摘要:
Disclosed are a beta molecular sieve, a preparation method therefor, and a hydrogenation catalyst containing same. The properties of the beta molecular sieve are as follows: the molar ratio of SiO2/Al2O3 is 30-150, the non-framework aluminum accounts for not more than 2% of the total aluminum, and the silicon atoms coordinated in a Si(OAl) structure account for not less than 95% of the silicon atoms in the framework structure. The preparation method comprises: contacting the raw material powder of the beta molecular sieve with normal pressure and dynamic water vapour, and then with ammonium fluosilicate. The beta molecular sieve of the present invention has the features of a uniform skeleton structure of silicon and aluminum, an appropriate acidity, and a reasonable pore structure, and is suitable as an acidic component of a hydro-upgrading catalyst and a hydro-cracking catalyst for diesel oil.
摘要翻译:公开了一种β分子筛及其制备方法和含有它的氢化催化剂。 β分子筛的性质如下:SiO 2 / Al 2 O 3的摩尔比为30-150,非骨架铝占总铝的不超过2%,硅原子在Si(OAl)中配位 )结构占框架结构中不少于95%的硅原子。 该制备方法包括:将β分子筛的原料粉与常压和动态水蒸气接触,然后与氟硅酸铵接触。 本发明的β分子筛具有硅和铝均匀骨架结构的特征,适宜的酸度和合理的孔结构,适合作为加氢改质催化剂和加氢裂解催化剂的酸性成分 用于柴油。
摘要:
A zeolite structure is provided which has partition walls composed of a zeolite ion-exchanged with a metal ion and forming a plurality of cells extending from one end face of the zeolite structure to its other end face and functioning as a passage of fluid and which has a honeycomb shape. The content per unit zeolite amount of the metal ion in the surface portion of the partition wall is larger than the content per unit zeolite amount of the metal ion in the inner portion of the partition wall and is preferably 1.1 to 5.0 times the content per unit zeolite amount of the metal ion in the inner portion of the partition wall.
摘要:
The invention pertains to a zeolite catalyst, methods of making same, and its use in the catalytic cracking of naphtha for the production of lower molecular weight olefins and alkanes, while minimizing production less desirable products. A zeolite is modified by base leaching and by the addition of a metal cation, thereby lowering the Si/Al2 ratio and improving the stability of the formed catalyst.
摘要翻译:本发明涉及一种沸石催化剂,其制备方法,以及其在用于生产低分子量烯烃和烷烃的石脑油的催化裂化中的用途,同时使生产不太理想的产物最小化。 通过碱浸出和金属阳离子改性沸石,从而降低Si / Al 2比例并提高形成的催化剂的稳定性。
摘要:
Disclosed are methods of forming zone coated substrates for use in catalytic converters, as well as washcoat compositions and methods suitable for using in preparation of the zone coated substrates, and the zone coated substrates formed thereby. The zone coated substrates can include a Passive NOx Adsorption zone and a catalytic zone. Also disclosed are exhaust treatment systems, and vehicles, such as diesel vehicles, using catalytic converters and exhaust treatment systems using the zone coated substrates.
摘要:
The present invention relates to a multifunctional catalyst additive composition for reduction of carbon monoxide and nitrogen oxides in a fluid catalytic cracking process comprising an inorganic oxide; alumino silicate or a zeolite; a noble metal; a metal of Group I A; a metal of Group II A; a metal of Group III A; a metal of Group IV A; a metal of Group V A; a rare earth oxide; at least a metal of Group VIII. The composition is attrition resistant and is incorporated on a support. The present invention also discloses a process for preparing the multifunctional catalyst additive composition. The present invention also discloses a fluid cracking catalyst comprising the multifunctional catalyst additive composition.
摘要:
A transalkylation catalyst for the transalkylation of a heavy reformate is provided. The catalyst includes two solid acid zeolites having different physical and chemical properties, and at least three metals selected from the group 4 lanthanthides, and the elements found in groups 6 and 10 of the periodic table.
摘要:
A method of using a catalyst comprises exposing a catalyst to at least one reactant in a chemical process. The catalyst comprises copper and a small pore molecular sieve having a maximum ring size of eight tetrahedral atoms. The chemical process undergoes at least one period of exposure to a reducing atmosphere. The catalyst has an initial activity and the catalyst has a final activity after the at least one period of exposure to the reducing atmosphere. The final activity is within 30% of the initial activity at a temperature between 200 and 500° C.
摘要:
The invention relates to a catalyst for selective synthesis of high-quality gasoline fractions from syngas and the preparation method of the catalyst. This catalyst consists of cobalt, a promoter and molecular sieve, wherein cobalt is presented in an amount of 1-30%, the promoter is represented in an amount of 0.01-5% and the balance is molecular sieve based on the weight of the catalyst. This catalyst provides superior selectivity for C5-C11 isoparaffins and relatively lower selectivity for wax-type hydrocarbons with more than 20 carbon atoms. Thereof, this catalyst can be used for the synthesis of high-quality gasoline and is good at preventing catalyst coking. Besides, the invention provides a preparation method of the catalyst.
摘要:
Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.
摘要:
An SCR catalyst including iron-containing β-type zeolite has high NOx reducing performance at a high temperature in the presence of a reducing agent, but does not have the sufficient reducing performance at a low temperature (not higher than 200° C.). A high NOx reduction rate of at least 45% at a temperature not higher than 200° C. is achieved by an SCR catalyst containing iron-containing β-type zeolite having a full width at half maximum (FWHM) on the X-ray crystal diffraction (302) plane of from 0.28 to 0.34° and a weight loss on heating to 900° C. after hydration treatment of from 15.0 to 18.0% by weight. The SCR catalyst can be manufactured by calcining iron-containing β-type zeolite at 700 to 850° C. under an atmosphere of a water vapor concentration of not more than 5% by volume.