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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 46 16151 14575 4022 3299 106 6817

Simon R. Kelemen publications per year

The chart shows the history of publications by Simon R. Kelemen between 1975 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Simon R. Kelemen published across 51 years, from 1975 to 2025, averaging 2.5 papers a year. Output peaked at 12 publications in 2002. 2 of the 128 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1975 to 2025. Vertical axis: number of publications, 0 to 12. Peak 12 publications in 2002. 1975: 1 publication 1976: 1 publication 1977: 4 publications 1978: 3 publications 1979: 5 publications 1980: 3 publications 1981: 8 publications 1982: 5 publications 1983: 1 publication 1984: 2 publications 1985: 4 publications 1986: 2 publications 1987: 1 publication 1988: 1 publication 1989: 2 publications 1990: 5 publications 1991: 6 publications 1992: 2 publications 1993: 2 publications 1994: 1 publication 1995: 3 publications 1996: 0 publications 1997: 5 publications 1998: 3 publications 1999: 2 publications 2000: 0 publications 2001: 3 publications 2002: 12 publications 2003: 1 publication 2004: 3 publications 2005: 1 publication 2006: 9 publications 2007: 5 publications 2008: 4 publications 2009: 4 publications 2010: 2 publications 2011: 3 publications 2012: 1 publication 2013: 1 publication 2014: 2 publications 2015: 1 publication 2016: 0 publications 2017: 1 publication 2018: 0 publications 2019: 0 publications 2020: 0 publications 2021: 0 publications 2022: 0 publications 2023: 1 publication 2024: 1 publication 2025: 1 publication
1975 2025

128 publications in total across all disciplines

View publications per year as a table
Simon R. Kelemen: publications per year, 1975 to 2025
Year Publications
1975 1
1976 1
1977 4
1978 3
1979 5
1980 3
1981 8
1982 5
1983 1
1984 2
1985 4
1986 2
1987 1
1988 1
1989 2
1990 5
1991 6
1992 2
1993 2
1994 1
1995 3
1996 0
1997 5
1998 3
1999 2
2000 0
2001 3
2002 12
2003 1
2004 3
2005 1
2006 9
2007 5
2008 4
2009 4
2010 2
2011 3
2012 1
2013 1
2014 2
2015 1
2016 0
2017 1
2018 0
2019 0
2020 0
2021 0
2022 0
2023 1
2024 1
2025 1
Total 128
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Simon R. Kelemen 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 Simon R. Kelemen 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, 101–120 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: 106 publications — 3rd percentile

3% 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
101–120 623 106
121–140 918
141–160 1,218
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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Simon R. Kelemen 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 Simon R. Kelemen 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, 46–47 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: 46 D-Index — 12th percentile

12% 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 46
48–49 835
50–51 861
52–53 872
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

What is he best known for?

The fields of study he is best known for:

  • Organic chemistry
  • Oxygen
  • Hydrogen

The scientist’s investigation covers issues in X-ray photoelectron spectroscopy, Sulfur, Carbon, Inorganic chemistry and Analytical chemistry. His study looks at the relationship between X-ray photoelectron spectroscopy and fields such as Nitrogen, as well as how they intersect with chemical problems. His Sulfur study often links to related topics such as Adsorption.

The Carbon study combines topics in areas such as Carbon-13 NMR and Coal. He combines subjects such as Thiophene, XANES and Resolution with his study of Coal. His Inorganic chemistry study combines topics in areas such as Reactivity, Pyrolysis, Hydrocarbon and Dissociation.

His most cited work include:

  • Direct characterization of kerogen by x-ray and solid-state **13c nuclear magnetic resonance methods (242 citations)
  • Quantification of nitrogen forms in Argonne Premium coals (222 citations)
  • Direct determination and quantification of sulphur forms in heavy petroleum and coals: 1. The X-ray photoelectron spectroscopy (XPS) approach (222 citations)

What are the main themes of his work throughout his whole career to date?

The scientist’s investigation covers issues in Inorganic chemistry, Sulfur, X-ray photoelectron spectroscopy, Analytical chemistry and Carbon. His work deals with themes such as Catalysis, Adsorption, Chemisorption, Reactivity and Oxygen, which intersect with Inorganic chemistry. His work in Sulfur addresses subjects such as Thiophene, which are connected to disciplines such as X-ray absorption spectroscopy.

His X-ray photoelectron spectroscopy study combines topics in areas such as Pyrolysis, XANES, Nuclear chemistry and Nitrogen. In the field of Analytical chemistry, his study on K-edge and Elemental analysis overlaps with subjects such as Absorption. His Carbon research also works with subjects such as

  • Environmental chemistry, Mineralogy and Resolution most often made with reference to Coal,
  • Carbon-13 NMR together with Chemical structure.

He most often published in these fields:

  • Inorganic chemistry (32.29%)
  • Sulfur (27.08%)
  • X-ray photoelectron spectroscopy (21.87%)

What were the highlights of his more recent work (between 2007-2017)?

  • Hydrocarbon (17.71%)
  • Sulfur (27.08%)
  • Inorganic chemistry (32.29%)

In recent papers he was focusing on the following fields of study:

Simon R. Kelemen mainly focuses on Hydrocarbon, Sulfur, Inorganic chemistry, Petroleum and Pyrolysis. His Hydrocarbon research entails a greater understanding of Organic chemistry. His Sulfur research is multidisciplinary, incorporating elements of Chemical composition, X-ray absorption spectroscopy, Absorption spectroscopy, Fossil fuel and Sulfate.

The study incorporates disciplines such as Oxidizing agent, Carbon and Nitrogen in addition to Sulfate. The concepts of his Petroleum study are interwoven with issues in Distillation, Fluid catalytic cracking, Asphaltene and Petroleum engineering. His Pyrolysis research is multidisciplinary, incorporating perspectives in Environmental chemistry, Organic matter and Coal.

Between 2007 and 2017, his most popular works were:

  • Geochemical signatures of thermochemical sulfate reduction in controlled hydrous pyrolysis experiments (71 citations)
  • Characterization of solid bitumens originating from thermal chemical alteration and thermochemical sulfate reduction (71 citations)
  • Distinguishing solid bitumens formed by thermochemical sulfate reduction and thermal chemical alteration (42 citations)

In his most recent research, the most cited papers focused on:

  • Organic chemistry
  • Oxygen
  • Hydrogen

Sulfate, Hydrocarbon, Inorganic chemistry, Sulfur and Nitrogen are his primary areas of study. Organic chemistry covers Simon R. Kelemen research in Sulfate. His work on Oxidizing agent, Methane, Oxygen and Pyrolysis as part of general Organic chemistry research is frequently linked to Hydrous pyrolysis, bridging the gap between disciplines.

His Nitrogen study incorporates themes from Heteroatom, Precipitation, Aromaticity, Carbon-13 NMR and Carbon. He has included themes like Redox and Chemical composition in his Carbon study.

Best Publications

  • Direct characterization of kerogen by x-ray and solid-state **13c nuclear magnetic resonance methods

    S. R. Kelemen;M. Afeworki;M. L. Gorbaty;M. Sansone

  • Quantification of nitrogen forms in Argonne Premium coals

    S. R. Kelemen;M. L. Gorbaty;P. J. Kwiatek

  • Direct determination and quantification of sulphur forms in heavy petroleum and coals: 1. The X-ray photoelectron spectroscopy (XPS) approach

    S.R. Kelemen;G.N. George;M.L. Gorbaty

  • Maturity trends in Raman spectra from kerogen and coal

    S. R. Kelemen;H. L. Fang

  • XPS and 15N NMR study of nitrogen forms in carbonaceous solids

    S. R. Kelemen;M. Afeworki;and M. L. Gorbaty;P. J. Kwiatek

  • Direct determination and quantification of sulfur forms in coals from the Argonne Premium Sample Program

    Graham N. George;Martin L. Gorbaty;Simon R. Kelemen;Michael Sansone

  • Characterization of Organically Bound Oxygen Forms in Lignites, Peats, and Pyrolyzed Peats by X-ray Photoelectron Spectroscopy (XPS) and Solid-State 13C NMR Methods

    S. R. Kelemen;and M. Afeworki;M. L. Gorbaty;A. D. Cohen

  • Effect of hydrocarbon type on thermochemical sulfate reduction

    Tongwei Zhang;Geoffrey S. Ellis;Kang shi Wang;Clifford C. Walters

  • Asphaltene Molecular Structure and Chemical Influences on the Morphology of Coke Produced in Delayed Coking

    M. Siskin;S. R. Kelemen;C. P. Eppig;L. D. Brown

  • Model experiments on the poisoning of Pt catalysts by sulfur

    T.E. Fischer;S.R. Kelemen

  • Nitrogen Transformations in Coal during Pyrolysis

    S. R. Kelemen;M. L. Gorbaty;P. J. Kwiatek;T. H. Fletcher

  • Characterization of solid bitumens originating from thermal chemical alteration and thermochemical sulfate reduction

    Simon R. Kelemen;Clifford C. Walters;Peter J. Kwiatek;Howard Freund

  • Direct determination and quantification of sulphur forms in heavy petroleum and coals: 2. The sulphur K edge X-ray absorption spectroscopy approach

    Martin L. Gorbaty;Graham N. George;Simon R. Kelemen

  • Petroleum Expulsion Part 1. Theory of Kerogen Swelling in Multicomponent Solvents

    Deniz Ertas;Simon R. Kelemen;Thomas C. Halsey

  • Thermal Chemistry of Nitrogen in Kerogen and Low-Rank Coal

    S. R. Kelemen;H. Freund;M. L. Gorbaty;P. J. Kwiatek

  • Thermal transformations of nitrogen and sulfur forms in peat related to coalification

    S. R. Kelemen;M. Afeworki;M. L. Gorbaty;P. J. Kwiatek

  • Carbon aromaticity based on XPS II to II∗ signal intensity

    S.R. Kelemen;K.D. Rose;P.J. Kwiatek

  • Petroleum expulsion. Part 3. A model of chemically driven fractionation during expulsion of petroleum from kerogen

    S. R. Kelemen;C. C. Walters;D. Ertas;H. Freund

  • Geochemical signatures of thermochemical sulfate reduction in controlled hydrous pyrolysis experiments

    Tongwei Zhang;Geoffrey S. Ellis;Clifford C. Walters;Simon R. Kelemen

  • The water dissociation reaction on clean and oxidized iron (110)

    D. J. Dwyer;S. R. Kelemen;A. Kaldor

  • Adsorption of acetylene and benzene on the Pt(100) surface

    T.E. Fischer;S.R. Kelemen;H.P. Bonzel

  • The binding energy of CO on clean and sulfur covered platinum surfaces

    S.R. Kelemen;T.E. Fischer;J.A. Schwarz

Frequent Co-Authors

Clifford C. Walters
Clifford C. Walters ExxonMobil (United States)
Graham N. George
Graham N. George University of Saskatchewan
Ronald J. Pugmire
Ronald J. Pugmire University of Utah
Israel E. Wachs
Israel E. Wachs Lehigh University
Yongchun Tang
Yongchun Tang California Institute of Technology
Tongwei Zhang
Tongwei Zhang The University of Texas at Austin
Hans G. Machel
Hans G. Machel University of Alberta
Paul C. Hackley
Paul C. Hackley United States Geological Survey
Kenneth E. Peters
Kenneth E. Peters Stanford University
David M. Grant
David M. Grant University of Nottingham

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