Engenharia Química
URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/25
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3 resultados
Resultados da Pesquisa
- Metal–organic frameworks as catalysts and biocatalysts for methane oxidation: The current state of the art(2023-04-05) ANDRADE, L. S.; LIMA, H. H.L. B.; SILVA, C. T. P.; AMORIM, W. L. N.; João Guilherme Rocha Poço; LOPEZ-CASTILLO, A.; KIRILLOVA, M. V.; CARVALHO, W. A.; KIRILLOV, A. M.; MANDELLI, D.© 2023 Elsevier B.V.As the main component of natural and shale gas, seabed clathrates, and biogas, methane (CH4) is an abundant C1 resource for added-value chemicals. CH4 is of critical importance to society as a universal and renewable (biogas) fuel, but it is also a potent greenhouse gas that causes global warming and climate change. Given such a multifaceted occurrence and uses of CH4, the research on its chemical transformations with environmental and sustainability significance represents a frontier direction of modern chemistry that can address many societal challenges. Metal-organic frameworks (MOFs) and derived materials received outstanding attention because of unique features such as structural versatility and tunability, low density, high porosity, and giant specific surface area, which all contributed to their auspicious applications in heterogeneous catalysis. With regard to methane, MOFs are unique and very promising materials for CH4 storage, separation, sensing, and various types of catalytic transformations. The main goal of this work consisted in surveying all the existing literature on the heterogeneous selective oxidation of methane catalyzed by MOFs, aiming at describing the current state of the art and highlighting other aspects, challenges, and perspectives closely relevant to this research area. This review thus focuses on the application of MOFs and their bioinspired or biomimetic analogs (bioMOFs) as heterogeneous catalysts for the selective oxidation of methane. The review is divided into logical sections: (i) methane sources, (ii) current status in methane oxidation, (iii) natural biochemical and enzymatic methane oxidation reactions and their relevance for inspiring the design of advanced catalysts as bioMOFs, (iv) methane oxidation reactions mediated by enzyme-mimicking bioMOFs, (v) MOFs as porous supports for catalytically active species and their catalytic use in methane oxidation, and (vi) computational chemistry toward unveiling MOF-catalyzed methane oxidation mechanisms and predicting prospective catalytic systems. This study will contribute to the advancement and future development of new MOF-based catalytic systems for various methane reactions as a frontier direction of modern chemistry and sustainable catalysis.
- An overview of heavy oil properties and its recovery and transportation methods(2014-07-01) SANTOS, R. G.; LOH, W.; BANNWART, A. C.; TREVISAN, O. V.© 2014, Assoc. Brasiliera de Eng. Quimica / Braz. Soc. Chem. Eng. All rights reserved.Unconventional oils - mainly heavy oils, extra heavy oils and bitumens - represent a significant share of the total oil world reserves. Oil companies have expressed interest in unconventional oil as alternative resources for the energy supply. These resources are composed usually of viscous oils and, for this reason, their use requires additional efforts to guarantee the viability of the oil recovery from the reservoir and its subsequent transportation to production wells and to ports and refineries. This review describes the main properties of high-viscosity crude oils, as well as compares traditional and emergent methods for their recovery and transportation. The main characteristics of viscous oils are discussed to highlight the oil properties that affect their flowability in the processes of recovery and pipeline transportation. Chemical composition is the starting point for the oil characterization and it has major impact on other properties, including key properties for their dynamics, such as density and viscosity. Next, enhanced oil recovery (EOR) methods are presented, followed by a discussion about pipeline and transportation methods. In addition, the main challenges to achieve viable recovery and transportation of unconventional oils are compared for the different alternatives proposed. The work is especially focused on the heavy oils, while other hydrocarbon solid sources, such as oil sands and shale oil, are outside of the scope of this review.
- Tire waste management: an overview from chemical compounding to the pyrolysis-derived fuels(2020-05-01) Ronaldo Santos; ROCHA, C.L.; FELIPE, F.L.S.; CEZARIO, F.T.; CORREIA, P.J.; REZAEI-GOMAR, S.© 2020, Springer Japan KK, part of Springer Nature.The management of tire residues is still a challenge for the industry and governments due to the great volume occupied by the tires and the difficulty of recycling associated with the intricate structure. Thermal degradation is a promisor via to avoid the improper disposal of scrap tires. The waste tire conversion into chemicals by means of pyrolysis yields high added-value products that can be used as reaction precursors and fuels. Tire-derived pyrolysis oil can also be mixed with conventional fossil fuels, producing blends with improved fuel properties and reduced cost. This survey describes the tire compound and the feasibility to convert scrap tire into chemical components as an alternative recycling method, focusing on the tire-derived oil. Pyrolysis is discussed as a method to the tire recovery and reuse, preventing environmental damages and contributing to the sustainable cyclic process. The liquid fraction derived from tire pyrolysis is a complex mixture containing valuable compounds, such as alkyl and alkenyl hydrocarbons, polycyclic aromatics, and terpenes. The assessment of the main properties of tire-derived fuels for industrial and automotive applications are highlighted.