BASF Catalysts offers exceptional expertise in the development of technologies that protect the air we breathe, produce the fuels that power our world and ensure efficient production of a wide variety of chemicals, plastics and other products including advanced battery materials. BASF’s Catalysts division is the world’s leading supplier of environmental and process catalysts. The group offers exceptional expertise in the development of technologies that protect the air we breathe, produce the fuels that power our world and ensure efficient production of a wide variety of chemicals, plastics and other products, including advanced battery materials. We believe mobility’s future lies in more than just products. So where others come to a full stop, we’re just getting started—by leveraging the full power of BASF to continually advance our comprehensive package of sustainable solutions that enable us to travel further, as well as above and beyond. A leading supplier of high performance cathode active materials (CAM) for electrified vehicles to battery producers and automotive OEMs around the world. Protecting the air we breathe from harmful emissions through innovation. BASF leverages unsurpassed expertise in the development of emission control technologies for a wide range of market applications. BASF is committed to advancing and promoting environmentally-sound technologies to achieve a sustainable future in aviation. Offering 50 years of experience developing intelligent solutions for air quality over a wide range of applications — enabling clean air for a healthier, more sustainable future. As the global leader in chemical catalysts, BASF develops cutting-edge catalyst chemistry with our customers’ needs in mind. We want to contribute to a world that provides a viable future with enhanced quality of life for everyone. We do so by creating chemistry for our customers and society and by making the best use of available resources. BASF offers the widest portfolio of adsorbent technologies for a broad spectrum of applications in industries such as refining, petrochemical, chemical, and gas processing. At BASF, our Fluid Catalytic Cracking (FCC) catalyst and additive offerings together with our expert technical services build the right solution to create value within any unit’s constraints. Paving the way toward a brighter, more secure future. Manufacturing products for sustainable solutions, reducing emissions from our processes, and using non-fossil fueled energy sources – all of these efforts help lead BASF on a continuing journey of sustainability. BASF Natural Gas experts have a diverse portfolio of products to custom design a solution and help you meet your Natural Gas treatment needs. BASF has been serving the natural gas treatment market for over 60 years. With more than 150 years of experience in metal sourcing, trading, and hedging, we’ve built tangible results for our industrial customers. With more than 100 years of experience in recycling materials, BASF’s end-to-end recycling program is known and trusted around the globe. As a leader in precious-metal thermocouples for many years, BASF recently applied its technological expertise to optical-based temperature measurement. With nearly 50 years of experience, we offer reliability and efficient solutions for the treatment of various gases. BASF Sorbead® Air adsorbents are alumino silicate gels in the form of hard, spherical beads. They are essential in removing water from compressed air so that the efficiency of chemical processes is not compromised. Sorbead® Air is the most energy saving and environmentally friendly adsorbent available for the air compression industry. Innovative, step-change technology with dual-purpose performance: removal of heavy hydrocarbons and water to cryogenic specifications in a single unit. Developing and producing pharmaceutical ingredients for more than 75 years, enabling us to provide the solutions you need to meet today's and tomorrow's challenges for your pharmaceutical business. Find the latest news and media information for BASF’s Catalysts division, headquartered in Iselin, New Jersey, USA, the world’s leading supplier of environmental and process catalysts. Explore this collection of resources to learn more about our innovative research and Catalyst solutions.
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BASF provides phthalic anhydride (PA) catalysts for the production of phthalic anhydride from the oxidation of o-Xylene and naphthalene or mixed feed. Our products and services are continually reviewed through regular BASF PA Catalyst Customer Forum meetings to ensure they align with our customers’ needs. We innovate to help customers succeed.

For PA producers, BASF's o-Xylene catalysts offer safe operation at a maximum capacity of up to 100 g/Nm3 feed. Our naphthalene and mixed feed catalysts offer superior PA yield. In both cases, superior PA quality is guaranteed by expert technical service and a long-term commitment to innovation, which we demonstrate in our reference list – the longest in the world – and our in-house operations.


BASF has produced phthalic anhydride for over 140 years and researched PA catalysts for more than 120 years. Since 1837, our site in Ludwigshafen, Germany has produced more than 4 million tons of PA. We have worked with post reactors since 1980, and we have more than 80 years of experience in the loading and start-up supervision of phthalic anhydride catalysts. With those decades of accumulated knowledge and insight, we stand behind our products.

When it comes to BASF’s offerings, delivering products to the customer site is just the beginning. Our technical service representatives in Asia, Europe and America ensure products always perform and deliver exceptional value to users. They do that with extensive professional expertise in phthalic anhydride catalysts, including hands-on operational experience in supervision, start-up assistance, and catalyst performance optimization.

Our expertise includes:

  • O-Xylene and naphthalene/mixed feed oxidation in fixed bed process
  • O-Xylene loadings up to 100 g/Nm3
  • Supply of complete catalyst filling and measurement equipment on loan basis, including 5-tube, 10-tube and 20-tube catalyst filling machines
  • Optimization of catalyst operation condition using portable COx analyzers
  • Verification of air flow measurements by total combustion


Whether you work with o-Xylene feed or naphthalene/mixed feed phthalic anhydride catalysts, BASF products provide a wide range of benefits such as higher yield, improved selective and active layers, better stability, and overall exceptional quality and performance.

BASF o-x feed PA catalyst

O4-68 Catalyst Advantage

  • Higher proportion of selective layers per tube
  • Hot Spot (HS) remains longer in selective layers
  • Higher Phthalic Anhydride yield in 2nd operation year
  • Top performance for low loading
BASF Catalysts | O4-66 Catalyst

O4-66 Catalyst Advantage

  • Improved 4-layer catalyst generation
  • Improved stability of 1st catalyst layer
  • Designed for harsh operation conditions
  • Higher Phthalic Anhydride yield in 2nd and 3rd operation year
BASF Catalysts | O4-88 Catalyst

O4-88 Catalyst Advantage

  • Higher yield vs. O4-66
  • 3 selective layers
  • Patented new active mass
  • Easy start-up behavior
BASF Catalysts | O4-888 Catalyst

O4-888 Catalyst Advantage

  • 5 layer catalyst system
  • Improved selective layers and active layers
  • Excellent product quality

BASF naphthalene/mixed feed PA catalyst

BASF Catalysts | O4-29HFI Catalyst

O4-29HFI Catalyst Advantage

  • Improved 4 layer catalyst generation
  • Higher yield vs. O4-29HF
  • Up to 65% o-Xylene in feed
BASF Catalysts | Close-up of Manufacturing Site
BASF Catalysts | O4-35 Catalysts

O4-35 Catalyst Advantage

  • Latest generation 5-layer catalyst system
  • Catalyst geometry adjusted for maximum performance
  • Superior PA quality

Product Portfolio

Browse our PA catalysts to learn more about the benefits of a particular product.

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