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Title: Enhanced Hydrogen Production Integrated with CO2 Separation in a Single-Stage Reactor

Abstract

Hydrogen production from coal gasification can be enhanced by driving the equilibrium limited Water Gas Shift reaction forward by incessantly removing the CO{sub 2} by-product via the carbonation of calcium oxide. This project uses the high-reactivity mesoporous precipitated calcium carbonate sorbent for removing the CO{sub 2} product to enhance H{sub 2} production. Preliminary experiments demonstrate the show the superior performance of the PCC sorbent over other naturally occurring calcium sorbents. It was observed that the CO{sub 2} released during the in-situ calcination causes the deactivation of the iron oxide WGS catalyst by changing the active phase of the catalyst from magnetite (F{sub 3}O{sub 4}). Detailed understanding of the iron oxide phase diagram helped in developing a catalyst pretreatment procedure using a H{sub 2}/H{sub 2}O system. Intermediate catalyst pretreatment helps prevent its deactivation by reducing the catalyst back to its active magnetite (Fe{sub 3}O{sub 4}) form. Multicyclic runs which consist of combined WGS/carbonation reaction followed by in-situ calcination with a subsequent catalyst pretreatment procedure sustains the catalytic activity and prevents deactivation. The water gas shift reaction was studied at different temperatures, different steam to carbon monoxide ratios (S/C) 3:1, 2:1, 1:1 and different total pressures ranging from 0-300 psig. The COmore » conversion was found to have an optimal value with increasing pressure, S/C ratio and temperatures. The combined water gas shift and carbonation reaction was investigated at 650 C, S/C ratio of 3:1and at different pressures of 0-300 psig.« less

Authors:
; ;
Publication Date:
Research Org.:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
898311
DOE Contract Number:  
FC26-03NT41853
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 08 HYDROGEN; CALCIUM; CALCIUM CARBONATES; CALCIUM OXIDES; CARBON MONOXIDE; COAL GASIFICATION; DEACTIVATION; HYDROGEN PRODUCTION; IRON OXIDES; PHASE DIAGRAMS; PRODUCTION; WATER GAS; CARBON DIOXIDE

Citation Formats

Mahesh Iyer, Shwetha Ramkumar, and Liang-Shih Fan. Enhanced Hydrogen Production Integrated with CO2 Separation in a Single-Stage Reactor. United States: N. p., 2006. Web. doi:10.2172/898311.
Mahesh Iyer, Shwetha Ramkumar, & Liang-Shih Fan. Enhanced Hydrogen Production Integrated with CO2 Separation in a Single-Stage Reactor. United States. doi:10.2172/898311.
Mahesh Iyer, Shwetha Ramkumar, and Liang-Shih Fan. Fri . "Enhanced Hydrogen Production Integrated with CO2 Separation in a Single-Stage Reactor". United States. doi:10.2172/898311. https://www.osti.gov/servlets/purl/898311.
@article{osti_898311,
title = {Enhanced Hydrogen Production Integrated with CO2 Separation in a Single-Stage Reactor},
author = {Mahesh Iyer and Shwetha Ramkumar and Liang-Shih Fan},
abstractNote = {Hydrogen production from coal gasification can be enhanced by driving the equilibrium limited Water Gas Shift reaction forward by incessantly removing the CO{sub 2} by-product via the carbonation of calcium oxide. This project uses the high-reactivity mesoporous precipitated calcium carbonate sorbent for removing the CO{sub 2} product to enhance H{sub 2} production. Preliminary experiments demonstrate the show the superior performance of the PCC sorbent over other naturally occurring calcium sorbents. It was observed that the CO{sub 2} released during the in-situ calcination causes the deactivation of the iron oxide WGS catalyst by changing the active phase of the catalyst from magnetite (F{sub 3}O{sub 4}). Detailed understanding of the iron oxide phase diagram helped in developing a catalyst pretreatment procedure using a H{sub 2}/H{sub 2}O system. Intermediate catalyst pretreatment helps prevent its deactivation by reducing the catalyst back to its active magnetite (Fe{sub 3}O{sub 4}) form. Multicyclic runs which consist of combined WGS/carbonation reaction followed by in-situ calcination with a subsequent catalyst pretreatment procedure sustains the catalytic activity and prevents deactivation. The water gas shift reaction was studied at different temperatures, different steam to carbon monoxide ratios (S/C) 3:1, 2:1, 1:1 and different total pressures ranging from 0-300 psig. The CO conversion was found to have an optimal value with increasing pressure, S/C ratio and temperatures. The combined water gas shift and carbonation reaction was investigated at 650 C, S/C ratio of 3:1and at different pressures of 0-300 psig.},
doi = {10.2172/898311},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 31 00:00:00 EST 2006},
month = {Fri Mar 31 00:00:00 EST 2006}
}

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