Efficient Hydrogenation Catalysts for Purification of Terephthalic Acid
H2Max™ Series
Edition Date :
February 06, 2026
H2Max™ catalysts are optimized for the purification of terephthalic acid (PTA) to remove impurities, such as 4-carboxybenzaldehyde (4-CBA). The process involves hydrogenation of colored by-products to water-soluble, colorless compounds in a fixed bed reactor. Thanks to the advanced design of our palladium-based catalysts, they ensure highly efficient purification of terephthalic acid, with 4-CBA content typically reduced to less than 20 ppm. The H2Max series is also a more economical solution, as it demonstrates significantly lower loss of costly palladium during operation compared to state-of-the-art catalysts.
We offer a choice of PTA purification catalysts to suit different plant requirements:
• H2Max™ 50: Classical grade PTA catalyst with reliable palladium retention
• H2Max™ HD: Higher grade with enhanced palladium retention due to patented dispersion and distribution of the precious metal on the support structure
Product Information
Benefits
- Precious-metal-based catalysts on granular carbon support with highly dispersed Pd, assuring activity remain stable for a long time
- Efficient: The purified terephthalic acid (PTA) has typically less than 20 parts-per-million (ppm) of 4-carboxybenzaldehyde (4-CBA)
- Cost-effective: Low loss of expensive palladium from the catalyst during operation
| Product composition | Palladium on carbon carrier |
| Size | 4-8 mm mesh ( = 2.36 - 4.75 mm ) |
| Shape | Granules |
