Mobil

About: Mobil is a based out in . It is known for research contribution in the topics: Catalysis & Zeolite. The organization has 7085 authors who have published 10642 publications receiving 237497 citations. The organization is also known as: Socony-Vacuum Oil Company & Standard Oil Company of New York.

Synthesis and structure of synthetic zeolite ZSM-11

Abstract: ZSM-5 (refs 1, 2) is a member of a new class of shape selective catalysts which have unique channel structures with 10-membered ring openings. These catalysts have unusual properties. They can selectively convert methanol to high quality gasoline3–6 and are used in commercially significant processes, such as distillate dewaxing, ethylbenzene synthesis, xylene isomerisation and toluene disproportionation5,7 The framework of ZSM-5 (ref. 2) contains a novel configuration of linked tetrahedra consisting of eight five-membered rings. These configurational units may be linked through edges to form chains and the chains to form a three-dimensional framework which describes an intersecting channel system with openings intermediate between those in zeolite Linde type A and faujasite. We report here the synthesis and structure of another member of this family, ZSM-11.

Construction of the seawater 87Sr86Sr curve for the cenozoic and cretaceous: Supporting data

Abstract: We present the data used to construct the Cenozoic and Cretaceous portion of the Phanerozoic curve of seawater 87 Sr 86 Sr that had been given in summary form by W.H. Burke coworkers. All Cenozoic samples (128) and 22 Cretaceous samples are foram-nannofossil oozes and limestones from DSDP cores distributed among 13 sites in the Atlantic, Pacific and Indian Oceans, and the Caribbean Sea. Non-DSDP Cretaceous samples (126) include limestone, anhydrite and phosphate samples from North America, Europe and Asia. Determination of the 87 Sr 86 Sr value of seawater at particular times in the past is based on comparison of ratios derived from coeval marine samples from widely separated geographic areas. These samples are characterized by a wide variety of diagenetic and burial histories. The large size and cosmopolitan nature of the data set decreases the likelihood that, among coeval data, systematic error has been introduced by a similar pattern of diagenetic alteration of the ratios. There is good clustering of data points throughout the Cenozoic and Cretaceous curve. The consistency of data is illustrated by Cenozoic and Cretaceous data plots that include a separate symbol for each DSDP site and non-DSDP sample location. More than 98% of the data points are enclosed by upper and lower lines that define a narrow band. For any given time, the correct seawater ratio probably lies within this band. A line drawn within the band represents our estimate of the actual seawater ratio as a function of time. The general configuration of the Cenozoic and Cretaceous curve appears to be strongly influenced by the history of plate interactions and sea-floor spreading. Specific rises and falls in the 87 Sr 86 Sr of seawater, however, may be caused by a variety of factors such as variation in lithologic composition of the crust exposed to weathering, configuration and topographic relief of continents, volcanic activity, rate of sea-floor spreading, extent of continental inundation by epeiric seas, and variations in both climate and paleooceanographic conditions. Many or all of these factors are probably related to global tectonic processes, yet their combined effect on the temporal variation of seawater 87 Sr 86 Sr can complicate a direct platetectonic interpretation for portions of the seawater curve.

Productivity of a horizontal well

Abstract: Presentation d'une equation permettant de calculer le regime d'ecoulement semi-permanent d'un puits horizontal. L'utilisation judicieuse de cette relation theorique exige de connaitre deux parametres: un facteur geometrique et un facteur d'effet de peau. Le facteur geometrique represente les effets de l'anisotropie de permeabilite, de la localisation du puits et des dimensions relatives du volume draine. L'effet de peau est cause par un etranglement a l'entree, et tient compte de l'extension du puits. Les equations proposees sont illustrees par une analyse theorique et un exemple d'application