Galexia suite of hydroprocessing ctalysts and services

Galexia™ platform of hydroprocessing catalysts and services  

The transformative Galexia platform of specialty hydroprocessing solutions from ExxonMobil and Albemarle combines state-of-the-art catalysts and unsurpassed service expertise to optimize your operation and identify high-value opportunities for step-out growth and profitability.

  • Leverages companies’ extensive hydroprocessing knowledge to tap into full potential of high-performing Nebula®, Celestia™ and MIDW™ specialty catalysts
  • Industry-leading activity enables new opportunities and operational flexibility.
  • Delivers tailored, drop-in solutions for catalyst refills to help refiners optimize performance and efficiency
  • Ensures customer demands are better addressed throughout the value chain
  • Builds on long-term, expert relationship that led to the development and commercialization of several key industry catalysts used around the world


Galexia includes breakthrough Celestia™ HDT catalyst, as well as Nebula™ and MIDW™ catalysts. Application of these technologies in distillate hydrotreaters, as well as in light cycle oil (LCO) and vacuum gas oil (VGO) hydrocracker pretreaters, have yielded exceptional returns.

  • ExxonMobil chemical celestia waves

    Celestia™ catalyst

    Delivering extraordinary results at ExxonMobil refineries around the world since 2015, Celestia bulk metal catalyst technology provides step-change benefits in hydrotreating activity and processing capability.

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  • Engineers reviewing schematics.

    Nebula™ catalyst

    Generating exceptional customer loyalty, Nebula catalyst technology provides ultra-high hydrogenation power, increasing hydrodesulfurization (HDS), hydrodenitrogenation (HDN) and aromatic saturation activity.

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  • MIDW catalyst

    MIDW™ catalyst

    Backed by forty years of ExxonMobil innovation in diesel dewaxing, MIDW catalyst technology provides high yields of low cloud point diesel, converting waxy paraffins to higher performance molecules.

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Galexia services

The combined, complementary expertise of ExxonMobil and Albemarle is unsurpassed in the industry, as is our shared commitment to implementing best practices and to achieving results that help refiners succeed. Services include:

  • Refinery optimization

    Galexia goes beyond traditional product offerings to help refiners optimize performance/efficiency by analyzing plant operations and identifying value across the refinery. With Galexia, refiners will be able to:
    • Meet refinery targets by maximizing the value of state-of-the-art catalysts
    • Deliver superior performance in existing units by optimizing reactor configurations and catalyst loads derived from extensive experience in profitable refinery operations

  • Pointing to schematics.

    Collaborative, expert Galexia services

    Uniquely leveraging the technical experience, refinery operating know-how and successful track record of both companies, with the Galexia platform, refiners will receive value-added services in addition to a comprehensive integrated suite of products

Success story

Celestia catalyst was loaded into a high-pressure hydrocracker processing vacuum gasoil, light cycle oil and heavy coker gasoil. 


  • Increase cycle length to align turnarounds
  • Increase HDC yields at equal cold-flow properties

Optimized loadings

  • ~40% Celestia and Nebula in pretreat reactor with NiMo hydrotreating catalysts
  • ~15% MIDW in the hydrocracking downstream reactor
galexia results chart

Featured resources

View highlighted news, events, technical papers and case studies below. To see our full collection of resources, browse our Library.
  • ExxonMobil Chemical Library icon

    ExxonMobil, Together with Albemarle, Creates The Galexia™ Platform, A Transformative Suite of Hydroprocessing Catalysts and Services

    The platform enables an improved way of doing business, ensuring customer demands are better addressed at every stage throughout the value chain.

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  • ExxonMobil Chemical play button icon

    Specialty hydroprocessing Celestia™ catalyst

    Learn how Celestia ultra-high activity, bulk metal hydroprocessing catalyst can help increase your operation’s performance and flexibility.

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  • ExxonMobil Chemical play button icon

    A Particle of Difference

    How ExxonMobil Catalysts and Technology Licensing solves shared challenges through expertise, specialty catalysts, technology licensing and collaboration.

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  • ExxonMobil Chemical Library icon

    ExxonMobil Catalysts and Technology Licensing – summary of technologies offered

    Learn about the cutting-edge, proprietary catalysts and advantaged process technologies that ExxonMobil provides for refining, gas and chemical needs.

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