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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 52 13683 12320 38 36 155 8032

James J. Leahy publications per year

The chart shows the history of publications by James J. Leahy between 1970 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. James J. Leahy published across 57 years, from 1970 to 2026, averaging 3.8 papers a year. Output peaked at 22 publications in 2021. 16 of the 219 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1970 to 2026. Vertical axis: number of publications, 0 to 22. Peak 22 publications in 2021. 1970: 1 publication 1971: 0 publications 1972: 0 publications 1973: 0 publications 1974: 0 publications 1975: 3 publications 1976: 0 publications 1977: 0 publications 1978: 0 publications 1979: 0 publications 1980: 0 publications 1981: 0 publications 1982: 0 publications 1983: 0 publications 1984: 0 publications 1985: 0 publications 1986: 0 publications 1987: 0 publications 1988: 0 publications 1989: 0 publications 1990: 2 publications 1991: 0 publications 1992: 0 publications 1993: 0 publications 1994: 0 publications 1995: 1 publication 1996: 0 publications 1997: 2 publications 1998: 1 publication 1999: 3 publications 2000: 4 publications 2001: 5 publications 2002: 4 publications 2003: 2 publications 2004: 3 publications 2005: 0 publications 2006: 1 publication 2007: 3 publications 2008: 1 publication 2009: 0 publications 2010: 5 publications 2011: 3 publications 2012: 8 publications 2013: 11 publications 2014: 8 publications 2015: 13 publications 2016: 18 publications 2017: 13 publications 2018: 5 publications 2019: 16 publications 2020: 11 publications 2021: 22 publications 2022: 11 publications 2023: 13 publications 2024: 10 publications 2025: 15 publications 2026: 1 publication
1970 2026

219 publications in total across all disciplines

View publications per year as a table
James J. Leahy: publications per year, 1970 to 2026
Year Publications
1970 1
1971 0
1972 0
1973 0
1974 0
1975 3
1976 0
1977 0
1978 0
1979 0
1980 0
1981 0
1982 0
1983 0
1984 0
1985 0
1986 0
1987 0
1988 0
1989 0
1990 2
1991 0
1992 0
1993 0
1994 0
1995 1
1996 0
1997 2
1998 1
1999 3
2000 4
2001 5
2002 4
2003 2
2004 3
2005 0
2006 1
2007 3
2008 1
2009 0
2010 5
2011 3
2012 8
2013 11
2014 8
2015 13
2016 18
2017 13
2018 5
2019 16
2020 11
2021 22
2022 11
2023 13
2024 10
2025 15
2026 1
Total 219
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James J. Leahy publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where James J. Leahy sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 141–160 publications, is where this scientist sits. 61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61–80 publications 1,295+

This scientist: 155 publications — 16th percentile

16% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918
141–160 1,218 155
161–180 1,350
181–200 1,344
201–220 1,281
221–240 1,216
241–260 1,100
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397
421–440 327
441–460 270
461–480 265
481–500 252
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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James J. Leahy D-index placement in Chemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Chemistry scientists ranked by Research.com in 2026. The highlighted bar marks where James J. Leahy sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 52–53 D-Index, is where this scientist sits. 40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40–41 D-Index 159+

This scientist: 52 D-Index — 26th percentile

26% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612
44–45 808
46–47 776
48–49 835
50–51 861
52–53 872 52
54–55 933
56–57 1,051
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561
74–75 501
76–77 437
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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Overview

James J. Leahy is affiliated with the University of Limerick in Ireland. Their research primarily focuses on environmental science and engineering, with significant contributions in the fields of biomedical engineering and industrial and manufacturing engineering. Their work also spans water science and technology, pollution, and environmental chemistry.

The scientist has published extensively on topics including phosphorus and nutrient management, thermochemical biomass conversion processes, adsorption and biosorption for pollutant removal, lignin and wood chemistry, biofuel production and bioconversion, soil and water nutrient dynamics, and wastewater treatment and nitrogen removal.

Frequent collaborators in their research include Witold Kwapiński, Marzena Kwapińska, Italo Pisanó, Nidal Khalaf, and Owen Fenton.

James J. Leahy has published in several recurring venues, reflecting a breadth of involvement across environmental and chemical technology research. Key journals where they have multiple publications include:

  • Fuel
  • Journal of Analytical and Applied Pyrolysis
  • Biomass Conversion and Biorefinery
  • Journal of Environmental Management
  • Journal of Chemical Technology & Biotechnology

Some recent papers authored or co-authored by James J. Leahy are:

  • Hydrothermal carbonization of spent mushroom compost waste compared against torrefaction and pyrolysis (2021) published in Fuel Processing Technology
  • Dairy processing sludge and co-products: A review of present and future re-use pathways in agriculture (2021) published in Journal of Cleaner Production
  • Sewage Sludge Thermal Treatment Technologies with a Focus on Phosphorus Recovery: A Review (2021) published in Waste and Biomass Valorization
  • The effect of particle size, temperature and residence time on the yields and reactivity of olive stones from torrefaction (2020) published in Renewable Energy
  • Hydrothermal carbonization of olive wastes to produce renewable, binder-free pellets for use as metallurgical reducing agents (2020) published in Renewable Energy

Best Publications

  • Kinetic and adsorptive characterization of biochar in metal ions removal

    D. Kołodyńska;R. Wnętrzak;J.J. Leahy;M.H.B. Hayes

  • Biochar from Biomass and Waste

    Witold Kwapinski;Corinna M.P. Byrne;Ekaterina Kryachko;Przemyslaw Wolfram

  • The effect of steam treating waste cooking oil on the yield of methyl ester

    B. Supple;R. Howard-Hildige;Esther Gonzalez-Gomez;J. J. Leahy

  • Regulation of alkane oxidation in Pseudomonas putida.

    A Grund;J Shapiro;M Fennewald;P Bacha

  • A kinetic study of acid catalysed hydrolysis of sugar cane bagasse to levulinic acid

    B. Girisuta;K. Dussan;D. Haverty;J.J. Leahy

  • Adsorption and desorption of phosphate on biochars

    P.A. Trazzi;J.J. Leahy;M.H.B. Hayes;W. Kwapinski

  • Winterisation of waste cooking oil methyl ester to improve cold temperature fuel properties

    M.E González Gómez;R Howard-Hildige;J.J Leahy;B Rice

  • Hydrothermal carbonisation of poultry litter: Effects of treatment temperature and residence time on yields and chemical properties of hydrochars.

    Bashir M. Ghanim;Daya Shankar Pandey;Witold Kwapinski;James J. Leahy

  • Characterization of compost produced from separated pig manure and a variety of bulking agents at low initial C/N ratios.

    Tereza Nolan;Shane M. Troy;Shane M. Troy;Mark G. Healy;Witold Kwapinski

  • Hydro-Pyrolysis of Biomass and Online Catalytic Vapor Upgrading with Ni-ZSM-5 and Ni-MCM-41

    F. Melligan;M. H. B. Hayes;W. Kwapinski;J. J. Leahy

  • Impact of torrefaction on properties of Miscanthus × giganteus relevant to gasification

    Gang Xue;Marzena Kwapinska;Witold Kwapinski;Krzysztof M. Czajka;Krzysztof M. Czajka

  • Kinetics of levulinic acid and furfural production from Miscanthus × giganteus

    K. Dussan;B. Girisuta;D. Haverty;J.J. Leahy

  • Synthesis and characterization of sulfated TiO2 nanorods and ZrO2/TiO2 nanocomposites for the esterification of biobased organic acid.

    Zhonglai Li;Renata Wnetrzak;Witold Kwapinski;James J. Leahy

  • The influence of metal selection on catalyst activity for the liquid phase hydrogenation of furfural to furfuryl alcohol

    Á. O’Driscoll;J.J. Leahy;T. Curtin

  • Hydrothermal carbonization of spent mushroom compost waste compared against torrefaction and pyrolysis

    Emile Atallah;Emile Atallah;Joseph Zeaiter;Mohammad N. Ahmad;James J. Leahy

  • The role of long lived free radicals in the ageing of irradiated ultra high molecular weight polyethylene

    P. O’Neill;C. Birkinshaw;J.J. Leahy;R. Barklie

  • Chemically and biologically-mediated fertilizing value of manure-derived biochar

    Raghunath Subedi;Raghunath Subedi;N. Taupe;I. Ikoyi;Chiara Bertora

  • Hydrothermal carbonisation of poultry litter: effects of initial pH on yields and chemical properties of hydrochars.

    Bashir M. Ghanim;Witold Kwapinski;James J. Leahy

  • Pressurised pyrolysis of Miscanthus using a fixed bed reactor.

    F. Melligan;R. Auccaise;E.H. Novotny;J.J. Leahy

  • Non-stoichiometric formation of formic and levulinic acids from the hydrolysis of biomass derived hexose carbohydrates

    T. Flannelly;M. Lopes;L. Kupiainen;S. Dooley

  • Emission and Performance Characteristics of a 2 Litre Toyota Diesel Van Operating on Esterified Waste Cooking Oil and Mineral Diesel Fuel

    M. E. Gonzalez Gomez;R. Howard-Hildige;J. J. Leahy;T. O’Reilly

  • Reaction Pathway Analysis of Ethyl Levulinate and 5-Ethoxymethylfurfural from d-Fructose Acid Hydrolysis in Ethanol

    Thomas Flannelly;Stephen Dooley;J. J. Leahy

  • Conversion of hemicellulose sugars catalyzed by formic acid: kinetics of the dehydration of D-xylose, L-arabinose, and D-glucose

    Karla Dussan;Buana Girisuta;Marystela Lopes;James J. Leahy

Frequent Co-Authors

Mohammad N.M. Ahmad
Mohammad N.M. Ahmad American University of Beirut
Mark G. Healy
Mark G. Healy University of Galway
Kevin McDonnell
Kevin McDonnell University College Dublin
Owen Fenton
Owen Fenton Teagasc - The Irish Agriculture and Food Development Authority
Maurice N. Collins
Maurice N. Collins University of Limerick
Peadar G. Lawlor
Peadar G. Lawlor Teagasc - The Irish Agriculture and Food Development Authority
Savvas A. Tassou
Savvas A. Tassou Brunel University London
Alberto Gómez-Barea
Alberto Gómez-Barea University of Seville
Gavin Walker
Gavin Walker University of Limerick
Lars Stoumann Jensen
Lars Stoumann Jensen University of Copenhagen

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