43results about How to "High conversion rate of methanol" patented technology

The invention provides a one-step synthesizing method for hollow type multilevel-hole Fe-Silicalite-1 zeolite and application thereof. The method adopts a silicon source, an organic iron source, an alkali source, a template agent and water as raw materials, and the raw materials are crystallized in a crystallization kettle, and then subjected to centrifugal separation, washing, drying and calcinating for preparing the hollow type Fe-Silicalite-1 zeolite with distributed micropores and mesoporouses . The synthesis technology is simple, and requires no multistep operation and no additional expensive additive; through adjusting the types of the iron source, the appearance and the pore size distribution of the Fe-Silicalite-1 zeolite are adjusted effectively; when used for catalyzing a methanol-to-propylene reaction, the Fe-Silicalite-1 zeolite synthesized through the invention is higher in propylene selectivity and methanol conversion rate, and longer in the service life of a catalyst.

The invention discloses a method for serially producing dimethyl ether by dehydrating solid acid catalyzing methanol, comprising the steps of: filling solid acid catalysts in a reactor section by section; arranging an inert filler layer at the upper part of each catalyst bed; and contacting cold shock materials with the solid acid catalysts after the cold shock materials pass through the inert filler layers, wherein the reaction pressure is 0.2-4.0MPa, the reaction temperature is 120-400DEG C and the feeding airspeed is 0.1-20.0h<-1>. In the invention, the solid acid catalysts are filled section by section and the temperature of a gas-phase reaction catalyst bed is controlled in a set range by using the cold shock materials; and under the condition of obtaining higher methanol percent conversion, as the temperature of the catalyst beds is controlled evenly, the side reaction is reduced and the life of the catalysts is prolonged.

A process for the ammoxidation of an alcohol feed, such as methanol, or a nitrile feed, such as propionitrile, or a mixture thereof, to form hydrogen cyanide uses a modified Mn—P catalyst having the following empirical formula:MnaP1AbOx where A=one or more of K, Ca, Mo, Zn, Fe or mixtures thereof; a=1 to 1.5; b=0.01 to 1.0 and x is a total number of oxygen atoms determined by the oxidation states of the other elements present.

The invention relates to methanol-to-gasoline catalysts, in particular to a ZSM-5 / MCM-48 composite molecular sieve, a preparation method and application thereof. The composite molecular sieve adopts a ZSM-5 microporous molecular sieve as the seed crystal, on the surface of which a MCM-48 mesoporous structure composite molecular sieve that is chemically interlinked at a mesoporous and micropore interface is obtained by overgrowth. The composite molecular sieve undergoes acidification, and then is mixed with a binder to undergo molding and roasting, and the product is used as a catalyst for methanol-to-gasoline (MTG) reaction. The catalyst provided by the invention is used for overgrowth of the mesoporous molecular sieve on the microporous molecular sieve surface, integrates the advantages of the microporous material and the mesoporous material so as to develop the strong points and avoid the weak points and reach a synergistic effect. The catalyst shows good catalytic properties to the methanol-to-gasoline (MTG) reaction, has high selectivity to gasoline products and a low aromatic hydrocarbon content, and extends the carbon chain length. More importantly, the problems of high reaction temperature, high aromatic hydrocarbon content in oil products, and limitation of hydrocarbon compounds only to less than C11 in traditional MTG technologies are solved.

The present invention provides a kind of ZSM-5 and ZSM-11 eutectic molecular sieve and its preparation method and application, and preparation method comprises the following steps: 1) silicon source, aluminum source, first organic template agent, second organic template agent, hydrogen Sodium oxide and solvent are mixed and stirred to obtain a mixed gel; 2) The mixed gel is dried and ground to obtain a gel powder; 3) The gel powder is crystallized in a hydrothermal kettle to obtain an intermediate product ; In the crystallization treatment, the pressure is 0.7-1.3Mpa, the temperature is 160-180°C, the time is 24-48h, and the mass ratio of the water in the hydrothermal kettle to the gel powder is (1-10):1; 4) Washing, drying and roasting the intermediate product to obtain ZSM‑5 and ZSM‑11 eutectic molecular sieves. The preparation method innovatively prepares a eutectic molecular sieve with a controllable ratio of ZSM‑5 and ZSM‑11 through a steam-assisted crystallization method.

The invention discloses a molecular sieve catalyst and its preparation method, and its application in the side-chain alkylation reaction of methanol and toluene. Specifically, water is added to the silicon source for dilution, and then a template agent, an aluminum source and a sodium source are added successively and each time Stir evenly after adding to obtain a liquid mixture; add a silylating agent after aging at room temperature, stir evenly and carry out a crystallization reaction under mild and constant stirring conditions, wash and filter after the reaction, and dry the obtained solid before roasting to obtain Molecular sieve catalyst precursor; the molecular sieve catalyst precursor is placed in an alkali metal salt solution for alkali metal ion exchange, and the resulting exchanged sample is filtered, dried and roasted to obtain a molecular sieve catalyst. The specific application is to use the molecular sieve catalyst on the side of methanol and toluene Styrene is produced in chain alkylation reactions. The invention changes the physical and chemical properties of the molecular sieve by optimizing the preparation conditions, and finally effectively improves the conversion rate of methanol, the selectivity and yield of styrene.

The invention relates to a catalyst for synthesizing dimethyl carbonate from methanol through oxidization and carbonylation and a preparation method of the catalyst. The catalyst is composed of CuO-CoO as active ingredients, K2O as a cocatalyst, and a ZSM-5 molecular sieve as a carrier, wherein the molar ratio of Cu to Co to K is (1.00-1.20):(0.70-0.80):(0.02-0.04), preferably 1.00:0.75:0.03. The preparation method of the catalyst comprises the steps of: mixing soluble thermally-decomposable copper salt, cobalt salt and potassium salt at the molar ratio of Cu to Co to K being (1.00-1.20):(0.70-0.80):(0.02-0.04), preferably 1.00:0.75:0.03, then adding the ZSM-5 molecular sieve, ultrasonically dispersing, filtering, drying, calcining and aging to obtain the catalyst. The catalyst has high methanol conversion rate and good dimethyl carbonate selectivity.

The invention relates to a SAPO-34 molecular sieve microsphere catalyst preparation method, which comprises: adding an aluminum source into deionized water under a room temperature stirring state, adding a phosphorus source, uniformly stirring, slowly adding a silicon source, continuously and uniformly stirring, adding a tetraethyl ammonium hydroxide solution, continuously adding one and / or a plurality of materials selected from isopropylamine, diethylamine and triethylamine after uniformly stirring to form a uniform gel, crystallizing, unloading the synthesized product mother liquor from the autoclave after completing the crystallizing, carrying out spray drying, and calcining for 1.5-2.5 h to obtain the catalyst. According to the present invention, the synthesis yield is high, the separation and the washing on the molecular sieve synthetic product are not required, and the one-time catalyst molding granulation is achieved.

The invention discloses a catalyst used in the process of preparing dimethyl ether from methanol on a fluidized bed, which is prepared by a method comprising the following steps of: uniformly mixing desalted water and a silicon-containing material, adding an aluminum-containing material and silicon aluminum phosphorus molecular sieves, uniformly mixing, adding a base material, uniformly mixing toobtain slurry, adjusting a pH value to ensure that the slurry forms a gel state, continuously stirring, pelleting by spraying so as to obtain solid microspheres, roasting, acid-washing, drying and roasting to obtain the catalyst which has the abrasion index of 0.5 to 2.0 and is used in the process of preparing the dimethyl ether from the methanol on the fluidized bed. The hollow degree of the solid microspheres can be lowered by the catalyst prepared by the method, while the catalytic activity is met, the wear-resisting property of the catalyst is obviously improved, and the abrasion index ofthe catalyst is below 2.0 and can be below 1.5 by optimizing preparation parameters; and the catalyst has high stability and long service life and is characterized by low reaction temperature, high methanol conversion ratio, high selectivity of the dimethyl ether and low cost, and the large-scale production of the dimethyl ether can be realized by the catalyst.

The invention relates to a method for producing alkene from methanol. The method is a catalyst fluidized-bed continuous reaction regeneration technology for industrialized production of alkene from methanol, and comprises that: methanol is heated to a preheating temperature by a charging system and mixed with diluted vapor, the mixture enters a fluidized-bed reactor and contacts with a catalyst for a reaction at a reaction temperature; with the reducing of catalysit activity, the to-regenerated catalyst is controlled to enter a reactivator for regeneration at a regeneration temperature and further for generation of a regeneration catalyst; and the regeneration catalyst enters the reactor and continues to participate in the reaction, and thus the cycle of the catalyst is realized, wherein the reaction temperature is 495 DEG C. The method provided by the invention helps to guarantee relatively high methanol conversion rate at a relatively low reaction temperature, and is beneficial to reducing of generation amount of coke and reaction byproducts.

The invention discloses a reforming chamber for a fuel cell system, and a fuel cell system. The reforming chamber comprises an aluminum-magnesium alloy flow field plate and a sealed end plate; the aluminum-magnesium alloy flow field plate comprises a flow field, a composite catalyst and a composite carrier; the composite carrier is formed on the surface of the flow field; the composite carrier iscomposed of aluminum oxide and magnesium oxide; the composite catalyst is formed on the composite carrier; the composite catalyst is composed of elemental copper, copper oxide, germanium dioxide and indium sesquioxide; the composite carrier is formed through electrochemical corrosion method, and the composite catalyst is formed through reaction plasma spray-coating method and cold spray-plating method. The reforming chamber disclosed by the invention has high methanol conversion rate and low CO selectivity, and further has good capacity of resisting sulfide poisoning.

The invention discloses a miniature methanol and steam reforming chamber which is made from an aluminum alloy material. The miniature methanol and steam reforming chamber comprises an aluminum alloy main body, an aluminum alloy packaging end plate and a miniature flow field structure, wherein the miniature flow field structure is used as a gas circulating channel in the reforming chamber, and located between the aluminum alloy main body and the aluminum alloy packaging end plate and on the surface of the aluminum alloy main body. One layer of porous ceramic thin film grows on the surface of a runner of the miniature flow field structure inside the reforming chamber through a micro-arc oxidation method, and a reforming reaction catalysis layer is formed on the ceramic thin film through a full-filling method. According to the miniature methanol and steam reforming chamber, one layer of porous oxide ceramic film is prepared inside the reforming chamber by applying a micro-arc oxidation technology, so that the adhesive capacity of the reforming catalyst in the miniature runner of the reforming chamber is improved, the contact area between a reactant and the catalyst is increased, and the efficiency of reaction between methanol and steam and the conversion rate of the methanol are increased.

The invention provides a catalyst for preparing methylal and methyl formate through one-step selective oxidation of methanol. The catalyst comprises the following raw material components in percentage by mass based on total mass of the raw material components of the catalyst: 10-20% of a vanadium source, 55-65% of a titanium source and 15-35% of sulfuric acid. The invention provides a catalyst for preparing methyl formate and methylal through one-step selective oxidation of methanol and a preparation method of the catalyst. The catalyst has a high methanol conversion rate, high product selectivity, long life and low-temperature fluctuation sensitivity, the product composition is easily controlled in industrial reaction, and subsequent separation is convenient.

The invention provides a ZSM-5 and ZSM-11 eutectic molecular sieve as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing and stirring a silicon source, an aluminum source, a first organic template agent, a second organic template agent, sodium hydroxide and a solvent to obtain mixed gel; (2) carrying out drying treatment and grinding treatment on the mixed gel to obtain gel powder; (3) performing crystallization treatment on the gel powder in a hydrothermal kettle to obtain an intermediate product, wherein in the crystallization treatment, the pressure is 0.7-1.3 Mpa, the temperature is 160-180 DEG C, the time is 24-48 hours, and the mass ratio of the water to the gel powder in the hydrothermal kettle is (1-10): 1; and (4)washing, drying and roasting the intermediate product to obtain the ZSM-5 and ZSM-11 eutectic molecular sieve. According to the preparation method disclosed by the invention, the eutectic molecular sieve with a controllable ratio of ZSM-5 to ZSM-11 is innovatively prepared by virtue of a water vapor assisted crystallization method.