionic liquid, a rhodium catalyst, a reaction substrate - olefins and a reaction product - aldehydes; liquid/liquid biphasic hydroformylation of olefins is performed at a certain reaction temperature and syngas pressure; the phosphine-functionalized polyether alkyl guanidine salt ionic liquid acts both as a phosphine ligand and as a rhodium catalyst carrier; there is no need to add any other ionic liquid to the system; separation and recycling of the rhodium catalyst are realized by liquid/liquid biphasic separation after the reaction; the rhodium catalyst is capable of being recycled for multiple times with no obvious decrease in catalytic activity or selectivity; the TOF value of the system reaches 240-2700h-1; and the highest catalytic cycle cumulative TON value reaches 47138.

A catalytic conversion method utilizing petroleum hydrocarbon to produce high-octane gasoline comprises the following steps: light catalytic cycle oil is cut to obtain light fractions and heavy fractions, the heavy fractions are subjected to hydrotreatment to obtain hydrogenized heavy fractions, the light fractions and the hydrogenized heavy fractions separately enter an auxiliary riser reactor of a catalytic cracking unit, heavy petroleum hydrocarbons enter a main riser reactor of the catalytic cracking unit, cracking reaction is realized in the presence of a catalytic cracking catalyst, and the resultant is separated to obtain products including gasolene and light cycle oil. According to the invention, the light fractions of light cycle oil and the hydrogenized heavy fractions enter the auxiliary riser reactor layer by layer, so that severe conditions required for catalytic cracking reaction of different fractions of light cycle oil can be optimized and satisfied to the utmost extent, and accordingly, high-octane catalytic gasoline can be produced to the maximum extent.

The invention relates to a block-shaped Ag2MoO4@Ag@AgBr ternary complex, a preparation method thereof and application of the block-shaped Ag2MoO4@Ag@AgBr ternary complex to photocatalysis. With sodium molybdate and silver nitrate being raw materials and ethylene glycol being a reaction medium, the pH value of a system is controlled to be 6-8 on the condition that PVP is added, a reaction is carried out, and then block-shaped Ag2MoO4@Ag is obtained; next, based on the principle of ion exchange, with CTAB being a bromine source and ethyl alcohol being a solvent, a reaction with the Ag2MoO4@Ag is carried out, and then the final product, namely the block-shaped Ag2MoO4@Ag@AgBr ternary complex, is obtained. The final product has a single appearance and is even in size; when the final product is used as a catalyst to degrade RhB(15mg/L) dye solution, the degrading rate reaches 91% within 35 minutes under visible light, and complete degrading is achieved within 20 minutes under sunlight. in addition, under the visible light, a catalytic cycle reaction is carried out four times on the ternary complex, and the catalysis effect is not influenced greatly, which shows that the block-shaped Ag2MoO4@Ag@AgBr ternary complex has high catalytic activity and stability.

Provided are a MoS_xO_y/carbon nanocomposite material, a preparation method therefor and a use thereof. In the MoS_xO_y/carbon nanocomposite material, 2.5≤x≤3.1, 0.2≤y≤0.7, and the mass percent of MoS_xO_y is 5%-50% based on the total mass of the nanocomposite material. When the MoS_xO_y/carbon nanocomposite material is used as a catalyst for an electrocatalytic hydrogen evolution reaction, the current density is 150 mA/cm² or more at an overpotential of 300 mV. The difference between this performance and the performance of a commercial 20% Pt/C catalyst is relatively small, or even equivalent; and this performance is far better than the catalytic performance of an existing MOS₂ composite material. The MoS_xO_y/carbon nanocomposite material also has a good catalytic stability, and after 8,000 catalytic cycles, the current density thereof is only decreased by 3%, thus exhibiting a very good catalytic performance and cycle stability.

Screening methods to identify catalysts or to identify improved catalysts using mass spectrometric analysis of products of catalysis, particularly catalyst-bound intermediate products in the catalytic cycle. The methods are applicable, in particular, to screening of organometallic compounds for catalytic function. Moreover, the methods are applicable, in particular, to screening for catalysts for polymerization reactions. More specifically, the methods employ a two stage (or two step) mass spectrometric detection method in which ions formed in a first stage ionization and which are linked to catalyst performance are selected and the catalyst associated with the selected ion is identified in a second stage employing tandem mass spectrometry. In specific embodiments, the screening methods of this invention avoid explicit encoding because the identity of the catalyst is implicitly contained in the product molecular mass (typically an intermediate product), since the catalyst (or a portion thereof) remains attached to the product.

The invention relates to a method for high-selectivity preparation of normal aldehyde through olefin two-phase hydroformylation on the basis of a phosphine-functionalized polyether imidazolium salt ionic liquid. According to the method, a two-phase catalytic system is adopted, the catalytic system comprises a phosphine-functionalized polyether imidazolium salt ionic liquid, a polyether imidazolium salt ionic liquid, a rhodium catalyst, a reaction substrate olefin and a reaction product aldehyde, a liquid/liquid two-phase hydroformylation reaction is performed at certain reaction temperature and under certain synthesis gas pressure, the rhodium catalyst is separated and cycled through simple two-phase separation after the reaction ends, the rhodium catalyst can be recycled multiple times, and the catalytic activity and the selectivity are not remarkably reduced. The TOF value of the system reaches 400-3,300 h<-1> and the catalytic cycle accumulated TON value reaches 33,975.

The invention discloses a pretreatment method for waste incineration fly ash. The pretreatment method comprises the following steps of: 1, mixing: mixing the waste incineration fly ash with quartz powder and an alkali liquor into slurry; 2, heating and stirring: carrying out catalytic circular reaction under heating and stirring conditions; 3, solid-liquid separation: carrying out solid-liquid separation on the reacted slurry to obtain a leaching solution and leaching residues, and returning the leaching solution to the alkali liquor for recycling; and 4, post-treatment: carrying out cleaning, drying, ball milling, forming and the like on the leaching residues to obtain dechlorinated residues. The method has the advantages of simple raw materials, short process, easiness in industrial application and significance of resource saving and environment friendliness.

The invention relates to the technical field of heterogeneous catalytic materials, in particular to a preparation method of MOFs with a pi-activation catalytic action. The preparation method is characterized in that L1 and L2 are used as ligands; the ligands and metallic silver salt Tm are prepared by a stratified dispersal method to obtain a catalyst Ag8-MOF or Ag4-MOF with a plane coordination configuration, metal cluster nodes and the pi-activation catalytic action. A synthetic route of the catalyst is as follows: Tm+L1-Ag8-MOF or Tm+L2-Ag4-MOF; the ligand L1 is selected from TzNPAMeTs, and the L2 is selected from TzOPATs; the metallic silver salt Tm is selected from AgCF3COO or AgBF4. According to the preparation method disclosed by the invention, the synthesis of the catalyst is simple and easy to operate; catalytic reaction raw materials are low in price and high in yield, and are easy for large-area popularization and application. By regulating and controlling immobilization and coordination configuration of precious metal through thioamide ligands, the activity of the catalyst and catalytic conversion number are greatly improved; the easiness for recycling is realized, and the utilization rate of the precious metal is greatly improved, thereby reducing the integration cost of the whole catalytic cycle; the preparation method is suitable for meeting industrial large-scale production.

The invention provides a synthesis method of a baloxavir marboxil intermediate. The invention provides a synthesis method of a compound (III), which is prepared through three steps. The yield is improved, and the production is easy to control. At the same time, a synthesis method of a compound (IV) is provided. According to the synthesis method, the compound (III) and disulfide diphenyl carry outone-pot self-catalytic circulation reactions to generate the compound (IV). The invention provides a method for preparing a baloxavir marboxil intermediate (VIII) through the reactions mentioned above. Through the one-pot self-catalytic circulation reactions, thiophenol, which is strongly toxic and is strictly controlled, is not used, a safe baloxavir marboxil synthesis method is provided, and thesynthesis method is suitable for industrial production.

The invention discloses a porous titanium dioxide nano material, a metal nanoparticle modified porous titanium dioxide photocatalytic material and a preparation method and application of the metal nanoparticle modified porous titanium dioxide photocatalytic material, and belongs to the technical field of methane photochemical catalysis. The photocatalytic material provided by the invention is porous titanium dioxide and a composite material of porous titanium dioxide modified multiple metal nanoparticles, can perform photocatalysis on methane at a temperature as low as room temperature, avoids high energy consumption and danger in a high-temperature thermal catalytic reaction process, and can prevent methane from being excessively reduced to generate carbon deposition in a mild reaction process, and thus the service life of the catalyst is improved. Through different combinations of titanium dioxide and metal in the catalyst, the variety and distribution of hydrocarbons generated by the catalytic reaction can be regulated and controlled, and olefins are generated in a relatively high proportion. Good catalytic activity is shown by investigating the durability of the catalytic reaction in a catalytic cycle form, the catalytic reaction cycle can be stabilized for at least 50 times, and the total catalytic reaction time at least reaches 2 weeks.

The invention discloses a hybrid material of polypyridine zinc complex modified MIL-101, a preparation method and application in catalyzing degradation of organic phosphorus. A zinc complex capable ofcarrying out site separation is modified on a node of an activated chromium-based metal organic framework compound, a composite catalyst with multiple active centers is constructed, lewis acid activation of organic phosphorus by the zinc complex and MOFs hybrid material and catalytic breaking of P-O bonds by lewis base of the zinc complex on an MOF node are realized under a weakly alkaline condition, and the catalyst is used for degrading organic phosphorus. The hybrid material prepared by the method disclosed by the invention is relatively high in hydrolysis activity of catalyzing diethyl p-nitrophenol phosphate; the catalytic turnover frequency TOF of the hybrid material is 0.244 h<-1> and is improved by 40.2% compared with that of unmodified MIL-101, the hybrid material shows good catalytic cycle stability, the activity of the hybrid material is still kept at 95.7% after five cycles, and the hybrid material can be applied to degradation of organic phosphine poison.

The invention provides a synthesis method of a 3-sulfur-1-glycal compound. The preparation method comprises the following steps of: adding a catalyst, a ligand and galactan into an organic solvent andmercaptan/phenol; adding zinc powder, stirring and reacting at the temperature of 100 to 120 DEG C; detecting the reaction process through TLC, terminating the reaction when the galactan raw materialcompletely disappears, thereby obtaining 3-sulfur-1-glycal. The structural formula of mercaptan/phenol is R2-SH, and the structural formula of R2 comprises any one of methylene carboxylate, benzyl, alkyl, phenyl, substituted phenyl and five-membered or six-membered heterocyclic groups; and R1 comprises any one of a silicon group, an alkyl group, a C1-C18 alkyl group, a benzyl group, a phenyl group, a triphenylmethyl group, a pyridyl group, benzoate, pyridine acid ester and quinolinecarboxylic acid ester. According to the method, the cheap cobalt catalyst is adopted, the proper ligand and solvent are added to facilitate formation of a high-activity catalytic intermediate, and the zinc powder is added to promote smooth catalytic circulation of the cobalt catalyst.

The invention relates to a squaramide-derived covalent triazine skeleton polymer and application thereof in catalyzing coupling of carbon dioxide and epoxide to prepare cyclic carbonate. Squaramide monomers are used as raw materials, a series of squaramide-derived covalent triazine skeleton polymers are synthesized through a high-temperature ionothermal method, and the squaramide-derived covalent triazine skeleton polymers are used as catalysts to prepare cyclic carbonate. According to the method, carbon dioxide and epoxide with different substituent groups are used as raw materials, corresponding cyclic carbonate is synthesized under the conditions that the reaction pressure is 0.1-2.5 MPa, the reaction temperature is 70-110 DEG C and the reaction time is 2-6 hours, and high-selectivity catalysis of synthesis of cyclic carbonate under mild, metal-free and solvent-free conditions is realized. The polymer shows excellent adsorption and conversion dual functions on carbon dioxide, the catalytic activity is not obviously reduced after five catalytic cycles, the problem that a homogeneous catalyst is not easy to separate is solved, and the polymer has a good application prospect.

The hydrogen-added sulfur hexafluoride thermocatalytic cyclic degradation device comprises a raw material gas tank, a preprocessor, a first-stage pressure controller, a reactor, a second-stage pressure controller and an alkali washing pool which are sequentially connected through pipelines, the molecular sieve and the three-stage pressure controller are sequentially connected with an exhaust port of the alkaline washing pool through a pipeline; an exhaust outlet of the third-stage pressure controller is connected to a pipeline between the raw material gas tank and the pretreater through a pipeline with a ball valve; a circulating branch pipe which is connected in parallel with the molecular sieve and is provided with a ball valve is connected between the outlet of the molecular sieve and the outlet of the alkaline washing pool; branch pipes are respectively arranged at the intersection outlet end of the circulating branch pipe and the outlet of the molecular sieve and a pipeline between the secondary pressure controller and the alkaline washing pool; and the branch pipes are connected to a tail gas analysis and test system. The device not only can provide a gas chamber for reaction of SF6 and H2 with a catalyst, but also can provide a pipeline for recycling test waste gas. The device has the characteristics of high safety, sensitive temperature control, environment friendliness, low cost and the like.