74results about How to "No decrease in activity" patented technology

A catalyst for preparing ethanediol by hydrating epoxy ethane is composed of the oxide of carried Nb, at least one element or compound chosen from V, Mo, W, Sn and Pb, and at least one element or compound chosen from La, Pr and Nd. Its advantages are low consumption of water and energy and no corrosion and pollution.

A method for producing hydrogen and carbon with mixture of metal magnesium and other metals as catalyst by catalytic decomposition is carried out by reacting at 0.01-10Pa and 200-1500degree and separating catalyst from products. It can re-used and not contain CO and CO2 impurities.

The present invention relates to a floating filter module installed in a water treatment apparatus, such as in a public water treatment plant, a village water supply facility, a public sewage treatment plant, a wastewater treatment plant, or a village sewage treatment plant, in order to remove contamination particles. The floating filter module according to the present invention comprises: a hollow-type sintered filter having a plurality of fine pores which is arranged in wastewater within a water treatment tank in order to separate and filter the contamination particles from the wastewater introduced into the water treatment tank; a floating body connected to the sintered filter, and which floats to the surface of the wastewater within the water treatment tank so as to position the sintered filter at the upper portion of the wastewater in the water treatment tank; a main pipe communicating with an inner space of the sintered filter; a suction device coupled to the main pipe in order to provide a suction force to the sintered filter through the main pipe, thereby suctioning the wastewater in the water treatment tank through the plurality of fine pores and into the sintered filter; and a compressed-air supply apparatus having a compressed-air supply tube communicating with the inner space of the sintered filter through the main tube and an air compressor coupled to the compressed-air supply tube in order to supply compressed air into the inner space of the sintered filter, thereby releasing from the sintered filter the contamination particles that clog the fine pores of the sintered filter.

The invention relates to a solid acid catalyst for preparing glycol by hydration of ethylene oxide for reducing water rate, energy consumption and cost, abating the pollution, and improving catalyst stability. The technology for preparing the catalyst is that: niobium-supported metal compound on oxide carrier is served as main active component, IVB metal compound and at least one of vanadium or tantalum metal compound are added as promoter. The catalyst is used for preparing glycol by hydration of ethylene oxide with good activity, selectivity and stability, low energy consumption and low cost.

The invention provides a process for preparing sulfur ether through catalytic oxidation comprising the steps of, adding 1-3 parts of raw material sulfur ether and 0.2-1 parts of solid catalyst MnFe[1,8]Cu[0.15]O4 into 5-10 parts of toluene solvent, reacting in oxygen atmosphere with a reaction temperature of 60-100 deg. C, wherein the parts of toluene solvent is by volume, the parts of sulfur ether is by mole parts, and the parts of catalyst is by weight. By using O2 as oxidizing agent for sulfur ether oxidization, the invention achieves the advantages of no environmental pollution and potential safety hazard proof.

The present invention relates to process of preparing dimethyl ether, and aims at providing technological scheme of preparing dimethyl ether in lowered reaction temperature, high catalyst efficiency, long service life of catalyst and other merits. The process of preparing dimethyl ether adopts methanol as main material and catalyst with niobium oxide as the main active component and P and / or S as the co-catalyst, and has reaction temperature of 100-350 deg.c and catalyst efficiency of 1-20 ml methanol / hr.g. The present invention may be applied in industrial production of dimethyl ether.

The invention relates to an anti-carbon-deposition Ni-based catalyst for hydrogen production by methane steam reforming and a preparation method thereof. By taking lanthanum nitrate, praseodymium nitrate, samarium nitrate, yttrium nitrate, zirconium nitrate, zirconium carbonate, zirconium oxychloride, and the like as precursors and taking ammonia as a precipitant, a pyrochlore composite oxide is prepared through using a coprecipitation method; and then the pyrochlore composite oxide is mixed with alumina by using a mechanical mixing method so as to obtain a pyrochlore alumina composite carrier. Nickel nitrate, nickel chloride, nickel sulfate, nickel oxalate and the like serving as nickel sources are loaded on the pyrochlore alumina composite carrier through direct immersion. The loading capacity of nickel in the catalyst accounts for 5-30% of the weight of the catalyst, the pyrochlore content of the catalyst is 5-50%, and the alumina content of the catalyst is 20-90%. By taking the pyrochlore alumina composite oxide as a carrier, the reaction activity and anti-carbon-deposition performance of the catalyst can be greatly increased; the preparation method of the catalyst is simple; and the catalyst has excellent catalytic activity and stability to methane steam reforming in a stationary bed.

The invention discloses an application of mercuric oxide. The mercuric oxide is taken as a photocatalyst to degrade an organic dye pollutant, so that the application scope of the mercuric oxide is wooden. The activity of the organic dye pollutant degraded by the mercuric oxide photocatalyst, such as a Rhodamine B dye is obviously higher than that of titanium dioxide P25 and is also obviously higher than that of a high-activity Ag3PO4 photocatalyst. Due to high durability of the mercuric oxide, the activity is not reduced after the mercuric oxide is recycled for more than 3 times. The mercuric oxide photocatalyst disclosed by the invention has high activity, high durability, simple preparation method and mild preparation conditions and facilitates popularization and application.

Provided are a catalyst for synthesizing oxalate through a CO coupling reaction and a preparation method therefor. The catalyst has a metal mesh as a framework, a layer of carrier coating is applied on a surface of the metal mesh, and an active component and an additives are loaded on a surface of the carrier coating. By using the catalyst, under the precondition that the activity is ensured, the amount of noble metal active components per unit volume of the catalyst is reduced, the pressure drop of the catalyst bed is decreased, and the radial temperature of the catalyst bed is lowered, thereby solving the problem of heat transfer in the reaction process and temperature runaway that easily occurs when a conventional honeycomb catalyst is used in the reaction system.