Abstract
Lubricant oils take significant part in current health and environmental considerations since they are an integral and indispensable component of modern technology. Antioxidants are probably the most important additives used in oils because oxidative deterioration plays a major role in oil degradation. Zeolite nanoparticles (NPs) have been proven as another option as green antioxidants in oil formulation. The anti-oxidative behavior of zeolite NPs is obvious; however, the phenomenon is still under investigation. Herein, a study of the effect of extra-framework cations stabilized on Linde Type L (LTL) zeolite NPs (ca. 20 nm) on inhibition of oxidation in palm oil-based lubricant oil is reported. Hydrophilic LTL zeolites with a Si/Al ratio of 3.2 containing four different inorganic cations (Li+, Na+, K+, Ca2+) were applied. The oxidation of the lubricant oil was followed by visual observation, colorimetry, fourier transform infrared (FTIR) spectroscopy, 1H NMR spectroscopy, total acid number (TAN), and rheology analyses. The effect of extra-framework cations to slow down the rate of oil oxidation and to control the viscosity of oil is demonstrated. The degradation rate of the lubricant oil samples is decreased considerably as the polarizability of cation is increased with the presence of zeolite NPs. More importantly, the microporous zeolite NPs have a great influence in halting the steps that lead to the polymerization of the oils and thus increasing the lifetime of oils.
Highlights
Lubricant oil is one of the most beneficial components in modern technology that can be used to prevent friction in various industries and machinery [1]
The results showed that Linde Type L (LTL) zeolite effectively controls the content of acidic oxidation products in oil, and the oxidation process is significantly decelerated
Where p, q, r, and s are the number of atoms of the basic elements of LTL zeolite, and S denotes the electronegativity of the atom
Summary
Lubricant oil is one of the most beneficial components in modern technology that can be used to prevent friction in various industries and machinery [1]. Polymerization and Several methods such as chemical modification (hydrogenation, inter-esterification, epoxidation), blending, and organic antioxidant additivation have been developed to improve the oxidation stability of lubricant oils [4,5,6,7,8]. Some of these approaches are still not applied by the industries since excess modification will alter the useful properties of base oil and, concurrently, increases the production cost of lubricants. Some of the chemicals used for modification are harmful and can severely pollute the environment
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call