7results about How to "Resolve volatile" patented technology

The invention relates to the technical field of catalyst preparation, and provides an iron-based catalyst, a preparation method and application thereof, and a method for preparing olefin from synthesis gas. The iron-based catalyst comprises 30-60 parts by mass of a carrier and 40-70 parts by mass of an active component, the active component comprises a composition of which the chemical formula is Fe100AaKbOx (Fe4N) c according to an atomic ratio; wherein A comprises at least one of Mo, W and Cr, the value range of a is 5-30, the value range of b is 1-10, the value range of c is 10-25, and x is the total number of oxygen atoms required by valence of each element in the catalyst. The iron-based catalyst provided by the invention simultaneously contains an iron oxide and an iron nitride, can be used for Fischer-Tropsch synthesis, and is beneficial to improvement of olefin selectivity; the CO conversion rate and the olefin selectivity can be further improved by limiting the ratio of iron oxide to iron nitride on the surface of the catalyst; and the method is suitable for a fluidized bed reactor, and can effectively solve the problem of difficulty in heat removal in high-temperature Fischer-Tropsch synthesis.

The invention provides a ferrierite molecular sieve catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing a first raw material system comprising an alkali source, an aluminum source, a silicon source, a composite template agent and water, and carrying out a first reaction to obtain a first material; (2) carrying out hydrothermal treatment on the first material, and then sequentially carrying out filtering, first drying and first roasting to obtain a second material; (3) carrying out ion exchange on the second material and a second raw material system containing an aqueous solution of ammonium salt to obtain a third material; and (4) mixing the third material with a third raw material system containing a binder and a solvent, and carrying out extrusion molding, secondary drying and secondary roasting to obtain the ferrierite molecular sieve catalyst. The ferrierite molecular sieve catalyst provided by the invention has high superposition reaction selectivity, high cracking catalytic efficiency and low cost.

This invention discloses a parallel-interface engineered viologen-based defective carbon nitride composite material, its preparation method, and its applications, belonging to the field of energy catalysis and photochemical materials technology. The material comprises: a defective graphitic carbon nitride support; single-atom platinum catalytic sites supported on the support; and a selenium-containing viologen compound anchored by covalent bonds in a configuration parallel to the support surface. Through a bilateral covalent bonding strategy, viologen molecules are stably anchored in a parallel configuration to the single-atom platinum-modified defective carbon nitride surface, constructing a highly efficient and stable "electron bridge" structure, significantly enhancing interfacial bonding and photogenerated electron transport efficiency. This composite material exhibits excellent photocatalytic hydrogen evolution activity and efficient coupling ability with benzylamine oxidation under visible light, and its activity retention rate reaches over 92% after 144 hours of cycling. It provides a new paradigm for solving the problem of poor interfacial stability in photocatalysts and has significant application prospects in the field of solar fuel synthesis.

The invention relates to the technical field of catalyst preparation, and provides an iron catalyst, a preparation method and application thereof, and a method for preparing olefin through carbon dioxide hydrogenation. The iron catalyst comprises an active component and a carrier in a mass ratio of (40-70): (30-60), the active component comprises a composition with a chemical formula of Fe < 100 > A K O < x > (Fe < 4 > N) < c > according to an atomic ratio; wherein A comprises at least one of Mn, Cu and Zn, the value range of a is 10-30, the value range of b is 1-10, the value range of c is 1-8, and x is the total number of oxygen atoms required by valence of each element in the catalyst. The iron catalyst provided by the invention simultaneously contains an iron oxide and an iron nitride, can be used in a reaction for preparing olefin through carbon dioxide hydrogenation, and is beneficial to improving the conversion rate of carbon dioxide and the selectivity of olefin, especially C4 + olefin; and the method is suitable for a fluidized bed reactor, and can effectively solve the problems of difficulty in heat removal, easiness in temperature runaway and easiness in catalyst deactivation in high-temperature Fischer-Tropsch synthesis.

This invention belongs to the field of SERS detection, specifically relating to a double-shell Ag-ZnAl2O4-MOF composite material, its preparation method, and its application in trace detection of organic pollutants. First, ZnAl2O4 nanoparticles are synthesized using a hydrothermal method. Then, the prepared ZnAl2O4 nanoparticles are placed into a prepared MOF growth solution to form a ZnAl2O4-MOF composite structure. Further composite with Ag nanoparticles is then formed to create the double-shell Ag-ZnAl2O4-MOF composite material. The Ag-ZnAl2O4-MOF composite substrate exhibits a synergistic effect of physical and electromagnetic reinforcement. Furthermore, due to the large specific surface area, porosity, and multiple metal sites of the intermediate MOF layer, more hot spots can be formed. The charge transfer effect generated by the composite with ZnAl2O4 produces an electromagnetic reinforcement effect. These characteristics effectively enhance the SERS signal intensity.

The invention provides an integrated hydrogen detection and strong alkali solution elimination device and method. The integrated hydrogen detection and strong alkali solution elimination device comprises a detection module for detecting the hydrogen concentration in the environment; the strong alkali solution eliminating module is used for catalytically eliminating hydrogen in an alkaline environment; the sampling and gas control module is used for collecting environment gas and controlling the flow rate of the environment gas; the control module is respectively connected with the detection module, the strong alkali solution elimination module and the sampling and gas control module, and is used for receiving the detection signal and outputting a control instruction; and the power supply module supplies power to each module. According to the invention, the detection module, the strong alkali solution elimination module, the sampling and control module and the power supply module are integrated, so that a full-closed-loop safety protection system of real-time detection, intelligent judgment and efficient elimination of hydrogen is constructed. The device realizes quick response and efficient harmless treatment on hydrogen leakage by utilizing a strong alkali solution concerted catalysis technology, has the advantages of quick response, stable operation, high adaptability and the like, and is suitable for real-time leakage prevention and control in the fields of hydrogen energy storage, chemical production and the like.

The application discloses a kind of high-temperature-resistant acid-resistant lactic acid bacteria microcapsules based on multilayer coating and a preparation method thereof, and is mainly related to the technical field of lactic acid bacteria.Compared with the prior art, the high-temperature-resistant acid-resistant lactic acid bacteria microcapsules of the multilayer coating of the application solve the problem of easy inactivation of lactic acid bacteria in high-temperature and acidic environment through the design of multilayer coating structure.The first layer of physical isolation is obtained by preparing an emulsion with lactic acid bacteria and olive oil with olive oil as the continuous phase, reducing the direct contact between the bacterial body and the outside world during subsequent processing.The outer layer wall material is made of a protective agent and sodium alginate, the protective agent is made of natural polysaccharide, citrus cellulose and tapioca starch;Citrus cellulose provides dense film formation, tapioca starch forms a gel to fill the gap when heated, and natural polysaccharide is one of inulin, pullulan and carboxymethyl chitosan.Finally, the high-temperature-resistant acid-resistant lactic acid bacteria microcapsules with good high-temperature resistance and acid resistance are obtained.