60results about How to "Reduce acid strength" patented technology

The invention relates to a selective hydrodesulfurization catalyst contains cobalt and molybdenum as active components. The selective hydrodesulfurization catalyst is characterized in that silicon oxide and aluminum oxide are used as carriers of the catalyst; based on the total weight of 100%, the catalyst comprises 2-6wt% of cobalt oxide, 9-15 wt% of molybdenum oxide, 2-8wt% of alkaline earth metal oxide, 2-6wt% of phosphorus oxide, 3-5wt% of alkali metal oxide, 2-6wt% of silicon oxide and 54-80 wt% of aluminum oxide; and the catalyst has the specific surface area of 200-300m<2>/g and the pore volume of 0.5-0.7mL/g. The catalyst has high hydrogenation activity and selectivity, good stability, low research octane number loss and high liquid yield. The catalyst is suitable for selective hydrodesulfrization of low-quality gasoline and is particularly suitable for selective hydrodesulfrization of low-quality FCC (Family Car China) gasoline.

The invention discloses a dehydrogenation catalyst and a preparation method and application thereof. The dehydrogenation catalyst uses ammonia processed alumina as a carrier, chrome as an active component, and one or a plurality of potassium, manganese, cobalt, iron, nickel, copper and zinc as an additive, the additive is loaded onto the carrier by a co-impregnation method, and taking oxide weight content in the final catalyst as a reference, the catalyst comprises 2%-6% of chromium oxide, and 0.1-5% of the additive. The preparation method of the hydrocarbon dehydrogenation catalyst comprises the following processes: using ammonia to preprocess an alumina carrier, using the co-impregnation method to load one or a plurality of potassium, manganese, cobalt, iron, nickel, copper and zinc, and loading the active component chrome. The dehydrogenation catalyst can be used in dehydrogenation of propane for preparation of propylene. The low carbon alkane dehydrogenation catalyst prepared by the preparation method has the advantages of low active component chromium oxide content, good propylene selectivity, high activity and the like.

A process for improving the acid intensity stability of solid acid catalyst containing heteropoly acid or its salt (0.5-100 wt.%) features that said heteropoly acid or its salt has central atom (P or Si) and coordinating atom chosen from W, Mo and V, and there is water in reaction atmosphere.

A support for a gas-phase oxidation catalyst, the support including a solid acid, of which acid strength (H₀) meets an inequality: −5.6≦H₀≦1.5; a gas-phase oxidation catalyst including the above support and a complex oxide containing molybdenum and vanadium as essential components, the complex oxide being supported on the support; a process for producing acrylic acid by gas-phase catalytic oxidation of acrolein with molecular oxygen, the process including carrying out the gas-phase catalytic oxidation in a presence of the above gas-phase oxidation catalyst; and a process for producing the above support, the process including controlling an acid strength (H₀) of a solid acid so as to meet an inequality: −5.6≦H₀≦1.5 by adjusting a calcination temperature in a preparation of the solid acid contained in the support.

The invention discloses a paraffin hydrocarbon shape selective isomerization catalyst, a preparation method and application thereof. The catalyst comprises a rare earth-modified molecular sieve and a halogen-modified inorganic melting-resisting oxide and at least one VIII-family precious metal, wherein the molecular sieve is a TON type molecular sieve, the weight ratio of the rare earth-modified molecular sieve to the halogen-modified inorganic melting-resisting oxide is 10:90-90:10, in the catalyst, the content of the VIII-family precious metal is 0.1-10 percent by weight, in the rare earth-modified molecular sieve, the mass content of the rare earth oxide is 0.5-60.0 percent, and in the halogen-modified inorganic melting-resisting oxide, the mass content of the halogen is 0.1-20.0 percent. Compared with the prior art, the catalyst is especially suitable for a hydroprocessing process of lubricating oil distillate, and has the characteristics of high yield of a target product, low flow point and high viscosity index.

The invention discloses an isomerization catalyst and its application. The catalyst comprises the following components by weight: 0.01%-5% of a group VIII noble metal element in the periodic table of elements, 10%-80% of rare earth modified mordenite, 0.1%-10% of an assistant, and the balance a binder with a halogen content of 0.5%-5%, as well as based on the weight of the rare earth modified mordenite, 5%-40% of a rare-earth oxide. The catalyst is used for an isomerization process of C4-C12 alkanes, has the characteristics of high catalytic activity and high iso-olefin selectivity, and can be used as a blending component for producing high octane gasoline.

The invention relates to a regeneration method of a zeolite molecular sieve catalyst to mainly solve technical problems of catalyst structure destroy and catalytic performance decrease caused by present zeolite catalyst regeneration technologies. The method, which allows the problems to be well solved through a technical scheme that the structure and catalytic performances of a regenerated catalyst are near to that of a fresh catalyst by contacting an ammonia-containing raw material with a deactivated catalyst at 100-300DEG C, can be applied to the regeneration of the zeolite catalyst.

The invention relates to a C8 aromatic hydrocarbon isomerization catalyst which comprises a rare earth-modified molecular sieve, a halogen-modified inorganic melting-resisting oxide and at least one VIII-family precious metal, wherein the molecular sieve is an EUO molecular sieve, the weight ratio of the rare earth-modified molecular sieve to the halogen-modified inorganic melting-resisting oxideis 10:90-90:10, in the catalyst, the content of the VIII-family precious metal is 0.1-10 percent by weight, in the rare earth-modified molecular sieve, the mass content of the rare earth oxide is 0.5-60.0 percent, and in the halogen-modified inorganic melting-resisting oxide, the mass content of the halogen is 0.5-20.0 percent. Compared with the prior art, the catalyst can ensure that the dimethylbenzene is isomerized and ethylbenzene is selectively transformed into paraxylene when used in C8 aromatic hydrocarbon isomerization and the concentration of the paraxylene in the catalyst in dimethylbenzene reaches or approaches a thermodynamic equilibrium value, and has high yield of the dimethylbenzene.

The invention discloses a propane dehydrogenation catalyst and a preparation method thereof. Chromium compound oxide is used as an active component, is mixed with a high-performance thermal carrier, is added with an adhesive and a modifying element, and then is mixed and kneaded, subjected to band extrusion, dried and roasted to prepare the catalyst. The propane dehydrogenation catalyst comprisesthe following components in percentages by mass: 55-80% of the chromium compound oxide, 10-30% of the high-performance thermal carrier, 0.1-10.0% of a modifying element and the balance of the adhesive. The dispersity of chromium on the carrier is improved by synthesizing the chromium compound oxide, and the effective utilization rate of the active component and the conversion rate of the raw material propane are increased effectively; by metal modification treatment, the activity and selectivity of the catalyst are improved, and then, the yield of propylene is increased; by high-temperature water vapor treatment, the acid content and the acid strength of the surface of the carrier are greatly reduced, and the coking and olefin cracking reaction of the catalyst is relived effectively; and by addition of the high-performance thermal carrier, the catalyst utilization efficiency is improved effectively, and the production load of the device is increased.

Provided are zeolite catalysts that allow reactions to proceed at temperatures as low as possible when lower olefins are produced from hydrocarbon feedstocks with low boiling points such as light naphtha, make it possible to make propylene yield higher than ethylene yield in the production of lower olefins, and have long lifetime.

The zeolite catalysts are used in the production of lower olefins from hydrocarbon feedstocks with low boiling points such as light naphtha. The zeolite catalysts are MFI-type crystalline aluminosilicates containing iron atoms and have molar ratios of iron atoms to total moles of iron atoms and aluminum atoms in the range from 0.4 to 0.7. The use of the zeolite catalysts make it possible to increase propylene yield, to lower reaction temperatures, and to extend catalyst lifetime.

The invention relates to a solid-phase synthesizing method of flaky lamellar SAPO-34. The synthesizing method includes: mixing deionized water, silicon source, aluminum source, phosphorus source, fluoride and template agent, and stirring for 5-8 hours under room temperature to obtain initial gel; aging the initial gel under room temperature for 8-12 hours, and drying the aged gel under 90-120 DEG C overnight to obtain dry gel; adding mixed liquid of water and triethylamine to the bottom of a reaction kettle, crushing the dry gel and placing into a teflon beaker, placing the beaker on the liquid in the kettle, and performing reaction under 170-200 DEG C for 2-3 days to obtain SAPO-34 molecular sieve. The flaky lamellar SAPO-34 is good in stability, high in crystallinity and good in selectivity.

The invention discloses a regeneration method of an inactivated catalyst. The catalyst comprises a TON type molecular sieve and a group VIII precious metal component. The regeneration method comprises the following steps: processing the inactivated catalyst by using an organic solvent, loading nickel on the processed catalyst according to an atom ratio of nickel to platinum of 6:1-1:1, carrying out programmed carbon burning at a temperature being not higher than 450 DEG C under the action of an oxygen-containing gas, and reducing the processed catalyst in hydrogen atmosphere; and immersing the reduced catalyst in a chitosan-containing dilute acid solution in vacuum environment or inert atmosphere, drying the immersed catalyst, and roasting the dried catalyst to obtain the catalyst with recovered activity. The method has the advantages of effective removal of carbon deposit at a low temperature, guaranteeing of no destroy to the pore structure of the catalyst, good dispersion of precious metal, and realization of very good recovery of the performances of the regenerated catalyst.

The invention discloses a catalyst modification method for improving a yield of hydrocarbons produced by catalytic pyrolysis of biomass, and belongs to the field of biomass resource conversion and utilization. The method comprises the following steps: 1, tabletting and molding a powdery HZSM-5 molecular sieve, then crushing and screening particles, 2, placing the HZSM-5 molded particles in a carrier gas atmosphere containing water vapor, and carrying out constant temperature treatment, and 3, calcining the HZSM-5 molded particles subjected to water vapor treatment in air at a constant temperature, and cooling to obtain the modified HZSM-5 catalyst. By adopting the technical scheme provided by the invention, the skeleton structure and acidity of the HZSM-5 catalyst can be adjusted, the catalytic performance of the HZSM-5 catalyst in biomass pyrolysis steam catalytic conversion reaction is improved, and compared with an unmodified HZSM-5 catalyst, the yield of hydrocarbon target productsin biomass catalytic pyrolysis reaction is effectively improved.

The invention discloses a nanometer HZSM-5 molecular sieve catalyst modified by phosphorus and a preparation method of such nanometer HZSM-5 molecular sieve catalyst modified by the phosphorus. By thepreparation method, a nanometer HZSM-5 molecular sieve and a phosphorous compound (phosphoric acid or ammonium phosphate) serve as raw materials, and the nanometer HZSM-5 molecular sieve is modifiedby equivalent-volume impregnation. The preparation method is simple, environment friendly, less in energy consumption, low in production cost, remarkable in effect and convenient to implement, popularize and apply. The nanometer HZSM-5 molecular sieve catalyst modified by the phosphorus is used for catalyzing bioethanol(the content of ethyl alcohol ranges from 50% to 90%)for propylene reaction andhas the advantages of high propylene selectivity, long service life and remarkable water-resistant thermal stability.

The invention discloses a method for in-situ synthesis of a nano Zn/Al-ZSM-5 molecular sieve with a steam-assisted dry glue conversion method. The invention belongs to the field of preparation of zeolite molecular sieve catalysts and aims to solve the problems that a conventional method for synthesizing a nano Zn/Al-ZSM-5 molecular sieve is long in crystallization time, large in energy consumption, large in molecular sieve crystal granule size and large in product waste liquid amount. The method comprises the following steps: I, weighing raw materials; II, mixing aluminum isopropoxide, a tetrapropylammonium hydroxide solution, tetraethoxysilane, zinc nitrate hexahydrate and deionized water, and carrying out vacuum drying so as to obtain a dry glue; and III, grinding the dry glue, putting the dry glue into a vessel at the upper part of a crystallization kettle, supporting the vessel by using a bracket, feeding deionized water into the bottom of the crystallization kettle, and carrying out crystallization at 160-190 DEG C, so as to obtain the nano Zn/Al-ZSM-5 molecular sieve. By adopting the method disclosed by the invention, the problem that a product is hard to separate from a mother liquid in the hydrothermal crystallization process is effectively avoided, the yield of the molecular sieve can be greatly increased, and a waste liquid with organic matters and alkalis are not generated after crystallization.

The invention provides a preparation method of a magnesium metal modified low-silicon molecular sieve material. The magnesium metal modified low-silicon molecular sieve material comprises 0.1-6% of magnesium (calculated by magnesium oxide), 5.36-20% of aluminum (calculated by aluminum oxide), 69-94.5% of silicon (calculated by silicon oxide) and 0.01-5% of alkali metal (calculated by oxide), and has a CHA type topological structure, and the specific surface (through the BET method) of the magnesium metal modified low-silicon molecular sieve material is no smaller than 565 m2/g after the magnesium metal modified low-silicon molecular sieve material is calcinated at 630 DEG C for 4 h. The preparation method of the magnesium metal modified low-silicon molecular sieve material comprises the steps that a template agent and a sodium hydroxide aqueous solution are added into an alkaline silica sol to be uniformly stirred, aluminum sulfate is added to be uniformly stirred, and chabasite crystalline phase seed crystal is added to be stirred at room temperature for 4 h to obtain uniform gel; and a product is obtained through crystallization, calcination and magnesium ion exchange, wherein magnesium ions can also be led in the molecular sieve synthesization process by one step. The molecular sieve material prepared through the preparation method has the advantages that the molecular sieve material is low in silicon-aluminum ratio, adjustable in acid center concentration, low in acid strength and high in MTO diolefin selectivity, and a large amount of ammonium chloride waste liquid does not exist in the preparation process.