48results about How to "Avoid rapid deactivation" patented technology

The invention discloses an aromatization catalyst and applications thereof, and aims at solving the problems such as low yield of benzene and mixed xylene in the liquid outcomes and the like during the existing hydrocarbon aromatization reaction. The catalyst comprises the following components by weight percentage of 30-90wt% of molecular sieves, 0-60wt% of carriers and 10-20 wt% of adhesives, wherein the molecular sieves are mixtures of a molecular sieve I, a molecular sieve II, a molecular sieve III and a molecular sieve IV; the molecular sieve I is at least one modified HZSM-5 molecular sieve out of modified elements zinc, gallium and lanthanum; the molecular sieve II is at least one modified HZSM-5 molecular sieve out of modified elements bismuth, molybdenum, silver, copper, zirconiumand rhenium; the molecular sieve III is the HZSM-5 molecular sieve formed by modifying polysiloxane; and the molecular sieve IV is a modified hydrogenated mercerization type molecular sieve, a modified hydrogenated Beta-type molecular sieve, a hydrogenated ZSM-11 molecular sieve and a hydrogenated MCM-22 molecular or mixtures thereof.

The invention discloses a process for preparing propylene from methanol. In the process, the methanol is used as a raw material, water is used as a diluent, and a two-section type fixed bed is adopted for reaction, wherein a catalyst used in the process for preparing the propylene from the methanol is a manganese modified ZSM-5 molecular sieve catalyst. By using the process for preparing propylene from methanol, the selectivity of propylene and a P/E ratio are effectively improved, the conversion rate of raw material, namely methanol can maximally reach above 99%, and the one-path selectivity of propylene is larger than 47%.

A catalytic conversion process for increasing the light olefin yields, which comprises bringing a hydrocarbon oil feedstock into contact with a catalytic conversion catalyst in a catalytic conversion reactor including one or more reaction zones to carry out the reaction, wherein the hydrocarbon oil feedstock is subjected to the catalytic conversion reaction in the presence of an inhibitor; and separating the reactant vapor optionally containing the inhibitor from the coke deposited catalyst, wherein a target product containing ethylene and propylene is obtained by separating the reactant vapor, and the coke deposited catalyst is stripped and regenerated for recycle use by being returned to the reactor. The process can weaken the further converting reaction of produced light olefins such as ethylene and propylene to 50-70% of the original level by injecting the inhibitor; thereby it can increase the yields of the target products. When vacuum gas oil is used as the feedstock, the yield of ethylene is as high as 8.73 wt % and that of propylene is as high as 29.30 wt %, increasing by 14.4% and 26.6% respectively comparing to those obtained without the inhibitor being injected.

The invention discloses a catalyst composition for reducing the normal-to-isomer ratio of aldehyde products which are obtained through a hydroformylation reaction of olefin. The catalyst composition comprises a solvent, a catalyst active component, a cocatalyst, an assistant A and an assistant B, wherein the catalyst active component is a rhodium salt, the cocatalyst is triphenylphosphine, the assistant A is a phosphine-containing alkyl ligand, and the assistant B is indole structure-containing doped benzene. The catalyst composition is applied to hydroformylation of olefin, the normal-to-isomer ratio in the products can be reduced, and the selectivity and stability of a catalyst under the condition of a low normal-to-isomer ratio of less than 10 can be improved.

The present invention provides compositions and methods of treatment for atrial fibrillation and ventricular tachycardia. The compositions are useful for modifying the conducting properties of heart tissues in which impulses are generating and/or are useful for altering refractoriness without prolonging repolarization.

The present invention discloses a method for preparing olefins by using dehydrogenation of light alkanes with sulfur-containing substances added in raw materials, comprising: the dehydrogenation catalyst, which is a platinum group metal-supported catalyst, is not subjected to a reduction and sulfurization before use; and a small amount of sulfur-containing materials are added in the dehydrogenation raw materials for a dehydrogenation reaction directly, wherein the concentration of the sulfur-containing materials in the dehydrogenation raw materials is 5-100 [mu]mol/mol. Compared with the prior art, the method of the present invention improves the stability of the dehydrogenation catalyst, and can effectively prolong the service life of the dehydrogenation catalyst and reduce the carbon deposition rate of the catalyst, thereby improving the economic benefits of preparing corresponding olefins by using light hydrocarbon dehydrogenation.

This invention achieves a catalyst life improvement for the catalyzed vapor phase reaction of 1,1,1,3,3-pentachloropropane with hydrogen fluoride to form 1-chloro-3,3,3-trifluoropropene by introducing an oxygen co-feed into the fluorination reactor. By introduction of an oxygen co-feed to the reactor feed, the catalyst life was extended a minimum of two-fold (2×).

The present invention discloses a dehydrogenation method for light alkanes, and the method comprises: the dehydrogenation catalyst, which is a platinum group metal-supported catalyst, is reduced by using the low concentration hydrogen before use; and after the reduction, a small amount of a sulfur compound is added into dehydrogenation raw materials for the dehydrogenation reaction directly, wherein the concentration of the sulfur compound is 5-100[mu]mol/mol in the dehydrogenation raw materials. Compared with the prior art, the method of the present invention improves the stability of the dehydrogenation catalyst, and can effectively prolong the service life of the dehydrogenation catalyst and reduce the carbon deposition rate of the catalyst, thereby improving the economic benefits of preparing corresponding olefins by using light hydrocarbon dehydrogenation.

The invention discloses a method for achieving efficient biomass conversion by adopting a catalytic cracking device in a petroleum processing process. Heat generated by burning coke generated in a catalytic cracking process is used for achieving heat self sufficiency of the whole process, meanwhile, through catalytic cracking, modification of biomass pyrolytic tar is achieved, a process of converting biomass into high-quality fuel oil directly is achieved, and the catalytic cracking device is used fully, so that there is no need to build a biomass pyrolysis device individually, the productioncost is reduced, and meanwhile, the problems that during individual biomass oil catalytic cracking modification, coking is prone to happen, and a catalyst is prone to bond and aggregate can be solved.A technology involves a pyrolysis reactor, a riser reactor, a reproducer, a settler, an oil-gas separation tank and a fractionating tower, wherein the pyrolysis reactor is placed in the reproducer, and is used for biomass pyrolysis and liquefaction; a catalytic cracking reactor is used for catalytic cracking of a petroleum fraction and the biomass pyrolytic oil, and a catalytic cracking product is separated into cracking gas, gasoline and diesel fractions through the fractionating tower.

The invention discloses a method for preparing high-quality fuel oil and/or a chemical raw material from biomass pyrolysis liquid. The method comprises the following steps: carrying out hydrodeoxygenation reaction on biomass pyrolysis liquid in a catalyst full-mixed-flow circulating system in a fluidized bed reactor to obtain deoxidized oil, and carrying out hydrocracking reaction on the obtaineddeoxidized oil in a fixed bed reactor to obtain high-quality fuel oil and/or the chemical raw material. According to the method, condensation and coking of the biomass pyrolysis liquid can be prevented, the problem that a catalyst is fast to inactivate is solved, and the biomass pyrolysis liquid can be converted into high-quality fuel oil and chemical products which can be directly used by vehicles.

The invention discloses a composition for preventing hair loss and promoting hair growth and a preparation method of the composition. The composition for preventing hair loss and promoting hair growthcomprises the following materials: ethanol extract of traditional Chinese medicine, pullulan, vitamin E, hydroxypropyl methylcellulose, camphor, cocamidopropyl betaine, propylene glycol, avocado oil,hydrolyzed wheat protein, methyl isothiazolinone, menthol, preservative, L-cystine, zinc gluconate, copalic acid, xylan, water-soluble pectin and deionized water, wherein the composition for preventing hair loss and hair growth is prepared by steps of mixing, stirring and the like. According to the invention, copalic acid, xylan and water-soluble pectin are used as a reinforcing system to improvea hair loss preventing rate and a hair growth promoting rate of the composition for preventing hair loss and promoting hair growth.

An apparatus and a method are proposed, which can be used to delay a deactivation of a row address in the event of repeated access to a bank of an RLDRAM memory module.

The invention discloses a treatment method for improving activity and dispersity of active components in a cobalt-based catalyst for Fischer-Tropsch synthesis. By repeated reduction oxidation or oxidation reduction of calcined cobalt-based catalyst, dispersity of cobalt particles on the surface of a carrier can be improved. Reduction conditions in the method include: a reduction atmosphere is an atmosphere of hydrogen or mixture of hydrogen and other gases, a temperature is 200-750DEG C, a pressure is 0.1-4.0MPa, duration is 0.5-48h, and an air speed is 1000-30000mL/g/h. Oxidation conditions include: an oxidation atmosphere is an atmosphere of air or mixture of oxygen and other gases, a temperature is 200-750DEG C, a pressure is 0.1-3.0MPa, duration is 0.5-48h, and an air speed is 1000-30000mL/g/h. Compared with an untreated catalyst, the treated catalyst has advantages that CO conversion rate and higher hydrocarbon yield can be evidently increased, and catalyst stability can be improved.

A catalytic reactor constructed of a thermally conductive housing defining a reaction zone having disposed therein: (a) a plurality of catalytic elements, each comprising a porous material having a catalyst supported thereon, and (b) a plurality of heat transfer elements, each comprising a porous, thermally conductive, and essentially catalytically inactive material; wherein the plurality of catalytic elements and the plurality of heat transfer elements are disposed in an alternating configuration within the reaction zone. The catalytic reactor is useful in chemical reactions where heat transfer is a rate limiting step.

Disclosed are stable catalysts, and methods for their use, that are capable of producing an olefin from an alkyl halide. The catalysts include a phosphorus-treated silicoalummophosphate (SAPO) having a structure of X/SAPO or X/Z-SAPO, where X includes a non-framework phosphorus and Z is one or more elements from Groups 2A, 3A, IVB, VIB, VIIB, VIII, IB of the Periodic Table, or compounds thereof comprised in the SAPO framework.

The invention discloses a method for preparing fuel oil from biomass pyrolysis liquid. Unpretreated biomass pyrolysis liquid is added into a reaction area of a fluidized bed reactor under the protection of a hydrogen donor for hydrotreating. The biomass pyrolysis liquid is hydrogenated and converted into fuel oil in a catalyst full-mixed-flow circulating system fluidized bed reactor formed throughthe combined action of circulating oil, a catalyst, hydrogen and an inner component, one part of the fuel oil serves as circulating oil and returns to the fluidized bed reactor, and the other part ofthe fuel oil is discharged outwards to serve as a product. The obtained fuel oil can be mutually dissolved with fossil fuel oil in any proportion, the sulfur and nitrogen content is very low, and meanwhile, a certain proportion of oxygen is contained, so that complete combustion is facilitated, and the fuel oil is especially suitable for high-altitude areas. Meanwhile, the biomass pyrolysis liquid is prevented from being condensed and coked under heating action, the problem that a catalyst is fast inactivated is solved, coke is prevented from being formed, and the requirement for industrial long-period operation can be met.

The invention provides a cobalt-based reforming catalyst and a modifying preparation method thereof. The modifying preparation method comprises the following steps: pouring Co(NO3)2-6H2O solution into aluminum oxide to soak, thereby obtaining a catalyst precursor; and roasting the obtained catalyst precursor, grinding the catalyst precursor into particles, and reducing the particles under H2 atmosphere, thereby obtaining the cobalt-based reforming catalyst. The obtained cobalt-based reforming catalyst is finally placed into hydrochloric acid solutions with different concentrations, through the selective corrosion of the hydrochloric acid, a cobalt species which are in intermediate mutual action with an aluminum oxide carrier and show relatively high activity in stream reforming reaction are kept, metal cobalt which enables the catalyst to be quickly inactivated as steam reforming reaction easily generates side reaction is inhibited, and the cobalt-based reforming catalyst is prevented from being quickly inactivated, so that stability of the catalyst is improved.

The invention belongs to the field of preparation of catalysts, and particularly relates to a preparation method and application of a monatomic catalyst for synthesizing dimethyl 1,2-cyclohexanedicarboxylate from dimethyl phthalate. Nitrogen-doped carbon nanotubes prepared by an improved chemical vapor deposition method are used as a carrier; and the M/nitrogen-doped carbon nanotube monatomic catalyst (M=Pd, Ni, Ru) is prepared by an impregnation method. The preparation method is simple, and the M/nitrogen-doped carbon nanotube monatomic catalyst has the advantages of large specific surface area, high mechanical strength, small mass transfer limit, more uniform dispersion of metal active components on the surface of the carrier and the like, has high atom utilization rate and longer service life, and is used for hydrogenation synthesis reaction of dimethyl 1,2-cyclohexanedicarboxylate from dimethyl phthalate, and the reaction activity of the catalyst and the selectivity of the dimethyl 1,2-cyclohexanedicarboxylate are obviously improved.