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D-Index & Metrics

Discipline name D-Index World Ranking National Ranking Publications Citations
Chemistry 74 4773 1500 350 17542

Philip L. Walker publications per year

The chart shows the history of publications by Philip L. Walker between 1952 and 2021, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Philip L. Walker published across 70 years, from 1952 to 2021, averaging 5.5 papers a year. Output peaked at 21 publications in 1972. 1 of the 388 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1952 to 2021. Vertical axis: number of publications, 0 to 21. Peak 21 publications in 1972. 1952: 2 publications 1953: 4 publications 1954: 2 publications 1955: 7 publications 1956: 3 publications 1957: 2 publications 1958: 0 publications 1959: 4 publications 1960: 4 publications 1961: 5 publications 1962: 3 publications 1963: 12 publications 1964: 8 publications 1965: 10 publications 1966: 7 publications 1967: 8 publications 1968: 13 publications 1969: 15 publications 1970: 15 publications 1971: 8 publications 1972: 21 publications 1973: 17 publications 1974: 1 publication 1975: 15 publications 1976: 21 publications 1977: 18 publications 1978: 18 publications 1979: 13 publications 1980: 17 publications 1981: 11 publications 1982: 17 publications 1983: 10 publications 1984: 12 publications 1985: 8 publications 1986: 10 publications 1987: 3 publications 1988: 4 publications 1989: 3 publications 1990: 4 publications 1991: 5 publications 1992: 2 publications 1993: 6 publications 1994: 2 publications 1995: 2 publications 1996: 3 publications 1997: 2 publications 1998: 1 publication 1999: 0 publications 2000: 0 publications 2001: 0 publications 2002: 0 publications 2003: 0 publications 2004: 0 publications 2005: 0 publications 2006: 0 publications 2007: 2 publications 2008: 2 publications 2009: 0 publications 2010: 0 publications 2011: 0 publications 2012: 0 publications 2013: 0 publications 2014: 0 publications 2015: 0 publications 2016: 5 publications 2017: 0 publications 2018: 0 publications 2019: 0 publications 2020: 0 publications 2021: 1 publication
1952 2021

388 publications in total across all disciplines

View publications per year as a table
Philip L. Walker: publications per year, 1952 to 2021
Year Publications
1952 2
1953 4
1954 2
1955 7
1956 3
1957 2
1958 0
1959 4
1960 4
1961 5
1962 3
1963 12
1964 8
1965 10
1966 7
1967 8
1968 13
1969 15
1970 15
1971 8
1972 21
1973 17
1974 1
1975 15
1976 21
1977 18
1978 18
1979 13
1980 17
1981 11
1982 17
1983 10
1984 12
1985 8
1986 10
1987 3
1988 4
1989 3
1990 4
1991 5
1992 2
1993 6
1994 2
1995 2
1996 3
1997 2
1998 1
1999 0
2000 0
2001 0
2002 0
2003 0
2004 0
2005 0
2006 0
2007 2
2008 2
2009 0
2010 0
2011 0
2012 0
2013 0
2014 0
2015 0
2016 5
2017 0
2018 0
2019 0
2020 0
2021 1
Total 388
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Philip L. Walker 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 Philip L. Walker 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, 341–360 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: 350 publications — 73rd percentile

73% 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
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
341–360 628 350
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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Philip L. Walker 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 Philip L. Walker 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, 74–75 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: 74 D-Index — 75th percentile

75% 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
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 74
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
  • Catalysis

Philip L. Walker focuses on Carbon, Coal, Inorganic chemistry, Analytical chemistry and Char. His work deals with themes such as Graphite, Carbon monoxide, Oxygen and Chemisorption, which intersect with Carbon. His Coal research integrates issues from Porosity, Microporous material, Mineralogy and Infrared spectroscopy.

His Inorganic chemistry research is multidisciplinary, relying on both Hydrolysis, Catalysis and Adsorption. His Analytical chemistry research incorporates themes from Chemical kinetics and Decomposition. Philip L. Walker interconnects Reactivity and Magnesium in the investigation of issues within Char.

His most cited work include:

  • Nature of the porosity in American coals (539 citations)
  • THE IMPORTANCE OF ACTIVE SURFACE AREA IN THE CARBON-OXYGEN REACTION1,2 (522 citations)
  • Gas Reactions of Carbon (473 citations)

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

His main research concerns Carbon, Inorganic chemistry, Coal, Analytical chemistry and Adsorption. His studies deal with areas such as Graphite, Molecular sieve, Carbon dioxide and Oxygen as well as Carbon. His study looks at the relationship between Inorganic chemistry and topics such as Catalysis, which overlap with Dispersion.

His research in Coal tackles topics such as Mineralogy which are related to areas like Porosity. The study incorporates disciplines such as Microporous material, Torr and Nitrogen in addition to Adsorption. His Char study combines topics in areas such as Reactivity, Charring and Coal gasification.

He most often published in these fields:

  • Carbon (41.64%)
  • Inorganic chemistry (33.75%)
  • Coal (20.50%)

What were the highlights of his more recent work (between 1981-2016)?

  • Carbon (41.64%)
  • Inorganic chemistry (33.75%)
  • Catalysis (14.20%)

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

His primary areas of study are Carbon, Inorganic chemistry, Catalysis, Coal and Char. His Carbon research includes themes of Molecular sieve, Adsorption, Graphite, Mineralogy and Oxygen. His Mineralogy study combines topics from a wide range of disciplines, such as Differential scanning calorimetry, Carbon dioxide and Analytical chemistry.

His Inorganic chemistry study integrates concerns from other disciplines, such as Ion exchange, Reactivity, Pyrolysis and Chemisorption. His Catalysis study combines topics from a wide range of disciplines, such as Dispersion, Hydrogen and Nickel. The various areas that Philip L. Walker examines in his Coal study include Environmental chemistry, Carbonization and Swelling.

Between 1981 and 2016, his most popular works were:

  • Importance of carbon active sites in the gasification of coal chars (389 citations)
  • Importance of catalyst dispersion in the gasification of lignite chars (167 citations)
  • An update on the carbon-oxygen reaction (141 citations)

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

  • Organic chemistry
  • Oxygen
  • Catalysis

Carbon, Inorganic chemistry, Catalysis, Coal and Pyrolysis are his primary areas of study. He has researched Carbon in several fields, including Chemisorption, Molecular sieve, Adsorption, Reaction rate constant and Oxygen. His Inorganic chemistry research is multidisciplinary, incorporating perspectives in Fourier transform infrared spectroscopy and Pellet.

His research in Catalysis intersects with topics in Dispersion and Hydrogen. His biological study spans a wide range of topics, including Carbonization, Intensity, Mineralogy and Analytical chemistry. His work on Char as part of general Pyrolysis study is frequently connected to Carbon black, therefore bridging the gap between diverse disciplines of science and establishing a new relationship between them.

Best Publications

  • Nature of the porosity in American coals

    H. Gan;S.P. Nandi;P.L. Walker

  • THE IMPORTANCE OF ACTIVE SURFACE AREA IN THE CARBON-OXYGEN REACTION1,2

    N. R. Laine;F. J. Vastola;P. L. Walker

  • Gas Reactions of Carbon

    P.L. Walker;Frank Rusinko;L.G. Austin

  • Importance of carbon active sites in the gasification of coal chars

    Ljubiša R. Radović;Philip L. Walker;Robert G. Jenkins

  • Laser raman studies on carbons

    M. Nakamizo;R. Kammereck;P.L. Walker

  • Reactivity of heat-treated coals in air at 500 °C

    Robert G. Jenkins;Satyendra P. Nandi;Philip L. Walker

  • Measurement of interlayer spacings and crystal sizes in turbostratic carbons

    M.A Short;P.L Walker

  • Importance of catalyst dispersion in the gasification of lignite chars

    Ljubisa R. Radovic;Philip L. Walker;Robert G. Jenkins

  • Reactivity of heat-treated coals in carbon dioxide at 900 °C

    Edwin Hippo;Philip L. Walker

  • An update on the carbon-oxygen reaction

    P.L. Walker;R.L. Taylor;J.M. Ranish

  • CO hydrogenation over well-dispersed carbon-supported iron catalysts

    H-J. Jung;P.L. Walker;Albert Vannice

  • Carbon Formation from Carbon Monoxide-Hydrogen Mixtures over Iron Catalysts.I. Properties of Carbon Formed

    P. L. Walker;J. F. Rakszawski;G. R. Imperial

  • Catalysis of gasification of coal-derived cokes and chars

    Philip L. Walker;Shiro Matsumoto;Tamotsu Hanzawa;Takatoshi Muira

  • Fourier Transform Infrared study of mineral matter in coal. A novel method for quantitative mineralogical analysis

    Paul C. Painter;Michael M. Coleman;Robert G. Jenkins;Pyung W. Whang

  • Carbon as a support for catalysts: I. Effect of surface heterogeneity of carbon on dispersion of platinum

    P. Ehrburger;O.P. Mahajan;P.L. Walker

  • Carbon: An old but new material revisited

    P.L. Walker

  • 6Å molecular sieve properties of saran-type carbons

    T.G. Lamond;J.E. Metcalfe;P.L. Walker

  • Enhancement of lignite char reactivity to steam by cation addition

    Edwin J. Hippo;Robert G. Jenkins;Philip L. Walker

  • Activated diffusion of methane in coal

    S.P. Nandi;P.L. Walker

  • Thermal desorption analysis of oxygen surface complexes on carbon

    G Tremblay;F.J Vastola;P.L Walker

  • Chemistry and Physics of Carbon A Series of Advances

    P. L. Walker;P. A. Thrower;Ljubisa R. Radovic

Frequent Co-Authors

Ljubisa R. Radovic
Ljubisa R. Radovic Pennsylvania State University
Angel Linares-Solano
Angel Linares-Solano University of Alicante
Paul C. Painter
Paul C. Painter Pennsylvania State University
Michael M. Coleman
Michael M. Coleman Pennsylvania State University
Francisco Rodríguez-Reinoso
Francisco Rodríguez-Reinoso University of Alicante
José Rivera-Utrilla
José Rivera-Utrilla University of Granada
Carlos Moreno-Castilla
Carlos Moreno-Castilla University of Granada
John Meurig Thomas
John Meurig Thomas University of Cambridge

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