Download or read book Hydrodesulfurization and Hydrodenitrogenation of Model Compounds Using In situ Hydrogen Over Nano Dispersed Mo Sulfide Based Catalysts written by Kun Liu and published by . This book was released on 2010 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heavy oil derived from oil sands is becoming an important resource of energy and transportation fuels due to the depletion of conventional oil resources. However, bitumen and heavy oils have a low hydrogen/carbon ratio and contain a large percentage of sulfur and nitrogen heterocyclic compounds. At the level of deep desulfurization, aromatic poly-nuclear molecules, especially nitrogen-containing heterocyclic compounds, exhibit strong inhibitive effect on hydrodesulfurization (HDS) due to competitive adsorption on catalytically active sites with sulfur-containing molecules. Therefore, it is necessary to study the HDS of refractory sulfur-containing compounds and also the effect of nitrogen-containing species on the deep HDS for achieving the ultra low sulfur specifications for transportation fuels. Additionally, the cost of H2 increased in recent years and a bitumen emulsion upgrading technique using an alternative in-situ H2 generated via the water gas shift (WGS) reaction during the hydro-treating was developed in our group.

Download or read book Hydrodesulfurization and Hydrodenitrogenation written by Toshiaki Kabe and published by Wiley-VCH. This book was released on 2000-04-13 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of efficient catalysts for hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) processes is an essential and urgent research field. During oil refinement the removal of sulfur and nitrogen compounds from petroleum feedstock is crucial, as the emission of sulfur and nitrogen oxides into the atmosphere causes severe environmental problems. In light of the industrial process for hydrocarbons, HDS is indispensable as it eliminates the poisoning of catalysts during hydrotreatment and hydrocracking. In order to develop new catalysts, the mechanism of these reactions as well as the structures and functions of the catalysts need to be elucidated. This book provides an up-to-date and deep insight, which spans kinetic studies, catalytic cycles, structures and properties of catalysts to process engineering. Therefore every chemist and engineer working in this important research field will welcome this valuable source of information.

Download or read book Hydrodesulfurization of Gas Oil Catalyzed by in Situ Molybdenum Compounds written by Boonchai Seentrakoon and published by . This book was released on 2006 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: In situ decomposition of ammonium and tetrabutylammonium thiomolybdate (ATM and TBATM) were used to synthesize unsupported MoS[subscript 2] catalysts, the in situ activation consisted of decomposing the thiomolybdate precursors in the presence of hydrocarbon solvent under H[subscript 2] pressure at 350degrees Celsius during the hydrodesulfurization (HDS) of dibenzothiophene (DBT) or 4,6-dimethydibenzothiophene (4,6-DMDBT) as sulfur model compounds. In situ generated MOS[subscript 2] catalysts were characterized by XRD, BET, EDX and SEM. Parameters affecting the HDS reaction were investigated: hydrogen pressure, reaction time, amount of precursor, types of precursor, cobalt and nickel promoters, and water addition. Inhibition of pyridine was also examined. The results showed that, cobalt and nickel addition enhanced HDS activity of both in situ generated MoS[subscript 2] catalysts from ATM and TBATM precursors. The use of ATM precursor with added water for in situ generation of MoS[subscript 2] catalyst can lead to 100% conversion of HDS of 4,6-DMDBT under 30 atm H[subscript 2] pressure at 350degrees celsius. Model reaction suggested that water addition led to a high surface area, highly active MoS[subscript 2] catalyst. The optimal mole ratio of H[subscript 2]O/ATM = 1200 performed the highest surface area (559 m[superscript 2]/g). In addition, the catalysts could reduce the sulfur contents of straight run gas oil (SRGO) from 6100 ppm to 3250 ppm and from 310 ppm to 100 ppm in light cycle oil (LCO).

Download or read book The Nature of Supported Co Mo and Ni W and Hydrodenitrogenation and Hydrodesulfurization of Model Compounds written by Eric J. Dadey and published by . This book was released on 1984 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalysis for Clean Energy and Environmental Sustainability written by K. K. Pant and published by Springer Nature. This book was released on 2021-04-01 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is part of a two-volume work that offers a unique blend of information on realistic evaluations of catalyst-based synthesis processes using green chemistry principles and the environmental sustainability applications of such processes for biomass conversion, refining, and petrochemical production. The volumes provide a comprehensive resource of state-of-the-art technologies and green chemistry methodologies from researchers, academics, and chemical and manufacturing industrial scientists. The work will be of interest to professors, researchers, and practitioners in clean energy catalysis, green chemistry, chemical engineering and manufacturing, and environmental sustainability. This volume focuses on catalyst synthesis and green chemistry applications for petrochemical and refining processes. While most books on the subject focus on catalyst use for conventional crude, fuel-oriented refineries, this book emphasizes recent transitions to petrochemical refineries with the goal of evaluating how green chemistry applications can produce clean energy through petrochemical industrial means. The majority of the chapters are contributed by industrial researchers and technicians and address various petrochemical processes, including hydrotreating, hydrocracking, flue gas treatment and isomerization catalysts.

Download or read book A Study of the Hydrodesulfurization and Hydrodenitrogenation Capabilities of a Commercial Ni Mo Al2O3 Catalyst on Natural and Synthetic Kerosenes written by Brian P. Cook and published by . This book was released on 2007 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Novel Magnetically Recyclable MoS2 Catalysts for Hydrodesulfurization and Hydrodeoxygenation written by Seyyedmajid Sharifvaghefi and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Problems associated with hydrotreating of heavy and extra-heavy crude oils in conventional fixed-bed reactors have led to the design of more innovative reactors such as slurry reactors. Dispersed fine catalysts are commonly used in slurry reactors. However, separation of the fine particles with sizes in micrometers or nanometers from the liquid phase represents a challenge. In this work, novel magnetically recyclable catalysts are designed to address this issue. Two different magnetic core materials, Fe3O4 and Fe3S4, were studied. Core-and-shell composite catalysts MoS2/Fe3O4 and MoS2/Fe3S4 were designed. Both catalysts showed high activity in the hydrodesulfurization (HDS) of dibenzothiophene (DBT). Former one showed high affinity towards the direct desulfurization (DDS) pathway while the later one presented a balanced selectivity between DDS and hydrogenation (HYD) pathways. This provides the refineries an option to adjust the hydrotreating process based on their needs using each of the catalysts or a combination of both. Catalyst MoS2/Fe3S4 was further promoted by nickel and cobalt. The activity of the catalysts could be ranked as NiMoS/Fe3S4 > CoMoS/Fe3S4 > MoS2/Fe3S4. Addition of Ni to MoS2 catalyst forms the Ni-Mo-S phase with increased accessible sulfur edge which is responsible for the enhancement in both hydrogenation and desulfurization. The catalyst MoS2 with greigite core and its promoted catalyst NiMoS/CoMoS were also applied to the hydrodeoxygenation (HDO) of stearic acid. HDO was the dominant pathway for all of the catalysts. Catalysts MoS2/Fe3O4 and MoS2/Fe3S4 were used to investigate the roles of H2 and H2S and the involved active sites in the HDS of DBT. Two different active sites for hydrogenation (HYD) and hydrodesulfurization (HDS) were identified. The MoS2 with magnetite core demonstrated high selectivity towards the DDS pathway, which was attributable to the differences in adsorption energy of hydrogen and DBT over hydrogenation and desulfurization sites. H2S is favored being adsorbed on the S-edge vacancies to transfer the active sites to HYD/Isomerization sites. Hydrogen plays three distinctive roles: 1) When adsorbed at Mo edge, hydrogen promotes hydrogenation; 2) Strongly bonded at S-edge it accounts for direct desulfurization; 3) while loosely bonded to S-edge it favors HYD and isomerization."--Pages ii-iii.

Download or read book Probing the Hydrodesulfurization Properties of Nickel rich Bimetallic Phosphides written by Samuel J. Danforth and published by . This book was released on 2015 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling Hydrodesulfurization Catalysis HDS by Solid State Synthesis Homogeneous Desulfurization and Heterogeneous Probe Reactions written by Keenan Edward Dungey and published by . This book was released on 1998 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Frontiers in Nanochemistry Concepts Theories and Trends written by Mihai V. Putz and published by CRC Press. This book was released on 2020-05-06 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: New Frontiers in Nanochemistry: Concepts, Theories, and Trends, Volume 2: Topological Nanochemistry is the second of the new three-volume set that explains and explores the important basic and advanced modern concepts in multidisciplinary chemistry. Under the broad expertise of the editor, this second volume explores the rich research areas of nanochemistry with a specific focus on the design and control of nanotechnology by structural and reactive topology. The objective of this particular volume is to emphasize the application of nanochemistry. With 46 entries from eminent international scientists and scholars, the content in this volume spans concepts from A-to-Z—from entries on the atom-bond connectivity index to the Zagreb indices, from connectivity to vapor phase epitaxy, and from fullerenes to topological reactivity—and much more. The definitions within the text are accompanied by brief but comprehensive explicative essays as well as figures, tables, etc., providing a holistic understanding of the concepts presented.

Download or read book The Effect of an Acidic Catalyst on Simultaneous Hydrodenitrogenation and Hydrodesulfurization of Model Compounds written by and published by . This book was released on 1981 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nanotechnology in Oil and Gas Industries written by Tawfik Abdo Saleh and published by Springer. This book was released on 2017-10-06 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a powerful source to develop new, rapid and highly efficient materials for the application in various fields of oil and gas. It focuses on the synthesis, characterization and applications of various Nanomaterials, presenting the state-of-the-art in developments and innovations in nanocomposites. This book provides the complete practical and theoretical information about the synthesis of nanoparticles with potential use in the field of oil and gas.

Download or read book Catalytic Hydroprocessing of Petroleum and Distillates written by Michael Oballa and published by CRC Press. This book was released on 1994-06-10 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work is based on the proceedings of the American Institute of Chemical Engineers' Spring National Meeting in Houston, Texas, March 28 to April 1, 1993. It details various facets of residue upgrading and distillate hydrotreating, stressing the importance of selective catalysts in aromatics reduction. New aromatics saturation processes for the production of very low-aromatic distillates are introduced.

Download or read book Understanding Hydrodenitrogenation on Unsupported and Supported Sulfide Based Catalysts written by Ana Hrabar and published by . This book was released on 2011 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Processing of Heavy Crude Oils written by Ramasamy Marappa Gounder and published by . This book was released on 2019-12-18 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Unsupported Transition Metal Sulfide Catalysts for Deep Hydrodesulfurization of Hydrocarbon Fuels written by and published by . This book was released on 2007 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The requirement of clean fuels has resulted in a continuing worldwide effort to dramatically reduce the sulfur levels. This is driving the need for more active hydrodesulfurization (HDS) catalysts. The purpose of this research is to study the potential of unsupported Mo based sulfide catalysts prepared from hydrothermal method. The unsupported catalysts exhibited the excellent activity for the simultaneous HDS of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). Activity and surface area of catalysts depend strongly upon the preparation temperature and pressure. Organic solvent added in catalyst preparation helps to improve the dispersion of the precursor molecules. The unpromoted and promoted (Co or Ni) Mo sulfide catalysts have different properties and activity. Addition of promoter decreased surface area and pore volume. TPR analysis suggested that promoter decrease metal sulfur bond strength. HRTEM and XRD results showed that the growth of catalyst particle was suppressed when promoter was added. The promoter increased HDS activity of MoS[subscript 2] and changed the contribution of the direct-desulfurization and of hydrogenation pathways. The main effect of the promoter was to increase the rate of C-S bond cleavage. The liquid-phase adsorption of DBT and 4,6-DMDBT was used to study the adsorption capacity and mechanism over the synthesized catalysts. The results showed that the promoters not only increase active site number, but also enhance activity of active sites of the Mo sulfide.

Download or read book Metal Cluster Hydrodesulfurization Catalysts Based on Ternary Molybdenum Sulfides written by Robert Kirk Thompson and published by . This book was released on 1999 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Temperature-programmed analysis studies were performed in conjunction with XPS to examine how the oxidation states change as a function of pretreatment temperature. The mechanism through which these new reduced ternary molybdenum sulfides convert to the crystalline Chevrel phase was also determined. The low temperature synthesis route of these new reduced molybdenum sulfides has allowed the synthesis of new cluster compounds, such as Pt(Mo6S)S. X-ray photoelectron spectroscopy, laser Raman spectroscopy, infrared spectroscopy and microprobe analysis indicate that this new material is structurally similar to other cluster compounds we have synthesized. Pretreatment of PtMoS in hydrogen at 950°C results in its conversion to the previously unknown crystalline Chevrel phase.