38results about How to "Reduce the risk of carbon accumulation" patented technology

The invention relates to the field of catalysts, and discloses a non-noble metal propane dehydrogenation catalyst, a preparation method and applications thereof. The method comprises the following steps: (a) in the presence of a template agent, carrying out mixing contacting on a silicon source and an acid agent, and sequentially crystallizing, filtering and drying the mixture obtained after mixing contacting to obtain mesoporous material raw powder; (b) carrying out template agent removal treatment on the mesoporous material raw powder to obtain a rod-like mesoporous molecular sieve carrier;and (c) carrying out dipping treatment on the rod-like mesoporous molecular sieve carrier in a solution containing an active non-noble metal component precursor, and then sequentially carrying out solvent removal treatment, drying and roasting. The obtained non-noble metal propane dehydrogenation catalyst has good dehydrogenation activity, good selectivity and good stability.

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 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.

The invention relates to the field of catalysts, and discloses an isobutane dehydrogenation catalyst with a composite material containing a doughnut-shaped mesoporous material and silica gel as a carrier, a preparation method of the isobutane dehydrogenation catalyst, the isobutane dehydrogenation catalyst prepared by the method, and application of the isobutane dehydrogenation catalyst in preparation of isobutene through isobutane dehydrogenation. The method for preparing the isobutane dehydrogenation catalyst comprises the following steps of (a) preparing doughnut-shaped mesoporous materialraw powder; (b) performing plate-stripping agent treatment on the doughnut-shaped mesoporous material raw powder to obtain the doughnut-shaped mesoporous material; (c) mixing the doughnut-shaped mesoporous material with the silica gel to obtain the composite material containing the doughnut-shaped mesoporous material and the silica gel; and (d) performing dipping treatment in a solution containinga PT component precursor and a Zn component precursor after thermally activating the composite material, and then sequentially performing solvent removal treatment, drying and roasting. The obtainedisobutane dehydrogenation catalyst has better dehydrogenation activity and carbon deposition resistance.

The invention relates to the field of dehydrogenation catalysts, in particular to a dehydrogenation catalyst and a preparation method thereof and an application thereof. The dehydrogenation catalyst comprises a carrier and a main active metal component loaded on the carrier, wherein the main active metal component is a noble metal, and the carrier is a magnesium-aluminum composite carrier. The preparation method of the dehydrogenation catalyst comprises the following steps: (1) under the alkaline condition, an aluminum salt solution contacts with a precipitating agent, and an aluminum hydroxide hydrogel is obtained after aging and separation; the aluminum hydroxide hydrogel is cleaned by respectively using water and an alcohol solvent; and the aluminum hydroxide alcogel contacts with an alcohol solution of a magnesium salt under the ultrasonic condition, then the solvent is removed, and drying and roasting are performed to obtain the magnesium-aluminum composite carrier; and (2) the main active metal component is loaded on the magnesium-aluminum composite carrier. The dehydrogenation catalyst can achieve relatively good dehydrogenation activity, selectivity, stability and carbon deposition resistance under the condition of a very low noble metal loading capacity.

The invention relates to the field of catalysts, and discloses an isobutane dehydrogenation catalyst with a rodlike mesoporous molecular sieve silica gel composite material as a supporter, a preparation method of the isobutane dehydrogenation catalyst, the isobutane dehydrogenation catalyst prepared by the method, and an application of the isobutane dehydrogenation catalyst in isobutene preparation by isobutane dehydrogenation. The method for preparing the isobutane dehydrogenation catalyst comprises the following steps: (a) preparing mesoporous material raw powder; (b) carrying out template agent removal treatment on the mesoporous material raw powder to obtain a rod-like mesoporous molecular sieve; (c) preparing a rodlike mesoporous molecular sieve silica gel composite material supporter; and (d) carrying out dipping treatment on the rod-like mesoporous molecular sieve silica gel composite material supporter 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. The obtained isobutane dehydrogenation catalyst has good dehydrogenation activity and carbondeposition resistance.

The invention provides a direct methane dry reforming power generation method based on a symmetric double-cathode structure solid oxide fuel cell. The cell takes an anode layer as a supporting electrode layer, and an electrolyte layer and a cathode layer are stacked up and down along the thickness direction to form a symmetric structure; the cell is heated by a heating unit, so that the temperature of the cell is more than 650 DEG C in the operation process of the cell, a mixed gas of carbon dioxide and methane is introduced into a pore channel of the anode layer, and air is introduced into the cathode layer, so that methane dry reforming can be directly carried out in the cell, and direct and efficient utilization of methane in the solid oxide fuel cell is realized; and the method has the advantages of simple and easily-controlled operation conditions, low cost, safety, high efficiency and good reaction selectivity.

A method for producing natural gas from low hydrogen carbon bicarbonate tail gas, comprising: the semicoke tail gas is divided into three shares after being purified and desulfurized, the first unit is mixed with circulating gas or circulating liquid, and enters a first-stage transformation-methanation integrated reactor; After the two streams are mixed with the outlet gas of the first-stage transformation-methanation integrated reactor, they enter the second-stage methanation reactor; after the third stream is mixed with the outlet gas of the second-stage methanation reactor, they enter the third-stage methanation reactor; The outlet gas of the first-stage methanation reactor enters the fourth-stage methanation reactor to generate methane-enriched gas; the methane-enriched gas is decarbonized or/and liquefied to obtain natural gas or liquefied natural gas. Through the method of the present invention, at a low hydrogen-to-carbon ratio other than the conventional process, the semi-coke tail gas is used to generate natural gas, which effectively improves the utilization efficiency of effective gas; and the present invention adopts the post-decarbonization process, which can reduce the circulation amount and reduce the risk of carbon deposition ; The present invention has the advantages of simple process, simple operation, low investment and high utilization rate of resources.

The invention relates to the field of catalysts, and discloses a non-noble metal isobutane dehydrogenation catalyst, a preparation method and application thereof. The method for preparing the non-noble metal isobutane dehydrogenation catalyst comprises the following steps: (a) providing eggshell-shaped mesoporous material raw powder; (b) carrying out template agent removing treatment on the eggshell-shaped mesoporous material raw powder to obtain an eggshell-shaped mesoporous material carrier; (c) under an ultrasonic condition, loading a first active non-noble metal component and a second active non-noble metal component on the eggshell-shaped mesoporous material carrier to obtain an initial non-noble metal isobutane dehydrogenation catalyst; and (d) vulcanizing the initial non-noble metalisobutane dehydrogenation catalyst by using a sulfur-containing gas. The obtained non-noble metal isobutane dehydrogenation catalyst has good dehydrogenation activity, good selectivity and good stability.

The invention relates to the field of catalysts and discloses an isobutane dehydrogenation catalyst employing silica gel as a support, a preparation method for the isobutane dehydrogenation catalyst,the isobutane dehydrogenation catalyst prepared by the method and an application of the isobutane dehydrogenation catalyst in isobutane dehydrogenated isobutene preparation. The preparation method forthe isobutane dehydrogenation catalyst comprises the steps: (a) subjecting the silica gel to thermal activating treatment, so as to obtain a thermal activated silica gel support; and (b) subjecting the thermal activated silica gel support obtained in the step (a) to dipping treatment in a solution containing a Pt ingredient precursor and a Zn ingredient precursor, and then, carrying out solvent removing treatment, drying and roasting sequentially, wherein the silica gel has a specific surface area of 200m<2>/g to 300m<2>/g, a pore volume of 1mL/g to 2mL/g, an average pore size of 10nm to 30nmand a mean particle size of 20 to 100 microns. According to the method, the operation is simple and convenient, the raw materials are readily available, and the obtained isobutane dehydrogenation catalyst can achieve relatively good dehydrogenation activity, selectivity, stability and resistance to carbon deposition under the condition that the load amount of noble metal is very small.

The invention especially discloses a fuel cell power generation system with partial oxidization, reforming, conversion and directly coupling of chemical chains in view of poor adaptability of solid oxide fuel cells to carbon-bearing fuel. The system follows the scheme of a high-temperature solid oxide fuel cell with reforming, conversion and direct internal coupling of chemical chains, directly arranges the cathode and the anode of the high-temperature solid oxide fuel cell in exhaust spaces at the tail parts of an oxidization reactor and a reduction reactor for reforming and conversion of thechemical chains respectively to form a cathode chamber and an anode chamber which are tightly connected, a hydrogen-rich gas generated by the reforming and conversion of methane chemical chains and oxygen in reaction air are directly supplied to the anode and the cathode of the high-temperature solid oxide fuel cell. The system enables the heat and mass transfer and utilization in the two processes to be efficiently connected, reasonably utilizes low-grade heat energy in the process, reduces the process exergy loss of chemical energy-heat energy exchange, and realizes the cascade utilizationof energy; and meanwhile, the thermodynamic limit in the reaction process is broken through. Finally, the high-efficiency power generation of methane is realized, and carbon dioxide is enriched.

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 mesoporous material filter cake with a one-dimensional hexagonal structure; (b) preparing a silica gel filter cake; (c) mixing the mesoporous material filter cake, the silica gel filter cake and zeolite, carrying out ball milling, pulping the solid powder obtained after ball milling with water, carrying out spray drying, and removing the template agent in the obtained product to obtain a spherical double-mesoporous zeolite composite materialcarrier; and (d) carrying out dipping treatment on the spherical double-mesoporous zeolite composite material carrier obtained in the step (c) 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.