49results about How to "High initial activity" patented technology

The invention discloses a preparation method and application of a ball-type activated clay for removing alkene in aromatic hydrocarbons. Compared with common particle white clay, the ball-type activated clay provided by the invention has characteristics of high mechanical strength, high initial alkene removal activity and long running life. Under the reaction temperature of 150-230 DEG C, the ball-type activated clay has initial alkene removal activity no nor than 5.0 mg Br / 100g, bromine index reduced to under 20 Br / 100g and service life of 1-3 years, and has good industrial application prospects.

The present invention discloses a method for the reductive activation of a dehydrogenation catalyst by using a gas mixture of hydrocarbon / hydrogen. The dehydrogenation catalyst is a platinum group metal-supported catalyst. The reductive activation of the dehydrogenation catalyst is performed before use. The gas mixture of hydrocarbon / hydrogen is used as a reducing gas for the reductive activation, a reductive activation temperature is from 300 DEG C to 600 DEG C, the reductive activation time is from 0.5 hours to 10.0 hours, preferably 1-5 hours, and the volume hourly space velocity of the reducing gas during the reductive activation is 500- 5000h<-1>. Compared with the prior art, the method of the present invention can further improve the activity and the activity stability of the dehydrogenation catalyst for light alkanes, and raises the yield of target products within a certain temperature range.

The invention provides a preparation method of a Pd-Cu / modified attapulgite clay catalyst, which comprises the steps of preparing a dispersant solution, and adding attapulgite clay; stirring and performing ultrasonic treatment on the formed suspension; standing and performing heat treatment on the upper-layer suspension; centrifuging and drying to obtain a modified carrier; preparing an aqueous solution of copper salt, palladium salt and urea, and impregnating the modified carrier; slowly drying and quickly roasting to obtain a finished product of the catalyst. The catalyst has high initial activity, good stability and relatively wide range of application conditions, and can perform effective catalytic oxidation of CO under the reaction conditions of reaction temperature of (-50)-100 DEG C, air speed of 2,500-10,000 / h, CO content of 10-10,000ppm and relative humidity of feed gas of 20-100%, and the deactivated catalyst can be regenerated. The preparation method of the catalyst provided by the invention has the advantages of simple process, easiness in operation, low cost and good application prospect.

The invention discloses a method for preparing a cobalt-based Fischer-Tropsch synthetic catalyst, which comprises a preparing process of the cobalt-based Fischer-Tropsch synthetic catalyst and a process of hydrothermal treatment. In the preparing process of the cobalt-based Fischer-Tropsch synthetic catalyst, an active component, i.e. cobalt and an addition agent are loaded to a catalyst carrier by adopting an immersion method; and the process of hydrothermal treatment comprises the step of carrying out the hydrothermal treatment for 0.5-2h by using water vapor at the temperature of 150-600 DEG C. According to the cobalt-based Fischer-Tropsch synthetic catalyst prepared through the method disclosed by the invention, the initial activity of the catalyst is lowered, so that the initial stage of reaction is easy to control; and meanwhile, the activity of the catalyst in a stable stage is improved, and thus, the long-term use of the catalyst is facilitated.

The invention relates to a method for preparing a styrene catalyst by ethyl benzene dehydrogenation, which mainly solves the problems of low initial activity and long induction period of the catalyst in the prior art. The method comprises the following steps of: mixing a required amount of cerium source, a required amount of iron source, potassium source, molybdenum source or tungsten source and mixture thereof, alkaline earth metal oxide and pore forming agent uniformly, and molding, drying and roasting to obtain a catalyst precursor I; and carrying the rest cerium source on the catalyst precursor I by adopting a dipping method, and drying and roasting to obtain the required catalyst. According to the technical scheme, the problems are well solved, and the method can be used for industrial production of preparing the styrene by ethyl benzene dehydrogenation.

The invention provides a method for preparing methyl acetate by carbonylation of dimethyl ether. The method comprises the following steps: subjecting a mixed gas of dimethyl ether and carbon monoxideto carry out a dimethyl ether carbonylation reaction through activated hydrogen-type clinoptilolite to obtain methyl acetate, wherein the hydrogen-type clinoptilolite has an HEU topological structure.The method provided by the invention adopts the hydrogen-type clinoptilolite having the HEU topological structure as a catalyst, the catalyst has an 8-element pore structure, and silicon-aluminum isrelatively low, and can maintain relatively high activity for a long time in the dimethyl ether carbonylation reaction process, thereby realizing the continuity and stability of methyl acetate prepared by carbonylation of dimethyl ether, and also ensuring that methyl acetate has relatively high initial activity.