摘要:
Fine mesoporous silica particles are provided by which not only the functions of low reflectance (Low-n), low dielectric constant (Low-k) and low thermal conductivity but also improved strength of a molded article are achieved. The fine mesoporous silica particles are manufactured by a process including a surfactant composite fine silica particle preparation step and a mesoporous particle formation step. In the silica fine particle preparation step, a surfactant, water, an alkali and a hydrophobic part-containing additive including a hydrophobic part for increasing the volume of micelles are mixed with a silica source to thereby prepare surfactant composite fine silica particles. In the mesoporous particle formation step, the mixture is mixed with an acid and an organosilicon compound to thereby remove the surfactant and hydrophobic part-containing additive from the surfactant composite fine silica particles and provide the surface of each silica fine particle with an organic functional group. The fine mesoporous silica particles have mesopores inside each particle, and are modified on the surface with organic functional groups.
摘要:
Fine mesoporous silica particles are provided by which not only the functions of low reflectance (Low-n), low dielectric constant (Low-k) and low thermal conductivity but also improved strength of a molded article are achieved. The fine mesoporous silica particles are manufactured by a process including a surfactant composite fine silica particle preparation step and a mesoporous particle formation step. In the silica fine particle preparation step, a surfactant, water, an alkali and a hydrophobic part-containing additive including a hydrophobic part for increasing the volume of micelles are mixed with a silica source to thereby prepare surfactant composite fine silica particles. In the mesoporous particle formation step, the mixture is mixed with an acid and an organosilicon compound to thereby remove the surfactant and hydrophobic part-containing additive from the surfactant composite fine silica particles and provide the surface of each silica fine particle with an organic functional group. The fine mesoporous silica particles have mesopores inside each particle, and are modified on the surface with organic functional groups.
摘要:
The mesoporous silica particles each comprise a core particle comprising first mesopores, wherein a periphery of the core particle is covered with silica. Preferably, second mesopores, smaller than the first mesopores, are provided in the silica-covered part formed by the silica covering. The mesoporous silica particles are produced by: a surfactant complex silica particle preparation step of mixing a surfactant, water, an alkali, a hydrophobic part-containing additive and a silica source to thereby prepare surfactant complex silica particles, said hydrophobic part-containing additive including a hydrophobic part for increasing a volume of micelles to be formed by the surfactant; and a silica covering step of adding the silica source to the surfactant complex silica particles to thereby cover a periphery of each core particle with silica.
摘要:
It is an object of the present invention to provide a silica nanoparticle structure and a process for producing the same, which allow silica nanoparticles to be order-controlled to thereby make it possible to extend the application field of the silica nanoparticles ever more markedly. Silica nanoparticle structure components 2 can be prepared in which the silica nanoparticles 3 conventionally staying dispersed in a colloid solution can be converted into one-dimensionally ordered ones, and then adjacent silica nanoparticles are so firmly coupled as to be unable to disperse even if external force is applied thereto. Thus, the silica nanoparticles 3 become available for a variety of applications with the silica nanoparticles 3, conventionally staying dispersed in a colloid solution, order-controlled. Hence, the silica nanoparticle structure 1 can be provided which can extend the application field of the silica nanoparticles 3 still more markedly.
摘要:
A method of treating a cold-start engine exhaust gas stream comprising hydrocarbons and other pollutants, the method comprising: flowing the exhaust gas stream over a molecular sieve bed, the molecular sieve bed comprising an alkali metal cation-exchanged molecular sieve having intersecting 10- and 12-membered ring pore channels, to provide a first exhaust stream; flowing the first exhaust gas stream over a catalyst to convert any residual hydrocarbons and other pollutants contained in the first exhaust gas stream to innocuous products to provide a treated exhaust stream; and discharging the treated exhaust stream into the atmosphere.
摘要:
A zeolite beta according to the present invention has a SiO2/Al2O3 ratio of 10 to 16 and is aluminum-rich. The zeolite beta has a BET specific surface area measured in the state of a sodium type of 500 to 700 m2/g, a micropore specific surface area of 350 to 500 m2/g, and a micropore volume of 0.15 to 0.25 cm3/g.
摘要翻译:本发明的沸石β的SiO 2 / Al 2 O 3比为10〜16,富铝。 沸石β具有在500〜700m 2 / g的钠型,微孔比表面积为350〜500m 2 / g,微孔体积为0.15〜0.25cm 3 / g的状态下测定的BET比表面积。
摘要:
The present invention provides a method which can produce ε-caprolactam with a good selectivity by reacting cyclohexanone oxime with a good conversion in a vapor phase Beckmann rearrangement reaction. Disclosed is a method for producing ε-caprolactam, which comprises performing a vapor phase Beckmann rearrangement reaction of cyclohexanone oxime in the presence of a pentasil type zeolite, wherein the pentasil type zeolite is a zeolite obtained by subjecting a mixture containing a silicon compound, water, and a compound represented by formula (I): [(R1)3N+—(CH2)m—N+(R1)2—(CH2)m—N+(R1)3]·3/n(A) (I) wherein R1 represents an alkyl group having 1 to 4 carbon atoms, A represents an n-valent anion, m represents an integer of 5 to 7, and n represents an integer of 1 to 3, to a hydrothermal synthesis reaction.
摘要:
Provided is a process for forming catalyst metal fine particles for synthesizing a single-walled carbon nanotube by a CCVD process on a substrate, wherein a solution is prepared by dispersing or dissolving a catalyst metal salt of an organic compound or an inorganic compound in a solvent; the solution is coated on the substrate and dried; then, the substrate is heated in an oxidative atmosphere to thereby remove the solvent component remaining on the substrate by oxidative decomposition, and fine particles of an oxide of the catalyst metal are formed on the substrate; and then, the oxide of the catalyst metal is reduced in an atmosphere of an inert gas or a gas having reducing action to fix the catalyst metal fine particles on the substrate.
摘要:
The present invention discloses a gate control device which controls the passage (e.g., entry, exit, etc.) through a passageway of both authorized persons and unauthorized companions of authorized persons into a protected room. The device may be configured such that the unauthorized companions may be permitted or denied passage if the unauthorized companions are with an authorized person. For example, the device may be configured to allow an entire group of persons to enter a room if only one authorized person is present. In another example, the device may deny passage to the entire group if it contains even one unauthorized person.
摘要:
A method for producing an MTW-type zeolite, comprising (1) mixing an alumina source, an alkali source, a lithium source, and water so as to obtain a reaction mixture (2) Adding a seed crystal of an MTW-type zeolite before or while a silica source is added to the reaction mixture in a proportion of 0.1 to 20% by weight relative to the silica component in the reaction mixture. Mixing and stirring the reaction mixture. Wherein the MTW-type zeolite of the seed crystal has a SiO2/Al2O3 ratio of 10 to 500 and does not contain an organic compound. The reaction mixture has a composition represented by the following molar ratios: SiO2/Al2O3=12 to 200, Na2O/SiO2=0.1 to 0.3, Li2O/(Na2O+Li2O)=0.05 to 0.5 and H2O/SiO2=10 to 50. (3) Air tightly heating the reaction mixture, to which the seed crystal of the MTW type zeolite has been added, at 100 to 200° C.
摘要翻译:一种生产MTW型沸石的方法,包括(1)将氧化铝源,碱源,锂源和水混合以获得反应混合物(2)在MTW型沸石之前加入MTW型沸石的晶种 或者相对于反应混合物中的二氧化硅组分,以0.1至20重量%的比例将二氧化硅源加入到反应混合物中。 混合搅拌反应混合物。 其中晶种的MTW型沸石的SiO 2 / Al 2 O 3比例为10〜500,不含有机化合物。 反应混合物具有以下摩尔比表示的组成:SiO 2 / Al 2 O 3 = 12〜200,Na 2 O / SiO 2 = 0.1〜0.3,Li 2 O /(Na 2 O + Li 2 O)= 0.05〜0.5,H 2 O / SiO 2 = 10〜50 3)在100〜200℃下,将加入MTW型沸石的晶种的反应混合物气密加热