89results about How to "High dehydrogenation activity" patented technology

Disclosed is a method for producing 1,3-butadiene through oxidative dehydrogenation of normal-butene using a parallel reactor in which catalysts are charged into fixed bed reactors and are not physically mixed. More specifically, disclosed is a method for efficiently producing 1,3-butadiene through oxidative dehydrogenation of normal-butene using the parallel reactor containing multi-component bismuth molybdate-based catalysts exhibiting different activities to oxidative dehydrogenation for normal-butene isomers (1-butene, trans-2-butene and cis-2-butene), and butene separated from a C4 mixture containing normal-butene and normal-butane, as a reactant.

The invention relates to a catalyst for storing hydrogen by an organic matter carrier and a preparation method of the catalyst. The catalyst comprises the following components in percent by weight: 0.15-5 percent of metal active component, 0.1-4 percent of additive, 2-5 percent of adhesive and the balance of carrier. The carrier containing a rare earth metal is prepared by adopting a hydrothermal reaction and then immersed in an active metal water solution, then dried and roasted, and then mixed with the adhesive to obtain the catalyst. Compared with the prior art, the catalyst has the characteristics of proper acid strength, high reaction activity, good selectivity and the like; and the rare earth metal is added, the dispersion degree of the active metal can be increased, surface carbon deposit of the catalyst is reduced, thus the service life of the catalyst is prolonged.

The invention relates to a catalyst for dehydrogenation of C16-C19 long chain normal alkanes and a preparation method and application thereof. The catalyst comprises the following components in percentage by weight: 0.2 to 0.5 percent of platinum, 0.4 to 2.0 percent of tin, 0.1 to 2.0 percent of iron, 0.4 to 2.0 percent of potassium and the balance of large-pore strip alumina with dual-pore distribution; and the catalyst is used in a reaction for the dehydrogenation of C16-C19 long chain normal alkanes to prepare monoolefine, the conversion rate is 11.4 percent, and the selectivity is 91.9 percent; the catalyst can undergo C16-C19 catalytic dehydrogenation reaction for a long time; and alkylbenzene sulfonate synthesized by dehydrogenized products can have ultra interfacial tension in a wide alkali concentration range for oil-water in actual oil field, and compared with the oil displacement performance of a byproduct of C10-C13 alkylbenzene, namely heavy alkylbenzene sulfonate, the alkali concentration is shifted to the low-concentration direction, and the interface activity of a sample is better.

The invention provides an aluminum oxide carrier and a preparation method and application thereof. The aluminum oxide carrier has a diameter of 0.5-3.5mm and a specific surface area of 40-200m<2>/g, and holes in diameter of 15-20nm accounts for total hole quantity by 90% or more. The preparation method of the aluminum oxide carrier includes steps: (1) aluminum oxide sol preparation; (2) adding a pore-enlarging agent and/or a gelatinizing agent into aluminum oxide sol to form a precursor, and subjecting the precursor to thermal treatment and molding; (3) drying formed aluminum oxide at 100-150DEG C, heating to 950-1120 DEG C by a heating rate of 1-5 DEG C/min, and keeping the constant temperature for 6-10h to obtain the aluminum oxide carrier, wherein in a heating process, sequentially keeping the constant temperature for 1-10h in four temperature ranges of 200-300 DEG C, 400-500 DEG C, 600-700 DEG C and 800-900 DEG C. The aluminum oxide carrier prepared according to the method has a great and stable porous structure, is concentrated in pore distribution and uniform and controllable in pore diameter and has advantages of high specific surface area, large pore volume and high anti-crush strength.

The invention discloses a KL molecular sieve loaded monatomic Pt and PtxFe cluster structure catalyst and a preparation method and an application thereof. The KL molecular sieve loaded monatomic Pt and PtxFe cluster structure zeolite catalyst is prepared by means of advanced atomic layer deposition equipment which is high in controllability. Pt can be controlled to coexist with PtxFe (x is greaterthan 8 but less than 13) in a monatomic form and the two are highly dispersed in pores of a molecular sieve, so that contact between Pt and Fe is improved greatly. The catalyst can improve the utilization ratio of the active center of Pt greatly, the aromatization process of alkane is facilitated as a result of different structure forms of PtxFe, Pt in the monatomic form is an effective active center in a dehydrogenation process of alkane, and an intermediate specie after dehydrogenation finishes the aromatization process in the PtxFe cluster, so that the selectivity of alkane is improved greatly and the side reactions are reduced.

The invention relates to a preparation method of a catalyst for preparing propylene by propane dehydrogenation. The Group IV metal-Group III metal bimetal combination is used as an aid, a platinum group metal is used as the dehydrogenation active component of the catalyst, and formed alumina is used as the support. The preparation process of the catalyst comprises the following steps: introducing the alumina support into the Sn-Al aid by co-impregnation so that the Sn is dispersed in the support more uniformly on the atom level, thereby enhancing the acting force between the Sn and alumina support; impregnating the Sn-Al-containing alumina support with the dehydrogenation active component to enhance the interaction force among the metal, aid and support; and finally, carrying out drying roasting, dechlorination, alkali metal aid impregnation, dilute hydrochloric acid impregnation, vulcanization and other after-treatments to finally obtain the dehydrogenation catalyst. The catalyst can be used for low-carbon alkane dehydrogenation reaction and especially propane dehydrogenation reaction, and has the advantages of high activity, favorable selectivity, favorable stability and the like; and especially, the selectivity and stability are obviously enhanced.

The invention relates to a method for removing hydrogen through selective oxidation of a CO gas mixture, mainly solving the technical problems of low hydrogen removal rate and high CO loss rate in the prior art. The invention adopts the following technical scheme: the CO gas containing hydrogen is utilized as the raw material, and the raw material is contacted with noble metal catalysts under the following conditions: the reaction temperature is 80-260 DEG C; the volume space velocity is 100-10000h-1; the molar ratio of oxygen to hydrogen is 0.5-10:1; and the reaction pressure is -0.08-5.0MPa, and the hydrogen in the raw material is oxidized into water, wherein the noble metal catalysts include (a) at least an active component from platinum metals; (b) at least an auxiliary agent from alkali metals, alkaline-earth metals, IB, IIB, VB, VIIB, VIII, IIIA, IVA or lanthanides; and (c) a layered composite carrier formed by the kernel of an inert carrier and a porous coating material shell combined with the kernel. The technical scheme better solves the problems and can be used in the industrial production for removing hydrogen through selective oxidation of the CO gas mixture.

The invention discloses a supported type high-selectivity bimetallic catalyst with a core-shell structure as well as a preparation method and application thereof. An SBA-15 is taken as a supporter, Ptis taken as an active ingredient, 3d transition metal is taken as an aid, and the 3d transition metal and Pt define the bimetallic catalyst with the core-shell structure, wherein on one hand, intranuclear 3d metal is added, so that the d belt center of the surface Pt atom is reduced, and adsorption on propylene is weakened, and therefore, selectivity on propylene is improved, on the other hand, 3d transition metal is added, the dosage of Pt can be reduced, reduction of Pt is realized, and utilization of Pt is more efficient. The catalyst is suitable for hydrogen atmosphere, has very good effect on propylene prepared by propane dehydrogenation, has very high dehydrogenation activity under a high-temperature condition, has overall selectivity of 85% on propylene, and realizes very high propylene selectivity.

The invention discloses a propane dehydrogenation catalyst and a preparation method thereof. The propane dehydrogenation catalyst adopts CaO-Al2O3 composite oxide balls as a carrier, adopts metal Pt as an active component, and adopts Sn and Bi as additives; by adoption of the mass of the catalyst as a reference, the content of the metal Pt is 0.1-1.0wt%, the content of the Sn is 0.1-2.0wt%, the content of the Bi is 0.1-1.0wt%, the content of CaO is 1.0-5.0wt% and the rest is Al2O3. The propane dehydrogenation catalyst and the preparation method disclosed by the invention have the beneficial effects that the catalyst is prepared by adopting a coprecipitation process and can ensure heat stability and enough specific surface area and pore volume of catalyst carriers; the reaction property andanti-carbon-deposition capability of the catalyst are excellent; the dehydrogenation activity of the catalyst is very high under a high-temperature condition, the propylene selectivity can reach 90%or more, and the stability is good.

The invention relates to a method for activating a light alkane dehydrogenation catalyst. The method mainly solves the problem that the conversion rate and selectivity of the existing platinum-containing light alkane dehydrogenation catalyst are low. The method comprises a) carrying out grading treatment on the catalyst in an air atmosphere, b) treating the catalyst containing 1 to 10mol% of O2 and 1 to 10mol% water vapor flows to promote redispersion of an active metal component Pt and a halogen Cl, and c) reducing the active metal component at 450 to 650 DEG C in a trace hydrogen sulfide/H2 reduction atmosphere so that the deactivated catalyst is completely activated. The method solves the problem and can be used in industrial production of light alkane dehydrogenation.

The invention discloses a preparation method and application of a light alkane dehydrogenation catalyst with high thermal stability. The light alkane dehydrogenation catalyst with high thermal stability is a PtSn load-type catalyst which uses Si-containing gamma-Al2O3 pellets as a carrier, and the catalyst also contains rare-earth metal elements, alkali metal elements and/or alkaline earth metal elements as auxiliaries; an element Si in the Si-containing gamma-Al2O3 pellet carrier accounts for 0.1-30 percent by weight; based on the weight of the Si-containing gamma-Al2O3 pellet carrier, the content of an element Pt loaded on the carrier is 0.3-0.5 percent by weight, the content of an element Sn is 0.6-1.0 percent by weight, the content of the rare-earth metal elements is 0.8-1.0 percent by weight, and the content of the alkali metal elements or the alkaline earth metal elements is 0.2-1.0 percent by weight. The catalyst is suitable for being used under light alkane dehydrogenation process conditions such as high temperature, long time and multiple regeneration, and is high in light alkane conversion rate and stability.

The invention belongs to the technical field of preparation of oxygen carriers, and relates to a preparation method of an oxygen carrier for producing propylene through propane chemical-looping dehydrogenation. The preparation method includes dipping aluminium oxide into precursor aqueous solution containing manganese to obtain an aluminum oxide oxygen carrier, loading a certain quantity of manganese-base active component, adding in clay and a binder into the oxygen carrier to improve wear resistance of the oxygen carrier, further, loading lithium oxide active component to the carrier so as toobtain oxygen carrier particles for producing propylene through propane chemical-looping dehydrogenation. The preparation method is simple in process; the oxygen carrier cannot cause environmental pollution in preparation and recycling process; the prepared oxygen carrier has high dehydrogenation activity, high propane conversion rate and high prpylene selectivity.

The invention relates to a high-activity catalyst used for hydrogen production by dehydrogenation of an organic hydrogen storage compound and reduced in noble metal consumption, and a preparation method thereof. The catalyst comprises Pt, a non-noble metal active component, aluminum oxide and modified metal oxide, wherein the modified metal oxide is titanium oxide and/or zirconium oxide; and the value of eta of the modified metal oxide is less than 0.3, the value of theta of the modified metal oxide is greater than or equal to 5, the value of eta is equal to a ratio of the weight percentage ofa crystalline phase modified metal oxide in a carrier composition to the chemical composition weight percentage of the modified metal oxide in the carrier composition, and the value of theta is equalto a ratio of the weight percentage of the modified metal oxide on the surface of the carrier composition to the chemical composition weight percentage of the modified metal oxide in the carrier composition.. The preparation method comprises the following steps: preparing the carrier composition containing the aluminum oxide and the modified metal oxide, conducting dipping and then performing roasting. The catalyst has high dehydrogenation activity and selectivity under the condition that noble metal consumption is reduced.

The invention relates to a preparation method of a catalyst for preparing olefin by dehydrogenation of low-carbon alkane, which takes bimetal combined by group IV element metal and transition metal as an auxiliary agent, platinum group element metal as an active component for dehydrogenation of the catalyst, and transition metal spinel as a carrier. The preparation process of the catalyst comprises the following steps: introducing group IV element metal and a transition metal additive into a transition metal spinel carrier by adopting a co-impregnation method, so that group IV element metal atoms are more uniformly dispersed in the carrier at the atomic level, and meanwhile, the acting force between the group IV element metal atoms and the transition metal spinel carrier is enhanced; then dipping a dehydrogenation active component on a transition metal spinel carrier containing group IV element metal and a transition metal auxiliary agent, so as to improve the interaction force among the metal, the auxiliary agent and the carrier; and finally, drying, roasting, dechlorinating, dipping in an alkali metal additive, dipping in diluted hydrochloric acid, vulcanizing and the like to obtain the dehydrogenation catalyst. The catalyst provided by the invention has the advantages of high conversion rate, high olefin yield, good catalyst stability and the like.

The invention relates to the field of catalysts, and discloses an isobutane dehydrogenation catalyst, a preparation method thereof and a method for preparing isobutene through isobutane dehydrogenation. The preparation method of the isobutane dehydrogenation catalyst comprises the following steps: (a) subjecting a template agent, a nonionic surfactant, an acid agent and industrial sodium silicateto be mixed and in contact under a solution condition to obtain a solution A; (b) crystallizing the solution A, and then sequentially conducting washing and drying to obtain mesoporous material raw powder; (c) carrying out template agent removal treatment on the mesoporous material raw powder to obtain a spherical mesoporous molecular sieve material carrier; and (d) carrying out thermal activationtreatment on the spherical mesoporous molecular sieve material carrier obtained in the step (c), then carrying out dipping treatment in a solution containing a Pt component precursor and a Zn component precursor, and then sequentially carrying out solvent removal treatment, drying and roasting. According to the method, the isobutane dehydrogenation catalyst with high catalytic activity can be synthesized by using a low-cost silicon source.

The invention relates to the field of catalysts, and discloses a method for preparing an isobutane dehydrogenation catalyst, the isobutane dehydrogenation catalyst prepared by the method, and a methodfor preparing isobutene through dehydrogenation of isobutane. The method for preparing the isobutane dehydrogenation catalyst comprises: (a) preparing a first mesoporous material filter cake with a three-dimensional cubic pore channel structure and a second mesoporous material filter cake with a two-dimensional hexagonal pore channel structure; (b) preparing a silica gel filter cake; (c) mixing the first mesoporous material filter cake, the second mesoporous material filter cake, the silica gel filter cake and chlorite, and sequentially carrying out ball milling, pulping, drying and templateagent removal to obtain a spherical double-mesoporous chlorite composite material carrier; and (d) carrying out dipping treatment on the obtained spherical double-mesoporous chlorite composite material carrier in a solution containing a Pt component precursor and a Zn component precursor, and then sequentially carrying out solvent removal treatment, drying and roasting. The obtained isobutane dehydrogenation catalyst of the invention has good dehydrogenation activity and carbon deposition resistance.

The invention discloses a low-carbon alkane dehydrogenation process method. According to the low-carbon alkane dehydrogenation process method, a circulating fluidized bed process is adopted, and a chromium-based microsphere catalyst is loaded; and the catalyst preparation method comprises: dissolving a high-valent chromium precursor in a reducing agent solution, and impregnating into an alumina microsphere carrier so as to prepare the catalyst. According to the present invention, the low-carbon alkane raw material enters the circulating fluidized bed reactor filled with the Cr2O3 microsphere catalyst and is subjected to the dehydrogenation reaction, and the reaction regeneration circulation system is formed through circulation coupling, such that the continuous performing of the catalytic dehydrogenation reaction and the effective supply of the heat can be ensured; and the low-carbon alkane dehydrogenation circulating fluidized bed process has advantages of simple process, continuous production, and low equipment investment.

The invention relates to the field of catalysts, and discloses an isobutane dehydrogenation catalyst with a supporter being a composite material containing silica gel and hexagonal mesoporous materialas well as a preparation method and application of the isobutane dehydrogenation catalyst. The method comprises the following steps: (a) preparing hexagonal mesoporous material raw powder; (b) preparing a hexagonal mesoporous material; (c) carrying out activation treatment on the hexagonal mesoporous material; and (d) carrying out activation treatment on the supporter, then carrying out impregnation treatment in a solution containing a Pt component precursor and a Zn component precursor, and then sequentially carrying out solvent removal treatment, drying treatment and roasting treatment. According to the method, the isobutane dehydrogenation catalyst with high catalytic activity can be synthesized by using a low-cost silicon source.