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

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 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 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 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 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.