Synergism of stable nitroxyl radicals and amines during the oxidation process of motor fuels and oils at increased temperatures

Vasylkevych, Oleksandr; Кофанов, Олексій; Кофанова, Олена; Tkachuk, Kostiantyn

doi:10.15587/1729-4061.2017.118784

Cited by 4 publications

(4 citation statements)

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“…One more important issue is the perspective of the greening of vehicles that move on the roads nearby UC. This case should necessarily include the modification of traditional fuels and the introduction of a variety of alternative types of fuels and energy (Vasylkevych, 2016;Vasylkevych, 2017;Butler, 2020;Kumar, 2020). According to Hem (1970), it is possible to estimate quite accurately the salinity (mineralization) of the 5 investigated systems with the help of measurements of the electrical conductivity of solutions (in particular, water 6 soil extracts, water samples, etc.).…”

Section: Fig 3 Synergistic Combination Of the Principles Of Environme...mentioning

confidence: 99%

Strategic Planning and Ecological Safety Evaluation of University Campuses on Green Marketing Principles

Kofanov,

Kofanova,

Tverda

et al. 2024

EREM

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Strategic planning of university campuses (UC) aims to harmonize nature, humans, and architectural complexes, enhancing the positive university image through specialized green and recreation zones. Highly urbanized UC areas, particularly with nearby roads, encounter increased technogenic load and pose additional health hazards. The purpose of the paper is the evaluation of the environmental safety level of the UC recreational territories on the example of campuses of Kyiv universities, located nearby highly loaded roads, using a complex of express methods of analysis, mathematical modeling and criterion-based approach, considering the main green economy principles. The scientific novelty of the paper and the authors’ contribution is in the assessment of the environmental safety level of city-type UC recreational territories being under the significant technogenic load from vehicle emissions. Such express analysis methods as densimetry, viscometry, stalagmometry, conductometry, potentiometry and optical methods, and in particular, refractometric studies have been used to assess the impact of vehicle emissions. The mathematical modeling and computational experiment have been carried out for dispersion fields of the main vehicle emissions pollutants. Ecologically acceptable distances from the road considering the specifics of recreational territory have been determined using the integral index of technogenic load. Propositions for minimizing human health hazards and improving the system of environmental monitoring of such territories have been provided and substantiated. The study also confirms the positive effects of environmental management and green marketing principles synergy, benefiting both nature and humans as well as the university image. Obtained results can be used for the design and reconstruction of UC and their recreational areas, as well as for planning roads located nearby the campuses, improving traffic on them. It is also convenient to foresee the enhancement of the environmental activities in the student research work and create student communities for monitoring the UC environmental state and the development of eco-startup projects.

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Section: Fig 3 Synergistic Combination Of the Principles Of Environme...mentioning

confidence: 99%

Strategic Planning and Ecological Safety Evaluation of University Campuses on Green Marketing Principles

Kofanov,

Kofanova,

Tverda

et al. 2024

EREM

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“…At the same time, the volumes of emissions of toxicants with vehicle exhaust gases highly depend on the quality and type of motor fuel used, technical conditions and vehicle brand or model, traffic conditions, traffic flow intensity, type and conditions of the roadway covering, meteorological and weather conditions, other factors, etc. The problem of emissions can be partially solved by improving the quality of the fuel with special additives or transitioning to fuels of biological origin (Vasylkevych et al, 2016;Vasylkevych et al, 2017;Matani and Mali, 2021). However, even the use of the most modern and effective additives cannot reduce the engine exhaust toxicity to a safe level.…”

Section: Statement Of the Problem And Analysis Of Literary Sourcesmentioning

confidence: 99%

Modeling of the Car Traffic Air Pollution on the Territories Neighboring Multi-level Interchanges

Кофанов

Кофанова

Chepel

et al. 2022

EREM

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Ensuring the proper quality of the environment is a foreground and important task for achieving sustainable development goals in contemporary urban societies. Therefore, the aim of the research is to study the air pollution on the territories neighboring multi-level interchanges and assess the additional load on the lower levels based on the analysis of physico-chemical properties of harmful substances, which are exhausts components. The scientific novelty of the paper and the authors’ contribution is in determining the level of ecological danger of territories neighboring multi-level interchanges as a result of the summation effect from emissions of vehicle flows, physical and chemical properties of pollutants, and processes of their sedimentation. To predict the pollution level of the roadside air, the model of torch approximation based on the K-theory and the equations of turbulent diffusion was used. Both mathematical modeling and visualization were performed by the Mathcad software package. Particular attention was paid to the analysis of the environmental situation neighboring multi-level interchanges and urban objects in terms of their pollution with nitrogen oxides and particulate matter PM10. Research has shown that due to the sedimentation processes a significant increase of the technogenic load on the interchange first level road will be observed. It was found that, compared to the upper road, the technogenic load in the center of the lower road increases on average by 1.4–1.6 times in terms of nitrogen oxides and by 1.5–1.6 times in terms of PM10. The territory with the harmful substances maximum permissible concentration excess is significantly increased. So, taking into account that multi-level interchanges are much more environmentally acceptable than surface sections of roads with traffic lights and pedestrian crossings, they still pose danger to the health of people who stay for a long time at the transport stops, move on the sidewalks and underground crossings, as well as for vehicle drivers and passengers. Thus, it is recommended not to place on the territories neighboring multi-level interchanges public transport stops, cafes, shops, and other city infrastructure objects, as well as to remove the existing ones.

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“…The additive was proportioned in such a way that its mixture with DF would correspond to the current Standard requirements and favour the improvement of ecological and economic characteristics of the engine with no deterioration of its operational characteristics. Specific attention has been paid to environmental safety of the ingredients, their compatibility, concentration balance, and to the potential synergistic effects [43].…”

Section: Figure 3 Concentration Fields Of Nitrogen Oxides (In Terms Of No2) Within the Highway Section: (а) In Terms Of The North Wind; (mentioning

confidence: 99%

“…Antioxidant complex inhibits free-radical processes within the fuel identifying antioxidant action [43], [44]. Consequently, the additive acts on the conditions of the surface of fuel-air phase separation, reducing surface tension of the system and reducing pressure of the saturated steam of the liquid phase.…”

Section: Figure 3 Concentration Fields Of Nitrogen Oxides (In Terms Of No2) Within the Highway Section: (а) In Terms Of The North Wind; (mentioning

confidence: 99%

Mitigation of the environmental risks resulting from diesel vehicle operation at the mining industry enterprises

Кофанов¹,

Vasylkevych²,

Кофанова³

et al. 2020

Min. miner. depos.

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Purpose is to predict potentially hazardous effects of diesel vehicles of mining enterprises on the environment and to minimize the environmental risks caused by these impacts by modifying motor fuels with special additives. Methods. Method of mathematical modeling, implemented within the MathCAD environment, was used for assessment of the increase of environmental load on the roadside territories and human health caused by emissions of pollutants from exhaust gases of heavy diesel vehicles (HDV) of mining enterprises. The data, concerning potential emissions of the most hazardous pollutants from the exhaust gases of HDVs, has been generalized both by own field observations and by the analysis of scientific literary sources. The load on the environment by the analyzed pollutants has been corrected taking into consideration the share of heavy diesel vehicles engaged in cargo carriages by means of pendular routes of mining enterprises. Findings. Increased level of the environmental risk, resulted from operation of heavy diesel vehicles and other types of special-purpose diesel machines, has been identified. It has been proposed to apply a method of physical and chemical control of the motor fuel by adding multifunctional fuel composition (i.e. additive) containing both surface-active and antioxidant complexes. It has been determined that the use of the developed additive decreases substantially the load on the environment, in particular, on the roadwayby 26-29% for nitrogen oxides and by 39-41% for particulate matter (PM). The abovementioned mitigates environmental risks as well as the impact of heavy diesel vehicles on the human health. The substantial reduction of the distances, within which safe concentration levels of the analyzed pollutants can be observed, has been achieved. Originality. It has been identified that the diesel fuel modification by the developed additive makes it possible to solve a problem of local and diffuse pollution of a roadside space resulted from HDV emissions. It has been proved that the use of the fuel composition decreases toxic level of exhaust gases of diesel motors and reduces fuel consumption while improving the fuel burning conditions as well as air-fuel mixture forming. Practical implications. The obtained results may be applied to improve ecological safety level of the roadside territories and to minimize the ecological risks resulted from HDVs of mining enterprises for the environment and human health.

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Synergism of stable nitroxyl radicals and amines during the oxidation process of motor fuels and oils at increased temperatures

Cited by 4 publications

References 0 publications

Strategic Planning and Ecological Safety Evaluation of University Campuses on Green Marketing Principles

Strategic Planning and Ecological Safety Evaluation of University Campuses on Green Marketing Principles

Modeling of the Car Traffic Air Pollution on the Territories Neighboring Multi-level Interchanges

Mitigation of the environmental risks resulting from diesel vehicle operation at the mining industry enterprises

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