Synergistic Effects Between Phosphonium‐Alkylphosphate Ionic Liquids and Zinc Dialkyldithiophosphate (ZDDP) as Lubricant Additives

Qu, Jun; Barnhill, William C.; Luo, Huimin; Meyer, Harry M.; Leonard, Donovan N.; Landauer, Alexander K.; Kheireddin, Bassem; Gao, Hong; Papke, B. L.; Dai, Sheng

doi:10.1002/adma.201502037

Cited by 181 publications

(149 citation statements)

References 35 publications

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“…An emerging alternative to ZDDP is oil-miscible ionic liquids (ILs). Recent efforts by Qu et al have developed a group of fully oil-miscible phosphonium-phosphate ILs as next-generation anti-wear additives [12][13][14][15][16]. In addition to excellent oil-miscibility, these ILs also demonstrate a number of other features, such as high thermal stability, non-corrosiveness, excellent wettability on metal The aforementioned information clearly reflects that pronounced progress has been made towards developing highly efficient ILs for engine applications.…”

Section: Introductionmentioning

confidence: 99%

Impact of Lubricant Additives on thePhysicochemical Properties and Activity of Three‐Way Catalysts

et al. 2016

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Abstract:As alternative lubricant anti-wear additives are sought to reduce friction and improve overall fuel economy, it is important that these additives are also compatible with current emissions control catalysts. In the present work, an oil-miscible phosphorous-containing ionic liquid (IL), trihexyltetradecylphosphonium bis(2-ethylhexyl) phosphate ([P 66614 ][DEHP]), is evaluated for its impact on three-way catalysts (TWC) and benchmarked against the industry standard zinc-dialkyl-dithio-phosphate (ZDDP). The TWCs are aged in different scenarios: neat gasoline (no-additive, or NA), gasoline+ZDDP, and gasoline+IL. The aged samples, along with the as-received TWC, are characterized through various analytical techniques including catalyst reactivity evaluation in a bench-flow reactor. The temperatures of 50% conversion (T50) for the ZDDP-aged TWCs increased by 30, 24, and 25˝C for NO, CO, and C 3 H 6 , respectively, compared to the no-additive case. Although the IL-aged TWC also increased in T50 for CO and C 3 H 6 , it was notably less than ZDDP, 7 and 9˝C, respectively. Additionally, the IL-aged samples had higher water-gas-shift reactivity and oxygen storage capacity than the ZDDP-aged TWC. Characterization of the aged samples indicated the predominant presence of CePO 4 in the ZDDP-aged TWC aged by ZDDP, while its formation was retarded in the case of IL where higher levels of AlPO 4 is observed. Thus, results in this work indicate that the phosphonium-phosphate IL potentially has less adverse impact on TWC than ZDDP.

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Section: Introductionmentioning

confidence: 99%

Impact of Lubricant Additives on thePhysicochemical Properties and Activity of Three‐Way Catalysts

et al. 2016

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“…The above results indicate that N 88816 S P and P 888S S P can remarkably enhance the EP and lubricating behavior of ZDDP. Moreover, it has been established that this phenomenon can be attributed to the synergistic effects between ILs and ZDDP [39]. Therefore, it is feasible for the two ILs to partly or completely replace ZDDP for practical use, and this is highly likely to decrease the toxicity caused by zinc to the catalyst system.…”

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confidence: 99%

Oil-soluble ionic liquids as antiwear and extreme pressure additives in poly-α-olefin for steel/steel contacts

Huang

et al. 2017

Friction

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Abstract:To enhance the lubricating and extreme pressure (EP) performance of base oils, two types of oil-soluble ionic liquids (ILs) with similar anion albeit dissimilar cations were synthesized. The physical properties of the prepared ILs were measured. The anticorrosion properties of ILs were assessed by conducting corrosion tests on steel discs and copper strips, which revealed the remarkable anticorrosion properties of the ILs in comparison with those of the commercial additive zinc dialkyldithiophosphate (ZDDP). The tribological properties of the two ILs as additives for poly-α-olefin-10 (PAO10) with various mass concentrations were investigated. The tribological test results indicate that these ILs as additives are capable of reducing friction and wear of sliding contacts remarkably as well as enhance the EP performance of blank PAO10. Under similar test conditions, these IL additives exhibit higher lubricating and anti-wear (AW) performances than those of ZDDP based additive package in PAO10. Subsequently, X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS) were conducted to study the lubricating mechanism of the two ILs. The results indicate that the formation of tribochemical film plays the most crucial role in enhancing the lubricating and AW behavior of the mixture lubricants.

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“…Compared to commercial lubricating oils of similar viscosities, this IL shows significantly improved friction coefficient and thermal stability. Studies from our group and others have shown that [P6, 6,6,14] + cation based ILs are potential additives for hydrocarbon base oils for a variety of surfaces [19][20][21][22][23][24][25][26][27]. As little as 2 mol% IL dissolved in a base oil lubricates as effectively as the pure IL, and low concentration IL-oil mixtures are much more effective lubricants than the pure base oil [20][21][22], or oils with traditional additives [22,28].…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquids as Grease Base Liquids

Mozes

Cooper

2017

Lubricants

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Abstract:The rheological characteristics of one mineral oil and two ionic liquid (IL) based lubricating greases were explored as a function of thickener concentration. The ILs used are 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][TFSI]) and trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide ([P 6,6,6,14 ][TFSI]), with polytetrafluoroethylene (PTFE) particles used as thickeners. Greases with different base liquid concentrations (60-80 wt %) were investigated using small-amplitude oscillatory shear and viscous flow measurements, and contact angle measurements probed adhesion at base liquid-PTFE interfaces. Rheological properties are influenced by base liquid-PTFE adhesion and the chemical structure of the grease base liquids. With the addition of thickener, the greases generally have higher elasticity, strain resistance, and frequency independent properties. Viscometric rheological tests illustrate non-Newtonian shear-thinning behaviour for all greases. [BMIM][TFSI] based greases show the most elastic properties and strain resistance, as well as the highest initial and lowest final viscosities of the greases tested.

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Synergistic Effects Between Phosphonium‐Alkylphosphate Ionic Liquids and Zinc Dialkyldithiophosphate (ZDDP) as Lubricant Additives

Cited by 181 publications

References 35 publications

Impact of Lubricant Additives on thePhysicochemical Properties and Activity of Three‐Way Catalysts

Impact of Lubricant Additives on thePhysicochemical Properties and Activity of Three‐Way Catalysts

Oil-soluble ionic liquids as antiwear and extreme pressure additives in poly-α-olefin for steel/steel contacts

Ionic Liquids as Grease Base Liquids

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