41results about How to "Lower the desorption temperature" patented technology

The invention discloses a zeolite molecular sieve-heat conducting framework composite adsorbent and a preparation method. According to the method, raw materials for preparing a zeolite molecular sieve and heat-conducting framework materials are uniformly mixed to generate reaction gel, and the zeolite molecular sieve-heat conducting framework composite adsorbent is prepared by a hydrothermal crystallization method. The porous composite zeolite molecular sieve adsorbent is synthesized by a heat-conducting framework, so that the heat transfer capability of the composite adsorbent is improved, efficient heat transfer is ensured; the problems of high desorption temperature and low mass transfer efficiency of the zeolite molecular sieve are solved, the charge capacity of the zeolite molecular sieve in VOCs (Volatile Organic Compounds) adsorption and / desorption utilization efficiency are increased remarkably; moreover, the preparation method is simple and efficient, and is suitable for industrial large-scale production.

The invention relates to a preparation method of a organic-inorganic porous composite material for absorbing carbon dioxide, which comprises the following steps: adding hydrogen-containing methyl polysiloxane into anhydrous ethanol, adding alkaline solution, mixing for 20-24 hours, adding deionized water into the solution, mixing for 0.5-5 hour(s), adding ethyl orthosilicate, mixing for 1-6 hour(s) to obtaining Solution A, dissolving organic amine into ethanol, mixing for 1-3 hour(s) to obtaining Solution B, adding the Solution B into the Solution A, mixing 3-5 hours, keeping static and agingfor 3-5 days to obtain gel, and drying the gel for 24-30 hours at the temperature of 80-100 DEG C to remove ethanol in the system, thereby obtaining the organic-inorganic porous composite material. The invention has the advantages of low desorption temperature and high adsorption capacity. Simultaneously, the invention needs no template removing agent, thereby saving the cost and achieving good thermal stability.

The invention relates to a multi-element transition metal-doped metal silicoaluminophosphate molecular sieve and a preparation method thereof, wherein the metal atoms are at least two of vanadium, copper, molybdenum, cobalt, manganese, magnesium, iron, nickel and zinc, etc., And at least one of copper, iron and nickel is contained. The high-purity product was prepared by one-step hydrothermal reaction, and its anhydrous composition can be expressed as: mR·nMe·(Si x Al y P z )O 2 , where R is the template agent in the molecular sieve, m is per mole (Si x Al y P z )O 2 Contains the molar amount of the template agent, m=0.15-0.45; Me is the metal in the molecular sieve framework, and n is each mole (Si x Al y P z )O 2 The total molar amount of contained metals, n=0.01‑0.2, where each transition metal is relative to each mole (Si x Al y P z )O 2 The ratio is between 0.0001‑0.2. The synthesized metal silicoaluminophosphate molecular sieve has excellent adsorption performance, and the catalyst made from it can be applied to olefin synthesis and SCR denitration reaction.

The invention discloses a catalyst-loaded organic-contaminated soil thermal desorption circulating medium and a preparation method thereof. Microporous ceramics are used as a circulating body, and 5-20% of Co-Ca-K@Fe is loaded. 3 O 4 catalyst. The calcium potassium cobalt composite oxide is the catalytic active component, the citric acid is the carrier complexing agent, the nano ferric oxide particles are the carrier, and the sodium lauryl sulfate is the circulating medium dispersant. Based on the quality of the carrier, the mass percentage of the catalytically active components is 5% to 15%. The iron salt, citric acid and active component precursor solution were added into the polytetrafluoroethylene hydrothermal reactor, and Co‑Ca‑K@Fe was prepared by hydrothermal, drying and roasting 3 O 4 catalyst. The circulating medium can simultaneously catalyze and oxidize organic pollutants in the process of soil thermal desorption, decompose them into water, carbon dioxide, etc., and release heat, and can be recycled during the thermal desorption process; after a period of use, the thermal medium will It is worn and broken, and the catalytic material also loses its activity and decomposes into calcium oxide, potassium salt and other beneficial components that can improve the soil.

The invention provides a carbon-based porous material and a preparation method and applications thereof. The preparation method of the carbon-based porous material includes the following steps: (A) evenly mixing carbon powder, a starter and water and then carrying out fermentation; (B) mixing the product obtained by the fermentation with water and a binder and then carrying out crosslinking and curing; (C) molding and drying the product obtained by the crosslinking and curing; and (D) carrying out carbonization and activation on the dried product. The surface of the carbon-based porous material provided by the invention is provided with the through hierarchical pore structure. Macropores sleeve meso pores, and the meso pores sleeve micropores. The content of the meso pores is high, and sothe diffusion path of organic gas molecules in the adsorption process is shortened, the rate of adsorption and desorption is accelerated, the desorption temperature is lowered, and the solving of problem of the desorption and recovery of the organic gas molecules can be benefited. The novel carbon-based porous material prepared according to the invention belongs to a low-cost and high-performanceproduct, is especially suitable for the fields of oil and gas recovery, water treatment and catalyst carrier, and has good industrial application prospects and high social and economic value.

The invention discloses an in-situ synthesis method and application of an aluminum foil-based aluminum-fumaric acid MOF adsorbent coating and a mixed solvent thereof. The method comprises: adding fumaric acid to nitrogen, nitrogen-dimethylformamide, adding aluminum salt to water, mixing the two evenly to obtain a mixed solution, adjusting the pH to be acidic to obtain a uniform acidic reaction solution; immersing the aluminum foil In the uniform acidic reaction solution, heat treatment, take out, wash, dry and activate to obtain the aluminum foil-based aluminum-fumaric acid MOF adsorbent coating. The aluminum foil-based aluminum-fumaric acid MOF adsorbent coating prepared by the invention has adjustable thickness, uniform and dense distribution on the aluminum foil, and high bonding strength with the substrate; the adsorbent coating has strong adsorption capacity, fast adsorption speed, and desorption. Low temperature, good cycle stability and so on. It can be used in adsorbent-coated substrates for air handling systems such as heating, ventilation and air conditioning (HVAC), and in adsorbent-coated aluminum foil fin heat exchangers for adsorption heat pump systems.

The invention discloses a method for utilizing surface functional group to intensify the regeneration performance of adsorption resin. The method comprises the following steps: (A), respectively adjusting the pH value of industrial waste water containing alkali organic substance to the pKb of the alkali organic substance at 25 DEG C and then carrying out filtration to eliminate suspended substances in the waste water; (B), ensuring that obtained filtrate passes through an adsorption tower filled with alkali composite functional adsorption resin; and (C), stopping adsorption when adsorption reaches a leakage point and taking dilute hydrochloric acid and dilute sulphuric acid as a desorption agent to desorb the alkali composite functional adsorption resin. The method does not influence adsorption performance and intensifies the regeneration performance of adsorption resin, thereby reducing the dosage of desorption agent, lowering desorption temperature and saving operation cost; therefore, the method is of great significance to the application and popularization of resin adsorption technology.

The invention proposes a method for processing a silicon-based substrate, comprising: obtaining a silicon wafer; chemically treating the silicon wafer to form a hydrogen passivation layer on the surface of the silicon wafer; performing a desorption process on the silicon wafer to remove hydrogen passivation layer. According to the silicon-based substrate processing method of the embodiment of the present invention, after the silicon wafer is chemically treated, a hydrogen passivation layer is formed on the surface of the silicon wafer, which can effectively protect the silicon wafer. Moreover, the desorption temperature of the hydrogen passivation layer is relatively low, thereby effectively reducing the problem of bending damage and introducing impurities caused by the high-temperature desorption of the passivation layer on the silicon wafer. Moreover, when selecting a silicon wafer, optimize the silicon Chip screening standards, thereby effectively reducing the flatness of silicon-based substrates, improving the processing quality of silicon-based substrates, and facilitating the processing of large area array devices.