81 results about "Incipient wetness impregnation" patented technology

The invention relates to a preparation method of nitrogen and sulfur co-doping ordered mesoporous carbon materials. According to the method, pyrrole is used as carbon sources and nitrogen sources, sulfuric acid is used as acid catalysts and sulfur sources, pyrrole oligomers are used as precursors, mesoporous silica molecular sieves SBA-15 (space group P6mm) and KIT-6 (space group Ia3d) are used as templates, a primary wet impregnation method is combined with the high-temperature themolysis technology for preparing the nitrogen and sulfur co-doping ordered mesoporous carbon materials in two-dimensional orthohexagonal and three-dimensional cubic ordered mesostructures.

A medium-temperature carbon disulfide hydrolysis catalyst and its preparation method and application belong to a catalyst for removing organic sulfur in raw material gas, and the purpose is to solve the problem that CS2 is difficult to remove compared with COS in the catalytic hydrolysis of carbon disulfide. It is characterized in that by adding catalyst modifiers ZrO2 and La2O3, a catalyst with high CS2 hydrolysis catalytic rate, anti-coking and no conversion side reactions is obtained at medium temperature, and its preparation method is that the modifier and the activity accelerator are divided into two steps Loading is done by isometric impregnation. Under normal pressure, temperature 200-400°C, space velocity 2000-8000h-1, CO volume content 0-30%, CS2 concentration less than 500mgS/m3, the carbon disulfide hydrolysis conversion rate is above 95%. It is mainly developed for medium-temperature purification of carbon disulfide in industrial gases containing carbon monoxide, and has considerable application value, economic benefits and social benefits.

The invention discloses a preparation method of a silver-supported titanium dioxide inorganic antiseptic. The method comprises the following steps: sequentially adding sodium hydroxide and ammonia water into a silver salt solution in a dropwise manner to prepare a Tollen's reagent with a certain concentration, controlling the pH value, adding the Tollen's reagent solution into a certain amount of titanium dioxide powder in a dropwise manner through an incipient wetness process, and continuously vibrating to make the powder uniformly wetted, carrying out room temperature drying, and reducing to obtain the silver-supported titanium dioxide inorganic antiseptic. The method has the advantages of simple operation, environmental protection, effective prevention of the agglomeration growth of silver particles in the subsequent processing through inducing the formation of strong interaction between diammine silver ions and the surface of titanium dioxide by adjusting the hydroxy charges on the surface of titanium dioxide via adjusting the pH value, effective guarantee of the high dispersion of the silver particles on the surface of titanium dioxide, and improvement of the antibacterial properties of silver-supported titanium dioxide inorganic antibacterial materials.

The present invention provides a methanation catalyst prepared by depositing Pt and Ru on a metal oxide carrier by incipient wetness impregnation or precipitation deposition, drying and calcining the deposited carrier to obtain a Pt—Ru/metal oxide catalyst. This catalyst can selectively catalyze methanation of CO, wherein hydrogen and CO in a hydrogen-rich reformate or synthesis gas are reacted to form methane and water, thereby the CO concentration in the hydrogen-rich reformate is reduced.

The invention discloses a nickel-based catalyst as well as a preparation method and application thereof. The nickel-based catalyst has the following structural general formula: xNi.yCeAlO3.(100-x-y) Al2O3, wherein 1<=x<=20, 1<=y<=30. The catalyst is prepared by the following steps of: firstly, impregnating dried gamma-Al2O3 in a ceric salt solution at room temperature by using an incipient-wetness impregnation method, drying and roasting at the air atmosphere to obtain a modified carrier; then impregnating the modified carrier obtained at room temperature in a nickel salt solution by using the incipient-wetness impregnation method, drying and roasting at the air atmosphere to obtain a catalyst precursor; and finally, reducing the obtained catalyst precursor in hydrogen gas at 850-1050 DEGC. The catalyst provided by the invention has the advantages of strong coke resistance, good reaction stability and heat stability, high chemical and structural stability and the like and can be usedas the catalyst for preparing synthesis gas from methane.

This invention relates to a method of preparing an iron carbide/carbon nanocomposite catalyst containing potassium for high temperature Fischer-Tropsch (FT) synthesis reaction and the iron carbide/carbon nanocomposite catalyst prepared thereby, and a method of manufacturing a liquid hydrocarbon using the same and a liquid hydrocarbon manufactured thereby, wherein a porous carbon support is uniformly impregnated with an iron hydrate using melt infiltration, and potassium is also supported together via various addition processes, including a pre-addition process of a potassium salt which is ground upon impregnation with the iron hydrate, or a mid- or post-addition process of a potassium solution using incipient wetness impregnation after impregnation with the iron hydrate. Accordingly, the highly active iron carbide/potassium/carbon composite catalyst for high temperature FT reaction in which 5˜30 wt % of active iron carbide particles are supported on the porous carbon support can be obtained and is structurally stable to heat even in high temperature FT reaction of 300° C. or more, and liquid hydrocarbons can be selectively obtained at high yields.

A preparation method of nano-gold catalysts supported on copper oxide-cerium oxide (CuO—CeO₂) and a process of preferential oxidation of carbon monoxide by oxygen in hydrogen stream with the nano-gold catalysts are disclosed. CuO—CeO₂ is prepared by either coprecipitation or incipient-wetness impregnation method, and gold is deposited thereon by deposition-precipitation. After adding CuO into Au/CeO₂, the interaction between the nano-gold and the support is increased, thereby enhancing the stability of the gold particle and the activity of the catalysts. Preferential oxidation of CO in hydrogen stream (with O₂ existing) over these catalysts is carried out in a fixed bed reactor. The O₂/CO ratio should be between 0.5 and 4. The catalyst is applied to remove CO (to lower than 10 ppm) in hydrogen stream in fuel cell to prevent from poisoning of the electrode of the fuel cell.

The invention provides a process for the production of a supported gold catalyst suitable for catalysing the oxidation of carbon monoxide to carbon dioxide. A porous support is impregnated with a solution of gold compound and with a basic solution, using an incipient wetness impregnation technique, such that gold hydroxide is precipitated in the pores of the support. The impregnation step is carried out using a compound comprising chloride. The chloride is then removed from the sample. Surprisingly, the catalyst formed by the process is effective in catalysing the oxidation of carbon monoxide to carbon dioxide at room temperature.

The invention discloses a Pt-Sn supported hydrotalcite dehydrogenation catalyst and a preparation method and application thereof. Firstly, a Mg-Al hydrotalcite carrier is prepared by an alkali precipitation method, then an incipient-wetness impregnation method is adopted to load active components of Pt and Sn, the loading capacity of Pt is 0.5-5%, the loading capacity of Sn is 0.1-2%, finally, reduction is performed by a hydrogen temperature programming part to obtain the Pt-Sn supported hydrotalcite dehydrogenation catalyst, and the reduction temperature is 250-380 DEG C. The Pt-Sn supported hydrotalcite dehydrogenation catalyst is simple in preparation process, is not involved with repeated calcining or activating, and in a cycloparaffin dehydrogenation reaction, the obtained catalyst has the advantages of mild reaction condition, high catalytic activity, high hydrogen release rate and the like, and has a good industrial hydrogen storage application prospect.

The invention discloses a high hydrothermal stability MOFs (Metal Organic Framework) catalyst, a preparation method of the MOFs catalyst, and a method for preparing a chemical product through conversion of cellulose. The catalyst takes a metal organic framework compound as a carrier, is prepared by modifying the metal organic framework compound UiO-66 through a metallic oxide, and is prepared by modifying one or more transition metals through an incipient-wetness impregnation method. The invention further discloses a process for preparing the chemical product by catalyzing hydrothermal conversion of the cellulose through one or more modified catalysts, the method comprises the processes of introducing the catalyst of the modified metal organic framework compound in a reaction kettle and preparing the functional chemical product by catalyzing the hydrothermal conversion of the cellulose. After a catalysate is separated and purified, the obtained produces are mainly the functional chemical products like furfural, cinnamyl aldehyde, lactic acid and levulinic acid.

The invention discloses a high-performance catalyst for preparation of benzene by cyclotrimerization of acetylene as well as a preparation method and an application thereof. The catalyst is a supported high-dispersion palladium, ruthenium, rhodium composite transition-metal catalyst which is prepared by using an ordered mesoporous material MCM-41 or/and SBA-15 as a carrier, the MCM-41 and SBA-15 mesoporous molecular sieve with highly ordered structures are selected as the carrier, and a step-by-step incipient-wetness impregnation method is used for preparing the supported composite palladium, ruthenium, rhodium transition-metal catalyst. Good dispersion of transition metals is formed by the ordered mesoporous material with large specific surface, and reaction performance of preparation of benzene by cyclotrimerization of acetylene is effectively improved.

The invention relates to a preparation method of a NOx adsorbent and belongs to the technical field of absorbents. Pore diameter distribution as well as a physical structure and chemical functional groups on the surface of activated carbon can be modified to a certain extent with a physical or chemical method. The activated carbon is pretreated with a nitric acid solution and an incipient-wetness impregnation method, and then cobalt nitrate and potassium nitrate are loaded on the surface of the activated carbon, so that the activated carbon has higher adsorption efficiency at 20-200 DEG C; compared with the conventional modified activated carbon, the activated carbon has more obvious adsorption effect, the NO adsorption capacity of the activated carbon can reach 59.0649 mg/g (in terms of NO), the efficiency is 90% or higher, and the activated carbon has good regeneration performance.

The present invention generally relates to a catalytic gasification of coal. Catalytic gasification of a Wyodak low-sulfur sub-bituminous coal from the Powder River Basin of Wyoming was investigated using an inexpensive sodium carbonate catalyst applied via incipient wetness impregnation. Experiments in an atmospheric pressure fixed-bed laboratory gasifier were performed to evaluate the effects of reaction temperature, feed gas steam content, and Na₂CO₃ loading on the catalytic gasification of the Wyodak coal. The temperature range investigated (700-900° C.) was selected with consideration of the Na₂CO₃ melting point (850° C.) to reduce the loss by volatilization of sodium. Sodium was found to be active during both pyrolysis and gasification steps. The catalyst was most cost-effective at addition levels of approximately 3 wt %. The random pore model provided a good fit to the conversion versus time data collected under both the catalytic and the uncatalytic conditions.

The invention discloses a cerium modified supported type nickel-based catalyst as well as a preparation method and an application thereof. In the catalyst, metallic nickel particles and metallic cerium particles are uniformly dispersed in surfaces and pore channels of titanium dioxide supporters. The preparation method of the catalyst comprises steps as follows: the titanium dioxide supporters are impregnated with a nickel nitrate and cerium nitrate mixed aqueous solution with an incipient-wetness impregnation method, dried, roasted and reduced in hydrogen stream, and the catalyst is prepared. The catalyst has lower preparation and use cost; compared with a traditional skeletal nickel catalyst, the catalyst overcomes side reactions of hydrogenated dehalogenation, addition of a dehalogenation inhibitor is not needed, selectivity of a product is high, quality of the product is good, and the catalyst can be applied to a reaction for preparing halogenated aromatic amine from haloaromatic nitrocompounds through catalytic hydrogenation.

The invention provides a high-activity hydro-cracking preprocessing catalyst and a preparing method and application thereof. The catalyst is composed of active components, carriers and aids, has the specific surface area of 160-300 m<2>/g and the pore volume of 0.38-0.60 cm<3>/g; the active components are one or more of Ni, Mo and W, the carriers are one or more of large-pore aluminum oxide, modified aluminum oxide and modified molecular sieves, and the aids are one or more of B, F and P; the hydro-cracking preprocessing catalyst is prepared through a vacuum organic complexing and dipping-microwave low-temperature activating method by placing the carriers in a dipping double cone for vacuumizing processing, loading active metal through an incipient-wetness impregnation method and finally conducting microwave heating and rapid low-temperature activating. The high-activity hydro-cracking preprocessing catalyst has the advantages of being high in activity and low in production cost.

The presently claimed invention provides a layered three-way catalyst composition for purification of exhaust gases from internal combustion engines; said catalyst comprises a first layer comprising i) palladium supported on at least one alumina component and at least one oxygen storage component; and ii) barium oxide; wherein said first layer is essentially free of strontium, and a second layer comprising: i) rhodium supported on at least one zirconia component and/or alumina component; ii) strontium oxide and/or barium oxide; and iii) optionally, palladium supported on at least one alumina component. The presently claimed invention also provides a process for preparing the layered three-way catalyst composition which involves a technique such as incipient wetness impregnation technique(A); co-precipitation technique (B); or co-impregnation technique(C). The process includes preparing a first layer; preparing a second layer; and depositing the second layer on the first layer followed by calcination. The presently claimed invention further provides a a layered three-way catalytic article in which the three-way catalyst composition is deposited on a substrate in a layered fashion and its preparation.

The invention discloses a method for preparing a titanium oxide micro-nano array supported monoatomic platinum catalyst. The method comprises the following steps: step 1, hydrothermal growth of rutiletitanium oxide nano-array on a honeycomb ceramic substrate; step 2, impregnation of the nano-array integrated honeycomb ceramic in a platinum active precursor; step 3, removal of an excess solution;step 4, microwave radiation heating and drying; and step 5, high-temperature calcination. According to the invention, the titanium oxide micro-nano array supported monoatomic platinum catalyst can beprepared on a large scale by using a microwave radiation-assisted impregnation-process needle. Moreover, the method of the invention differs from conventional incipient-wetness impregnation for depositing monoatomic platinum through heating via an oven. The deposition of monoatomic platinum on the surface of a nano-array can be shortened to a few minutes by using microwave radiation heating instead of oven heating.

The invention discloses a preparation method of an efficient sodium-based solid decarburization adsorbent. Pre-treatment including washing, roasting and grinding is conducted on a gamma aluminium oxide carrier; an incipient-wetness impregnation method is adopted, wherein the carrier is impregnated in dopant impregnation liquid with the electrolyte cation concentration of 0.1-2.0 mol/L for 6-8 hours, and then the carrier is subjected to drying, roasting and grinding for standby use; a modified carrier obtained in the last step is impregnated in an isovolumetric sodium carbonate solution with the concentration of 0.8-3.8 mol/L for 6-8 hours and subjected to drying, roasting and grinding for standby use; furthermore, a modified adsorbent is impregnated in another sodium-based amino secondaryactive component solution for 6-8 hours and subjected to drying, roasting and grinding, and finally, the target adsorbent is obtained. The adsorbent is mainly applied to thermal power plant tail smokecarbon dioxide purification, and the adsorption/desorption conditions are mild; meanwhile,the adsorbent has the advantages that the preparation method is simple, raw materials are cheap and easy to obtain, large-scale production is feasible, the adsorbent is stable in structure, all components are evenly dispersed, and the decarburization performance is efficient and stable and the like.

The invention relates to a modified zinc oxide-loaded cobalt catalyst. The catalyst consists of the following components in percentage by mass: 5 to 18 percent of Co, 30 to 45 percent of W and 36 to 48 percent of Zn, wherein other transition metal aids account for 0.01 to 15 weight percent of the total weight of the catalyst and refer to Cr, Ni, La or Ce. The catalyst is prepared by incipient-wetness impregnation. A preparation method of the invention has the advantages of realizing high-activity and high-selectivity Tropsch synthesis under the catalysis of a low-cobalt load catalyst and effectively lowering the production cost of a cobalt-based catalyst.

A method for preparing a novel W doped slag based binding material with different CeO2 loads is disclosed. Slag, as a raw material, sodium hydroxide as an activator and silica fume as a toughening agent are utilized to prepare an alkali activated slag based binding material; the prepared binding material as a carrier is utilized to synthesize a W-doped alkali activated slag based binding materialcatalyst loaded with CeO2 through an incipient wetness impregnation process, with the mechanical performance being adopted as an evaluation index. On the one hand, a novel route of high-added-value utilization of industrial solid waste is provided, and on the other hand, the prepared catalyst can be used for photocatalytic oxidation degradation of dye wastewater, and can also be used for photocatalytic reduction and decomposition of water to prepare hydrogen, thus providing a novel idea for basic research of application of solid waste based binding materials of this type. The method is of great significance for sustained development of the steel industry, wastewater treatment in the dyeing and printing industry and the field of new energy and will generate important resource, economic, environment and social benefits.