31results about How to "Resolve low activity" patented technology

The invention discloses an application of Ce(IO3)4, and provides an application example of the compound for the first time. As a catalyst, the Ce(IO3)4 can degrade organic dyestuff pollutants under a condition of completely lucifugal room temperature. The Ce(IO3)4 catalyzes and degrades the activity of Rhodamine B (RhB) and methyl orange (MO) dyestuff under a completely lucifugal condition, and is apparently superior to a commercial titanium dioxide (P25) photocatalyst under visible light irradiation. When the Ce(IO3)4 disclosed by the invention catalyzes and degrades dyestuff, illumination is not required; the activity is relatively high; the preparation method for the Ce(IO3)4 is simple; the preparation condition is mild; therefore, the Ce(IO3)4 is favorably popularized and applied.

The invention relates to a method for producing EC (ethylene carbonate) and mainly solves the problem of low activity of a heterogeneous catalyst in the prior art. The problem is better solved by means of the technical scheme as follows: the method comprises the step that ethylene oxide and carbon dioxide are contacted with a catalyst under the reaction condition, wherein the catalyst is a supported type composite metal oxide catalyst M2O-TO2 / SP; M is at least one of alkaline metal Na, K, Rb or Cs; T is at least one of Ti or Zr; SP is at least one of porous silica, SBA-15, MCM-41, MCF, HMS, alumina or activated carbon; the content of M2O is 1%-20% by weight, the content of TO2 is 5%-30% by weight, and the content of SP is 50%-94% by weight. The method for producing EC can be applied to industrial production of EC prepared from ethylene oxide and carbon dioxide.

The invention provides pump concrete doped with low-quality recycled micropowder and low-quality recycled aggregate, and belongs to the field of building materials. The pump concrete is composed of the following raw materials including cement, the low-quality recycled micropowder, slag powder, fly ash, mixed fine aggregate, mixed coarse aggregate, a compound pumping agent and water, wherein the mixed fine aggregate is composed of low-quality recycled fine aggregate and common fine aggregate; the mixed coarse aggregate is composed of low-quality recycled coarse aggregate and common coarse aggregate; and the compound pumping agent comprises a salt of sulfonated polystyrene-acrylic acid copolymer and a salt. The pump concrete has the characteristics of good work performance and excellent mechanical properties and durability, and can be pumped easily.

The invention discloses an active excitatory grinding aid for ferronickel slag and a preparation method for the active excitatory grinding aid. The grinding aid is composed of polymeric glycol, cocoanut fatty acid diethanolamide, sodium pyrophosphate, ethyl acetate, an excitant and water, wherein the excitant is composed of calcined alunite, water glass and sodium abietate. The additive amount of the grinding aid in the ferronickel slag is 0.02-0.10% by mass of the ferronickel slag. The active excitatory grinding aid disclosed by the invention is sufficient in raw materials, simple to process and prepare, low in doping amount, stable in performance and high in cost performance. As the ferronickel slag which is ground is added, the problem that the ferronickel slag is poor in grindability can be solved. Under the condition that the grinding time is equal, the specific surface area of the ferronickel slag micropowder can be improved by 4.5-9%, the mill output is increased by over 15%, the energy consumption is remarkably reduced, and moreover, the active index of the ferronickel slag can be further improved by 10-35%.

The invention belongs to the technical field of electrochemical power sources and discloses boron-doped manganese phosphate lithium / carbon composite materials and a preparation method thereof. The preparation method of the boron-doped manganese phosphate lithium / the carbon composite materials is characterized in that boron compounds, a lithium source, a manganese source, a phosphorus source and carbon source compounds are mixed uniformly through ball-milling and calcined for one shot under inert atmosphere, and therefore boron-doped manganese phosphate lithium material can be obtained. The general formula of the preparation method of the boron-doped manganese phosphate lithium / the carbon composite materials is LiMnP1-xBxO4-delta / C. Doped boron improves electrochemical performance of manganese phosphate lithium. The boron-doped manganese phosphate lithium / the carbon composite materials can be used as lithium-ion secondary battery anode materials.

The invention relates to a method for low-temperature treatment of commercial iron powder with liquid nitrogen to enhance its ability to reduce and remove pollutants. Since commercial iron powder is easily oxidized during the preparation and storage process, the surface is covered with a layer of nano-scale iron oxide, which greatly reduces its reducing ability. The purpose of the present invention is to adopt a simple and easy method to solve the problem of poor activity of commercial iron powder. The method comprises: quenching the commercial iron powder to obtain the commercial iron powder with enhanced ability to reduce and remove pollutants. The quenching treatment cracks the oxide layer on the surface of the iron powder, exposing the active zero-valent iron inside (bottom layer). Compared with other chemical or physical methods, the method for low-temperature treatment of commercial iron powder with liquid nitrogen provided by the invention is simple and easy, and has the characteristics of high efficiency, no pollution and environmental friendliness, and solves the problem of low activity of pollutants in the current commercial iron powder treatment. It is expected to be widely used in environmental pollution control.

The invention relates to a method for synthesizing dimethyl carbonate, which mainly solves the problems of poor catalyst activity and easy loss of active components in the prior art. The present invention is by adopting to comprise under transesterification reaction condition, the step that ethylene carbonate and methyl alcohol contact with catalyzer; Described catalyzer is supported composite metal oxide catalyst MO-TO 2 / SP; M is at least one of alkaline earth metal Mg, Ca, Sr or Ba; T is at least one of Ti or Zr; SP is porous silica, SBA-15, MCM-41, MCF, HMS, oxide At least one of aluminum or activated carbon; the weight content of MO is 1-20%, TO 2 The technical scheme that the weight content of SP is 5-30%, and the weight content of SP is 50-94% solves this problem well, and can be used in the industrial production of dimethyl carbonate prepared by transesterification of ethylene carbonate and methanol.

The present invention discloses applications of cerium hydrogen iodate tetrahydrate (CeHIO6.4H2O), and firstly provides the application example of the compound. According to the present invention, the cerium hydrogen iodate tetrahydrate adopted as a catalyst can degrade organic dye contaminants at a room temperature under a completely dark condition; the methyl orange (MO) dye catalytic degradation activity of CeOIO6.4H2O under a completely dark condition is significantly higher than the methyl orange (MO) dye catalytic degradation activity of commercial titanium dioxide (P25) photocatalysts under visible light irradiation; CeHIO6.4H2O is highly durable, wherein the activity is not significantly reduced after CeHIO6.4H2O is recycled 3 times in the MO degradation experiment; when the CeHIO6.4H2O performs the catalytic degradation of dyes, the characteristics of no requirement of illumination, high activity and high durability are provided; and the preparation method is simple, the preparation condition is mild, and the method is suitable for popularization and application.

The invention relates to a method for preparing ethylene carbonate and mainly solves the problem of low activity of heterogeneous catalysts in the prior art. The method comprises the step of contacting ethylene oxide and carbon dioxide with a catalyst under reaction conditions; the catalyst contains 5wt%-40wt% of alkaline-earth metal based on MO and 60wt%-95wt% of a phosphorus aluminum oxide carrier APO. With adoption of the technical scheme, the problems are better solved, and the method can be used for preparation of ethylene carbonate from ethylene oxide and carbon dioxide in industrial production.

The invention relates to a method for producing ethylene carbonate from ethylene oxide and CO2 and mainly solves the problem that heterogeneous catalysts have low activity in the prior art. The methodcomprises the step of contacting ethylene oxide and CO2 with a catalyst under the reaction condition, wherein the catalyst is a supported compound e metal oxide catalyst MO-TO2 / SP; M is at least oneof alkaline earth metals Mg, Ca, Sr and Ba; T is at least one of Ti and Zr; SP is at least one of porous silicon oxide, SBA-15, MCM-41, MCF, HMS, aluminum oxide and activated carbon; the weight content of MO is 1%-20%, the weight content of TO2 is 5%-30% and the weight content of SP is 50%-94%. With the adoption of the technical scheme, the problem is better solved and the method can be applied toindustrial production of preparation of ethylene carbonate from ethylene oxide and CO2.

The invention discloses a preparation method for a double metal cyanide catalyst for polycarbonate synthesis. The preparation method comprises the following steps of: firstly dissolving soluble metallic salt in organic ligand, and then adding deionized water to serve as a solution 1; dissolving water-soluble metallic cyanide salt in the deionized water to serve as a solution 2, wherein the volume ratio of the solution 1 to the solution 2 is 0.1: 1-5: 1; and then dripping the solution 2 to the solution 1 to obtain a solid catalyst after stirring and drying. In the invention, the influence of the deionized water to the synergic action between the organic ligand and the soluble metal salt is avoided; the synergic action between the organic ligand and the soluble metal salt in the DMC (Di Methyl Carbonate) catalyst is exerted at the greatest degree; and the reaction time when the catalyst catalyzes a copolymerization of propylene oxide and CO2 does not exceed 8h, the activity reaches to above 30Kg polymer / g catalyst, and the CO2 unit content in the polymer reaches up to 45.0%.

The invention discloses a supported bridged bis-phenoxy IVB metal catalyst and a preparation method thereof. The structural formula of the active component [ONNO]MX2 of the catalyst is disclosed as Formula (I) or Formula (II). The active component of the catalyst is supported on a triethyl-aluminum-modified MgCl2 / EtnAl(OR)[3-n] supporter, wherein R is C2-C5 straight-chain alkyl; and n represents the quantity of hydroxyl hydrogens substituted by triethyl aluminum in ethanol, and n=0-3. According to the characteristics of the [ONNO] bridged bis-phenoxy IVB metal catalyst framework ligand, the [ONNO] bridged bis-phenoxy IVB metal catalyst is supported on the MgCl2 / EtnAl(OR)[3-n] supporter to form a novel supported catalyst, thereby solving the problem of low activity in the homogeneous [ONNO] bridged bis-phenoxy IVB metal catalyst. The kinetic reaction of the novel supported catalyst is stable and efficient, has higher catalytic activity, and can be used for preparing branched polyethylene.

The invention discloses a method for preparing self-selected in-situ synthesized amorphous zirconia and its application in the transfer hydrogenation of cinnamaldehyde to prepare cinnamyl alcohol. The present invention adopts the self-selective in-situ synthesis method to obtain amorphous zirconia, and then uses it in the preparation of cinnamyl alcohol by transfer hydrogenation of cinnamaldehyde, which can prepare cinnamyl alcohol with high conversion rate and high selectivity; the raw materials used are low in price, and non- Noble metals have a short preparation period, which solves the problem of complex catalyst screening process and solves the problem of low activity of non-noble metal catalysts, and has good cycle stability. The present invention reduces the complex process of catalyst screening by self-selecting in-situ synthesis of catalysts, and is simpler than the preparation process of supported catalysts and saves costs.

The invention relates to a method for producing ethylene carbonate and mainly solves the problem of low activity of a heterogeneous catalyst in the prior art. The problem is better solved by means ofthe technical scheme as follows: the method comprises the following steps: ethylene oxide and carbon dioxide are contacted with a catalyst under the reaction condition, wherein the catalyst is prepared from 1wt%-30wt% of alkali metal on the basis of M2O and 70wt%-99wt% of aluminum phosphorus oxide carriers APO. The method can be applied to industrial production of preparation of ethylene carbonatefrom ethylene oxide and carbon dioxide.