SSZ-13 for SCR

Cu-SSZ-13 is the global benchmark catalyst for selective catalytic reduction (SCR) of NOx in diesel exhaust. It combines >90% NOx conversion at 200 °C with the hydrothermal stability to survive repeated exposure to 800 °C+ during diesel particulate filter (DPF) regeneration — a requirement that eliminated earlier Cu-exchanged zeolites.

Why Cu-SSZ-13 for Diesel SCR

Cu-SSZ-13’s CHA framework solves the fundamental problem that defeated earlier Cu-zeolite SCR catalysts: copper migration during high-temperature exposure. In Cu-ZSM-5 and Cu-Beta, copper ions migrate and agglomerate into inactive CuO particles when the catalyst sees DPF regeneration temperatures above 650 °C. In Cu-SSZ-13, the CHA chabazite cage confines Cu²⁺ ions at specific six-membered ring positions where they are sterically protected against migration. This structural stabilisation is the basis for Cu-SSZ-13’s signature property: retention of >80% NOx conversion after standardised 800 °C/16-hour hydrothermal aging.

Grade Selection for SCR

Key Performance Data (Cu-SSZ-13)

• NOx conversion at 200 °C: >90% fresh, >80% after 800 °C/16h aging
• Operating window: 150-550 °C at >80% conversion
• N₂ selectivity: >95% (minimises N₂O greenhouse gas)
• Hydrothermal stability: retains CHA crystallinity to 850 °C (dry), 750 °C (10% steam)

For Fe-SSZ-13 (high-temperature, sulfur-tolerant SCR) and precursor forms, see the SSZ-13 product hub.

When requesting a sample, specify your application (on-road, non-road, marine, or stationary), target emission standard, exhaust temperature range, and whether you need pre-exchanged Cu-SSZ-13 or H/NH₄-form precursor.