Готові списки джерел за темами / Catalytic ketonisation

Добірка наукової літератури з теми "Catalytic ketonisation"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Catalytic ketonisation"

Gliński, Marek, and Michał Kaszubski. "Catalytic ketonisation over oxide catalysts." Reaction Kinetics and Catalysis Letters 82, no. 1 (2004): 157–63. http://dx.doi.org/10.1023/b:reac.0000028817.05005.c6.

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Parida, Kulamani, and Himangshu Kumar Mishra. "Catalytic ketonisation of acetic acid over modified zirconia." Journal of Molecular Catalysis A: Chemical 139, no. 1 (February 1999): 73–80. http://dx.doi.org/10.1016/s1381-1169(98)00184-8.

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Bayahia, Hossein. "Catalytic Activity of Cobalt-Molybdenum in Gas-Phase Ketonisation of Pentanoic Acid." Science Journal of Chemistry 6, no. 1 (2018): 11. http://dx.doi.org/10.11648/j.sjc.20180601.12.

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Bayahia, Hossein, Elena Kozhevnikova, and Ivan Kozhevnikov. "High catalytic activity of silicalite in gas-phase ketonisation of propionic acid." Chemical Communications 49, no. 37 (2013): 3842. http://dx.doi.org/10.1039/c3cc41161c.

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Gooßen, Lukas J., Patrizia Mamone, and Christoph Oppel. "Catalytic Decarboxylative Cross-Ketonisation of Aryl- and Alkylcarboxylic Acids using Magnetite Nanoparticles." Advanced Synthesis & Catalysis 353, no. 1 (December 15, 2010): 57–63. http://dx.doi.org/10.1002/adsc.201000429.

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Al-ghamdi, Mohammed, and Hossein Bayahia. "Zinc-Chromium oxide catalyst for gas-phase ketonisation of pentanoic acid." Mediterranean Journal of Chemistry 6, no. 2 (November 13, 2016): 1–6. http://dx.doi.org/10.13171/mjc62/01611080121-bayahia.

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Анотація:

Oxides of Zinc and Chromium mixed catalyst with different atomic ratios of Zinc and Chromium were tested in the ketonisation of pentanoic acid in the gas phase. These catalysts were active to form 5-nonanone, at 300 – 400 oC and ambient pressure. It was found that Zn-Cr with an atomic ratio (10:1) gave the best catalytic performance in comparison with other oxides with higher or lower atomic ratio of Zn and Cr mixed oxides, ZnO and Cr2O3. In this test, Zn-Cr (10:1) gave 82% of selectivity for 5-nonanone as the main product at 86% of conversion of the acid at 350oC. The catalyst showed stable performance at the best selected conditions with a small decrease in acid conversion. For catalyst characterization, BET surface area and porosity technique, X-ray diffraction and DRIFTS of pyridine adsorption were used.

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Al-ghamdi, Mohammed, and Hossein Bayahia. "Zinc-Chromium oxide catalyst for gas-phase ketonisation of pentanoic acid." Mediterranean Journal of Chemistry 6, no. 2 (November 13, 2016): 1. http://dx.doi.org/10.13171/mjc61/01611081426-bayahia.

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Анотація:

Oxides of Zinc and Chromium mixed catalyst with different atomic ratios of Zinc and Chromium were tested in the ketonisation of pentanoic acid in the gas phase. These catalysts were active to form 5-nonanone, at 300 – 400 oC and ambient pressure. It found that Zn-Cr with an atomic ratio (10:1) gave the best catalytic performance in comparison with other oxides with higher or lower atomic ratio of Zn and Cr mixed oxides, ZnO and Cr2O3. In this test, Zn-Cr (10:1) gave 82% selectivity of 5-nonanone as the main product at 86% conversion of acid at 350oC. The catalyst showed stable performance at the best selected conditions with a small decrease of acid conversion. For catalyst characterization, BET surface area and porosity technique, X-ray diffraction and DRIFTS of pyridine adsorption were used.

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Al-ghamdi, Mohammed, and Hossein Bayahia. "Zinc-Chromium oxide catalyst for gas-phase ketonisation of pentanoic acid." Mediterranean Journal of Chemistry 6, no. 2 (November 13, 2016): 1. http://dx.doi.org/10.13171/mjc62/01611081426-bayahia.

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Анотація:

Oxides of Zinc and Chromium mixed catalyst with different atomic ratios of Zinc and Chromium were tested in the ketonisation of pentanoic acid in the gas phase. These catalysts were active to form 5-nonanone, at 300 – 400 oC and ambient pressure. It found that Zn-Cr with an atomic ratio (10:1) gave the best catalytic performance in comparison with other oxides with higher or lower atomic ratio of Zn and Cr mixed oxides, ZnO and Cr2O3. In this test, Zn-Cr (10:1) gave 82% selectivity of 5-nonanone as the main product at 86% conversion of acid at 350oC. The catalyst showed stable performance at the best selected conditions with a small decrease of acid conversion. For catalyst characterization, BET surface area and porosity technique, X-ray diffraction and DRIFTS of pyridine adsorption were used.

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Sanahuja-Parejo, Olga, Alberto Veses, José Manuel López, Ramón Murillo, María Soledad Callén, and Tomás García. "Ca-based Catalysts for the Production of High-Quality Bio-Oils from the Catalytic Co-Pyrolysis of Grape Seeds and Waste Tyres." Catalysts 9, no. 12 (November 26, 2019): 992. http://dx.doi.org/10.3390/catal9120992.

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Анотація:

The catalytic co-pyrolysis of grape seeds and waste tyres for the production of high-quality bio-oils was studied in a pilot-scale Auger reactor using different low-cost Ca-based catalysts. All the products of the process (solid, liquid, and gas) were comprehensively analysed. The results demonstrate that this upgrading strategy is suitable for the production of better-quality bio-oils with major potential for use as drop-in fuels. Although very good results were obtained regardless of the nature of the Ca-based catalyst, the best results were achieved using a high-purity CaO obtained from the calcination of natural limestone at 900 °C. Specifically, by adding 20 wt% waste tyres and using a feedstock to CaO mass ratio of 2:1, a practically deoxygenated bio-oil (0.5 wt% of oxygen content) was obtained with a significant heating value of 41.7 MJ/kg, confirming its potential for use in energy applications. The total basicity of the catalyst and the presence of a pure CaO crystalline phase with marginal impurities seem to be key parameters facilitating the prevalence of aromatisation and hydrodeoxygenation routes over the de-acidification and deoxygenation of the vapours through ketonisation and esterification reactions, leading to a highly aromatic biofuel. In addition, owing to the CO2-capture effect inherent to these catalysts, a more environmentally friendly gas product was produced, comprising H2 and CH4 as the main components.

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Jahangiri, Hessam, Amin Osatiashtiani, Miloud Ouadi, Andreas Hornung, Adam F. Lee, and Karen Wilson. "Ga/HZSM-5 Catalysed Acetic Acid Ketonisation for Upgrading of Biomass Pyrolysis Vapours." Catalysts 9, no. 10 (October 11, 2019): 841. http://dx.doi.org/10.3390/catal9100841.

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Анотація:

Pyrolysis bio-oils contain significant amounts of carboxylic acids which limit their utility as biofuels. Ketonisation of carboxylic acids within biomass pyrolysis vapours is a potential route to upgrade the energy content and stability of the resulting bio-oil condensate, but requires active, selective and coke-resistant solid acid catalysts. Here we explore the vapour phase ketonisation of acetic acid over Ga-doped HZSM-5. Weak Lewis acid sites were identified as the active species responsible for acetic acid ketonisation to acetone at 350 °C and 400 °C. Turnover frequencies were proportional to Ga loading, reaching ~6 min−1 at 400 °C for 10Ga/HZSM-5. Selectivity to the desired acetone product correlated with the weak:strong acid site ratio, being favoured over weak Lewis acid sites and reaching 30% for 10Ga/HZSM-5. Strong Brønsted acidity promoted competing unselective reactions and carbon laydown. 10Ga/HZSM-5 exhibited good stability for over 5 h on-stream acetic acid ketonisation.

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