40results about How to "Prevent strong interactions" patented technology

The invention discloses a preparation method of a modified alumina carrier. The method comprises the following contents: (1) kneading and compacting clay after high-temperature treatment and pseudo-boehmite and carrying out drying and low-temperature roasting on a forming material; (2) soaking the material obtained in the step (1) by using an alkali solution, carrying out sealing thermal treatment, washing, drying and roasting to prepare an alumina carrier; (3) preparing at least two polyhydric alcohol and / or monosaccharide water solutions of different concentrations and spraying the polyhydric alcohol and / or monosaccharide water solutions to the alumina carrier according to the order of the concentration from high to small; and (4) carrying out hydrothermal carbonization treatment on the alumina carrier dipped in the step (3) in a sealed container, and carrying out drying treatment to prepare the modified alumina carrier. The alumina carrier prepared through the method has a proper pore structure; meanwhile, carbon modification is carried out on a channel surface of the alumina carrier and the carbon content is in uneven distribution in the radial direction of the carrier; the carrier is suitable for the field of preparation of a heavy oil or residual oil hydrodemetallization catalyst.

The invention discloses a preparation method of high-activity hydrodemetalization catalyst for residuum. The method comprises the following steps: (1) dipping a formed alumina carrier with polyol and / or monosaccharide aqueous solution, and conducting hydrothermal carbonization treatment in a sealed container after dipping; (2) drying the alumina carrier subjected to hydrothermal carbonization treatment in the step (1), loading active components Mo and Ni, and then drying again; and (3) roasting the alumina loaded with active components obtained in the step (2) in nitrogen atmosphere, and then roasting in the air atmosphere to finally prepare the hydrodemetalization catalyst for residuum. The active components of the catalyst prepared by the method distributes uniformly on the carrier, have weak interaction with the carrier, and are easy for full sulfuration, so as to significantly improve the metal removal and desulfurization activity of the catalyst.

The invention discloses a hydrogenation catalyst, a preparation method thereof and a method for preparing o-diaminomethylcyclohexane. Described catalyst, carrier is γ-Al 2 o 3 and Mg 2 Si composite support, the active components are NiO and CuS. The catalyst can be applied to the hydrogenation of o-diaminotoluene to prepare o-diaminomethylcyclohexane, and exhibits high activity, high selectivity and high stability. The raw material conversion rate is 100%, the product yield is over 98%, and the selectivity of deamination products and secondary amine products can be suppressed. The catalyst realizes long-term operation of 5000 hours, and the activity of the catalyst does not change substantially, thereby greatly reducing the production cost.

The invention provides a preparation method of a carbon-containing alumina carrier. The preparation method comprises the following contents: (1) dipping pseudo-boehmite dry glue powder into a water solution containing polyols and / or carbohydrates, carrying out hydrothermal carbonization treatment on the dipped material, and molding, drying and roasting the treated pseudo-boehmite to obtain an alumina carrier; (2) preparing at least two polyol and / or monosaccharide water solutions of different concentration, spraying the water solutions to the alumina carrier obtained in the step (1) according to the concentration order from high to low; and (3) carrying out hydrothermal carbonization treatment on the alumina carrier dipped in the step (2) in a closed container and then carrying out drying treatment to obtain the carbon-containing alumina carrier. The alumina carrier prepared through the method has relatively large pore volume and pore diameter, the carbon content is in gradient distribution in the radial direction of the carrier, and the carrier is suitable for the field of preparation of heavy oil or residual oil hydrodemetallization catalysts.

The invention discloses a highly active flue gas desulfurization catalyst and a preparation method thereof, comprising an alumina carrier, active metals and carbon. Based on the weight of the catalyst, the active metals are calculated as oxides, and the weight content of Mo and / or W is 6.0wt %-15wt%, the weight content of Co and / or Ni is 1.0wt%-4.0wt%, the carbon is 1wt%-15wt% in element, preferably 5wt%-10wt%; the carbon content gradually decreases from the center of the catalyst particle to the outer surface . The preparation method is as follows: preparing at least two aqueous solutions of polyol and / or monosaccharide with different concentrations, spraying and dipping on the alumina carrier according to the order of concentration from high to low, performing hydrothermal carbonization treatment in a sealed container, drying, and impregnating the active group. separation, drying, and oxygen-free high temperature treatment to obtain a flue gas desulfurization catalyst. The carbon content in the catalyst of the invention is distributed in a gradient, and the active components are easy to be completely sulfurized, and the desulfurization activity of the catalyst is significantly improved.

The invention discloses a preparation method for a residual oil hydrogenation and demetalization catalyst. The preparation method comprises the following steps: dipping and molding an aluminum oxide carrier in an active metal component dipping solution containing polyhydric alcohols and / or saccharides, drying the dipped carrier, and then roasting the carrier under an inert gas atmosphere and an air atmosphere in sequence to prepare the hydrogenation and demetalization catalyst. The active components of the catalyst prepared by the method have weak interaction with the carrier and are likely to be completely vulcanized, so that the demetalization and desulfuration activities of the catalyst are obviously improved.

The invention discloses a high-activity flue gas desulfurization catalyst and a preparation method thereof. The catalyst of the invention contains a silicon-containing alumina carrier, active metal and carbon. With weight of the active metal as the benchmark, content of active metal is 5-20 wt% metered based on oxide, content of carbon is 1-15 wt% metered based on elements and content of the silicon-containing alumina carrier is 70-93 wt%. With weight of the silicon-containing alumina carrier as the benchmark, content of silica is 1-10 wt%. Specific surface area is 160-300 m<2> / g. Pore volume is 0.4-1.2 ml / g. The preparation method comprises the following steps: preparing at least two polyols and / or monosaccharide aqueous solutions with different concentrations, spraying the polyols and / or monosaccharide aqueous solutions onto the silicon-containing alumina carrier from high concentration to low concentration, carrying out hydro-thermal carbonization treatment in a sealed container, drying, immersing the active component, drying, and carrying out anoxic high-temperature treatment to obtain the flue gas desulfurization catalyst. The content of carbon in the catalyst is in graded distribution. The active component is easy to completely vulcanize. Desulfurization activity of the catalyst is remarkably raised, strength of the catalyst is high, and long-term operation can be stabilized.