Type of Document	Dissertation
Author	Clark, Paul Alexander
URN	etd-11192000-22380039
Title	New Catalysts for Hydroprocessing: Molybdenum and Tungsten Phosphide
Degree	PhD
Department	Chemical Engineering
Advisory Committee	Advisor Name Title S. Ted Oyama Committee Chair David F. Cox Committee Member Kimberly Forsten Committee Member Stephen L. Kampe Committee Member Uri Vandsburger Committee Member
Keywords	phosphide tungsten molybdenum hydrodenitrogenation
Date of Defense	2000-09-29
Availability	unrestricted
Abstract This dissertation describes the preparation and application of a novel class of hydroprocessing catalysts, transition metal phosphides. Concentration was placed on molybdenum and tungsten monophosphides because of the importance of these elements in standard sulfidic hydrotreating catalysts. Transition metal phosphides exist over a wide range of stoichiometry, and their properties have a great deal of variation, ranging from phosphorus poor compounds with metallic electrical properties to phosphorus rich compounds with semiconducting or insulating properties. The x-ray diffraction patterns of the phosphides studied here were unchanged under the conditions of catalytic hydroprocessing, demonstrating their stability toward the hydroprocessing conditions and allowing study of their intrinsic catalytic properties. Materials were prepared in bulk form, supported on alumina, and supported on silica. The mechanism of hydrodenitrogenation on MoP/SiO2 and WP/SiO2 catalysts was investigated by comparison of hydrodenitrogenation reactions of pyridine, piperidine, n-pentylamine, tert-pentylamine, and neo-pentylamine.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    Chapter1.PDF 104.89 Kb 00:00:29 00:00:14 00:00:13 00:00:06 < 00:00:01   Chapter2.PDF 224.63 Kb 00:01:02 00:00:32 00:00:28 00:00:14 00:00:01   Chapter3.PDF 539.75 Kb 00:02:29 00:01:17 00:01:07 00:00:33 00:00:02   Chapter4.PDF 80.02 Kb 00:00:22 00:00:11 00:00:10 00:00:05 < 00:00:01   Chapter5.PDF 309.42 Kb 00:01:25 00:00:44 00:00:38 00:00:19 00:00:01   Chapter6.PDF 91.26 Kb 00:00:25 00:00:13 00:00:11 00:00:05 < 00:00:01   Chapter7.PDF 10.01 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01   Contents.PDF 69.80 Kb 00:00:19 00:00:09 00:00:08 00:00:04 < 00:00:01   Vita1.PDF 1.86 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01

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