Dragomir B. Bukur

Texas A&M University at Qatar

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Branislav Todić

University of Belgrade

Wenping Ma

University of Chinese Academy of Sciences

ŁN

Ł. Nowicki

National Centre for Nuclear Research

Xiaosu Lang

Texas A&M University

Snehal A. Patel

Ganpat University

Burtron H. Davis

Federation of American Societies for Experimental Biology

Gary Jacobs

The University of Texas at San Antonio

Nikola M. Nikačević

University of Belgrade

Michael P. Rosynek

Texas A&M University

James G. Daly

Texas A&M University

Cooperative Institutions

Texas A&M University

Texas A&M University at Qatar

University of Kentucky

Chinese Academy of Sciences

University of Belgrade

University of Novi Sad

University of New Mexico

Centre National de la Recherche Scientifique

Mary Kay (United States)

Aristotle University of Thessaloniki

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Development and process evaluation of improved Fischer-Tropsch slurry catalysts. Quarterly technical progress report, 1 October-31 December 1987

H.P. Withers Dragomir B. Bukur Michael P. Rosynek

The objective of this contract is to develop a consistent technical data base on the use of iron-based catalysts in Fischer-Tropsch (FT) synthesis reactions. This data base will be developed to allow the unambiguous comparison of the performance of these catalysts with each other and with state-of-the-art iron catalyst compositions. Particular attention will be devoted to generating reproducible kinetic and selectivity data and to developing reproducible improved catalyst compositions.

Fischer–Tropsch process

Base (topology)

10.2172/10156553

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Citations (0)

Reaction kinetics over iron catalysts used for the fischer‐tropsch synthesis

The Canadian Journal of Chemical Engineering (1990)

William H. Zimmerman Dragomir B. Bukur

Abstract The kinetics of the Fischer‐Tropsch (FT) and water‐gas shift (WGS) reactions were studied in a stirred tank slurry reactor, using a 100 Fe/0.3 Cu/0.2 K catalyst and a commercial catalyst, Ruhrchemie LP 33/81. The 100 Fe/0.3 Cu/0.2 K catalyst was more active than the Ruhrchemie catalyst for both reactions. FT kinetics which accounted for water inhibition was the best of the rate forms considered for the 100 Fe/0.3 Cu/0.2 K catalyst. First order in H 2 kinetics was sufficient for the Ruhrchemie catalyst, probably due to the low conversions obtained during the test of this catalyst. WGS kinetics, which included product inhibition, were also studied for each catalyst.

Fischer–Tropsch process

Water-gas shift reaction

10.1002/cjce.5450680215

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Citations (155)

NiO supported on Al 2 O 3 and ZrO 2 oxygen carriers for chemical looping steam methane reforming

International Journal of Hydrogen Energy (2015)

Lishil Silvester Andy Antzara Goran Bošković Eleni Heracleous Angeliki A. Lemonidou

Chemical-Looping Combustion

Non-blocking I/O

Partial oxidation

Methane reformer

10.1016/j.ijhydene.2014.12.130

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Citations (100)

Development of improved iron Fischer-Tropsch catalysts. Final technical report: Project 6464

Dragomir B. Bukur S. Ledakowicz M. Koranne

Despite the current worldwide oil glut, the United States will ultimately require large-scale production of liquid (transportation) fuels from coal. Slurry phase Fischer Tropsch (FT) technology, with its versatile product slate, may be expected to play a major role in production of transportation fuels via indirect coal liquefaction. Texas A&M University (TAMU) with sponsorship from the US Department of Energy, Center for Energy and Mineral Resources at TAMU, Texas Higher Education Coordinating Board, and Air Products and Chemicals, Inc., has been working on development of improved iron FT catalysts and characterization of hydrodynamic parameters in two- and three-phase bubble columns with FT derived waxes. Our previous studies have provided an improved understanding of the role of promoters (Cu and K), binders (silica) and pretreatment procedures on catalyst activity, selectivity and longevity (deactivation). The objective of the present contract was to develop improved catalysts with enhanced slurry phase activity and higher selectivity to liquid fuels and wax. This was accomplished through systematic studies of the effects of pretreatment procedures and variations in catalyst composition (promoters and binders). The major accomplishments and results in each of these two main areas of research are summarized here.

Fischer–Tropsch process

Jet fuel

Synthetic fuel

10.2172/10143841

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Citations (2)

Kinetic Modeling of Secondary Methane Formation and 1‐Olefin Hydrogenation in Fischer–Tropsch Synthesis over a Cobalt Catalyst

International Journal of Chemical Kinetics (2017)

Branislav Todić Wenping Ma Gary Jacobs Nikola M. Nikačević Burtron H. Davis

ABSTRACT A detailed kinetic model of Fischer–Tropsch synthesis (FTS) product formation, including secondary methane formation and 1‐olefin hydrogenation, has been developed. Methane formation in FTS over the cobalt‐based catalyst is well known to be higher‐than‐expected compared to other n ‐paraffin products under typical reaction conditions. A novel model proposes secondary methane formation on a different type of active site, which is not active in forming C 2+ products, to explain this anomalous methane behavior. In addition, a model of secondary 1‐olefin hydrogenation has also been developed. Secondary 1‐olefin hydrogenation is related to secondary methane formation with both reactions happening on the same type of active sites. The model parameters were estimated from experimental data obtained with Co/Re/γ‐Al 2 O 3 catalyst in a slurry‐phase stirred tank reactor over a range of conditions ( T = 478, 493, and 503 K, P = 1.5 and 2.5 MPa, H 2 /CO feed ratio = 1.4 and 2.1, and X CO = 16–62%). The proposed model including secondary methane formation and 1‐olefin hydrogenation is shown to provide an improved quantitative and qualitative prediction of experimentally observed behavior compared to the detailed model with only primary reactions.

Fischer–Tropsch process

10.1002/kin.21133

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Citations (12)

Dynamic analysis of millimetre-scale fixed bed reactors for Fischer-Tropsch synthesis

Chemical Engineering Science (2018)

Miloš Mandić Vladimir Dikić Menka Petkovska Branislav Todić Dragomir B. Bukur

Fischer–Tropsch process

Scale-up

10.1016/j.ces.2018.07.052

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Citations (14)

Thermodynamic Analysis of Hydrogen Production via Chemical Looping Steam Methane Reforming Coupled with in Situ CO2 Capture

Energy Procedia (2014)

Andy Antzara Eleni Heracleous Dragomir B. Bukur Angeliki A. Lemonidou

A detailed thermodynamic analysis of the sorption enhanced chemical looping reforming of methane (SE-CL-SMR), using CaO and NiO as CO2 sorbent and oxygen transfer material (OTM) respectively, was conducted. Conventional reforming (SMR) and sorption enhanced reforming (SE-SMR) were also investigated for comparison reasons. The results of the thermodynamic analysis show that there are significant advantages of both sorption enhanced processes compared to conventional reforming. The presence of CaO leads to higher methane conversion and hydrogen purity at low temperatures. Addition of the OTM, in the SE-CL-SMR process concept, minimizes the thermal requirements and results in superior performance compared to SE-SMR and SMR in a two-reactor concept with use of pure oxygen as oxidant/sweep gas.

Methane reformer

Chemical-Looping Combustion

Partial oxidation

10.1016/j.egypro.2014.11.694

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Citations (33)

Hydrodynamics of Fischer-Tropsch Synthesis in Slurry Bubble Column Reactors

G.B. Tatterson Dragomir B. Bukur Snehal A. Patel M. Raphael James G. Daly

Fischer–Tropsch process

Bubble column reactor

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