An activated carbon/palladium-gallium (Pd—Ga) liquid alloy composite catalyst, including a support and an active component supported on the support. The support is acid washed activated carbon. The active component is Pd—Ga liquid alloy. In the present invention, the active component Pd—Ga, present in the form of liquid alloy, forms a self-protective oxide layer. This protects acetylene from secondary reactions on the surface of the catalyst, inhibits or reduces acetylene to deeply hydrogenate to form ethane, thereby increasing ethylene selectivity. The present invention further provides a preparation method of the catalyst, where the catalyst of the present invention is prepared by immersion. The preparation method is simple and easy to operate. When the activated carbon/Pd—Ga liquid alloy composite catalyst provided by the present invention is used for acetylene hydrogenation to prepare ethylene, conversion rate of acetylene is as high as 99.8%, while the ethylene selectivity is as high as 98.9%.

An activated carbon/palladium-gallium (Pd—Ga) liquid alloy composite catalyst, including a support and an active component supported on the support. The support is acid washed activated carbon. The active component is Pd—Ga liquid alloy. In the present invention, the active component Pd—Ga, present in the form of liquid alloy, forms a self-protective oxide layer. This protects acetylene from secondary reactions on the surface of the catalyst, inhibits or reduces acetylene to deeply hydrogenate to form ethane, thereby increasing ethylene selectivity. The present invention further provides a preparation method of the catalyst, where the catalyst of the present invention is prepared by immersion. The preparation method is simple and easy to operate. When the activated carbon/Pd—Ga liquid alloy composite catalyst provided by the present invention is used for acetylene hydrogenation to prepare ethylene, conversion rate of acetylene is as high as 99.8%, while the ethylene selectivity is as high as 98.9%.

A method for operating an integrated system for producing olefins may include contacting a hydrogenation feed with a first hydrogenation catalyst to produce a hydrogenated effluent, the hydrogenation feed including at least a portion of a first process effluent from a first olefin production process and at least a portion of a second process effluent from a second olefin production process. The hydrogenation feed may include at least hydrogen, ethylene, carbon monoxide, acetylene, methyl acetylene, and propadiene, and the first hydrogenation catalyst may be a hydrogenation catalyst having a temperature operating range of at least 40° C. The hydrogenated effluent may include methyl acetylene, propadiene, or both. The method may further include contacting at least a portion of the hydrogenated effluent with a second hydrogenation catalyst, which may cause hydrogenation of at least a portion of the methyl acetylene and propadiene to produce an MAPD hydrogenated effluent.

A method for operating an integrated system for producing olefins may include contacting a hydrogenation feed with a first hydrogenation catalyst to produce a hydrogenated effluent, the hydrogenation feed including at least a portion of a first process effluent from a first olefin production process and at least a portion of a second process effluent from a second olefin production process. The hydrogenation feed may include at least hydrogen, ethylene, carbon monoxide, acetylene, methyl acetylene, and propadiene, and the first hydrogenation catalyst may be a hydrogenation catalyst having a temperature operating range of at least 40° C. The hydrogenated effluent may include methyl acetylene, propadiene, or both. The method may further include contacting at least a portion of the hydrogenated effluent with a second hydrogenation catalyst, which may cause hydrogenation of at least a portion of the methyl acetylene and propadiene to produce an MAPD hydrogenated effluent.

A process for regenerating spent catalyst by combusting coke and fuel gas together in the presence of enriched oxygen restores activity to the catalyst to bring back to adequate activity level while reducing or obviating the need for the oxygen treatment step. The oxygen concentration in the oxygen supply gas should be greater than 21 vol %.

A process for regenerating spent catalyst by combusting coke and fuel gas together in the presence of enriched oxygen restores activity to the catalyst to bring back to adequate activity level while reducing or obviating the need for the oxygen treatment step. The oxygen concentration in the oxygen supply gas should be greater than 21 vol %.

Tandem catalysts for the dehydrogenation of alkanes and/or alcohols in tandem with selective hydrogen combustion are provided. Also provided are methods of making the catalysts and methods of using the catalysis for the dehydrogenation of alkanes and/or alcohols. The catalysts include a support having a surface, dehydrogenation catalysts particles dispersed on the surface of the support, and a porous selective hydrogen combustion catalyst overcoat on the dehydration catalyst particles. The catalysts couple dehydrogenation with selective hydrogen combustion in a sequence of reactions occurring in tandem to shift the equilibrium of the dehydrogenation towards higher conversion.

Processes for upgrading a hydrocarbon. The process can include contacting a hydrocarbon-containing feed with fluidized catalyst particles that can include a Group 8-10 element or a compound thereof disposed on a support to effect one or more of dehydrogenation, dehydroaromatization, and dehydrocyclization of at least a portion of the hydrocarbon-containing feed to produce a coked catalyst and an effluent. The process can also include contacting at least a portion of the coked catalyst particles with an oxidant to effect combustion of at least a portion of the coke to produce regenerated catalyst particles. The process can also include contacting an additional quantity of the hydrocarbon-containing feed with at least a portion of the regenerated catalyst particles to produce additional effluent and re-coked catalyst particles.

The present disclosure relates to gallium-based dehydrogenation catalysts that further include additional metal components, and to methods for dehydrogenating hydrocarbons using such catalysts. One aspect of the disclosure provides a calcined dehydrogenation catalyst that includes a gallium species, a cerium species, a platinum promoter, and a silica-alumina support. Optionally, the composition can include a promoter selected from the alkali metals and alkaline earth metals.

Method to prepare a catalyst for use in a process for the synthesis of methanol, comprising indium oxide in the form of In.sub.2O.sub.3, and at least one additional metal selected from a noble metal; and in that the average particle size of said noble metal phase is, preferably at least 0.05 nm, and less than 5 nm as determined by STEM-EDX, characterized in that the catalyst is prepared by co-precipitation of a saline solution at a pH above 8.5 comprising an indium salt and a salt of the at least one additional metal selected from a noble metal and optionally further comprising a salt of the at least one alkaline earth metal.