652 results about "MCM-41" patented technology

New ionic liquid-solid-polymer mixed matrix membranes were proposed for gas separations such as CO₂ removal from natural gas or N₂. For the new mixed matrix membranes, the solids such as carbon molecular sieves, microporous molecular sieves, MCM-41 type of mesoporous molecular sieves, or polymer of intrinsic microporosity (PIM) are coated (or impregnated) with ionic liquids such as 1-butyl-3-methyl imidazolium bis[trifluoromethylsulfonyl]amide. The ionic liquids coated or impregnated solids are then dispersed in the continuous polymer matrix to form mixed matrix membranes. These hybrid mixed matrix membranes will combine the properties of the continuous polymer phase, the ionic liquids, and the dispersed ionic liquids coated or impregnated solids phase, which will possibly open up new opportunities for gas separation processes such as CO₂ separation from natural gas or flue gas.

The invention relates to a benzene hydrogenation catalyst as well as a preparation method and application of the benzene hydrogenation catalyst. The catalyst consists of an active component Ru and adjuvants, wherein the active component Ru is loaded on the catalyst by a carrier; the adjuvants are one or two of La, Ce, Fe, Zn, Cu and B, and the carrier is a mesoporous molecular sieve MCM-41 modified by one or two of ZrO2, ZnO and CuO. The invention also provides a method for preparing cyclohexene and cyclohexane by benzene hydrogenation catalyzed by the catalyst. The catalyst provided by the invention can be prepared by a dipping sedimentation method or a chemical reduction method and has a higher catalytic activity and cyclohexene selectivity.

The invention discloses a preparation method for a mesoporous-microporous composite hydroisomerization dewaxing catalyst. The invention relates to a mesoporous-microporous composite molecular sieve. The composite molecular sieve with a core-shell structure is formed by compounding with microporous ZSM-23 as a core and a mesoporous molecular sieve MCM-41 or SBA-15 as a shell in a manner of eutecticuming, wherein internal and external proportions and acidity of the molecular sieve are adjustable. The hydroisomerization dewaxing catalyst prepared by using the composite molecular sieve with the core-shell structure as a carrier through an excessive impregnation method has moderate acidity, can adjust the relative content of the composite molecular sieve in the catalyst according to the needs for acidity, has high noble metal dispersity, and is especially applicable to hydroisomerization reactions of long-chain n-alkanes and raw materials with high wax content. The obtained lubricant base oil has low pour point and high yield, and shows high isomerization reaction activity and selectivity, wherein the isomeric selectivity is larger than 93% on the premise that the conversion rate is 97%, and especially, the isomeric selectivity of multi-branched alkanes is significantly increased and is larger than 58%. The preparation method provided by the invention has the advantages of simple operation and good reproducibility.

A smoking article includes a filter element having MCM-41 as a mesoporous molecular sieve. Also, a smokable article includes a smokable material and a wrapping paper having MCM-41 as the mesoporous molecular sieve. The mesoporous molecular sieve may be used in combination with charcoal or impregnated with copper oxide to further enhance filtration.

The invention provides a novel method for preparing a low-mercury catalyst applied to a reaction for preparing chloroethylene from acetylene. In the method, various molecular sieves such as 13X, MCM-41 are respectively adopted as carriers, an active component mercuric chloride is loaded on the carriers, various metal compounds serving as aids are added in the preparing process, and finally the novel catalyst is obtained by drying. The method is characterized in that: the molecular sieves are adopted as the carriers for preparing the catalyst, the process is simple, the production cycle is short, the used raw materials are safe and environment-friendly, and the required equipment has low cost. The molecular sieves are adopted as the carriers, and the mercuric chloride and other aids can enter pores of the molecular sieves and be on skeletons of the molecular sieves, so the active component is firmly combined with the carriers, and the prepared catalyst has long service life and high stability.

The invention relates to a load type metal mesoporous molecular sieve noble metal catalyst and a preparation method thereof. The preparation method comprises serving a complex which is formed by long-chain surfactant molecules and a metal complex as a template agent, producing a metal platinum doped molecular sieve Pt-MCM-41 by a hydrothermal crystallization method after a silicon source is added and uniformly fixing metal platinum in molecular sieve frame lattices in the process; washing and drying a sample after crystallization and directly reducing the sample in the hydrogen; removing the residual surfactant through low temperature after-treatment to obtain a required sample. According to the load type metal mesoporous molecular sieve noble metal catalyst and the preparation method thereof, the prepared catalyst comprises a regular mesoporous structure, active site centers are distributed in a highly ordered mode, the specific surface area and the pore volume are large, the thermal and hydrothermal stability is good, and the catalyst can serve as a catalytic oxidation, catalytic cracking and catalytic isomerization catalyst.

The invention discloses a method for synthesizing a composite molecular sieve by a microwave method and catalytic performance application thereof. In the method for preparing the composite molecular sieve by the microwave method, kaolin is taken as a raw material, inorganic silicate is taken as an additional silicon source, and the prepared composite molecular sieve is applied to the alkylation reaction of phenol and tertiary butanol. The method comprises the following steps of: adding a certain amount of sodium silicate into the kaolin serving as the raw material to synthesize a Y type molecular sieve precursor; and preparing a composite molecular sieve Y/MCM-41 by the microwave method by using hexadecyl trimethyl ammonium bromide serving as a template. The synthesized molecular sieve has two pore structures, namely micropores and mesopores; the specific surface area of a sample is more than 550 m<2>/g; the average pore size is roughly 2.7 nm; and the sample has a regular and ordered hexagonal pore structure. The synthesized molecular sieve has good catalytic effect on the alkylation reaction of the phenol and the tertiary butanol, and particularly the selectivity of 4-tertiary butyl phenol is up to 86.3 percent.

The invention aims at providing a carboxylated MCM-41 mesoporous molecular sieve for adsorbing heavy metal ions (such as copper, chromium, lead, cadmium, cobalt, nickel, zinc, ferrum, mercury, silver, barium and the like) in waste water, and a preparation method thereof. The carboxylated MCM-41 mesoporous molecular sieve is characterized in that a mesoporous molecular sieve MCM-41 is utilized as a supporter; the surface of the carboxylated MCM-41 mesoporous molecular sieve contains organic functional groups (-COOH groups); the organic functional groups can undergo a coordination reaction or a chelation reaction with transition metal ions to produce an effective preferential adsorption effect. The carboxylated MCM-41 mesoporous molecular sieve has the advantages of extremely high specific surface area, regular pore canal structure, and uniform distribution of organic functional groups on the pore surface. The carboxylated MCM-41 mesoporous molecular sieve has a high adsorption capacity for heavy metal ions in waste water. The preparation method has the advantages of simple process, moderate reaction conditions, easy operation, good reappearance, environmentally friendly characteristics and good application prospects.

The present invention belongs to the field of chemical engineering technology. It relates to a new catalyst for preparing 1,4-butanediol by utilizing hydrogenation of dimethyl maleate. Said invention uses mesopore molecular sieve MCM-41 as carrier and impregnates it with Cu salt solution to prepare catalyst precursor, then the precursor is calcined so as to obtain the invented Cu/MCM41 catalyst. Said catalyst has higher activity and higher 1,4-butanediol selectivity.

An MCM-41 catalyst having a crystalline framework containing SiO₂ and a Group IV metal oxide, such as TiO₂ or ZrO₂ is provided. The catalyst is low in acidity and is suitable for use in processes involving aromatic saturation of hydrocarbon feedstocks.

The present invention relates to a composite catalyst for preparing sec-butyl acetate by direct esterification of ethyl ester and butylene, which takes heteropoly acid as the catalyst active component and porous carrier as the dispersant; the weight proportion of the heteropoly acid and the porous carrier is 0.01:1 to 10:1. The heteropoly acid is one with Keggin structure, which consists of phosphotungstic acid, silicotungstic acid, germanium tungstic acid, arsenowolframic acid, phosphomolybdate, germanomolybdate or arsenicomolybdate. The porous carrier comprises porous SiO2, Al2O3, SBA-15, MCM-41, white carbon black, porous SiC, corallite, andalusite, cordierite, meerschaum, Attapulgite or kaolin. The composite catalyst of the present invention solves the problem that the catalysis efficiency is low if the heteropoly acid is separated out from the reaction system.

The invention discloses a CsPW/Zr-MCM-41 catalyst prepared in a supercritical CO2 environment. The preparation method comprises the following steps: Zr-MCM-41 is taken as the carrier, and 10-60% of Cs modified salts is loaded by adopting the supercritical CO2 impregnation technology; with the utilization of the catalyst, the glycerin conversion rate reaches 65.2-100%, the acrolein selectivity reaches 56.8-85.4%; the invention further discloses application of the CsPW/Zr-MCM-41 catalyst to preparation of acrolein through glycerol selective dehydration. Compared with the prior art, the catalyst prepared by adopting the preparation method has the advantages that the dispersion degree of Cs modified salt on the carrier is high, the acting force between the Cs modified salt and the carrier is strong, the hydrothermal stability is high, the acidity loss possibility is low, and meanwhile, when compared with the conventional product, the obtained product is high in glycerin conversion rate and acrolein selectivity, and long in service life.

The present invention is one kind of composite organic-inorganic material film as immobilized cell carrier. The composite organic-inorganic material film is prepared through adding alumina precursor, such as boehmite, pseudo boehmite, mesoporous molecular sieve MCM-41, etc to polymer material, such as foamed polyurethane, sodium alginate, PVA, etc. for modification. It is superior to traditional immobilized cell carrier material, and has unique pore canal structure for microbe cell to habitat and to propagate. It has coating and adsorbing amount up to 3-6 billion/ml and free fermenting cell up to 0.08-0.16 billion/ml, and may be used for immobilized cell, especially alcohol fermentation to shorten fermentation period and raise alcohol yield. It has the features of high permeability, high mechanical strength, high chemical stability and capacity of being reused, and is one kind of high efficiency immobilized cell carrier.

The invention provides a catalyst for reaction of preparing aviation kerosene by castor oil through hydrogenation and a preparation condition of the catalyst. Modified MCM-41, SBA-15 and the like are used as the carrier of a hydro-de-oxygenation catalyst, and one selected from Ni, Ni2P, Co, CoP and Pt is used as an active component; modified SAPO-11, SAPO-34 and the like are used as the carrier of a hydrogenation isomerism catalyst, and one or two selected from Ni, Ag, Pd and Ru is/are used as the active component; the catalyst for the action of preparing the aviation kerosene by the castor oil through a one-step method is characterized in that with one or more selected from modified USY, a beta-type molecular sieve, an X-type molecular sieve and ZSM-5 as the carrier and Ni and Cu as active components or Ni2P and Cu3P as the active components, under a proper reaction condition, the aviation kerosene which meets the need of the operation conditions is prepared.

The invention involves a load palladium amorphous alloy catalyst used for nitrophenol hydrogenation and preparation method and belongs to catalyst technology field. Said catalyst uses NaY, MCM-41, molecular screen, Al2O3, TiO2, SiO2 or MgO as carrier, and is loaded with Pd-B amorphous alloy, the quality of Pd is 0.1-0.5% of toatl quality of catalyst. The preparation process includes ultrasonic dispersion, vacuum impregnation, KBH4 chemical reduction under vacuum conditions, filtration and washing of carriers; it is characterized by introducing vacuum and ultrasonic radiation conditions. The advantages of the invention lies in its high activity of catalyst, low preparation cost and simple preparation process, it could widely apply to the preparation of p-aminophenol through nitrophenol catalysis and hydrogenation.

The invention relates to application of a supported heteropoly acid catalyst in production of methyl methoxyacetate by methylal vapor-phase carbonylation. The catalyst is prepared by an isometric impregnation method, and uses at least one of activated carbon, TiO2, Al2O3, SiO2, SBA-15, MCM-41 and zeolite molecular sieve as a supporter, wherein the heteropoly acid accounts for 0.1-50 wt% of the supported heteropoly acid catalyst. When being used for the reaction for producing methyl methoxyacetate by methylal vapor-phase carbonylation, the catalyst has the characteristics of mild reaction conditions and high catalytic efficiency; and since no solvent is used in the reaction, the product and catalyst can be easily separated, thereby being beneficial to large-scale industrial production.

The invention relates to an improved MCM-41 mesoporous molecular sieve and a preparation method thereof, in particular relates to a dual-metal-atom improved MCM-41 mesoporous molecular sieve and the preparation method thereof. The molecular sieve consists of hexadecyl trimethyl ammonium bromide, ethyl orthosilicate, sodium hydroxide, Me metal salt (Co, Ni, Cr, Fe, Cu, V), lanthanum nitrate and water. The molecular sieve is prepared in the steps: at the room temperature, hexadecyl trimethyl ammonium bromide is mixed and dissolved with the sodium hydroxide, and is added with TEOS in dropping way, and simultaneously added with Me metal salt water solution and lanthanum nitrate solution in dropping way; the pH value of the mixed solution is adjusted by acetic acid to be 10 to 11, and is mixed for 1 to 2 hours after being stabilized; the sol is moved into a polyfluortetraethylene bottle to be heated and crystallized for 2 days in the oven at the temperature of 100 DEG C; after filtering, washing and drying for nights, and being calcined in a muffle at the temperature of 550 DEG C for 3 to 7 hours, the dual-metal-atom improved MCM-41 mesoporous molecular sieve is obtained. The product can simultaneously improve the acid performance and the water heating stability of the MCM-41 mesoporous molecular sieve, and can enlarge the actual application of the MCM-41 mesoporous molecular sieve in the catalyst filed.

The present invention belongs to the field of molecular sieve material synthesizing technology, and is especially method of synthesizing aluminum MCM-41 mesoporous molecular sieve with metakaolin as material. The mixture one metakaolin, Si source, water, template agent, etc. is first prepared into gel and then prepared into Al-MCM-41 mesoporous molecular sieve with different Si/Al ratio through hydrothermal reaction at 100-160 deg.c. The prepared molecular sieve has high specific surface area, high pore volume, thick pore wall, high thermal stability, high acid amount in molecular sieve skeleton, high acidity and low cost.

A catalyst for preparing dimethylether from the liquid phase or gas-liquid mixture of methanol by dewatering is composed of adhesive (5-50 Wt%) and the molecular sieve (50-95 Wt%) chosen from ZSM-5, ZSM-11, Y, mordenite, beta-zeolite, MCM-22, MCM-41, MCM-56, MCM 49, SAPO-5 and SAPO-34 molecular sieves, especially the MCM-22 one.