World's Best Scientists 2026 revealed!

D-Index & Metrics

Chemistry

D-Index
46
Citations
6817
World Ranking
16153
National Ranking
4023

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
Paul C. Hackley
Paul C. Hackley United States Geological Survey
Hans G. Machel
Hans G. Machel University of Alberta
Kenneth E. Peters
Kenneth E. Peters Stanford University
Maria Mastalerz
Maria Mastalerz Indiana University
David M. Grant
David M. Grant University of Nottingham

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