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Essential reference for researchers and experts in industry highlighting the rapidly growing field of hydroxyapatite-based catalysts and their application in various chemical processes.Hydroxyapatite (Ca10(PO4)6(OH)2) is the main mineral component of human and animal bones. It is largely applied in the field of biomaterials due to its biocompatibility. Recently, hydroxyapatite-based compounds have especially gained a lot of attention by researchers in catalysis, as they are versatile and have shown precious properties of a good catalyst and catalyst support such as excellent ion-exchange capacity, high porosity, very low water solubility, controlled basicity/acidity, and good thermal stability at high temperatures.Design and Applications of Hydroxyapatite-Based Catalysts gives a detailed overview of the synthesis, characterization, and use of hydroxyapatite-based materials in catalysis. It covers synthetic hydroxyapatites (from pure chemicals or waste), natural apatites, and materials from eggshells and animal bones. The application of hydroxyapatite-based catalysts in selective oxidation, deoxygenation, selective hydrogenation, dehydrogenation reactions, organic synthesis, as well as reforming processes and production of energy carriers is reviewed. Moreover, electrocatalysis and photocatalysis using hydroxyapatite-based materials are discussed. Kinetic and mechanism studies of various chemical processes over hydroxyapatite-based catalysts are also presented. This is the first book solely dedicated to hydroxyapatite-based materials and their use in catalysis. Covers synthesis and characterization, surface and structure study, kinetic and mechanism aspects, and various applications in heterogeneous catalysis, electrocatalysis, and photocatalysis. Aimed at further stimulating research on hydroxyapatite-based catalysts, Design and Applications of Hydroxyapatite-Based Catalysts is an indispensable source-of-information for researchers in academia and industry working in catalysis.

International audience; It is well established that the transport sector contributes significantly to the global warming because of the high Carbon dioxide emission rate. A significant effort is being made in aeronautics for instance to green this sector. Green and decarbonized hydrogen processes taken at different Technology Readiness Levels (TRL) are considered in this article It mainly concerns co-electrolysis of water with CO2, pyrolysis and gasification of biomass and biowaste, reforming of biogas and biological conversion of both biomass and biowaste.; Le secteur du transport a un impact important sur les émissions de gaz carbonique, contribuant de manière significative au changement climatique. Dans ce contexte, le secteur aéronautique entreprend des efforts importants pour améliorer son empreinte carbone par l’utilisation de carburants verts ou décarbonés. L’hydrogène apparaît comme une solution d’avenir en tant que carburant pour les systèmes aéronautiques (avions et dispositifs au sol). Cet article aborde les procédés de production d’hydrogène renouvelable et vert à partir de carbone issu de la photosynthèse. Les procédés comme la co-électrolyse de l’eau, la pyrolyse et la gazéification de la biomasse et des biodéchets, le reformage du biogaz et la conversion biologique de la biomasse et des biodéchets.

National audience; The company Eco-Tech Ceram developed an industrial scale thermal storage designed to recover waste heat up to 600°C:the Eco-Stock®.This unit of 2 MWhThcontains 16 tons of refractory ceramic. The robustness regardingthe variation of inlet temperature and flowrate is tested to show that the Eco-Stock®matches with the constraints of waste heat sources,involving sharp variation temperature and flowrate but also stand-by period.; La sociétéEco-Tech Ceram a développé un stockage thermique de taille industrielle pour la valorisation dechaleur fatale jusqu’à 600°C: l’Eco-Stock®. Il s’agit d’une unité de 2 MWhTh, contenant16 t de céramique réfractaire. La robustesse aux variations de température et de débit est testée afin de montrer que l’Eco-Stock®est adapté aux contraintes des gisements de chaleur fatale,impliquant defortes variations de température, de débit et des périodes de stand-by.

International audience

Issu de : IOP Conference Series: Earth and Environmental Science, Volume 505, 2020 6th International Conference on Environment and Renewable Energy February 24-26, 2020. Hanoi, Vietnam; International audience; It is our great pleasure to welcome all of you to the 5th International Conference on Environment and Renewable Energy (ICERE 2020) 28-30th September, 2020, Hanoi, Vietnam. ICERE 2020 is dedicated to issues related to Environment and Renewable Energy.This conference program is highlighted by four Keynote Speakers: Associate Professor Nguyen Thi Ha from Faculty of Environmental Sciences, VNU University of Science, Vietnam; CEO/Arno A. Evers from Arno A. Evers FAIR-PR in Munich, Germany; Assoc. Prof. DAM SAO MAI who is Dean of the Biotechnology and Food Technology Institute, Ho Chi Minh city, Vietnam; Assoc. Prof. Doan PHAM MINH from Ecole Nationale Supérieure des Mines d'Albi-Carmaux Campus Jarlard, Route de Teillet, 81013 Albi, France.There are seven sub-sessions and one poster session with different topics: Energy Materials, New Energy Power Generation, Food Engineering, Energy-Efficient Buildings, Natural Resources, Environmental Engineering, Sustainable Development.This proceeding presents a selection from papers submitted to the conference from universities, research institutes and industries. All papers were subjected to peer-review by conference committee members and international reviewers. The volume is presenting recent advances in the field of Environment and Renewable Energy and various related areas, such as Building Energy Efficiency, Natural Resources, Water Quality Engineering, Water Resources Engineering, Solid Waste Disposal, Environmentally Sustainable Development, Food Engineering, Disaster Management, Renewable Energy, Electrical Engineering. We would like to express our sincere gratitude to organizing committee and the volunteers who have dedicated their time and efforts in planning, promoting, organizing and helping the conference.

International audience; Over the past few decades, the sharp rise in post-consumer plastic and biomass waste has resulted in an ever growing challenge to treat such waste sustainably. Co-pyrogasification of plastics and biomass mixtures, as opposed to separately converting these waste streams, offers several advantages including an improvement in syngas quality and composition (H2/CO ratio) in relation to the desired application, and an easier reactor feeding of plastics. Furthermore, many studies have shown that co-pyrogasification promotes the conversion of waste to gas rather than char and tar. However, in order to achieve the desired product distribution or syngas composition, operating parameters such as the reactor temperature, equivalence ratio (air or oxygen), steam/fuel ratio and catalyst, have to be optimized. Thus, this paper aims to review literature studies on the co-pyrogasification of plastics and biomass by considering various aspects including the process principle, reactors, influence of feedstock characteristics and operating parameters on the products, as well as the synergies observed during the thermoconversion of plastics and biomass mixtures with some reference to coal mixtures when necessary.

International audience; In recent years, the world has witnessed a rapid rise in waste production and energy demand, which has increased interests in waste to energy processes, particularly the co-pyrolysis of wood and plastic waste. Nonetheless, for plastic waste, most research studies narrowly focus on polyolefins because of their abundance in waste streams and their high oil yields from pyrolysis. In this paper, we study the co-pyrolysis of non-polyolefins – polystyrene (PS) and polyvinyl chloride (PVC) – and poplar wood (PW), in order to investigate the synergistic effect of PS and PVC content on product yield, gas specie yield and heating value. The experiments were performed using a fixed-bed reactor, heated to 750 °°C at a rate of 20 °°C/min under nitrogen atmosphere. Our results show that PVC has a large positive synergy on char yield with a maximum value of 8 wt% at 30 wt% PVC content, whereas PS only showed a slightly positive synergy (2.5 wt% maximum). Concerning oil and gas production, PS provides a small synergy. However, PVC showed a significant positive synergy on oil yield with a maximum value of 11 wt% at 50 wt% PVC content, which was linked to a strong negative synergy in gas production. Regarding gas specie yields, the addition of PS led to positive synergies in the formation of H2, CH4, CO and CO2, although insignificant interactions were observed for CxHyCxHy compounds. Furthermore, by comparing the distribution of chloride species in the products of co-pyrolysis with PVC, using experimental and theoretical methods, we discovered that the negative synergy in HCl yield observed was mainly due to the dissolution of HCl in the water fraction of the condensed oil phase, rather than the formation of chlorinated organic compounds, as suggested in previous literature works. Our study therefore consolidates the understanding of the synergistic interactions between wood, PS and PVC co-pyrolysis, under conditions that favour gas production.

International audience; Support effects in heterogeneous catalysis are evolving as an important field of investigation to optimize catalyst properties. The cobalt-based Fischer-Tropsch (FT) catalysts usually consist of metallic cobalt nanocrystallites dispersed on a support material. The present article attempts to survey the progress that has been made over the last couple of decades in the area of support and its surface modification effects in cobalt-based FT synthesis. Different catalyst supports such as alumina, silica, titania, niobia, zirconia, zeolite, ceria, carbon-based materials, silicon carbide, aluminum phosphate, hydrotalcite, metal-organic frameworks, and metal foams are discussed and compared with classical supports like alumina or silica wherever it permits. The properties such as metal-support interaction, support induced size and morphology of cobalt nanocrystallites (textural properties of the support), change in electronic properties of the cobalt clusters, and acid-base nature of the support are examined, and wherever possible the activity and/or selectivity in FT synthesis were discussed. This review also summarizes findings of new and promising supports for FT catalysts. A guidance for support modifications and support choice as a function of the product selectivity in FT process was also proposed.

International audience; No abstract

Article pré-publication à la conférence "International Forum on Green Technology and Management IFGTM 2015" à Hue, Vietnam; Hydrogen sulfide (H2S), which was formed from both natural and anthropogenic processes, is one of the most toxic contaminants affecting machine, people health, and ecosystem. Activated carbon and its derivatives (with metal oxides) are conventionally for H 2 S removal. However, they are expensive. Besides, the worldwide production of soda ash bases mostly on the Solvay Process ® (59% in 2000), which generates a large amounts of inorganic solid wastes with the main composition of CaCO 3. This study aims to investigate the use of this calcified solid wastes from the Solvay Process ® for removal of H 2 S in gas phase in order to limit the environmental impacts and enhance the economic benefits. The solid wastes, after some pretreatments, were tested for the removal of H 2 S in a glass fixed-bed reactor at ambient condition. Different parameters such as the influence of the calcination, contact time, iron-doping were investigated. Physico-chemical characterizations by TG-DSC, SEM-EDX were applied. Results showed that these solid wastes are promising for H 2 S treatment. The presence of inorganic impurities played an important role. The pretreatment by calcination and modification by iron-doping strongly improved the reactivity of the initial sorbents. The sorption of H 2 S on calcified sorbent was partially reversible.

National audience