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Title: Isotopic tracer studies of Fischer-Tropsch Synthesis over Ru/TiO 2 catalysts

Abstract

Fischer-Tropsch synthesis is a process in which CO and H 2 react to give predominantly liquid hydrocarbons. The reaction can be considered a special type of polymerization in which the monomer is produced in situ, and chain growth occurs by a sequence of independently repeated additions of the monomer to the growing chain. A investigation has been conducted to study the CO hydrogenation reaction in order to better understand catalyst deactivation and the elementary surface processes involved in chain growth. Isotopic tracers are used in conjunction with transient-response techniques in this study of Fischer-Tropsch synthesis over Ru/TiO 2 catalysts. Experiments are conducted at a total pressure of 1 atmosphere, reaction temperatures of 453--498 K and D 2/CO (or H 2/CO) ratios of 2--5. Synthesis products are analyzed by gas chromatography or isotope-ratio gas chromatography-mass spectrometry. Rate constants for chain initiation, propagation and termination are evaluated under steady-state reaction conditions by using transients in isotopic composition. The activation energy for chain termination is much higher than that for propagation, accounting for the observed decrease in the chain growth parameter are also estimated. Coverages by reaction intermediates are also estimated. When small amounts of 12C-labelled ethylene are added to 13CO/H 2 synthesismore » gas, ethylene acts as the sole chain initiator. Ethylene-derived carbon also accounts for 45% of the C 1 monomer pool. 102 refs., 29 figs., 11 tabs.« less

Authors:
 [1]
  1. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
10159366
Report Number(s):
LBL-31822
ON: DE92017085
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: TH: Thesis (Ph.D.); PBD: Jan 1992
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; FISCHER-TROPSCH SYNTHESIS; CATALYSTS; HYDROCARBONS; RUTHENIUM; TITANIUM OXIDES; GAS CHROMATOGRAPHY; MASS SPECTROSCOPY; CHEMICAL REACTION KINETICS; TRACER TECHNIQUES; DIFFERENTIAL EQUATIONS; COMPUTER CODES; HYDROGEN; CARBON MONOXIDE; 010405; 010408; HYDROGENATION AND LIQUEFACTION; C1 PROCESSES

Citation Formats

Krishna, Kamala Raghunathan. Isotopic tracer studies of Fischer-Tropsch Synthesis over Ru/TiO2 catalysts. United States: N. p., 1992. Web. doi:10.2172/10159366.
Krishna, Kamala Raghunathan. Isotopic tracer studies of Fischer-Tropsch Synthesis over Ru/TiO2 catalysts. United States. doi:10.2172/10159366.
Krishna, Kamala Raghunathan. Wed . "Isotopic tracer studies of Fischer-Tropsch Synthesis over Ru/TiO2 catalysts". United States. doi:10.2172/10159366. https://www.osti.gov/servlets/purl/10159366.
@article{osti_10159366,
title = {Isotopic tracer studies of Fischer-Tropsch Synthesis over Ru/TiO2 catalysts},
author = {Krishna, Kamala Raghunathan},
abstractNote = {Fischer-Tropsch synthesis is a process in which CO and H2 react to give predominantly liquid hydrocarbons. The reaction can be considered a special type of polymerization in which the monomer is produced in situ, and chain growth occurs by a sequence of independently repeated additions of the monomer to the growing chain. A investigation has been conducted to study the CO hydrogenation reaction in order to better understand catalyst deactivation and the elementary surface processes involved in chain growth. Isotopic tracers are used in conjunction with transient-response techniques in this study of Fischer-Tropsch synthesis over Ru/TiO2 catalysts. Experiments are conducted at a total pressure of 1 atmosphere, reaction temperatures of 453--498 K and D2/CO (or H2/CO) ratios of 2--5. Synthesis products are analyzed by gas chromatography or isotope-ratio gas chromatography-mass spectrometry. Rate constants for chain initiation, propagation and termination are evaluated under steady-state reaction conditions by using transients in isotopic composition. The activation energy for chain termination is much higher than that for propagation, accounting for the observed decrease in the chain growth parameter are also estimated. Coverages by reaction intermediates are also estimated. When small amounts of 12C-labelled ethylene are added to 13CO/H2 synthesis gas, ethylene acts as the sole chain initiator. Ethylene-derived carbon also accounts for 45% of the C1 monomer pool. 102 refs., 29 figs., 11 tabs.},
doi = {10.2172/10159366},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

Thesis/Dissertation:
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