World's Best Scientists 2026 revealed!

D-Index & Metrics

Chemistry

D-Index
46
Citations
6817
World Ranking
16151
National Ranking
4022

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.

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 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.

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.

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 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.

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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