Wyniki wyszukiwania - Biblioteka Nauki

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Zrównoważony rozwój metod otrzymywania biodiesla

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Pobłocki K. , Pawlak M. , Drzeżdżon J. , Jacewicz D. E.

Wiadomości Chemiczne

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2023

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tom [Z] 77, 11-12

1073--1095

EN

The increase in urbanization and the growing demand for petroleum products, fuels and energy correlates with the depletion of resources of non-renewable energy sources such as crude oil, hard coal, and natural gas. Due to the high emissions of greenhouse gases, i.e., carbon oxides(COx), nitrogen oxides (NOx) and sulfur oxides (SOx), the use of fossil fuels causes drastic climate changes [1]. Therefore, new, "green",sustainable, and renewable energy sources, e.g., biofuels, are currently being sought. Such interests of scientists are in line with people's most urgent needs due to the rapidly depleting oil resources, the increase in fuel prices and the degradation of the natural environment. Biodiesel is one of the most widely used biofuels due to its more positive impact on the environment (compared to diesel fuel), and technical and strategic advantages. Therefore, in this review, we would like to draw attention to the sustainable development of biodiesel synthesis methods, the progression of advanced technologies supporting this process, and the various types of reactors for biodiesel production (for example, a membrane or microwave reactor) will also be discussed [1].

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Prekatalizatory oligomeryzacji olefin oparte na kationach chromu(III) oraz kobaltu(II) : właściwości fizykochemiczne oraz katalityczne

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Malinowski J. , Drzeżdżon J. , Sikorski A. , Jacewicz D. E.

Wiadomości Chemiczne

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2022

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tom [Z] 76, 11-12

943--962

EN

The introduction describes the most important facts about the development of polyolefins. This is followed by a description of the role of polyolefins and the most important applications in industry and everyday life. The paper presents new, highly active precatalysts for oligomerization of olefins. These are coordination compounds based on chromium(III) cation, anions of various polycarboxylic acids and auxiliary ligands, such as 1,10-phenanthroline or 2,2'-bipyridyl. This review presents their crystallographic structures and basic parameters describing the elementary cell. The catalytic properties of the obtained oligomerization products using chromium(III) coordination compounds by MALDI-TOF MS are described. In conclusion, the presented precatalysts are compared with others described in the literature.

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Katalizatory wykorzystywane w syntezie biodiesla

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Pobłocki K. , Walczak J. , Drzeżdżon J. , Jacewicz D. E.

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tom [Z] 76, 3-4

129--144

EN

Rising prices of electricity, conventional fuels and heating require decisive steps in the further development of technologies based on renewable energy sources. These include geothermal- ; hydrothermal- ; aerothermal- ; and solar energy. Due to the fact that the petrochemical industry is one of the fastest growing branches of the economy, we would like to expand on the topic related to biofuels. Biodiesel is an alternative fuel similar to conventional diesel. It is usually made from animal fat, vegetable oil and waste cooking oil. Its biodegradability, nontoxicity and lack of sulfur and aroma content make it superior to conventional gasoline and diesel. During fuel consumption, it emits fewer air pollutants and greenhouse gases other than nitrogen oxides. In this literature review, we will discuss the latest trends in the world related to catalysts used in biodiesel synthesis.

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Właściwości katalityczne i biomedyczne związków zawierających jony rutenu (II) oraz Rutenu (III)

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Pobłocki K. , Pawlak M. , Walczak J. , Drzeżdżon J. , Jacewicz D. E.

Wiadomości Chemiczne

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2023

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tom [Z] 77, 5-6

569--595

EN

Ruthenium complexes appear in scientific publications mainly as catalysts in the olefins metathesis process. In this review, we want to indicate the research niche regarding the use of ruthenium(II) and ruthenium(III) complexes in other catalytic processes, i.e. polymerization or epoxidation of olefins and depolymerization. We would like to combine the catalytic properties of ruthenium(II,III) complex compounds with their biomedical activity due to the growing problem of drug resistance (including antibiotic resistance). Scientists have been designing new metallopharmaceuticals exhibiting biological activity for several years, therefore this requires a critical review of the literature. The main goal of designing new metallodrugs is to create compounds with new or stronger biological properties compared to free ligands. Ruthenium compounds are considered potential substitutes for known drugs. In particular, Ru(II) and Ru(III) based complexes have reduced toxicity and can be tolerated in vivo. In addition, a wide spectrum of ruthenium oxidation states, a different mechanism of action and the kinetics of ligand substitution increase the advantage over coordination complex compounds based on platinum. In conclusion, in this review, we will focus on the latest reports from the literature on the catalytic properties and biomedical activity of ruthenium(II) and ruthenium(III) chemical compounds.