Paliva (Fuels) is a scientific journal issued quarterly by the Faculty of Environmental Technology, ICT Prague. Fuels publishes papers on a broad range of topics covering exploitation, processing, upgrading, and utilization of various types of fuels, and power engineering.
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Dear readers,

welcome to the website of the journal Paliva (Fuels). The journal is published quarterly in online format, which allows a broad and rapid access for readers. The journal is open not only to researchers but also for technicians and other professionals working in plants, refineries, power stations, gasworks and companies processing, handling or trading both fossil and alternative fuels. The aim of the journal is to share information between professional research organizations and users of research results.
Since 2010 the journal Paliva (Fuels) is included in the list of recognized peer-reviewed journals, issued by the Research, Development and Innovation Council of the government of the Czech Republic. Amongst other requirements that must be met to be a member of the group of journals, all papers published in the journal undergo a review process by two independent reviewers.
We sincerely hope you become regular readers of the journal and perhaps contributors in its future issues. Thank you.

Karel Ciahotný
editor in chief

Paliva (Fuels) included in Scopus database

In 2019, when Paliva celebrated its 10th anniversary, the journal was succesfully evaluated and included in Scopus. Paliva is the only periodical in its research field published in the Czech Republic indexed by Scopus database. Since then, we expect further increase of the quality of published papers and greater proportion of papers written in English. It is also an oncoming opportunity for new authors from both industry and academic sphere.

  2-year 3-year 4-year
2022 Impact Factor 0.317 0.213 0.213
2021 Impact Factor 0.31 0.31 0.31
2020 Impact Factor 0.05 0.05 0.05

Scopus Impact Factor and other scientometric data

Paliva (Fuels) Journal included in CAS databases

We are proud to annouce that Paliva (Fuels) Journal was successfully evaluated by Chemical Abstracts Service (CAS) and included to the CAS databases among more than 10 thousand scientific journals worldwide. Starting with the 2015 issues, CAS collects bibliographic information and abstracts of articles issued by Fuels, which makes the access to the findings published in the journal substantially easier for scientists and field specialists from over the world.


Current issue:

General Methods for the Analysis of Chemical Properties of Fuels

Martin Staš, Hugo Kittel, Lukáš Matějovský, Eliška Lyko Vachková, Pavel Šimáček
This article is the third in a series of articles focused on presenting common methods for evaluating conventional and alternative fuels. The first two articles of the series were devoted to the determination of elements and non-hydrocarbon compounds in fuels [1]) and the determination of the physical properties of fuels [2]). This text presents an overview of the chemical properties determined for individual fuels. The chemical properties, acidity and alkalinity of fuels, content of unsaturated compounds, aniline point, water content, oxidation stability, and corrosive properties of fuels are presented in this article. The main goal of the article is to provide a comprehensive overview of which fuels are monitored, why they are monitored, and what methods are used for this monitoring. The emphasis is mainly on standardized parameters and tests, but in some cases, non-standardized tests are also discussed, or (additional) determinations not required by standards.
For conventional and alternative fuels, several physical chemical, or other properties are used to evaluate the quality of these fuels. In this article, we present an overview of the chemical properties that are monitored for liquid and gaseous conventional and alternative fuels. These are acidity and alkalinity, content of unsaturated compounds, aniline point, water content, oxidation stability, and corrosive effects of fuels. In the article, we present the testing methods that are used to monitor these properties. Furthermore, we also present the reasons why these properties are monitored for individual fuels. Emphasis is placed on standardized parameters and tests, i.e., those prescribed by the relevant standards for individual fuels. However, parameters and alternative methods are also discussed, which are not prescribed by any standard for the respective fuels, but are supplementary determinations. The determination of elements and hydrocarbon and non-hydrocarbon compounds in fuels potentially falls within the scope of this article. However, since two separate articles [1] were devoted to these parameters, they will not be discussed here
Keywords: liquid fuels, gaseous fuels, conventional fuels, alternative fuels, chemical properties, acidity, basicity, aniline point, water content, oxidation stability, corrosive properties
2/2024 - pages 38 - 45DOI: 10.35933/paliva.2024.02.01

Investigation of gas exchange parameters of small two stroke engine correlated with hydrogen fuel supplement

Ahmed Eldeeb, Moussa Said, Mostafa Abdel Khalik, Adham M. Abdelkader

Due to the lack of complete dedicated suction and exhaust strokes and obviate the need of valvetrain assembly in two stroke engines, the bottom surface of the piston and the crankcase is used as a scavenging pump leads to that about one fifth of the fresh charge is short-circuited to the exhaust results in very high hydrocarbon emissions and poor fuel consumption. It is suggested that a combination of gasoline and hydrogen could be a superior solution combining the advantages of both engine itself and hydrogen doping. An accurate amount of hydrogen that has high flame propagation speed blended with gasoline could provide faster combustion of fuel mixture over the few crank angle degrees in the short gas exchange process reducing short-circuited charge with little modifications to the engine system. In this paper hydrogen-gasoline blend as an alternative fuel in a 63.3 cc, air cooled single cylinder, crankcase scavenged two stroke engine is tested. The unseen decommissioning of small two stroke engine in near future, the attractiveness of studying alternative fuel specially hydrogen and absence of investigation of the effect of hydrogen fuel supplement on gas exchange parameters molded this paper.

Keywords: two-stroke engine; hydrogen, engine performance
2/2024 - pages 46 - 52DOI: 10.35933/paliva.2024.02.02

Torrefaction and pyrolysis of agrowaste-derived materials: Properties and quality of products

Jaroslav Moško, Siarhei Skoblia, Zdeněk Beňo, Josef Farták, Petr Baroš, Petr Jevič, Pavla Měkotová, Michael Pohořelý

Huge amounts of agricultural residues or wastes represent an interesting lignocellulosic material which can be used for energy recovery by pyrolysis as an alternative to incineration. Together with the energy production, biochar (solid residue), can be with an advantage used as a soil conditioner or for other applications such as adsorbents, supporting the principles of circular economy. Here we studied the effect of torrefaction and pyrolysis temperature from 250 to 700 °C on the composition and properties of pyrolysis gas and biochar from four types of agrowaste-derived materials: sunflower harvest residues, grain harvest residues, separate from digestion, and extracted sunflower meal. The paper provides dataset on detailed composition of pyrolysis gases, indicating the differences due to different composition of the feedstock materials and describes the main parameters affecting the use of biochar as soil amendment. Torrefaction proved to be unsuitable for the production of soil amendment quality biochar and the temperature higher than 400 °C is recommended in order to produce good quality biochar while transforming most of the energy content of feedstock to primary pyrolysis products.

Keywords: harvest residues; agricultural waste; pyrolysis; biochar; pyrolysis gas
2/2024 - pages 53 - 65DOI: 10.35933/paliva.2024.02.03

A method for predicting tank bottom sludge formation during crude oil storage

Petr Straka, Daniel Maxa

The laboratory method for predicting the amount and composition of sludge accumulated during crude oil storage on the bottom of a high capacity storage tank has been developed and tested. The laboratory model of the storage tank on a scale of 1:20 was designed with the assumption of a 20-fold acceleration of the process of sedimentation of wax particles and, thus, the formation of a bottom sludge. The results of the model and industrial scale (in the high capacity tank) storage of a Russian export blend crude oil were compared and excellent agreement was found. The developed method was used to evaluate an Iran Light crude oil and a blend of crude oils, Azeri Light, and CPC. The diametrically different behaviour of the compared crude oils during their model storage was ascribed to the different paraffinic particles size distributions and rheologic properties. The correlation between the composition of the crude oil and its tendency to form a sludge at the bottom of the storage tank was not found.

Keywords: crude oil, storage, tank, sludge, wax, particle
2/2024 - pages 66 - 73DOI: 10.35933/paliva.2024.02.04

technical support editor-in-chief