159results about How to "Suitable for acidity" patented technology

The invention discloses a catalyst for directly synthesizing aromatic hydrocarbon by synthesis gas, which has the composition with following weight ratio: HNKF-5:aluminophosphate molecular sieve:Ga2O3:ZnO:BaO equal to 1:1-3:0.01-0.3:0.01-0.3:0.01-0.3. The invention has the advantages of simple technical process, medium catalyst acidity of aromatic hydrocarbon synthesis, better aromatization performance, and high aromatic hydrocarbon content.

The invention provides a hydrofining catalyst and a preparation method thereof. The catalyst comprises an aluminum oxide carrier which is modified by an assistant and VIII group and VIB group metal oxides which are loaded on the carrier, wherein, the assistant is at least one of boron, phosphorus, silicon and titanium compounds. The catalyst is prepared by an immersion method which is characterized in that an organic stabilizer is added into immersion fluid; the number of metal active centers of the catalyst is increased with the addition of the organic stabilizer; the physicochemical properties of the catalyst is improved by the way the aluminium oxide is modified by the assistant; therefore, the hydrofining catalyst prepared by the method in the invention has high desulfuration and denitrification activity, and is applicable to the hydrotreating process of various distillate oil, in particular to poor quality diesel oil.

The invention discloses a carbon-based rice seedling raising substrate for rice. The carbon-based rice seedling raising substrate comprises biochar, a straw fermented product, yellow soil, vermiculite and an inorganic fertilizer, wherein a volume ratio of the biochar to the straw fermented product to the yellow soil to the vermiculite is (10-20): (15-30): (25-35): (15-25); the inorganic fertilizer comprises nitrogen, phosphorus pentoxide and potassium oxide; and per 10 m<3> of the carbon-based rice seedling raising substrate for the rice comprises 12 to 18 g of a nitrogen fertilizer, 4 to 7 g of a phosphorus fertilizer and 5 to 16 parts of a potassium fertilizer. The invention also discloses a preparation method of the carbon-based rice seedling raising substrate for the rice. According to the invention, by utilizing the biochar and the fermented product which are prepared from widely-available farmland organic wastes like rice straws, and inorganic substances like the yellow soil and the vermiculite, the carbon-based rice seedling raising substrate for the rice is prepared. The substrate provided by the invention has the characteristics of fertility holding, water holding and good air permeability, and can effectively prevent the occurrences of bakanae disease, sheath blight and the like in a seedling stage.

The invention discloses an SAPO molecular sieve, which has hollow single crystals. The SAPO molecular sieve has optional pore structure, adjustable silicon content and distribution, controllable strength and density of acid site, and long service life of catalyst. The invention also discloses a preparation method of the SAPO molecular sieve. The method uses layered silicate as a raw material, which is subjected to activation, and mixed and homogenized with a phosphorus source, an auxiliary aluminum source and water to obtain a wet masterbatch; and the wet masterbatch is subjected to hydrothermal crystallization to obtain a raw powder of the hollow SAPO molecular sieve, wherein the molar ratio of Al and Si in the wet masterbatch is higher than 1. The method use easily available raw materials, has low cost and can be prepare the SAPO molecular sieve with hollow structure.

The invention comprises a combination processing method of coal tar. The method comprises the steps of: (a) subjecting a coal tar raw material to atmospheric distillation to obtain light distillate oil, phenol oil and bottom oil; dephenolizing the phenol oil to obtain the dephenolized oil; sending the bottom oil and a liquid phase from a hot high pressure separator in a step (d) into a vacuum distillation tower to obtain a heavy distillate with asphaltene removed; and conducting a hydrotreating reaction on the light distillate, dephenolized oil and the heavy distillate; (b) fractionating a liquid phase from the hydrotreating reaction into a light fraction and a heavy fraction; (c) subjecting the heavy fraction from the step (b) to a hydrocracking reaction; and (d) sending an effluent from the hydrocracking reaction into the hot high pressure separator, and sending the separated liquid phase to the vacuum distillation tower in the step (a). Compared with prior art, the method provided by the invention increases yield of light fuel production from coal tar, prolongs the service life of catalyst, and improves operation cycle of the device.

The invention discloses a catalyst for directly synthesizing aromatic hydrocarbon by synthesis gas, which has the composition with following weight ratio: HNKF-5:aluminophosphate molecular sieve:Ga2O3:ZnO:BaO equal to 1:1-3:0.01-0.3:0.01-0.3:0.01-0.3. The invention has the advantages of simple technical process, medium catalyst acidity of aromatic hydrocarbon synthesis, better aromatization performance, and high aromatic hydrocarbon content.

The invention relates to a nanometer needle-shaped SAPO-34 molecular sieve, as well as preparation and application thereof. A gel decondensation hydrothermal synthesis method is adopted and particularly comprises the following steps: (1) mixing an aluminum source, a phosphorus source, a silicon source, deionized water and a template agent, heating and stirring to obtain gel A; (2) adding excessive HF solution into the gel A, wherein the gel is decondensed into a solution at this moment; (3) performing hydrothermal crystallization: transferring the solution obtained in the step (2) into a polytetrafluoroethylene reaction kettle, performing high-temperature crystallization, rapidly cooling after the crystallization is completed, filtering and washing the obtained solid, drying and roasting to obtain the nanometer needle-shaped SAPO-34 molecular sieve. The preparation process is simple and easy to operate, and the molecular sieve has important application in methanol to olefin reaction; meanwhile, due to the special shape, the molecular sieve can serve as a carrier of catalyst active components and has potential industrial application prospect.

The invention relates to a method for preparing a mesoporous material with high hydrothermal stability by ZSM-5, which is characterized by comprising the following steps: dissolving microporous molecular sieve ZSM-5 under the condition of the existence of a template agent R; adjusting a pH value of a system by a dilute acid aqueous solution; and after the solution is separated, dried and roasted, obtaining the mesoporous material with high hydrothermal stability and long-range order. After the material is roasted, the specific surface area of the material is 400 m<2> / g to 1,200 m<2> / g, and the pore volume is 0.1 cm<3> / g to 1.3 cm<3> / g. After being refluxed for 500 hours by boiling water, the material still maintains about 80 percent of specific surface area and pore volume.