430results about How to "Improve anti-coking performance" patented technology

The invention relates to a mesopore and micropore compound ZSM-5 zeolite material and mainly aims to solve the problem that the ZSM-5 zeolite material cannot contain mesopores and micropores at the same time, the problem that inactivation speed is high when the ZSM-5 zeolite material is used in the reactions such as toluene disproportionation and the like in the prior art. To solve the problems existing in the prior art, the invention adopts a technical scheme that: in the mesopore and micropore compound ZSM-5 zeolite material, the molar ratio of SiO2 to Al2O3 is 15 to 500, and the material has 0.5 to 0.6 nanometer micropores and 5 to 100 nanometer mesopores, and the pore volume of the mesopores is 1 to 10 times that of the micropores. The mesopore and micropore compound ZSM-5 zeolite material can be applied to the industrial production of conversion and treatment of aromatic hydrocarbons, such as toluene disproportionation.

The present invention discloses a modified carbon-covered alumina support with a core-shell structure and a preparation method thereof. The modified carbon-covered alumina support of the present invention is a granule with the core-shell structure. A shell of the core-shell structure is alumina deposited with carbon, and an inner core of the core-shell structure is an industrial alumina support. The modified carbon-covered alumina support of the present invention has the advantages of high specific surface area, large pore volume, high mechanical strength, and the like; the aperture distribution is more concentrated; total acid quantity is increased obviously, and strong acid quantity is reduced; the modified carbon-covered alumina support can be directly used as a catalyst during certain processes and is more applicable to be used as a catalyst support, in particular as a hydrogenation treatment catalyst support during petroleum processing course.

The invention discloses a agglomerating inhibiting agent, preparing method and application thereof. The agglomerating inhibiting agent is selected from one or more hydrogenizating upgrading products of hydrocarbon mixture of coal oil, ethylene tar oil, catalytic crackingre cycle stock, catalytic crackingre slurry oil, catalytic crackingre heavy oil, catalytic crackingre extract oil and coking hydrowax, which contain 65-100 wt% of cyclane and arene, boilingpoint is 150 DEG C to 500 DEG C. The agglomerating inhibiting agent is used for preventing, slowing and removing agglomerating of apparatus and pipilines in process of petroleum refining and petrochemical processing.

The invention discloses an alumina support containing Y zeolite and relative preparing method. The carrier utilizes the Y zeolite and alumina as carriers, while the property of zeolite can be changed via changing the metallic positive ions between the VIB group and / or VIII group to adjust the acid distribution, especially the proportion of B acid and L acid. The invention can be used a carrier of hydro-treating catalyst to fraction prepare the winter cleaning diesel fuel from poor diesel fuel.

The present invention relates to a high stability molecular sieve catalyst for preparing propylene by being converted from methanol and a preparation method thereof which mainly solve the problems of poor molecular sieve stability and water thermal stability as well as easy coking and deactivation in the prior art. The present invention adopts the technical proposal of adopting the molecular sieve raw powder with a silicon-aluminum mol ratio SiO2Al2O3 of 20 to 1000 and a weight percentage of 25 to 99.9 percent as well as at least one caking agent from SiO2, clay and Al2O3 to extrude, tablet or spray ball to shape; then treating for 1 to 8 hours by 0.1 to 3 mol / l of at least one ammonium liquor from ammonium nitrate, ammonium chloride or ammonium sulphate or 0.1 to 8.5 mol / l of at least one acid liquor from muriatic acid, nitric acid, vitriol, phosphoric acid or acetic acid under a temperature of 20 to 90 DEG C; then using 0.1 to 5 percent of at least one liquor selected from lanthanum, cerium nitrate or chloride calculated by weight percentage to treat for 4 to 8 hours under a temperature of 20 to 90 DEG C; then using steam to treat for 2 to 15 hours under the temperature condition of 400 to 700 DEG C; using a liquor of 0.1 to 3mol / l selected from at least one of oxalic acid, citric acid, phosphoric acid and maleic acid under a temperature condition of 20 to 90 DEG C to dip for 2 to 5 hours to obtain the modified molecular sieve catalyst, thus better solving the problems. The present invention can be used in the industrial production of propylene by being converted from methanol.

The invention discloses a method for preparing a vulcanized dehydrogenation catalyst. The method comprises the following steps of: preparing an La and Sn-containing aluminum oxide carrier; dipping dehydrogenation active ingredients; performing vapor dechlorination process; and injecting a sulfur-containing compound and drying the carrier to obtain the dehydrogenation catalyst. The dehydrogenation catalyst prepared by the method has the advantages of high activity stability, long service life, high regeneration and the like when used for propane dehydrogenation and is particularly applicable to a technological process for preparing the propane by the propane dehydrogenation.

The invention discloses a low-carbon alkane dehydrogenation catalyst and a preparation method thereof. The catalyst is prepared from chromium serving as an active metal ingredient, alkali metal serving as an auxiliary catalytic ingredient and chromium-containing aluminum oxide serving as a carrier, wherein the weight content of the chromium oxide in the carrier is 2.0 to 15.0 percent. In the method, the active metal ingredient, namely chromium, is introduced into the aluminum oxide carrier by partially using a kneading method and partially using an immersion method; pseudo-boehmite mixed withchromium is processed by adopting a three-step roasting method and a hydrothermal method; and thus, the porous structure and the surface character of the carrier can be improved, the content and the distribution of the active metal chromium in the carrier and the mutual effect between the active metal and the aluminum oxide are further modulated, the activity and the stability of the catalyst areimproved, the carbon depositing resistance of the catalyst is enhanced, and the service life of the catalyst is prolonged.