Author: Shizhong (Jason) Zhao
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages :

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Author: Duane Benjamin Myers
Publisher:
ISBN:
Category :
Languages : en
Pages : 84

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Author: Asghar Zeini-Isfahani
Publisher:
ISBN:
Category :
Languages : en
Pages : 247

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The object of this thesis was to gain a greater understanding of the mechanism of the catalytic steam reforming of methane and higher hydrocarbons and of related reactions (methanation and water-gas shift)......

Author: Elizabeth L. Norris
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Yan Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 209

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This work aims to develop a fundamental understanding of the catalyst composition-structure-activity relationships for propane steam reforming over supported Rh catalysts. The work investigates the influence of ceria and nickel additions to alumina-supported Rh catalysts for propane steam reforming at low temperatures using different loading levels for ceria and Ni. An optimum loading is found in terms of reforming activity. In this work, 2 wt% Rh and 5 wt% Ni supported on 20 wt% ceria modified alumina exhibits the highest activity. TPR characterization shows ceria and nickel loading can change both the metal-metal and metal-support interactions. Generally, adding ceria makes rhodium oxide easier to reduce, and the presence of rhodium makes ceria easier to reduce, whereas the addition of nickel makes rhodium oxide more difficult to reduce. FE-SEM and XPS results indicate that ceria is highly dispersed on alumina surfaces with ceria loading of less than 20 wt%. Adjusting ceria and nickel loading can change the nanostructures of catalytically active phases, thus influencing the propane reforming rate of Rh catalysts at low temperatures. A kinetic study at different temperatures (450 - 650 °C) indicates that adding ceria and nickel can greatly increase the propane reforming rates by lowering the activation energies. A kinetic equation based on the Langmuir-Hinshelwood model was applied to Rh-based catalysts. Results at different partial pressures of propane and steam reveal the addition of ceria can enhance steam and propane adsorption, while the addition of Ni can promote propane adsorption, probably through working with Rh as propane adsorption sites. The kinetic study shows the importance of a balance between steam and propane adsorption. Possible active phases on the catalysts are also discussed.

Author: Abdulrhman Saleh al-Ubaid
Publisher:
ISBN:
Category :
Languages : en
Pages : 530

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Author: P. L. Silveston
Publisher: Butterworth-Heinemann
ISBN: 0123918669
Category : Science
Languages : en
Pages : 793

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Book Description
This comprehensive review, prepared by 24 experts, many of whom are pioneers of the subject, brings together in one place over 40 years of research in this unique publication. This book will assist R & D specialists, research chemists, chemical engineers or process managers harnessing periodic operations to improve their process plant performance. Periodic Operation of Reactors covers process fundamentals, research equipment and methods and provides "the state of the art" for the periodic operation of many industrially important catalytic reactions. Emphasis is on experimental results, modeling and simulation. Combined reaction and separation are dealt with, including simulated moving bed chromatographic, pressure and temperature swing and circulating bed reactors. Thus, Periodic Operation of Reactors offers readers a single comprehensive source for the broad and diverse new subject. This exciting new publication is a "must have" for any professional working in chemical process research and development. - A comprehensive reference on the fundamentals, development and applications of periodic operation - Contributors and editors include the pioneers of the subject as well as the leading researchers in the field - Covers both fundamentals and the state of the art for each operation scenario, and brings all types of periodic operation together in a single volume - Discussion is focused on experimental results rather than theoretical ones; provides a rich source of experimental data, plus process models - Accompanying website with modelling data

Author: Michael Charles Frederick Steel
Publisher:
ISBN:
Category :
Languages : en
Pages :

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STEAM REFORMING, NICKEL-ALUMINA, CATALYSTS, METHANATION, OXIDATION, CHEMICAL INTERACTIONS, CRYSTAL STRUCTURE, METHANE, KINETICS, COPRECIPITATION.

Author: Angelo Basile
Publisher: Elsevier
ISBN: 1782422277
Category : Technology & Engineering
Languages : en
Pages : 697

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Book Description
Membrane Reactors for Energy Applications and Basic Chemical Production presents a discussion of the increasing interest in membrane reactors that has emerged in recent years from both the scientific and industrial communities, in particular their usage for energy applications and basic chemical production. Part One of the text investigates membrane reactors for syngas and hydrogen production, while Part Two examines membrane reactors for other energy applications, including biodiesel and bioethanol production. The final section of the book reviews the use of membrane reactors in basic chemical production, including discussions of the use of MRs in ammonia production and the dehydrogenation of alkanes to alkenes. - Provides comprehensive coverage of membrane reactors as presented by a world-renowned team of experts - Includes discussions of the use of membrane reactors in ammonia production and the dehydrogenation of alkanes to alkenes - Tackles the use of membrane reactors in syngas, hydrogen, and basic chemical production - Keen focus placed on the industry, particularly in the use of membrane reactor technologies in energy

Author: Huo-Yen Hsieh
Publisher:
ISBN:
Category : Ethanes
Languages : en
Pages : 392

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