M.M.A. Freitas

4.7k total citations · 1 hit paper
21 papers, 4.2k citations indexed

About

M.M.A. Freitas is a scholar working on Materials Chemistry, Organic Chemistry and Mechanical Engineering. According to data from OpenAlex, M.M.A. Freitas has authored 21 papers receiving a total of 4.2k indexed citations (citations by other indexed papers that have themselves been cited), including 14 papers in Materials Chemistry, 5 papers in Organic Chemistry and 5 papers in Mechanical Engineering. Recurrent topics in M.M.A. Freitas's work include Catalytic Processes in Materials Science (9 papers), Mesoporous Materials and Catalysis (5 papers) and Nanomaterials for catalytic reactions (4 papers). M.M.A. Freitas is often cited by papers focused on Catalytic Processes in Materials Science (9 papers), Mesoporous Materials and Catalysis (5 papers) and Nanomaterials for catalytic reactions (4 papers). M.M.A. Freitas collaborates with scholars based in Portugal, Spain and Colombia. M.M.A. Freitas's co-authors include José L. Figueiredo, M. Fernando R. Pereira, J.J.M. Órfão, A. Erhan Aksoylu, Baltazar de Castro, Ana Rosa Silva, Cristina Freire, Joaquim L. Faria, Marco A. Fraga and Elizabete Jordão and has published in prestigious journals such as SHILAP Revista de lepidopterología, Langmuir and Applied Catalysis B: Environmental.

In The Last Decade

M.M.A. Freitas

21 papers receiving 4.1k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Modification of the surface chemistry of activated carbons

1999 2.7k citations José L. Figueiredo, M. Fernando R. Pereira et al. Carbon profile →

Peers

M.M.A. Freitas

EEE

EOMM

Agustín F. Pérez‐Cadenas Spain

S. Biniak Poland

Shiding Miao China

Andrzej Świątkowski Poland

C. Salinas-Martı́nez de Lecea Spain

Barbara Bonelli Italy

Jacek Gurgul Poland

Eun Woo Shin South Korea

Akshaya K. Samal India

Fabián Suárez‐García Spain

Agustín F. Pérez‐Cadenas Spain

M.M.A. Freitas

1.7k ×0.7

954 ×1.1

935 ×1.1

EEE

1.1k ×1.4

EOMM

709 ×0.9

Citations per year, relative to M.M.A. Freitas M.M.A. Freitas (= 1×) peers Agustín F. Pérez‐Cadenas

Countries citing papers authored by M.M.A. Freitas

Since Specialization

Citations

This map shows the geographic impact of M.M.A. Freitas's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by M.M.A. Freitas with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites M.M.A. Freitas more than expected).

Fields of papers citing papers by M.M.A. Freitas

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by M.M.A. Freitas. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by M.M.A. Freitas. The network helps show where M.M.A. Freitas may publish in the future.

Co-authorship network of co-authors of M.M.A. Freitas

This figure shows the co-authorship network connecting the top 25 collaborators of M.M.A. Freitas. A scholar is included among the top collaborators of M.M.A. Freitas based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with M.M.A. Freitas. M.M.A. Freitas is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Freitas, M.M.A., et al.. (2022). Ciprofloxacin and carbamazepine adsorption on activated carbons produced from leather residues. Desalination and Water Treatment. 260. 235–240. 1 indexed citations

Freitas, M.M.A., et al.. (2017). Pyrolysis of Cork Granules: Influence of Operating Variables on Char Yield. 9(1). 16–22. 2 indexed citations

Velásquez, José de Jesús Díaz, et al.. (2011). Estudio por Drifts de la oxidación en óxido nitroso de un carbón activado. SHILAP Revista de lepidopterología. 1 indexed citations

Bastos, Samuel, J.J.M. Órfão, M.M.A. Freitas, M. Fernando R. Pereira, & José L. Figueiredo. (2009). Manganese oxide catalysts synthesized by exotemplating for the total oxidation of ethanol. Applied Catalysis B: Environmental. 93(1-2). 30–37. 107 indexed citations

Méndez, Ana, M.M.A. Freitas, S. Villar–Rodil, et al.. (2007). A comparison of different carbon filaments on the nanometer and atomic scales by scanning tunneling microscopy. Materials Letters. 61(26). 4787–4790. 1 indexed citations

Méndez, Ana, M.M.A. Freitas, & José L. Figueiredo. (2006). Synthesis of carbon filaments and nanotubes on a graphitic substrate: optimization studies. Carbon. 44(11). 2350–2353. 2 indexed citations

Figueiredo, José L., M. Fernando R. Pereira, M.M.A. Freitas, & J.J.M. Órfão. (2006). Characterization of Active Sites on Carbon Catalysts. Industrial & Engineering Chemistry Research. 46(12). 4110–4115. 312 indexed citations

Méndez, Ana, Gabriel Gascó, M.M.A. Freitas, et al.. (2005). Preparation of carbon-based adsorbents from pyrolysis and air activation of sewage sludges. Chemical Engineering Journal. 108(1-2). 169–177. 98 indexed citations

Samant, Purnakala V., Filomena Gonçalves, M.M.A. Freitas, M. Fernando R. Pereira, & José L. Figueiredo. (2004). Surface activation of a polymer based carbon. Carbon. 42(7). 1321–1325. 77 indexed citations

10.

Silva, Ana Rosa, et al.. (2004). Anchoring of Copper(II) Acetylacetonate onto an Activated Carbon Functionalised with a Triamine. European Journal of Inorganic Chemistry. 2004(10). 2027–2035. 47 indexed citations

11.

Silva, Ana Rosa, Marta Martins, M.M.A. Freitas, et al.. (2002). Immobilisation of amine-functionalised nickel(II) Schiff base complexes onto activated carbon treated with thionyl chloride. Microporous and Mesoporous Materials. 55(3). 275–284. 71 indexed citations

12.

Fraga, Marco A., Elizabete Jordão, Mário J. G. C. Mendes, et al.. (2002). Properties of Carbon-Supported Platinum Catalysts: Role of Carbon Surface Sites. Journal of Catalysis. 209(2). 355–364. 200 indexed citations

13.

Silva, Ana Rosa, M.M.A. Freitas, Cristina Freire, Baltazar de Castro, & José L. Figueiredo. (2002). Heterogenization of a Functionalized Copper(II) Schiff Base Complex by Direct Immobilization onto an Oxidized Activated Carbon. Langmuir. 18(21). 8017–8024. 69 indexed citations

14.

Silva, Ana Rosa, Cristina Freire, Baltazar de Castro, M.M.A. Freitas, & José L. Figueiredo. (2001). Anchoring of a nickel(II) Schiff base complex onto activated carbon mediated by cyanuric chloride. Microporous and Mesoporous Materials. 46(2-3). 211–221. 63 indexed citations

15.

Aksoylu, A. Erhan, et al.. (2001). The effects of different activated carbon supports and support modifications on the properties of Pt/AC catalysts. Carbon. 39(2). 175–185. 235 indexed citations

16.

Freitas, M.M.A. & José L. Figueiredo. (2001). Preparation of carbon molecular sieves for gas separations by modification of the pore sizes of activated carbons. Fuel. 80(1). 1–6. 61 indexed citations

17.

Aksoylu, A. Erhan, M.M.A. Freitas, & José L. Figueiredo. (2000). Bimetallic Pt–Sn catalysts supported on activated carbon. Applied Catalysis A General. 192(1). 29–42. 103 indexed citations

18.

Aksoylu, A. Erhan, M.M.A. Freitas, & José L. Figueiredo. (2000). Bimetallic Pt–Sn catalysts supported on activated carbon. II. CO oxidation. Catalysis Today. 62(4). 337–346. 45 indexed citations

19.

Hegedűs, László, et al.. (2000). Effect of carbon support properties on enantioselective hydrogenation of isophorone over palladium catalysts modified with (−)-dihydroapovincaminic acid ethyl ester. Journal of Molecular Catalysis A Chemical. 153(1-2). 215–219. 27 indexed citations

20.

Figueiredo, José L., M. Fernando R. Pereira, M.M.A. Freitas, & J.J.M. Órfão. (1999). Modification of the surface chemistry of activated carbons. Carbon. 37(9). 1379–1389. 2681 indexed citations breakdown →

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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