A supported core-shell bimetallic catalyst with high selectivity, and preparation method and an application thereof are provided. SBA-15 is used as support, platinum (Pt) is used as active component, 3d transition metal is used as cocatalysts. In the core-shell bimetallic catalyst formed by the 3d transition metal and Pt, in one aspect, by the addition of the 3d metal in the core, the d-band center of surface Pt atoms is down shifted, and the absorption of propylene is weakened, thereby improving the selectivity for propylene. In another aspect, the use of Pt is reduced by the addition of the 3d transition metal, improving the utilization of Pt. The catalyst is applicable in a hydrogen atmosphere, has a good effect on the preparation of propylene by propane dehydrogenation and causes high dehydrogenation activity under high temperature conditions. The total selectivity for propylene may reach 85%, which achieves high propylene selectivity.

A supported core-shell bimetallic catalyst with high selectivity, and preparation method and an application thereof are provided. SBA-15 is used as support, platinum (Pt) is used as active component, 3d transition metal is used as cocatalysts. In the core-shell bimetallic catalyst formed by the 3d transition metal and Pt, in one aspect, by the addition of the 3d metal in the core, the d-band center of surface Pt atoms is down shifted, and the absorption of propylene is weakened, thereby improving the selectivity for propylene. In another aspect, the use of Pt is reduced by the addition of the 3d transition metal, improving the utilization of Pt. The catalyst is applicable in a hydrogen atmosphere, has a good effect on the preparation of propylene by propane dehydrogenation and causes high dehydrogenation activity under high temperature conditions. The total selectivity for propylene may reach 85%, which achieves high propylene selectivity.

A process for dehydrogenating alkane or alkylaromatic compounds comprising contacting the given compound and a dehydrogenation catalyst in a fluidized bed. The dehydrogenation catalyst is prepared from an at least partially deactivated platinum/gallium catalyst on an alumina-based support that is reconstituted by impregnating it with a platinum salt solution, then calcining it at a temperature from 400° C. to 1000° C., under conditions such that it has a platinum content ranging from 1 to 500 ppm, based on weight of catalyst; a gallium content ranging from 0.2 to 2.0 wt %; and a platinum to gallium ratio ranging from 1:20,000 to 1:4. It also has a Pt retention that is equal to or greater than that of a fresh catalyst being used in a same or similar catalytic process.

A process for dehydrogenating alkane or alkylaromatic compounds comprising contacting the given compound and a dehydrogenation catalyst in a fluidized bed. The dehydrogenation catalyst is prepared from an at least partially deactivated platinum/gallium catalyst on an alumina-based support that is reconstituted by impregnating it with a platinum salt solution, then calcining it at a temperature from 400° C. to 1000° C., under conditions such that it has a platinum content ranging from 1 to 500 ppm, based on weight of catalyst; a gallium content ranging from 0.2 to 2.0 wt %; and a platinum to gallium ratio ranging from 1:20,000 to 1:4. It also has a Pt retention that is equal to or greater than that of a fresh catalyst being used in a same or similar catalytic process.

A catalyst for dehydrogenation of hydrocarbons includes a support including zirconium oxide and alumina. A concentration of the zirconium oxide in the catalyst is in a range of from 1 weight percent (wt. %) to 20 wt. %. The catalyst includes from 0.01 wt. % to 2 wt. % of an alkali metal or alkaline earth metal. The catalyst includes from 1 wt. % to 2 wt. % of tin. The catalyst includes from 0.1 wt. % to 2 wt. % of a platinum group metal. The alkali metal or alkaline earth metal, tin, and platinum group metal are disposed on the support.

A catalyst for dehydrogenation of hydrocarbons includes a support including zirconium oxide and alumina. A concentration of the zirconium oxide in the catalyst is in a range of from 1 weight percent (wt. %) to 20 wt. %. The catalyst includes from 0.01 wt. % to 2 wt. % of an alkali metal or alkaline earth metal. The catalyst includes from 1 wt. % to 2 wt. % of tin. The catalyst includes from 0.1 wt. % to 2 wt. % of a platinum group metal. The alkali metal or alkaline earth metal, tin, and platinum group metal are disposed on the support.

Systems and methods for processing a C.sub.3 and C.sub.4 hydrocarbon mixture have been disclosed. The C.sub.3 and C.sub.4 hydrocarbon mixture is first processed in an isomerization unit to isomerize n-butane to form isobutane. The resulting effluent stream from the isomerization unit comprising primarily isobutane and C.sub.3 hydrocarbons, collectively, is flowed into a separation unit configured to separate the effluent stream to form a C.sub.3 stream comprising C.sub.1 to C.sub.3 hydrocarbons and a C.sub.4 stream comprising primarily isobutane. The isobutane in the C.sub.4 stream is further dehydrogenated to form isobutene, which is further flowed into an MTBE synthesis unit as a feedstock for producing MTBE.

Systems and methods for processing a C.sub.3 and C.sub.4 hydrocarbon mixture have been disclosed. The C.sub.3 and C.sub.4 hydrocarbon mixture is first processed in an isomerization unit to isomerize n-butane to form isobutane. The resulting effluent stream from the isomerization unit comprising primarily isobutane and C.sub.3 hydrocarbons, collectively, is flowed into a separation unit configured to separate the effluent stream to form a C.sub.3 stream comprising C.sub.1 to C.sub.3 hydrocarbons and a C.sub.4 stream comprising primarily isobutane. The isobutane in the C.sub.4 stream is further dehydrogenated to form isobutene, which is further flowed into an MTBE synthesis unit as a feedstock for producing MTBE.

The present invention concerns a process (100) for the production of a butylene product (9) in which a component mixture (2) containing butane, butylene and hydrogen is provided using a butane hydrogenation (10) to which a reaction feed (1) containing butane and hydrogen is subjected, the component mixture (2) or part thereof being subjected as a first separation feed to a first membrane separation (40), by means of which a first permeate (3) enriched in hydrogen with respect to the first separation feed and a first retentate (4) depleted in hydrogen with respect to the first separation feed and containing hydrogen, butane and butylene are formed, the first retentate (4) or part thereof being subjected to a second membrane separation (50) as a second separation feed, in which a second permeate (6) containing at least the predominant part of the hydrogen of the second separation feed and a second retentate containing at least the predominant part of the butane and the butylene of the second separation feed are formed, wherein the first membrane separation (40) is carried out using a sweep gas (5) containing butane and the first permeate (3) is obtained as permeate (3) charged with butane of the sweep gas (5) and/or the second membrane separation (50) is carried out using the sweep gas (5) containing butane and the second permeate (6) is obtained as permeate (6) charged with butane of the sweep gas (5), and wherein the first permeate (3) charged with butane of the sweep gas (5) and/or the second permeate (3) charged with butane of the sweep gas or one or more parts thereof is used in the formation of the reaction feed (1). A corresponding plant is also the subject of this invention.

The present invention concerns a process (100) for the production of a butylene product (9) in which a component mixture (2) containing butane, butylene and hydrogen is provided using a butane hydrogenation (10) to which a reaction feed (1) containing butane and hydrogen is subjected, the component mixture (2) or part thereof being subjected as a first separation feed to a first membrane separation (40), by means of which a first permeate (3) enriched in hydrogen with respect to the first separation feed and a first retentate (4) depleted in hydrogen with respect to the first separation feed and containing hydrogen, butane and butylene are formed, the first retentate (4) or part thereof being subjected to a second membrane separation (50) as a second separation feed, in which a second permeate (6) containing at least the predominant part of the hydrogen of the second separation feed and a second retentate containing at least the predominant part of the butane and the butylene of the second separation feed are formed, wherein the first membrane separation (40) is carried out using a sweep gas (5) containing butane and the first permeate (3) is obtained as permeate (3) charged with butane of the sweep gas (5) and/or the second membrane separation (50) is carried out using the sweep gas (5) containing butane and the second permeate (6) is obtained as permeate (6) charged with butane of the sweep gas (5), and wherein the first permeate (3) charged with butane of the sweep gas (5) and/or the second permeate (3) charged with butane of the sweep gas or one or more parts thereof is used in the formation of the reaction feed (1). A corresponding plant is also the subject of this invention.