46results about How to "Good thermal and hydrothermal stability" patented technology

A catalyst for selective catalytic reduction of NO_x having one or more transition metals selected from Cr, Mn, Fe, Co, Ce, Ni, Cu, Zn, Ga, Mo, Ru, Rh, Pd, Ag, In, Sn, Re, Ir, Pt, and mixtures thereof supported on a support, wherein the support has a molecular sieve having at least one intergrowth phase having at least two different small-pore, three-dimensional framework structures.

The invention provides a method for preparing Beta molecular sieve. The whole or parts of the aluminum sources are provided with the natural minerals such as kaolin and bentonite as raw materials and organic ammonium template is added to carry out crystallization reaction under hydrothermal condition to gain the crystallization product containing Beta molecular sieve. The gained crystallization product can use different post-processing method to prepare modification Beta molecular sieve and can be used as active constituent or carrier of the catalyst. The Beta molecular sieve prepared by the method of the invention has higher heat and hydrothermal stability, solves the problem of difficult filtering of Beta molecular sieve preparation and post-processing and can increase the production efficiency. The invention extends the range of raw materials of the compound Beta molecular sieve, finds novel purpose for more natural minerals and further lowers the cost of preparing Beta molecular sieve.

The double microporous zeolite and its preparation process belongs to the field of fine chemical technology. The preparation process is one two step crystallizing process including the first step of synthesizing Beta, and the second step of preparing composite zeolite product in BEA/FAU structure with the Beta as material and through replenishing aluminum source, regulating basicity of the system, adding guiding agent, filtering, washing, drying and roasting. The composite zeolite product has strong acidity, and excellent heat and hydrothermal stability, and may be applied as catalyst, co-catalyst and adsorbent in petrochemical industry.

This invention relates to stabilized aggregates of small primary crystallites of zeolite Y that are clustered into larger secondary particles. At least 80% of the secondary particles may comprise at least 5 primary crystallites. The size of the primary crystallites may be at most about 0.5 micron, or at most about 0.3 micron, and the size of the secondary particles may be at least about 0.8 micron, or at least about 1.0 μm. The silica to alumina ratio of the resulting stabilized aggregated Y zeolite may be 4:1 or more.

The invention relates to a preparation method and application of a normal hydrocarbon hydroisomerization catalyst. The preparation method comprises the following steps: mixing deionized water and a phosphorus source, adding an aluminum source, a silicon source and a microporous template agent, mixing evenly, then adding a mesoporous template agent, stirring to obtain sol, aging, adding a matrix, and conducting dynamic hydrothermal crystallization; washing, separating, drying and roasting the products to obtain a cascade hole SAPO-11 / gamma-Al2O3 composite; and impregnating a metal active component to the cascade hole SAPO11 / gamma Al2O3 composite material by an isopyknic impregnation method, and then airing at room temperature, drying and roasting to obtain the normal hydrocarbon hydroisomerization catalyst. The invention also provides the application of the catalyst prepared by the above method to a normal hydrocarbon isomerization reaction. The catalyst prepared by the preparation method provided by the invention has high normal hydrocarbon hydroisomerization conversion as well as excellent selectivity on double branch and multiple branch isomers.

The invention discloses a preparation method of composite zeolite with a core/shell structure, belonging to the fields of fine chemical engineering and inorganic materials. The preparation method is characterized by being a preparation method of composite zeolite taking high-silicon Y type zoelite as a core and taking nano-polycrystalline ZSM-5 zeolite as a shell. The method takes the high-silicon Y type zoelite as a raw material and obtains the product by one-step crystallization by using a conventional template. According to the preparation method, the difficulty that the conventional methods cannot synthesize the core/shell type composite zoelite which takes Y type zoelite as a core and takes ZSM-5 zeolite as a shell is solved. The shell layer is a nano-polycrystalline ZSM-5 zeolite layer, and from the shell to the core, the spreading course is unique, the spreading route is greatly shortened and a hierarchical pore structure among nanocrystals exists on the surface, so that the composite zeolite with the core/shell structure has potential application value in the aspects of catalytic cracking, hydrogen cracking and the like in the fine chemical engineering and the petrochemical engineering.

The invention discloses a preparing method of deep aluminium-stripping Y-zeolite, which comprises the following steps: adopting NH4NaY with the content of Na2O not more than 2.5w%; proceeding first water heat disposal; utilizing high-density H+ ammonium salt solution to exchange to strip aluminium; proceeding second water heat disposal; removing non-frame aluminium through acid solution; setting the disposing temperature of second water heat disposal higher than the first one; improving crystallinity and silicon-aluminium rate with abundant secondary hole.

The present application discloses a copper-containing molecular sieve Cu-CHA, a catalyst thereof and use thereof in the treatment of diesel vehicle exhaust gas, and belongs to the field of catalytic materials. The copper-containing molecular sieve Cu-CHA consists of zeolite having a CHA framework structure and containing silicon and aluminum elements as well as 1.65-3.05wt% of Cu; the Cu-CHA molecular sieve also comprises 0.5-1.5wt% of boron, and the Cu-CHA molecular sieve has an acid content of 0.25-0.98mmol/g. The Cu-CHA molecular sieve of the present application has an acid density as highas 0.25-0.98mol/g and a Cu content as low as 1.65-3.05wt%. As a catalyst for the selective catalytic reduction of ammonia, the Cu-CHA molecular sieve has excellent storage capacity for NH3 and good low-temperature activity, and the absence of CuOx species in the high-temperature section prevents the reduction of high-temperature activity due to non-selective oxidation of NH3. The Cu-CHA molecularsieve catalyst shows excellent catalytic activity in a wide temperature window, taking into account both low temperature and high temperature activities, and still shows good catalytic activity afterbeing subjected to hydrothermal aging treatment; and after being used in the treatment of diesel vehicle exhaust, the Cu-CHA molecular sieve catalyst has significant performance advantages.

The invention discloses a large block porous zeolite composed of nano-crystal grains and a preparation method thereof. The preparation method includes: taking a silicon source, an aluminum source, an alkali source, a quaternary ammonium salt template agent and sodium chloride as the raw materials to prepare gel, adding a crystal growth interference agent to prepare a blocky dry glue; subjecting the blocky dry glue and a gas template agent not in direct contact to vapor phase crystallization reaction so as to obtain the large block porous zeolite that is composed of 50-500nm primary zeolite crystal grains and has a 2-50nm intergranular mesoporous system. The porous zeolite synthesized by the method provided by the invention has improved diffusion rate and acid site accessibility, and has important application value in catalytic cracking, hydrocracking, adsorption separation and other aspects of fine chemical engineering and petrochemical engineering.

The invention provides a zirconium-containing cracking catalyst and a preparation method thereof. The catalyst comprises 10 to 40 weight percent of aluminum binding agent, 0.5 to 50 weight percent of molecular screen, 0 to 60 weight percent of clay, and 3 to 25 weight percent of zirconia. The method is characterized in that in the catalyst preparing process, the zirconium is introduced at twice. The zirconium-containing catalyst prepared by the method has the advantages of good abrasion resistance, high crystallization degree, high calcium pollution resistance, application in cracking calcium-containing hydrocarbon oil and high propylene yield.