Selective Hydrogenation Catalysts

LD 265 is a palladium on alumina catalyst used in various selective and total hydrogenations among them deep olefins saturation for the light cuts, such as C₃, C₄, C₅ or mixture thereof.

LD 465 is a very active palladium on alumina catalyst specially designed for hydrogenation of pyrolysis gasoline cuts. Its very open pore structure maximizes the efficiency of active palladium.

LD 465 is also suitable for total hydrogenation of light cuts, such as C₃, C₄, C₅ or mixture thereof.

LD 153 is a promoted palladium on alumina catalyst used in acetylene removal from ethylene cuts produced by steam cracking.

It is dedicated to front end operation, and provides very good activity and very high selectivity.

Another interest of LD 153 is a much wider operating window compared to previous generation catalysts, minimizing the risk of temperature excursion in case of CO fluctuation in the feed.

LT 279 is a promoted palladium on alumina catalyst used in acetylene removal from ethylene cuts produced by steam-cracking.

It can be used for front end operation where its low tendency to provoke runaway is of prime interest. It can also be used for tail end operation where its superior selectivity allows very high removal of acetylene with no loss of ethylene.

LT 279 is also available for methylacetylene and propadiene selective hydrogenation in the vapour phase process.

LD 273 is a promoted palladium on alumina catalyst used in selective hydrogenation of steam-cracking propylene rich cut.

It provides high selectivity for total elimination of methylacetylene and propadiene with only trace formation of oligomer by-products and no overhydrogenation into propane.

LT 279 is a promoted palladium on alumina catalyst used in methylacetylene and propadiene selective hydrogenation in the vapour phase. It also available for acetylene removal from ethylene cuts produced by steam-cracking.

LD 277 is a promoted palladium on alumina catalyst used for the selective hydrogenation of VAC in raw butadiene cuts.

LD 277 exhibits unique stability in the presence of high vinyl acetylene (VAC) concentration as the formulation of the catalyst prohibits the loss of the active metal palladium.

LD 265 is a palladium on alumina catalyst used in various selective hydrogenations and widely used for selectively hydrogenate the butadiene rich cut into butenes, while minimizing the butane production.

LD 271 is a promoted palladium on alumina catalyst used for selective hydrogenation of residual butadiene contained in raffinate cuts from butadiene extraction unit. LD 271 preserves 1-butene from isomerization into 2-butenes even with butadiene removal down to 1 to 5 wt ppm.

LD 269 is a palladium catalyst specially designed to selectively reduce diolefins (i.e. while preserving olefins) and maximize the isomerization of external to internal olefins (double bond shift).

High isomerization rate is obtained without loss of total olefins through over hydrogenation to alkane. Due to its high activity, selectivity and tolerance to impurities, LD 269 is of special interest for C₄ alkylation pretreatment (Axens Alkyfining® Process) or for olefin polymerisation pretreatment.

LD 267 R is a palladium catalyst specially designed to selectively reduce diolefins (i.e. while preserving olefins) and maximize the isomerization of external to internal olefins (double bond shift).

High isomerization rate is obtained without loss of total olefins through over hydrogenation to alkane. Due to its high activity and high selectivity, LD 267 R is of special interest for C4 alkylation pretreatment (Axens Alkyfining® Process) or for olefin polymerisation pretreatment.

LD 265 is a palladium on alumina catalyst used in various selective and total hydrogenations among them stabilization of pyrolysis gasoline by hydrogenation of styrenics and diolefins.

LD 465 is a very active palladium on alumina catalyst specially designed for hydrogenation of pyrolysis gasoline cuts.

Its very open pore structure maximizes the efficiency of active palladium. This catalyst is of particular choice for feedstock rich in styrene.

Used in first stage hydrogenation reactor, it stabilizes the py-gas. by diolefins selective hydrogenation. This hydrogenated pyrolysis gasoline is suitable for further hydrotreatment on on a typical combination of NiMo and CoMo catalysts, LD 145 and HR 606.

LD 465 X is a very active palladium on alumina catalyst specially designed for hydrogenation of pyrolysis gasoline cuts. LD 465 X is the improved version of the industrially well-known LD 465.

Its very open pore structure crossed with a fine distribution of palladium maximizes the accessibility of active palladium allowing to minimize the palladium inventory while reaching same LD 465 catalyst activity. This catalyst is of particular choice for feedstock rich in styrene.

Used in first stage hydrogenation reactor, it stabilizes the pygas, by diolefins and alkenyl aromatics selective hydrogenation. This hydrogenated pyrolysis gasoline is suitable for further hydrotreatment on a typical combination of NiMo and CoMo catalysts, like LD 145 and HR 606.

LD 485 is a very active palladium on alumina catalyst initially designed for hydrogenation of pyrolysis gasoline cuts. Its very open pore structure maximizes the efficiency of active palladium. This catalyst is of particular choice for reactive feedstocks (rich in styrene) or when high capacity or high severity is required.

Used in first stage hydrogenation reactor, it stabilizes the py-gas by diolefins and alkenyl aromatics selective hydrogenation. This hydrogenated pyrolysis gasoline is suitable for further hydrotreatment on a typical combination of NiMo and CoMo catalysts, like LD 145, HR 406 or HR 606.

LD 585 is an ultra high active palladium on alumina catalyst initially designed for hydrogenation of pyrolysis gasoline cuts containing high amount of CS2. Its very open pore structure under extrudate shape combined with a fine distribution of Palladium maximizes the accessibility of active palladium and thus increase significantly the catalyst activity.

This catalyst is of particular choice for reactive feedstocks (rich in styrene) with high amount of CS2 while high severity is required. Used in first stage hydrogenation reactor, it stabilized the pygas by diolefins and alkenyl aromatics selective hydrogenation. This hydrogenated pyrolysis gasoline is suitable for further hydrotreatment on a typical combination of NiMo and CoMo catalysts, like LD 145 and HR 606.

LD 541 is the latest-developed nickel on alumina catalyst used for the selective hydrogenation of diolefins and alkenyl aromatics present in unsaturated streams. It displays significantly higher activity and provides enhanced product quality and cycle length, while keeping similar properties in terms of stability, resistance to contaminants and regenerability as compared to its predecessors LD 241/ LD 341/ LD 441.

LD 541 is mostly devoted to first stage hydrogenation units processing contaminated feedstocks (with significant amounts of Si, As for instance), when Palladium based catalysts are no more applicable due to contamination, and high level of activity is still required. It allows sweetening the pyrolysis gasoline when required, and prepares a good quality feedstock to the second stage pygas hydrogenation devoted to the preparation for further aromatics production.

LD 551 is the latest generation of high activity Nickel based catalyst marketed by Axens for Pyrolysis Gasoline (socalled Pygas) or Cracked Gasoline 1st stage hydrogenation units, to selectively hydrogenate unsaturated compounds such as diolefins and alkenyl-aromatics. LD 551 offers the advantage of an excellent resistance to Air Burning with a very high activity comparable to LD 541, a very good stability, resistance to contaminants and selectivity in order to avoid any aromatics saturation.

LD 241 is a nickel on alumina catalyst used for the selective hydrogenation of diolefins present in pyrolysis gasolines. It is used in the first step hydrogenation and can be associated with a CoMo catalyst placed in a second step reactor for aromatics production after olefins hydrogenation and hydrodesulfurization. This catalyst has been extensively used worldwide in many units giving constant satisfaction to all customers. It is the catalyst of choice if a sweetening (reduction of mercaptans content) is requested.

LD 341 is a nickel on alumina catalyst used for the selective hydrogenation of diolefins present in pyrolysis gasolines. It is used in the first step hydrogenation and can be associated with a CoMo catalyst placed in a second step reactor for aromatics production after olefins hydrogenation and hydrodesulfurization.

LD 341 RS-300 is the catalyst of choice if a sweetening (reduction of mercaptans content) is requested.

LD 145 is a nickel-molybdenum on special alumina catalyst used in the second step selective hydrogenation of pyrolysis gasoline, including steam-cracking gasoline, for the production of aromatics. The second step consists in the elimination of the sulphur to meet the aromatics specifications, without any loss of aromatics. The second catalyst used in connection with LD 145 is either HR 406 or HR 606.

The use of the LD 145 at the top of the catalytic bed achieves a total selective hydrogenation of the minor proportion of diolefins still present in the gasoline following the first stage selective hydrogenation and a major portion of olefins hydrogenation. This leads to longer cycles at lower operating pressures.

HR 606 is a CoMo type catalyst mainly used in desulfurization of pyrolysis gasoline, or steam cracking gasoline, in Petrochemicals processes where aromatics are the key products. After a 1st stage treatment on a Pd or Ni based catalyst, the Pygas cut is usually processed in a 2nd stage hydrogenation unit which utilizes Axens’ LD 145 for elimination of remaining olefins, followed by HR 606 for desulfurization. The combination of LD 145 and HR 606 delivers highly efficient desulfurization while minimizing aromatics losses. Both catalysts are well proven in this service, retaining exceptional performance over multiple regenerations.

LD 267 R is a palladium catalyst specially designed to selectively reduce diolefins (i.e. while preserving olefins) and maximize the isomerization of external to internal olefins (double bond shift) An other application for this catalyst is the selective hydrogenation of the diolefins and olefins present in high severity reformate in order to eliminate clay treatments or to reduce drastically the clay consumption in the Aromatics Complex.

LD 265 is a palladium on alumina catalyst used in various selective and total hydrogenations among them Phenol production and Styrene Production.

LD 465 is a very active palladium on alumina catalyst specially designed for hydrogenation of pyrolysis gasoline cuts. Its very open pore structure maximizes the efficiency of active palladium.

LD 465 is also suitable for selective hydrogenation of AMS for Phenol production or PhenylAcetylene selective hydrogenation for Styrene production.

LD 485 is a very active palladium on alumina catalyst initially designed for hydrogenation of pyrolysis gasoline cuts. Its very open pore structure maximizes the efficiency of active palladium.

LD 485 is also suitable for selective hydrogenation of AMS for Phenol production or PhenylAcetylene selective hydrogenation for Styrene production.