Pressurized Calcium Looping in the Presence of Steam in a Spout-Fluidized-Bed Reactor with DFT Analysis

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Title: Pressurized Calcium Looping in the Presence of Steam in a Spout-Fluidized-Bed Reactor with DFT Analysis
Authors: Fennell, PS
Yao, JG
Maitland, GC
Zhang, Z
Item Type: Journal Article
Abstract: Calcium looping is a high-temperature solid-looping process for CO2 capture, exploiting cyclical carbonation of CaO. Previous work investigating the effects of steam on the carbonation reaction has produced conflicting results, with the majority of work conducted using thermogravimetric analyzers (TGA). Here, pressurized carbonation kinetics in the presence of steam in a 3 kWe pressurized spout-fluidized bed reactor, gives a rigorous insight into the effects of steam. Pseudo-intrinsic kinetics were determined using an effectiveness factor model along with activation energies and kinetic expressions. The mechanism in which steam promotes CO2 adsorption on the surface of CaO was investigated using density functional theory (DFT). The molecular-scale changes on the CaO surface owing to the presence of steam compared to the base case of CO2 adsorption on a ‘clean’ (without steam) surface were simulated with the Cambridge Serial Total Energy Package (CASTEP) software. The results suggest that steam promotes CO2 adsorption via the formation of surface OH groups on the CaO surface.
Issue Date: 21-Sep-2017
Date of Acceptance: 11-Sep-2017
URI: http://hdl.handle.net/10044/1/50759
DOI: https://dx.doi.org/10.1016/j.fuproc.2017.09.006
ISSN: 0378-3820
Publisher: Elsevier
Start Page: 24
End Page: 41
Journal / Book Title: Fuel Processing Technology
Volume: 169
Copyright Statement: © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: ERI 023708/EP/K000446/1
Keywords: 0904 Chemical Engineering
0306 Physical Chemistry (Incl. Structural)
Energy
Publication Status: Published
Appears in Collections:Faculty of Engineering
Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences



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