Mircea Gabriel Macavei

@upb.ro

National University of Science and Technology Politehnica of Bucharest

Mircea Gabriel Macavei


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https://researchid.co/mircea.macavei
Researcher in thermochemical conversion and waste valorization, with expertise in conventional and microwave-assisted pyrolysis, gasification, reaction kinetics, catalyst and susceptor development, and process modeling. Current work focuses on the conversion of polymeric and animal-derived wastes through integrated experimental and modeling approaches, with emphasis on process optimization, mass–energy assessment, and the development of sustainable waste-to-resource pathways.

RESEARCH, TEACHING, or OTHER INTERESTS

Renewable Energy, Sustainability and the Environment, Environmental Engineering, Waste Management and Disposal
7

Scopus Publications

63

Scholar Citations

4

Scholar h-index

3

Scholar i10-index

Scopus Publications

  • Bio-based compounds from synergistic processing of bone waste via advanced ultrasound assisted-enzymatic pretreatment and fast pyrolysis
    Gabriela Ionescu, Mircea Gabriel Macavei, Mariana Pătrașcu, Agata Mlonka-Mędrala, Gabriela Petcu, et al.
    Bioresource Technology, 2026
  • Bio-based material as microwave susceptor and catalyst support for plastic waste microwave-assisted pyrolysis
    Mircea Gabriel Macavei, Mariana Pătrașcu, Gabriela Ionescu, Virginia-Cora Gheorghe, Gabriela Petcu, et al.
    Clean Technologies and Environmental Policy, 2025
    Worldwide, the waste generated by the food industry sector is expected to increase due to demographic extension and consumer-driven society effect. One type of this waste is represented by animal bone. This study explores the valorization of biochar obtained from chicken bone waste (CBW) pyrolysis at 500–700 °C. The biochar obtained at 700 °C showed better characteristics, such as higher porosity, specific surface area and dielectric proprieties. Further on, the biochar was activated through microwave (MW) treatment to improve its structure and morphology. The activated biochar was investigated as microwave susceptor material and catalyst support for microwave-assisted pyrolysis of low-density polyethylene (LDPE) packaging waste. Compared to common microwave susceptors, the activated biochar proved good microwave absorption capabilities, reaching temperatures of 450 °C. Additionally, the biochar was used as catalyst support, doped with silicon, titanium, and zinc oxides with applications in plastic pyrolysis. As catalyst in microwave-assisted pyrolysis (MAP) of LDPE, it enhanced the gas yield of the process, obtaining a pyro-gas composition rich in hydrogen (43%). These findings prove the dual functionality of the CBW-derived biochar, providing a new sustainable solution for converting chicken bone and plastic waste into value-added products. Graphical abstract
  • Heat and flow dynamics in biomass reactors under pyrolysis conditions: Computational insights
    Mihai Rares Sandu, Dorin Boldor, Mircea Gabriel Macavei, Aneta Magdziarz, Cosmin Marculescu
    Renewable Energy, 2025
  • KINETIC INVESTIGATION OF LOW-DENSITY POLYETHYLENE PYROLYSIS: EFFECTS OF HEATING RATE
    UPB Scientific Bulletin Series C Electrical Engineering and Computer Science, 2025
  • ENERGY RECOVERY FROM BONE WASTE GASIFICATION
    Energy Environment Efficiency Resources Globalization, 2025
  • New integrated processing of chicken bone waste using an enzymatic pretreatment and slow pyrolysis to produce green chemicals
    Gabriela Ionescu, Mircea Macavei, Mariana Pătrascu, Adrian Volceanov, Roxana Pătrascu, et al.
    Energy Conversion and Management, 2025
  • Thermochemical Conversion of Animal-Derived Waste: A Mini-Review with a Focus on Chicken Bone Waste
    Mircea Gabriel Macavei, Virginia-Cora Gheorghe, Gabriela Ionescu, Adrian Volceanov, Roxana Pătrașcu, et al.
    Processes, 2024
    Food waste, particularly animal-derived waste, presents a significant challenge globally, prompting the need for sustainable management strategies. In 2022, the amount of food waste per capita reached 131 kg/capita in the EU (European Union), which is why the search for environmentally friendly ways to manage food waste through thermochemical conversion processes has gained momentum in recent years. Animal-derived waste is a good source of organic matter (proteins, lipids, and polysaccharides) and mineral compounds (calcium phosphate, mostly hydroxyapatite). This composition makes animal-derived waste valuable for the extraction of chemical compounds, such as hydroxyapatite (HAp), which constitutes up to 70 wt% of animal bones; keratin; collagen; and hyaluronic acid (HA), to produce pharmaceutical, medical, or industrial by-products. The thermochemical conversion of chicken bones through pyrolysis and gasification creates a new opportunity to valorize this type of waste by reintroducing valuable by-products into the economy and thus achieving sustainable waste management objectives. The results of this study showcase the multiple applications of the pyrolysis of chicken bone waste products (as adsorbents in aqueous mediums, catalysts, fertilizers, and biomedical applications) and the necessity of a better exploration of the gasification process of chicken bone waste. Therefore, this study explores the properties of animal-derived waste and discusses the pyrolysis and gasification of chicken bone waste, the influence of process conditions on product yields, and the catalytic enhancement of these thermochemical processes.

RECENT SCHOLAR PUBLICATIONS

  • Bio-based compounds from synergistic processing of bone waste via advanced ultrasound assisted-enzymatic pretreatment and fast pyrolysis
    G Ionescu, MG Macavei, M Pătraşcu, A Mlonka-Mędrala, G Petcu, ...
    Bioresource Technology, 134860 , 2026
    2026
  • Energy recovery from bone waste gasification
    MG Macavei, R Pătrașcu, G Ionescu, C Mărculescu
    EMERG: Energy. Environment. Efficiency. Resources. Globalization 11 (4) , 2025
    2025
  • Kinetic investigation of low-density polyethylene pyrolysis: effects of heating rate
    MG Macavei, G Ionescu, C Mărculescu
    UPB Scientific Bulletin, Series C: Electrical Engineering 87 (3), 509-523 , 2025
    2025
  • Bio-based material as microwave susceptor and catalyst support for plastic waste microwave-assisted pyrolysis
    MG Macavei, M Pătrașcu, G Ionescu, VC Gheorghe, G Petcu, ...
    Clean Technologies and Environmental Policy, 1-15 , 2025
    2025
    Citations: 13
  • Heat and flow dynamics in biomass reactors under pyrolysis conditions: Computational insights
    MR Sandu, D Boldor, MG Macavei, A Magdziarz, C Marculescu
    Renewable Energy 244, 122691 , 2025
    2025
    Citations: 7
  • Energy recovery and economic viability of animal-derived waste air gasification for syngas production
    MG Macavei, R Pătrașcu, C Mărculescu
    International Conference of Management and Industrial Engineering 12, 538-545 , 2025
    2025
  • New integrated processing of chicken bone waste using an enzymatic pretreatment and slow pyrolysis to produce green chemicals
    G Ionescu, M Macavei, M Pătrascu, A Volceanov, R Pătrascu, S Werle, ...
    Energy Conversion and Management 323, 119281 , 2025
    2025
    Citations: 18
  • Thermochemical conversion of animal-derived waste: A mini-review with a focus on chicken bone waste
    MG Macavei, VC Gheorghe, G Ionescu, A Volceanov, R Pătrașcu, ...
    Processes 12 (2), 358 , 2024
    2024
    Citations: 25

MOST CITED SCHOLAR PUBLICATIONS

  • Thermochemical conversion of animal-derived waste: A mini-review with a focus on chicken bone waste
    MG Macavei, VC Gheorghe, G Ionescu, A Volceanov, R Pătrașcu, ...
    Processes 12 (2), 358 , 2024
    2024
    Citations: 25
  • New integrated processing of chicken bone waste using an enzymatic pretreatment and slow pyrolysis to produce green chemicals
    G Ionescu, M Macavei, M Pătrascu, A Volceanov, R Pătrascu, S Werle, ...
    Energy Conversion and Management 323, 119281 , 2025
    2025
    Citations: 18
  • Bio-based material as microwave susceptor and catalyst support for plastic waste microwave-assisted pyrolysis
    MG Macavei, M Pătrașcu, G Ionescu, VC Gheorghe, G Petcu, ...
    Clean Technologies and Environmental Policy, 1-15 , 2025
    2025
    Citations: 13
  • Heat and flow dynamics in biomass reactors under pyrolysis conditions: Computational insights
    MR Sandu, D Boldor, MG Macavei, A Magdziarz, C Marculescu
    Renewable Energy 244, 122691 , 2025
    2025
    Citations: 7
  • Bio-based compounds from synergistic processing of bone waste via advanced ultrasound assisted-enzymatic pretreatment and fast pyrolysis
    G Ionescu, MG Macavei, M Pătraşcu, A Mlonka-Mędrala, G Petcu, ...
    Bioresource Technology, 134860 , 2026
    2026
  • Energy recovery from bone waste gasification
    MG Macavei, R Pătrașcu, G Ionescu, C Mărculescu
    EMERG: Energy. Environment. Efficiency. Resources. Globalization 11 (4) , 2025
    2025
  • Kinetic investigation of low-density polyethylene pyrolysis: effects of heating rate
    MG Macavei, G Ionescu, C Mărculescu
    UPB Scientific Bulletin, Series C: Electrical Engineering 87 (3), 509-523 , 2025
    2025
  • Energy recovery and economic viability of animal-derived waste air gasification for syngas production
    MG Macavei, R Pătrașcu, C Mărculescu
    International Conference of Management and Industrial Engineering 12, 538-545 , 2025
    2025