Institution
ExxonMobil
Company•Irving, Texas, United States•
About: ExxonMobil is a company organization based out in Irving, Texas, United States. It is known for research contribution in the topics: Catalysis & Polymerization. The organization has 16969 authors who have published 23758 publications receiving 535713 citations. The organization is also known as: Exxon Mobil Corporation & Exxon Mobil Corp..
Topics: Catalysis, Polymerization, Polymer, Hydrocarbon, Alkyl
Papers published on a yearly basis
Papers
More filters
•
14 Jan 2000TL;DR: A slurry hydroprocessing process for upgrading a hydrocarbon feedstock containing nitrogen and sulfur using bulk multimetallic catalyst comprised of at least one Group VIII non-noble metal and at least two Group VIB metals is described in this paper.
Abstract: A slurry hydroprocessing process for upgrading a hydrocarbon feedstock containing nitrogen and sulfur using bulk multimetallic catalyst comprised of at least one Group VIII non-noble metal and at least two Group VIB metals wherein the ratio of Group VIB metal to Group VIII metal is about 10:1 to about 1:10.
101 citations
•
05 May 1978TL;DR: An improved process for preparing liquid-crystal containing pitches comprises extracting carbonaceous isotropic pitches with an organic solvent system to provide a solvent insoluble fraction which when heated for 10 minutes or less and to temperatures in the range of about 230° C. to 400° C will upon polarized light microscopy examination of cooled samples display greater than 75% of an optically anisotropic phase as discussed by the authors.
Abstract: An improved process for preparing liquid-crystal containing pitches comprises extracting carbonaceous isotropic pitches with an organic solvent system to provide a solvent insoluble fraction which when heated for 10 minutes or less and to temperatures in the range of about 230° C. to 400° C. will upon polarized light microscopy examination of cooled samples display greater than 75% of an optically anisotropic phase.
100 citations
••
TL;DR: A general expression relating the observed XPS intensity ratio of a dispersed phase to the carrier of a catalyst with the size of the dispersed particles has been derived in this article for spherical, hemispherical, and cubic particles.
100 citations
••
TL;DR: In this paper, the sulfur content of sulfated zirconia can be varied by changing the quantity of sulfuric acid used for impregnation in the controlled impregnation method, in which a pre-set quantity of sulfic acid is added and evaporated without filtration or decanting.
Abstract: The sulfur content of sulfated zirconia can be varied by changing the quantity of sulfuric acid used for impregnation in the controlled impregnation method, in which a pre-set quantity of sulfuric acid is added and evaporated without filtration or decanting. The material is then dried and calcined (in this work, for 5 h at 610°C). The sulfur content of the calcined material increases with the increase in the quantity of sulfuric acid, but the ratio of sulfate retained after calcination to sulfate impregnated decreases at first and then increases. The surface area gradually increases with the quantity of the acid up to 3 ml of acid per gram of zirconium hydroxide (2.5% S in SZ after calcination), then decreases abruptly. The crystal structure of the sulfated zirconia is also affected by the sulfur content. XRD data show that the sulfated zirconia with a low or medium sulfur content crystallizes only in the tetragonal form, whereas at higher sulfur content a minor fraction of monoclinic zirconia begins to be seen, in addition to the major tetragonal form. XPS data indicate that at the higher sulfate loading part of the sulfate is present in the bulk phase, rather than on the surface. Thus, the increase in sulfur uptake, decrease in surface area and change in crystallinity appear related to sulfate migration inside the particles. The catalytic activity for the isomerization of methylcyclopentane at 65°C shows a maximum for a sulfur content around 3%. It appears that the optimum catalyst should contain the maximum amount of sulfate near the surface, but not necessarily on the surface, and crystallize in the tetragonal form.
100 citations
••
TL;DR: In this article, the influence of calcination temperature on the solid state chemistry of WO3 on Al2O3 was examined with laser Raman spectroscopy, which revealed the amorphous and crystalline structural transformations occurring in the WO 3 on Al 2O3 oxide system.
100 citations
Authors
Showing all 16987 results
Name | H-index | Papers | Citations |
---|---|---|---|
David A. Weitz | 178 | 1038 | 114182 |
Avelino Corma | 134 | 1049 | 89095 |
Peter Hall | 132 | 1640 | 85019 |
James A. Dumesic | 118 | 615 | 58935 |
Robert H. Crabtree | 113 | 678 | 48634 |
Costas M. Soukoulis | 108 | 644 | 50208 |
Nicholas J. Turro | 104 | 1131 | 53827 |
Edwin L. Thomas | 104 | 606 | 40819 |
Israel E. Wachs | 103 | 427 | 32029 |
Andrew I. Cooper | 99 | 389 | 34700 |
Michael J. Zaworotko | 97 | 519 | 44441 |
Enrique Iglesia | 96 | 416 | 31934 |
Yves J. Chabal | 94 | 519 | 33820 |
George E. Gehrels | 92 | 454 | 30560 |
Ping Sheng | 90 | 593 | 37141 |