Showing papers by "Mexican Institute of Petroleum published in 1980"
TL;DR: Sill intrusions into highly porous sediments in the Guaymas Basin, Gulf of California, lead to low-grade metamorphism, thermal alteration and migration of organic compounds, marked changes in interstitial water chemistry, and large-scale expulsion of heated pore fluids as mentioned in this paper.
Abstract: Sill intrusions into highly porous sediments in the Guaymas Basin, Gulf of California, lead to low-grade metamorphism, thermal alteration and migration of organic compounds, marked changes in interstitial water chemistry, and large-scale expulsion of heated pore fluids. The latter process creates space for the intruding magma and initiates a hydrothermal system, which can explain the observed hydrothermal deposits around fault scarps on the basin floor.
272 citations
TL;DR: It is shown that important problems arising in process synthesis can be tackled effectively using mixed-integer linear programming techniques.
80 citations
TL;DR: A section from a 152-meter hole into the sediments of the oxygen minimum zone at a depth of 655 meters along the Guaymas slope in the central Gulf of California records variations in climate, productivity, and circulation for more than 250,000 years of Late Pleistocene to Holocene history.
Abstract: During Deep Sea Drilling Project-International Program of Ocean Drilling leg 64, December 1978 to January 1979, the initial test of the Deep Sea Drilling Project's hydraulic piston corer obtained an almost undisturbed section from a 152-meter hole into the sediments of the oxygen minimum zone at a depth of 655 meters along the Guaymas slope in the central Gulf of California. The section records variations in climate, productivity, and circulation for more than 250,000 years of Late Pleistocene to Holocene history with recordings of seasonal variations in these parameters in the laminated sections.
59 citations
TL;DR: In this article, two types of hexagonal-shaped Pt particles were found, one having a (111) face parallel to the (0001) face of the graphite surface, and the other with a (110) face in contact with the (100) face.
51 citations
TL;DR: In this article, an analytical method for calculating absorption functions and EPR lineshapes from polycrystalline samples is given, expressed in closed form through an integral over only the angle φ.
31 citations
01 Jan 1980
25 citations
TL;DR: The crystallographic structure of small platinum particles was studied and correlated with their catalytic activity in this article, where the platinum particles were found to be fcc cubo-octahedra with either a (111) or a (110) face in contact with the basal graphite plane.
22 citations
17 citations
Patent•
11 Sep 1980TL;DR: In this paper, an improved multi-subular reactor for oxichlorination of ethylene is described, with the catalyst being a fluidizable solid of Cu salts and oxides, the improvement characterized in that the process is carried out in a multitubular reactor which comprises a gas distributing diffusor including a cap ferrule and granulated nickel.
Abstract: The present invention refers to an improved reactor for oxichlorination of ethylene and to the process used therefor, which in a general way proceeds in accordance with the following reaction: ##STR1## the catalyst being a fluidizable solid of Cu salts and oxides, the improvement being characterized in that the process is carried out in a multitubular reactor which comprises a gas distributing diffusor including a cap ferrule and granulated nickel.
11 citations
01 Jan 1980
10 citations
TL;DR: In this article, the analysis of nonadditive effects in small palladium clusters via LCAO-MO-SCF calculations using the nonempirical pseudopotential model is presented.
Abstract: The analysis of nonadditive effects in small palladium clusters via LCAO-MO-SCF calculations using the nonempirical pseudopotential model is presented. The results are tentatively correlated with previous studies on various metal clusters (Li, Be, Mg, etc.) for which a good knowledge of multibody terms has provided a valuable guide for understanding the cluster stabilities and their chemisorption capacity.
TL;DR: In this article, a simple transition probability formula is applied to the core hole ionization in CO, satisfactorily predicting the ratio between the intensity of the two inner-shell peaks, and the theoretical results agree reasonably well with the experiment.
Abstract: A simple transition probability formula is applied to the core hole ionization in CO, satisfactorily predicting the ratio between the intensity of the two inner-shell peaks. The formula is also applied to the full ESCA spectra of water and methane; the theoretical results agree reasonably well with the experiment.
TL;DR: In this paper, a theoretical study of the carbon monoxide insertion reaction in methylmanganese-pentacarbonyl utilizing an all-valence-electron self-consistent field molecular orbital method in the CNDO approximation is presented.
TL;DR: In this article, the state of alloying on bimetallic metal clusters is studied based on high resolution weak beam images which are also defocussed Pt-Ir catalyst supported on γ-Al2O3.
TL;DR: The surface vibrations of graphite are less pronounced than those in more isotropic crystals as discussed by the authors, and the surface-excess specific heat of the bare surface peaks at 45 K, that of the xenon at 13.5 K.
TL;DR: In this article, the problem of mapping a Morse potential in one dimension into a two-dimensional harmonic oscillator was solved by using two different chains of groups, SU(1,1) and U(2) respectively.
Abstract: We map the problem of a Morse potential in one dimension into a two-dimensional harmonic oscillator. The symmetry group for this problem is U(2). Starting from the dynamical group Sp(4), we use two different chains of groups including SU(1,1) and U(2) respectively.
01 Jan 1980
TL;DR: In this article, weak beam electron microscopy was used to characterize particles of Pt supported on graphite by using weak beam microscopy and correlates the particle shape with the kinetics data for the conversion of neopentane.
Abstract: Publisher Summary This chapter characterizes particles of Pt supported on graphite by using weak beam electron microscopy and correlates the particle shape with the kinetics data for the conversion of neopentane. This reaction is of the “demanding” type as the activity is influenced by the particle size and more general by the mode of catalyst preparation. This system appears to be very convenient for the correlation sought because the reaction has the metal as sole site of catalytic activity. The preparation of Pt/C catalyst is made by using materials of high purity. The support is a graphite LONZA - LT10, type ex-anthracite, with 99.9% of carbon, as reported by the supplier. The activity data of the neopentane conversion over a Pt/C catalyst is collected in a differential reactor flow system coupled with a Varian Aerograph 1200 chromatograph. When observed in bright field microscopy, the Pt clusters show two main profiles, hexagonal and elongated hexagonal. The data plot represents a very encouraging correlation between the particle shape and crystallography with selectivity for isomerization data, which proves that the electron microscopy is indeed a very powerful technique to obtain such data.