Zeolite Nanocrystals Protect the Performance of Organic Additives and Adsorb Acid Compounds during Lubricants Oxidation

Moussa Zaarour , Hussein El Siblani , Nicolas Arnault , Philippe Boullay , Svetlana Mintova (1)

1 LCS - Laboratoire catalyse et spectrochimie

Zeolite nanocrystals were used as proactive agents to extend the lifetime of commercial lubricants by protecting the performance additives from depletion and adsorbing the acid formed during oxidation. The nanosized zeolites were introduced into four lubricants and subjected to oxidation (90 °C and 150 °C). A strong affinity towards protection of zinc dialkyldithiophosphate (ZDDP) additive was demonstrated by 31 P NMR and FTIR spectroscopy even after heating at 150 °C for 24h. FTIR profiles of lubricants aged in the presence of LTL showed lower oxidation degree while the formed oxidation products (aldehydes, ketones, and acids) were adsorbed on the zeolite crystals acting as scavengers.

Keywords: Zeolite; lubricants; additive protection; anti-oxidant; FTIR; NMR

Domains: Chemical Sciences

Moussa Zaarour, Hussein El Siblani, Nicolas Arnault, Philippe Boullay, Svetlana Mintova. Zeolite Nanocrystals Protect the Performance of Organic Additives and Adsorb Acid Compounds during Lubricants Oxidation. Materials, 2019, 12 (17), pp.2830. ⟨10.3390/ma12172830⟩. ⟨hal-03027955⟩