Well-defined surface tungstenocarbyne complex through the reaction of [W(≡CtBu)(CH2tBu)3] with CeO2: a highly stable precatalyst for NOx reduction with NH3.

A novel well-defined precatalyst for ammonia-selective catalytic reduction of NOx (NH₃-SCR), namely, [W(≡CtBu)(CH₂tBu)₃]/CeO₂, was prepared by surface organometallic chemistry and then characterized. Due to the high dispersion of the active phase, this catalyst showed excellent activity after calcination at 500 °C, described by up to 99% conversion of NOx, high N₂ selectivity, broad operation temperature window (225–500 °C), and extremely high durability for the selective catalytic reduction of NOx with NH₃. [ABSTRACT FROM AUTHOR]