1142results about How to "Reduce carbon deposition" patented technology

The catalytic cracking catalyst contains medium and large pore alumina with average pore size not smaller than 3 nm 5-60 wt%, zeolite 5-60 wt%, adhesive 5-40 wt% and clay 5-85 wt%. The preparation process includes mixing the said materials, spraying, roasting, washing and drying. Compared with conventional catalyst, the catalyst has strengthened heavy oil converting capacity, obviously improved gasoline and coke selectivity and strengthened heavy metal nickel resistance.

The invention discloses a platinum aluminium oxide series catalyst for preparing propylene by propane dehydrogenation and a preparation method of the catalyst. The catalyst is as shown in a formula PtSnX1X2/Al2O3, wherein in the formula, the content of noble metal Pt is 0.25%-0.35%, the content of metal Sn is 0.1%-3.5%, the total contents of auxiliaries X1 and X2 are 0.5%-3%, and X1 and X2 are selected from one of K, Ga, Zr, Cu, Mg, Zn, Ba, La, Y, Tm, Fe, Na, Cl, Zn, Ce, Sc and Sb. The platinum aluminium oxide series catalyst provided by the invention has the advantages that propylene dehydrogenation is catalyzed by adopting the catalyst at the reaction temperature of 590-650 DEG C at the pressure of less than 0.25Mpa, so as to obtain stable propane conversion rate and propylene selectivity greater than 95.8% are obtained; the single service life of the catalyst is long, the noble metals are not lost, and the catalyzing property of the catalyst after regeneration is good.

The invention relates to a selective hydrodesulfurization catalyst contains cobalt and molybdenum as active components. The selective hydrodesulfurization catalyst is characterized in that silicon oxide and aluminum oxide are used as carriers of the catalyst; based on the total weight of 100%, the catalyst comprises 2-6wt% of cobalt oxide, 9-15 wt% of molybdenum oxide, 2-8wt% of alkaline earth metal oxide, 2-6wt% of phosphorus oxide, 3-5wt% of alkali metal oxide, 2-6wt% of silicon oxide and 54-80 wt% of aluminum oxide; and the catalyst has the specific surface area of 200-300m<2>/g and the pore volume of 0.5-0.7mL/g. The catalyst has high hydrogenation activity and selectivity, good stability, low research octane number loss and high liquid yield. The catalyst is suitable for selective hydrodesulfrization of low-quality gasoline and is particularly suitable for selective hydrodesulfrization of low-quality FCC (Family Car China) gasoline.

The invention discloses a reduction method for an iron-based catalyst for Fischer-Tropsch synthesis in a fixed bed. The method comprises the following steps: adding the iron-based catalyst into a fixed bed reactor; and introducing gaseous hydrocarbon or mixed gas of hydrogen and gaseous hydrocarbon into the fixed bed reactor for reduction reaction to reduce the iron-based catalyst. The reduction method has the advantages that (1) the reduced catalyst has a little carbon deposit, so the catalyst has high activity and stability; (2) the product selectivity of the catalyst can be effectively modulated, and the selectivity for C5-30 in products is high; and (3) the reduced catalyst has a little carburization, so the catalyst has high wear resistance.

The present invention relates to an aromatization catalyst and production process of clean gasoline. Said invention adopts hydrofining and aromizing two-stage catalyst combined process to make the FCC gasoline with high sulfur content and high olefin content into clean gasoline. Said invented aromatization catalyst adopts small-grain molecular sieve catalyst, and makes the aromatization catalyst undergo the process of hydrothermal treatment and can make the strong acid quantity of said catalyst be reduced. Said invention can raise yield of gasoline, and can obtain high-quality clean gasoline product.

The invention relates to a catalytic cracking propylene additive. The additive measured in the total weight of 100 percent is characterized by being prepared from the following components in percentage by weight: 30-80 percent of molecular sieve including 28-78 percent of ZSM-5 zeolite, 10-65 percent of clay and 5.0-20.0 percent of P2O5, preferable 7.0-15.0 percent as well as 0-1.0 percent of La2O3. Aluminum phosphate sol is adopted as an adhesive to improve the abrasive strength of the additive, improve the solid content of spraying slurry and avoid the chlorine contents of the spraying slurry and the additive. The prepared catalytic cracking propylene additive remarkably improves the activity, slightly lessens the activity of a main catalyst when mixing with the main catalyst for use, can improve the product distribution, have favorable dry gas and coke selectivity and simultaneously improve the propylene yield and the gasoline octane number.

Method and equipment for converting hydrocarbon fuel to a mixture of hydrogen and carbon monoxide through catalytic partial oxidation. Thermal management of the process in the pre-reaction and post reaction zones of the reactor enhance yields and reduces carbon deposition.

The invention discloses a noble metal catalyst for preparing propylene through propane dehydrogenation and a preparation method thereof, and is used for mainly solving the problems that a noble metal catalyst is prone to carbon deposition and deactivation at high temperature to affect the stability of the catalyst. The used catalyst can be represented by PtSnCa/Al2O3, that is to say, platinum and tin components are supported on an alumina carrier, and a second auxiliary agent calcium oxide is introduced, so as to improve the stability of the catalyst. The catalyst is adopted for catalysis of propane dehydrogenation to prepare propylene under conditions of the temperature of 590 DEG C and the pressure of less than 0.2 MPa, the life of the catalyst can reach 145 h, and the service life of the catalyst is greatly prolonged, so that the problem is relatively well solved. The catalyst is in favor of industrialized promotion of propane dehydrogenation for preparing propylene.

A piston for an internal combustion engine comprises a sealed cooling gallery extending circumferentially around a center axis beneath a bowl rim of an upper crown. A metal-containing composition having a high thermal conductivity fills a portion of the sealed cooling gallery to dissipate heat. The metal-containing composition includes a base material having a melting temperature less than 181° C. and a plurality of metal particles having a thermal conductivity greater than the thermal conductivity of the base material. For example, the metal-containing composition can comprise copper particles dispersed in silicone oil, or copper particles dispersed in a mixture of alkali metals. During high temperature operation, as the piston reciprocates in the cylinder bore, the base material is liquid and flows throughout the cooling gallery to dissipate heat away from the upper and lower crowns.

The present invention provides catalysts, methods, and reactor systems for converting oxygenated hydrocarbons to oxygenated compounds. The invention includes methods for producing cyclic ethers, monooxygenates, dioxygenates, ketones, aldehydes, carboxylic acids, and alcohols from oxygenated hydrocarbons, such as carbohydrates, sugars, sugar alcohols, sugar degradation products, and the like, using catalysts containing palladium, molybdenum, tin, and tungsten. The oxygenated compounds produced are useful in the production of liquid fuels, chemicals, and other products.

The invention discloses an alcohol-based fuel combustion improver and an alcohol-based fuel. The alcohol-based fuel combustion improver consists of 4.9-93 parts by weight of co-solvent, 4.9-93 parts by weight of bio-oil, 0.1-0.3 part by weight of smoke suppression combustion improver and 1.0-3.0 parts by weight of combustion improver; and the alcohol-based fuel is formed by mixing and stirring 80-99 parts by weight of methanol and 1-20 parts by weight of alcohol-based fuel combustion improver. By adopting the combustion improver disclosed by the invention, the prepared alcohol-based fuel is a novel biological environment-friendly alcohol-based fuel, the calorific value is as high as 6,000-10,000 calories/g, and the combustion performance is good; and moreover, the alcohol-based fuel has high flash point and low volatility, and potential safety hazards in the prior art are eliminated. The alcohol-based fuel disclosed by the invention also has the characteristics of being safe and environment-friendly, reproducible, clean and sanitary, convenient to use, cheap and the like.

The invention relates to a preparation method of perovskite-like La2NiO4 catalyst and applications. The method includes the specific steps of: taking the soluble metal salts of La, Ni as raw materials to formulate a soluble metal salt solution with the concentration of 0.1-0.3mol/L; using citric acid with the concentration of 0.1-0.3mol/L as complexing agent; dripping the metal salt solution to the complexing agent according to the mol ratio of La:Ni: citric acid being 2:1:2-2:1:4 and implementing ultrasonic oscillation treatment to form sol; heating and stirring the sol in water bath with the temperature of 60-90 DEG C to be gelated; and drying the gelated sol at the temperature of 90-150 DEG C for 10-30h to form a product precursor; arranging the product precursor in a microwave synthesis furnace; and treating the product precursor at the temperature of 600-1000 DEG C for 30-180min and reducing the obtained product. When the La2NiO4 catalyst prepared by the method is applied to hydrogen production by ethanol vapor reforming, the characteristics of even components and uniform grain diameter are available.

The invention discloses a hydro-denitrification catalyst for coal tar and a preparation method thereof. The catalyst is composed of an active component, an additive and a carrier, wherein the active component is composed of tungsten trioxide and nickel oxide, and through taking the total mass of the catalyst as a benchmark, the content of the tungsten trioxide accounts for 16-24 wt % of the catalyst, and the content of the nickel oxide accounts for 3-6 wt % of the catalyst; the additive is phosphorus, through taking the total mass of the catalyst as a benchmark, and in terms of an elementary substance, the phosphorus accounts for 1-2 wt % of the catalyst; through taking the total mass of the catalyst as a benchmark, and in terms of a carrier dry basis, the carrier accounts for 68-80 wt % of the catalyst; and the carrier is composed of activated carbon, alumina and a H beta molecular sieve, wherein the activated carbon accounts for 10-31 wt % of the carrier, the alumina accounts for 53-82 wt % of the carrier, and the H beta molecular sieve accounts for 8-16 wt % of the carrier. The catalyst disclosed by the invention is easy to vulcanize and relatively high in activity; and a pore structure of the activated carbon is adjustable, so that the conversion of colloid components and the removal of nitrogen impurities in coal tar are facilitated, thereby slowing the carbon deposition of the catalyst. Compared with conventional catalysts, the prepared catalyst has more excellent hydro-denitrification performance.

RFCC (Resid Fluid Catalytic Cracking) high octane gasoline additive contains the following ingredients by weight percentage taking the total weight of the additive as 100%: 5-90 of H-type (Hydrogen) composite molecular sieve, 1-60 of BETA or EU-1 molecular sieve, 1-30 of ZSM-5 molecular sieve adopting modified or non-modified chemical elements, 2-60 of clay, and 7.0-15.0 of P(calculated based on P205) wherein the precursor of the P is aluminum phosphate sol; and 2-10 of A1 and 5-15 of P are contained in the aluminum phosphate sol, and the PH value of the aluminum phosphate sol is 1.0 to 2.5; and 2-20 of the aluminum phosphate sol is calculated based on HNO3. By adopting the preparation method provided by the invention, the activity of the FCC additives is significantly enhanced; and owing to mixing use with main catalytic agent, the product distribution can be improved, the gasoline octane value is improved, and the gasoline productivity is improved at the same time.

The present invention is loading method of hydroprocessing catalyst. Unlike conventional grading loading scheme, The hydrogenating and denitrogenating reaction region is loaded with the catalyst in antitone grading mold, in which the activity of the hydrogenating and denitrogenating catalyst in the downstream bed side is slightly lower than that in the upstream bed side, and the pore size of the catalyst in the downstream bed side is slightly greater than that in the upstream bed side. The said loading method can control the temperature raise of hydrogenating and denitrogenating catalyst bed, reduce cold hydrogen amount to lower the hydrogen consumption of the apparatus, reduce the carbon deposit speed in the catalyst bed to reduce bed pressure drop of bed, and prolong the service life of catalyst.