Article
Energy & Fuels
E. N. Vlasova, A. A. Porsin, P. Aleksandrov, A. L. Nuzhdin, G. A. Bukhtiyarova
Summary: The co-hydroprocessing of SRGO and RSO mixture over the stacked bed sulfide catalytic system showed that temperature and pressure had a significant impact on product quality and n-C18H38 conversion. Increasing temperature from 350°C to 380°C led to a decrease in cloud point due to higher n-C18H38 conversion, while increasing pressure from 4.0 MPa to 7.0 MPa decreased n-C18H38 conversion. The presence of NH3 was found to inhibit hydrocracking/hydroisomerization reactions in the co-processing of RSO-SRGO mixtures.
Article
Chemistry, Applied
E. N. Vlasova, A. A. Porsin, P. Aleksandrov, A. L. Nuzhdin, G. A. Bukhtiyarova
Summary: The co-processing of RSO-SRGO mixture over Mo/Al2O3-CoMo/Al2O3-SAPO-11 and Mo/Al2O3-NiMo/Al2O3-SAPO-11 catalytic systems resulted in decreased cloud point of products as temperature increased, with differences observed in the behavior under varying pressure. The hydrogenated products produced over NiMo/Al2O3-SAP showed lower final boiling point values and aromatic content compared to those produced over CoMo/Al2O3-SAP catalyst. Unexpectedly, pressure had varied effects on cloud point and conversion of long chain alkanes in the hydrodeoxygenation of RSO.
Article
Chemistry, Physical
Josef Blazek, Daria Toullis, Petr Straka, Martin Stas, Pavel Simacek
Summary: This study demonstrates the co-hydrotreating of rapeseed oil and a petroleum feedstock, showing that the catalyst had high hydrogenation activity and the hydrogen consumption increased with pressure. The conversion of rapeseed oil required higher hydrogen consumption compared to the hydrotreating of the petroleum feedstock.
Article
Chemistry, Multidisciplinary
Hector de Paz Carmona, Eliska Svobodova, Zdenek Tisler, Uliana Akhmetzyanova, Katerina Strejcova
Summary: The addition of phosphorus enhances the hydrodesulfurization and hydrodenitrogenation efficiencies of sulfur-free molybdenum carbide catalysts, showing promising activity under industrial conditions and commercial feedstocks. This study paves the way for developing a suitable and sulfur-free alternative to conventional hydrotreating catalysts.
Article
Chemistry, Applied
M. Slezackova, A. Peller, J. Mikulec, M. Banic, J. Blasko, E. Hajekova
Summary: Inedible camelina oil (CSO) can be used as diesel components after hydrotreatment. Under suitable conditions, CSO with high unsaturation can be converted into alkanes, aromatics and higher olefins. The co-hydrotreatment with paraffinic solvents can achieve high triacylglyceride conversion into hydrocarbons.
Article
Energy & Fuels
Fabian S. Mederos-Nieto, Adid O. Santoyo-Lopez, Raul Hernandez-Altamirano, Violeta Y. Mena-Cervantes, Fernando Trejo-Zarraga, Guillermo Centeno-Nolasco, Edgar Ramirez-Jimenez
Summary: This study outlines the production of renewable fuels from castor bean seeds in two stages, first obtaining castor oil methyl esters through reactive extraction and then applying hydrotreating process. Experiments showed that under moderate operating conditions, a higher yield and product selectivity of the kerosene fraction can be achieved.
Article
Energy & Fuels
Tiebin Liu, Peiliang Sun, Huihong Zhu, Tao Yang, Bingtao Tang, Chong Peng
Summary: Two NiMo/Al2O3 catalysts with different acid-base properties were prepared and their effects on FCC diesel hydrotreating and desulfurization performance were investigated. The results showed that the surface structural differences affected the interaction between metals and oxygen atoms, leading to differences in catalytic activity. The catalyst with more active phases exhibited better desulfurization and denitrification performance, while the catalyst with higher sulfidation degree showed better hydrotreating performance. The findings provide insights for improving the performance of catalysts used in refinery processes.
Article
Chemistry, Applied
Yu. V. Vatutina, K. A. Nadeina, O. V. Klimov, M. O. Kazakov, I. G. Danilova, S. V. Cherepanova, D. F. Khabibulin, E. Yu. Gerasimov, I. P. Prosvirin, P. P. Dik, A. S. Noskov
Summary: NiMo/B-Al2O3 catalysts for VGO hydrotreating were prepared using different peptizing agents (nitric acid or ammonium solution). Catalysts peptized by ammonia showed higher activity, and the coexistence of ammonia and boron increased the slab length of active component while decreasing the stacking number. Boron-containing catalysts exhibited higher activity in HDS reactions.
Article
Chemistry, Multidisciplinary
E. A. Avdeenko, K. A. Nadeina, O. V. Klimov, T. V. Larina, E. Yu. Gerasimov, I. S. Golubev, A. S. Noskov
Summary: The influence of different alumina precursors (pseudoboehmites) on the catalytic activity of CoMo/ASA + Al2O3 catalysts in FCC gasoline hydrotreating has been studied. The choice of pseudoboehmite significantly affects the properties of the supports and catalysts, including texture, acidity, mechanical properties, and dispersion of the active phase. The type of pseudoboehmite also affects the amount of tetrahedral cobalt in the catalysts, thereby influencing the surface activity. Additionally, a linear relationship is found between the ratio of medium and weak acid sites and catalyst selectivity.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Physical
Ludek Kaluza, Kveta Jiratova, Alla A. Spojakina, Jana Balabanova, Dana Gulkova, Martin Kostejn, Radostina Palcheva, Georgi Tyuliev, Radek Fajgar
Summary: Recently, there has been an increasing demand for simultaneous hydrotreatment of various petroleum fractions and plant feedstocks. Supported NiMo oxide catalysts were prepared using an alumina support impregnated with Anderson's molybdenum salt and lithium carbonate. The experimental data showed that lithium had a positive effect on the parallel HDS/HDO reactions and a negative effect on the HDS of thiophene.
Article
Chemistry, Multidisciplinary
Chutanan Muangsuwan, Warangthat Kriprasertkul, Sakhon Ratchahat, Chen-Guang Liu, Pattaraporn Posoknistakul, Navadol Laosiripojana, Chularat Sakdaronnarong
Summary: The hydrodeoxygenation process of bio-oil derived from palm empty fruit bunch in glycerol was studied using Ni- and Co-based catalysts on an Al2O3 support in a rotating-bed reactor. The NiMo/Al2O3 catalyst showed the most promising results with improved bio-oil quality in terms of oxygen reduction and increased high heating value. The olefins cyclopentanone and cyclopentene were identified as the main components in the hydrodeoxygenated bio-oil, which can be used for the synthesis of jet-fuel range cycloalkanes.
Article
Energy & Fuels
Atsushi Ishihara, Mizuki Kobayashi, Tadanori Hashimoto
Summary: Among the tested catalysts, Pt/CM exhibited the highest conversion rate of soybean oil at 460 degrees Celsius under 1.0 MPa of hydrogen, attributed to its higher acid sites and more stable pore structure compared to other catalysts.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Article
Energy & Fuels
Dmitry A. Sukhorukov, Roman G. Kukushkin, Maria V. Alekseeva (Bykova), Olga A. Bulavchenko, Olesya O. Zaikina, Mikhail E. Revyakin, Maxim O. Kazakov, Vadim A. Yakovlev
Summary: This paper focuses on upgrading sewage sludge-derived pyrolysis oil through hydrotreatment using catalysts. The results show that effective heteroatom removal can be achieved, especially with the NiMoPS/Al2O3 catalyst at 400 degrees C. Additionally, the catalysts used in the process accumulate certain impurities, indicating the importance of selecting appropriate catalysts and construction materials for further study.
Article
Biochemistry & Molecular Biology
Kyoung-Hwan Choi, Dong-Jin Seo, Yu-Jin Kim, San-Seong Cho, Yu-Jin Han, Inchan Yang, Chel-Woo Kim, Kyeongseok Oh, Jung-Chul An, Joo-Il Park
Summary: The removal of nitrogen from coal tar pitch (CTP) was evaluated using NiMo/γ-alumina and CoMo/γ-alumina catalysts. Mass spectrometry was used to analyze the chemical species of CTP and the treated products. The results showed that a single-stage hydrodenitrogenation treatment had low nitrogen removal performance, but combining hydrodesulfurization and hydrodenitrogenation resulted in significantly improved nitrogen removal performance.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Applied
I Vazquez-Garrido, A. Lopez-Benitez, A. Guevara-Lara, G. Berhault
Summary: The addition of 1 mol% manganese to Al2O3 support has been shown to enhance the performance of NiMo catalysts for the hydroconversion of soybean oil, due to the stabilization of manganese oxide species aiding in the redispersion of the active phase.
Article
Environmental Sciences
Jaroslav Mosko, Michael Pohorely, Tomas Cajthaml, Michal Jeremias, Ana A. Robles-Aguilar, Siarhei Skoblia, Zdenek Beno, Petra Innemanova, Lucie Linhartova, Klara Michalikova, Erik Meers
Summary: The study focused on using slow pyrolysis to treat organic pollutants in stabilized sewage sludge, finding that temperatures above 600 degrees Celsius effectively removed the majority of organic pollutants. It was proposed that high temperature (>600 degrees Celsius) slow pyrolysis can satisfactorily remove organic pollutants from resulting sludge-char, making it a safe soil improver.
Article
Chemistry, Analytical
Jaroslav Mosko, Michael Pohorely, Siarhei Skoblia, Radek Fajgar, Pavel Straka, Karel Soukup, Zdenek Beno, Josef Fartak, Olga Bicakova, Michal Jeremias, Michal Syc, Erik Meers
Summary: Pyrolysis of sewage sludge at 400-800 degrees C showed that increasing temperature led to higher phosphate and metaphosphate content, and lower reduced P species content; higher temperature also increased sulfide content and decreased sulfate and sulfite content; the effect on nitrogen species was minimal. Raman spectroscopy and NMR revealed significant contribution of graphite and (poly) aromatic hydrocarbons to the organic structure of sludge-chars.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Review
Energy & Fuels
Martin Stas, Milos Auersvald, Petr Vozka
Summary: Raw pyrolysis bio-oils have potential to be used as liquid biofuels or raw materials for advanced transportation biofuels. Detailed chemical characterization of bio-oils is challenging due to their complex composition. Two-dimensional gas chromatography (2D-GC) can help identify unknown bio-oil compounds.
Article
Chemistry, Analytical
Milos Auersvald, Martin Stas, Pavel Simacek
Summary: This paper investigates the determination of phenols and cyclic olefins in bio-oils, finding a feasible method through analysis of 140 oxygenates and optimization of chromatographic separation. A good correlation between phenols and oxygen content was discovered, providing a reliable way to quantify these compounds in hydrotreated bio-oils.
Article
Chemistry, Physical
Petr Straka, Josef Blazek, Daria Toullis, Tomas Ihnat, Pavel Simacek
Summary: This study compares the hydrotreating of petroleum distillates and a mixture containing rapeseed oil. It found that complete conversion of rapeseed oil and minimum aromatic hydrocarbon content in the products can be achieved under different reaction conditions, while sulfur content can be controlled within acceptable levels under appropriate reaction conditions.
Article
Chemistry, Physical
Josef Blazek, Daria Toullis, Petr Straka, Martin Stas, Pavel Simacek
Summary: This study demonstrates the co-hydrotreating of rapeseed oil and a petroleum feedstock, showing that the catalyst had high hydrogenation activity and the hydrogen consumption increased with pressure. The conversion of rapeseed oil required higher hydrogen consumption compared to the hydrotreating of the petroleum feedstock.
Article
Chemistry, Multidisciplinary
Lukas Matejovsky, Martin Stas, Jan Macak
Summary: Ethanol-based E5 and E10 fuels are commonly used in gasoline engines, but can cause corrosion to engine parts like mild steel when contaminated. This study introduced modified electrochemical impedance spectroscopy (EIS) and polarization characteristics measurements (Tafel scan-TS) using tetrabutylammonium tetrafluoroborate (TBATFB) as an electrolyte to improve conductivity and successfully perform corrosion tests on E5 and E10 fuels. This modification offers a significant extension for studying steel corrosion in ethanol-gasoline blends.
Article
Energy & Fuels
Petr Baros, Lukas Matejovsky, Jan Macak, Martin Stas, Milan Pospisil
Summary: Bioalcohols are promising renewable alternative fuels to gasoline in road transport. This study evaluated the corrosion aggressiveness of alcohol-gasoline blends to mild steel and stainless steel. It was found that stainless steel exhibited high corrosion resistance in all tested fuels, while mild steel showed good corrosion resistance only in pure alcohol-gasoline blends. Furthermore, butanol-gasoline blends were found to be more aggressive to mild steel, especially after contamination.
Article
Energy & Fuels
Lukas Matejovsky, Petr Baros, Martin Stas, Milan Pospisil, Jan Macak
Summary: This study investigates the effect of different alcohol content in ethanol-gasoline and butanol-gasoline blends on mild steel corrosion, finding that contamination increases the aggressiveness of the fuels against mild steel, particularly in butanol-gasoline blends. It was observed that in ethanol-gasoline blends with an ethanol content of 60% or higher, an initial quasi-passive state was present but not persistent. Pitting corrosion was observed in fuels with ethanol content of 100% and in blends containing 40% or more butanol.
Article
Energy & Fuels
Petr Baros, Lukas Matejovsky, Martin Stas, Jan Macak, Jan Vyslouzil, Milan Pospisil
Summary: Alcohol-gasoline blends (AGBs) have higher corrosion aggressiveness compared to conventional petroleum-based fuels. This study investigated the inhibitory effects of the corrosion inhibitor diethylenetriamine (DETA) in contaminated alcohol-gasoline fuel and found that it was 99% efficient in reducing corrosion.
Article
Energy & Fuels
Hugo Kittel, Katerina Chrudimska, Daniel Kadlecek, Martin Psenicka, Pavel Simacek
Summary: The objective of this study was to re-distill hydrocracked kerosene and determine the dependence of jet fuel parameters on the mean boiling point of the cuts. The properties of the analyzed cuts deteriorated with increasing mean boiling point, and cuts with higher mean boiling points did not meet jet fuel specifications. Aromatics were found to be crucial in controlling the distillation range, and the low freezing point characteristic of the narrow cuts resulted in a synergy when blended with other kerosene. This research provides new insights into the characteristics of hydrocracked kerosene.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Chemical
Hugo Kittel, Jiri Horsky, Pavel Simacek
Summary: The popularity of air transport is increasing due to its speed, comfort, and extensive network. This has led to a high demand for jet fuel, which is also facing scrutiny for its impact on the environment. To address this issue, it is necessary to blend alternative petroleum fractions with sustainable aviation components in oil refineries. Different samples of alternative jet fuel were tested for their specific properties and compared to standard Jet A-1 kerosene. The properties varied significantly, but correlations were found, indicating potential synergies in blending these components.