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

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 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 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 relates to a method for treating commercial iron powder by liquid oxygen at low temperature for enhancing pollutant reductive removal ability. Because the commercial iron powder is easily oxidized in the preparation and storage process, one layer of iron oxide with nanometer thickness covers the surface, and then the reduction ability is greatly decreased. The method aims at solving the problem of poor activity of the commercial iron powder by using the simple and easy method. The method comprises the following step of chilling the commercial iron powder, so as to obtain the commercial iron powder of which the pollutant reductive removal ability is enhanced. The oxide layer at the surface of the iron powder is cracked by the chilling step, and the active zero-valence ion at the interior (bottom layer) is exposed. Compared with other chemical or physical methods, the method for treating the commercial iron powder by the liquid nitrogen at low temperature has the characteristics that the method is simple, the implementing is easy, the efficiency is high, the pollution is avoided, the environment-friendly property is realized, the problem of low activity of pollutant in the existing commercial iron powder treatment process is solved, and the method is expected to be widely applied into the environment pollution control aspect.

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 an application of CeGeO4. CeGeO4 as a catalyst has catalytic activity under an illumination condition and also can degrade organic dye pollutants under a completely lucifugal room temperature condition, and an application scope of CeGeO4 is enlarged. CeGeO4 ha apparently higher activity of catalytic degradation of rhodamine B (RhB) and methylene blue (MB) dyes under the completely lucifugal condition as compared with a CeO2 catalyst. CeGeO4 does not require illumination and has higher activity during catalytic degradation of the dyes; a preparation method of CeGeO4 is simple; a preparation condition is mild; and the popularization and application of CeGeO4 is facilitated.

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 belongs to the technical field of epoxy resin, and particularly relates to an epoxy curing agent and a preparation method and application thereof. The epoxy curing agent comprises the following raw materials: aliphatic amine/alicyclic amine, thiourea and polyether amine. The thiourea modified curing agent can still keep high activity at low temperature, and the problem of low activity of the curing agent caused by low temperature during construction in autumn and winter is effectively solved. Polyether amine has a bifunctional flexible chain segment, so that the molecular deflection of the curing agent is increased, long chain segments are mutually wound after curing, and the low-temperature toughness and impact resistance of a cured product are greatly improved. According to the preparation process of the epoxy curing agent, fatty amine/alicyclic amine and polyether amine react with thiourea respectively in two steps, and the situation that due to the fact that the two kinds of amine generate competitive reaction due to different activities, a designed product cannot reach an expected standard is avoided.

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 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 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.

The invention discloses an application of a Co-Ge-O photocatalysis0adsorption bifunctional material. As a bifunctional material, Co-Ge-O not only can adsorb organic dye pollutants, but also can degrade the organic dye pollutants under visible light, thereby widening the application range of the material. The adsorption performance and photocatalytic degradation performance under visible light of Co-Ge-O material for organic dyes are much higher than those of commercial titanium dioxide (P25) photocatalytic materials. The Co-Ge-O material has high adsorption and photocatalytic dye degradation activity, and the preparation method of the material is simple and is beneficial to popularization and application.