Bibliografias temáticas / Spent catalyst characterization

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Literatura científica selecionada sobre o tema "Spent catalyst characterization"

Autor: Grafiati

Publicado: 22 de julho de 2021

Última modificação: 29 de julho de 2025

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Artigos de revistas sobre o assunto "Spent catalyst characterization"

Yunes, Simón, Jeffrey Kenvin, and Antonio Gil. "On the Application of an In Situ Catalyst Characterization System (ICCS) and a Mass Spectrometer Detector as Powerful Techniques for the Characterization of Catalysts." Physchem 3, no. 2 (2023): 220–31. http://dx.doi.org/10.3390/physchem3020015.

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The in situ characterization of catalysts provides important information on the catalyst and the understanding of its catalytic performance and selectivity for a specific reaction. Temperature programmed analyses (TPX) techniques for catalyst characterization reveal the role of the support on the stabilization and dispersion of the active sites. However, these can be altered at high temperatures since sintering of active species can occur as well as possible carbon deposition which hinders the active species and deactivates the catalyst. The in situ characterization of the spent catalyst, howe

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Yunes, Simon, Urim Pearl Kim, Hoang Nguyen, and Jeffrey Kenvin. "Exploiting In-Situ Characterization for a Sabatier Reaction to Reveal Catalytic Details." Chemistry 3, no. 4 (2021): 1157–65. http://dx.doi.org/10.3390/chemistry3040084.

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In situ characterization of catalysts provides important information on the catalyst and the understanding of its activity and selectivity for a specific reaction. TPX techniques for catalyst characterization reveal the role of the support on the stabilization and dispersion of the active sites. However, these can be altered at high temperature since sintering of active species can occur as well as possible carbon deposition through the Bosch reaction, which hinders the active species and deactivates the catalyst. In situ characterization of the spent catalyst, however, may expose the causes f

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Nagar, Neha, Himanshi Garg, and Chandra Sekhar Gahan. "Characterization of different types of petroleum refinery spent catalyst followed by microbial mediated leaching of metal values." Chemical Reports 3, no. 1 (2021): 177–87. http://dx.doi.org/10.25082/cr.2021.01.002.

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The present study aims for characterization and classification of five different spent petroleum refinery catalysts followed by metal recovery via bioleaching. The nomenclature given to the different spent catalyst (SC) is SC1, SC2, SC3, SC4 and SC5 collected from an Indian petroleum refinery. All spent catalysts were crushed and ground prior to their characterization by X-Ray Fluorescence for chemical composition followed by X-Ray Diffraction and Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy for their mineralogy. Further, all five spent catalysts were classified based upon

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Saputra, Edy, Panca Setia Utama, Irdoni HS, et al. "Spent Bleaching Earth Supported CeFeO3 Perovskite for Visible Light Photocatalytic Oxidation of Methylene Blue." Journal of Applied Materials and Technology 1, no. 2 (2020): 81–87. http://dx.doi.org/10.31258/jamt.1.2.81-87.

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Dyes substances from the textile industry wastewater are internationally classified as poisonous substances, and they cause a severe threat to humans being and other living things, even at low concentrations. Therefore, this waste has to be treated before discharge to the environment. One of the most effective processes for degrading dyes is photocatalytic oxidation. Two different pretreatments of Spent bleaching earth (SBE) from palm oil refinery plant were applied to produce catalyst supports. The SBEe support was prepared by extraction using n-hexane, SBEc by calcination at 500 oC, and then

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Tsavatopoulou, Vasiliki D., Andriana F. Aravantinou, John Vakros, and Ioannis D. Manariotis. "Conversion of Scenedesmus rubescens Lipid into Biodiesel by Biochar of Different Origin." Catalysts 11, no. 9 (2021): 1116. http://dx.doi.org/10.3390/catal11091116.

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One of the most recent applications studied in recent years is the use of biochar as a catalyst for the conversion of oils into biodiesel. The scope of this work was to evaluate the efficiency of biochars as heterogeneous catalysts for the conversion of Scenedesmus rubescens lipids into biodiesel. Biochar from different materials were employed, namely, malt spent rootlets (MSR), coffee spent grounds (CSG), and olive kernels (OK). Materials were charred at two temperatures (400 and 850 °C) in order to examine the effect of pyrolysis temperature. Homogeneous catalysts such as sulfuric acid and s

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Kliewer, C. E., M. M. Disko, S. L. Soled, and G. J. DeMartin. "A Reactor for “Ex-Situ” TEM Catalyst Characterization." Microscopy and Microanalysis 5, S2 (1999): 926–27. http://dx.doi.org/10.1017/s1431927600017955.

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The microstructural and chemical characterization of catalysts is not only integral to their initial development but also to understanding and controlling their behavior over time. To better elucidate the morphology of these materials and relate physical properties to catalytic properties (e.g., activity, selectivity, etc.), “ex-situ” methods for studying catalysts under reactive conditions have been developed.Because conventional transmission electron microscopy (CTEM) is conducted under high vacuum conditions, it is difficult to replicate the exact chemical environment of a catalyst (e.g., h

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Yong, Xiaojing, Hui Su, Nana Zhao, Zhengwei Jin, Min Yao, and Yulong Ma. "Xylene and n-Hexane Adsorption Performance of a Waste Methanol-to-Propylene Catalyst under Acid-Base Treatment." Catalysts 12, no. 9 (2022): 1028. http://dx.doi.org/10.3390/catal12091028.

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Spent methanol-to-propylene (MTP) catalysts have a large specific surface area and high porosity but are usually directly disposed of in landfills, and recycling is rare. In this study, spent MTP catalyst was moderately dealuminized with acids and etched with an alkali solvent to increase its specific surface area. A novel adsorbent was obtained. XRD, SEM, FT-IR, XRD, XRF, and MAS-NMR characterization shows that the adsorbent maintains a typical ZSM-5 zeolite structure, and the dealumination effect of H2C2O4 is better than that of HCl. HCl mainly removes the framework aluminum of the molecular

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Esla, Jaggu D., Abdulsalami S. Kovo, Zakariyah Abdullahi Abiodun, and Kamaldeen Olayinka Suleiman. "Thermal and Structural Characterization of Coke Deposition on Spent NiMo Catalyst Used During Catalytic Upgrading of Heavy Oil." Journal of Engineering Research and Reports 26, no. 12 (2024): 11–23. http://dx.doi.org/10.9734/jerr/2024/v26i121336.

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Catalyst deactivation has become a major concern in the refining industry globally. The deactivation of hydroprocessing catalyst by coke deposition reduces its useful life, the on-stream time of the process involved and the profitability of upgrading heavy oils to useful products. There are various methods used in thermal and structural characterization but for the purpose of this research journal, Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) were carried out on both fresh and spent NiMo catalyst. The TGA re

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Stellato, Michael J., Giada Innocenti, Andreas S. Bommarius, and Carsten Sievers. "Pore Blocking by Phenolates as Deactivation Path during the Cracking of 4-Propylphenol over ZSM-5." Catalysts 11, no. 6 (2021): 721. http://dx.doi.org/10.3390/catal11060721.

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Cracking of propyl side chains from 4-propylphenol, a model compound for lignin monomers, is studied for a commercial ZSM-5 zeolite catalyst. The decline of 4-propylphenol conversion with time on stream can be delayed by co-feeding water. FTIR spectroscopy shows the formation of chemisorbed phenolates during reactions and significant amounts of phenolics are detected by GC-MS of the extract from the spent catalysts. Thus, chemisorbed phenolates are identified as the main reason for deactivation in the absence of water. Regardless of the amount of co-fed water, substituted monoaromatics and pol

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Alharbi, Walaa, Khadijah H. Alharbi, L. Selva Roselin, R. Savidha, and Rosilda Selvin. "Nanosized Silica-Supported 12-Tungstophosphoric Acid: A Highly Active and Stable Catalyst for the Alkylation of p-Cresol with tert-Butanol." Catalysts 13, no. 11 (2023): 1432. http://dx.doi.org/10.3390/catal13111432.

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12-Tungstophosphoric acid supported on nanosilica (TPA/SiO2) was employed as a catalyst for the tertiary butylation of p-cresol using tertiary butanol as an alkylating agent. The TPA/SiO2 catalyst was synthesized using the wet impregnation method followed by steaming at 150 °C for 6 h. The catalysts were characterized by means of X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) analysis. The surface acidity of the untreated and steamed catalysts was characterized via FTIR and DSC thermal analysis using pyridine as a probe molecule. The fresh and spent catalysts were character

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Teses / dissertações sobre o assunto "Spent catalyst characterization"

(11150073), Abhijit D. Talpade. "Pyrolysis based processing of biomass and shale gas resources to fuels and chemicals." Thesis, 2021.

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<div>Thermochemical processing using fast-pyrolysis technology has been used to upgrade feedstocks like biomass and natural gas and more recently studied for plastic recycling. This work aims to improve the selectivity to desired products from a pyrolysis process through better catalysts and reactor design.</div><div>Fast-pyrolysis of biomass to fuels is considered a promising technology due to the higher yields to liquid fuel products. However, the process suffers from low carbon efficiency to hydrocarbon products due to carbon losses to biochar, accounting for 25-40 wt.% of the product strea

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Capítulos de livros sobre o assunto "Spent catalyst characterization"

Yang, Yongbin, Long Hu, Qian Li, Bin Xu, Xuefei Rao, and Tao Jiang. "Recovery of Palladium from Spent Pd/Al2O3 Catalyst by Hydrochloric Acid Leaching." In Characterization of Minerals, Metals, and Materials 2016. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48210-1_38.

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Yang, Yongbin, Long Hu, Qian Li, Bin Xu, Xuefei Rao, and Tao Jiang. "RECOVERY OF PALLADIUM FROM SPENT Pd/Al2O3 CATALYST BY HYDROCHLORIC ACID LEACHING." In Characterization of Minerals, Metals, and Materials 2016. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119263722.ch38.

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Li, Qian, Xuefei Rao, Yongbin Yang, Bin Xu, Long Hu, and Tao Jiang. "Recovery of Palladium and Aluminum from Spent Catalysts by Roasting-Leaching." In Characterization of Minerals, Metals, and Materials 2016. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48210-1_65.

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Qian, Li, Rao Xuefei, Yongbin Yang, Xu Bin, Hu Long, and Tao Jiang. "Recovery of Palladium and Aluminum From Spent Catalysts by Roasting-Leaching." In Characterization of Minerals, Metals, and Materials 2016. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119263722.ch65.

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"Characterization of Coke on Spent Resid Catalyst from Ebullating Bed Service and its Effect on Activity." In Hydrotreating Technology for Pollution Control. CRC Press, 1996. http://dx.doi.org/10.1201/9781482273540-24.

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Gaona, William, Diana Duarte, Carlos Medina, and Luis Almanza. "Coke Characterization by Temperature-Programmed Oxidation of Spent FCC Catalysts That Process Heavy Feedstock." In Chemical Industries. CRC Press, 2010. http://dx.doi.org/10.1201/b10380-11.

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Rahman, Ataur, and Motaheruddin Ahmed. "Dehydrogenation of propane over chromia/alumina: A comparative characterization study of fresh and spent catalysts." In catalysts in Petroleum Refining and Petrochemical Industries 1995, Proceedings of the 2nd International Conference on Catalysts in Petroleum refining and Petrochemical Industries. Elsevier, 1996. http://dx.doi.org/10.1016/s0167-2991(96)80041-3.

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