Protective Solutions for Catalyst Grading

Opportunity feed sources have extended the range of poisons that hydroprocessing unit operators must face. Shell Catalysts & Technologies has committed unique R&D resources to solve the contaminant problems refineries face every day in order to protect catalyst investment and, ultimately, refineries’ bottom lines.

Shell Catalysts & Technologies offers SENTRY™ Guard Catalysts and Support — an entire portfolio of solutions that prevent, diagnose, and resolve contaminant issues commonly seen among hydroprocessing units. By implementing SENTRY™ technology, unit operators can thwart contamination effects on catalysts and therefore process higher quality feeds.


SENTRY™ Guard Catalysts and Support products are dedicated to protecting hydroprocessing operations from potentially harmful feedstock contaminants. These products use Shell Catalysts & Technologies filtering infrastructure to prevent contaminants from poisoning catalysts and sabotaging catalyst ROI.

  • SENTRY™ OptiTrap Series - Medallion, MacroRing , Ring, Filterlobe
    • Deep bed filter systems that use inert and catalytically active shaped, high-void aluminas to maximise fouling tolerance
  • SENTRY™ InterLayer
    • Durable NiMo- and CoMo-promoted catalysts designed for sise grading between small diameter catalysts and larger reactor support media
  • SentrySupport[Active]
    • Spherical NiMo-promoted active support designed to provide the foundation for hydroprocessing reactor catalyst loads
  • SentrySupport[Inert]
    • Inert ceramic support designed to withstand the most severe hydrotreating environments


Some hydroprocessing units currently have systems in place that allow for contaminants to poison catalysts. These SENTRY™ Guard Catalysts and Support products maximise trapping technology to eliminate entrainment of unwanted elements in feedstocks, improving the quality of the feeds.

  • SENTRY™ MaxTrap[As]
    • Trilobe catalyst on a high surface area alumina extrudate specially formulated to trap Arsenic (As) present in petroleum feedstocks
    • Demonstrates exceptional stability in severe hydrotreating environments
  • SENTRY™ MaxTrap[Ni,V]
    • Extrudate specially formulated to trap nickel (Ni) and vanadium (V) in vacuum gas oils where asphaltene entrainment is present
  • SENTRY™ MaxTrap[Ni,V]VGO
    • Optimised alumina extrudate specially formulated to trap nickel (Ni) and vanadium (V) in deep cut vacuum gas oils or deasphalted oils
  • SENTRY™ MaxTrap[Si]
    • High surface area alumina extrudate specially formulated to trap silicon (Si) in naphtha feeds
  • MaxTrap[CCR]
    • Demet catalyst specially formulated for maximum CCR conversion
    • Recommended for units processing DAO and deep-cut VGOs or suffering from significant residual entrainment
Catalysts poisoning worker monitors machinery at Pearl GTL Plant

Get customised refining solutions, performance predictions, and technical support from our highly experienced team of experts.

As owners/operators, we are uniquely positioned to provide catalyst innovations with our combined technological know-how and first-hand operational experience in the oil, gas, and petrochemical industries. Regardless of unit design, operating conditions, feed properties or product targets, we work with our customers to ensure the best possible solutions that address specific catalyst needs.

Distillate Hydrotreating

Distillate hydrotreating can help refiners achieve complex demands set out by clean fuels legislation through effective hydrodesulphurisation (HDS).

Naphtha Catalysts

We determine the best reactor loading strategies based on naphtha composition and design of individual process unit to achieve results.