The rate and extent of uptake of CO 2 by a synthetic, CaO-containing sorbent
A synthetic, Ca-based solid sorbent, showed a marked increase in its ultimate uptake for CO 2 at temperatures in excess of 750 °C when the concentration of CO 2 was increased during carbonation in a fluidised bed. In contrast, the uptakes by natural sorbents, e.g. dolomite, were relatively insensiti...
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Veröffentlicht in: | Chemical engineering science 2009-05, Vol.64 (9), p.2147-2157 |
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description | A synthetic, Ca-based solid sorbent, showed a marked increase in its ultimate uptake for CO
2 at temperatures in excess of 750
°C when the concentration of CO
2 was increased during carbonation in a fluidised bed. In contrast, the uptakes by natural sorbents, e.g. dolomite, were relatively insensitive to the concentration of CO
2. It is apparent that the rate of reaction of the synthetic sorbent falls to zero once the small pores within the grains, of which the particle is composed, have largely filled and a thin layer of product has been deposited around each grain. To quantify this effect, theory has been developed in which the mechanical work required to disrupt the layer of product is taken into account. The resulting model for the overall uptake correlates experimental measurements well, except in circumstances where carbonation times are so long that sintering introduces gross changes in the morphology of the layer of product. The explanation for why the overall conversion of the synthetic sorbent is dependent on the concentration of CO
2, whilst the conversion of dolomite is insensitive to [CO
2], is attributed to differences in the yield stress,
σ
Y
, needed to disrupt the layer of product formed in the two materials. It was found that the value of
σ
Y
for dolomite is about an order of magnitude larger than that for the synthetic sorbent. The behaviour of the synthetic sorbent in response to increasing concentrations of CO
2 makes it an attractive solid for the separation of CO
2 from, e.g. the flue gases arising from combustion. By subsequently calcining the resulting solid, a pure stream of CO
2 can be produced whilst the sorbent is regenerated for further use. |
doi_str_mv | 10.1016/j.ces.2009.01.051 |
format | Article |
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2 at temperatures in excess of 750
°C when the concentration of CO
2 was increased during carbonation in a fluidised bed. In contrast, the uptakes by natural sorbents, e.g. dolomite, were relatively insensitive to the concentration of CO
2. It is apparent that the rate of reaction of the synthetic sorbent falls to zero once the small pores within the grains, of which the particle is composed, have largely filled and a thin layer of product has been deposited around each grain. To quantify this effect, theory has been developed in which the mechanical work required to disrupt the layer of product is taken into account. The resulting model for the overall uptake correlates experimental measurements well, except in circumstances where carbonation times are so long that sintering introduces gross changes in the morphology of the layer of product. The explanation for why the overall conversion of the synthetic sorbent is dependent on the concentration of CO
2, whilst the conversion of dolomite is insensitive to [CO
2], is attributed to differences in the yield stress,
σ
Y
, needed to disrupt the layer of product formed in the two materials. It was found that the value of
σ
Y
for dolomite is about an order of magnitude larger than that for the synthetic sorbent. The behaviour of the synthetic sorbent in response to increasing concentrations of CO
2 makes it an attractive solid for the separation of CO
2 from, e.g. the flue gases arising from combustion. By subsequently calcining the resulting solid, a pure stream of CO
2 can be produced whilst the sorbent is regenerated for further use.</description><identifier>ISSN: 0009-2509</identifier><identifier>EISSN: 1873-4405</identifier><identifier>DOI: 10.1016/j.ces.2009.01.051</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Ca-based sorbents ; CO 2 capture ; Environment ; Fluidization ; Powder technology ; Reaction engineering</subject><ispartof>Chemical engineering science, 2009-05, Vol.64 (9), p.2147-2157</ispartof><rights>2009 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.ces.2009.01.051$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Dennis, J.S.</creatorcontrib><creatorcontrib>Pacciani, R.</creatorcontrib><title>The rate and extent of uptake of CO 2 by a synthetic, CaO-containing sorbent</title><title>Chemical engineering science</title><description>A synthetic, Ca-based solid sorbent, showed a marked increase in its ultimate uptake for CO
2 at temperatures in excess of 750
°C when the concentration of CO
2 was increased during carbonation in a fluidised bed. In contrast, the uptakes by natural sorbents, e.g. dolomite, were relatively insensitive to the concentration of CO
2. It is apparent that the rate of reaction of the synthetic sorbent falls to zero once the small pores within the grains, of which the particle is composed, have largely filled and a thin layer of product has been deposited around each grain. To quantify this effect, theory has been developed in which the mechanical work required to disrupt the layer of product is taken into account. The resulting model for the overall uptake correlates experimental measurements well, except in circumstances where carbonation times are so long that sintering introduces gross changes in the morphology of the layer of product. The explanation for why the overall conversion of the synthetic sorbent is dependent on the concentration of CO
2, whilst the conversion of dolomite is insensitive to [CO
2], is attributed to differences in the yield stress,
σ
Y
, needed to disrupt the layer of product formed in the two materials. It was found that the value of
σ
Y
for dolomite is about an order of magnitude larger than that for the synthetic sorbent. The behaviour of the synthetic sorbent in response to increasing concentrations of CO
2 makes it an attractive solid for the separation of CO
2 from, e.g. the flue gases arising from combustion. By subsequently calcining the resulting solid, a pure stream of CO
2 can be produced whilst the sorbent is regenerated for further use.</description><subject>Ca-based sorbents</subject><subject>CO 2 capture</subject><subject>Environment</subject><subject>Fluidization</subject><subject>Powder technology</subject><subject>Reaction engineering</subject><issn>0009-2509</issn><issn>1873-4405</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNp9kE1PwzAMhiMEEmPwA7jlBBdanKRpVnFCFV_SpF3GOUpTh2WMdDQZYv-eTHDmZFt-bL16CLlkUDJg9e26tBhLDtCUwEqQ7IhM2EyJoqpAHpMJ5E3BJTSn5CzGdR6VYjAh8-UK6WgSUhN6it8JQ6KDo7ttMu946NoF5bTbU0PjPqQVJm9vaGsWhR1CMj748EbjMHb58JycOLOJePFXp-T18WHZPhfzxdNLez8vkDEpcyTZQyO5qJWo0XWcScedYMyZmWxmtpJKNYrn4MYBYzV3XEEH0DkURtpKTMn179_tOHzuMCb94aPFzcYEHHZRNyDq_ARkJq_-JUVV1TMFIoN3vyDm3F8eRx2tx2Cx9yPapPvBawb64FqvdXatD641MJ1dix8hTHBA</recordid><startdate>20090501</startdate><enddate>20090501</enddate><creator>Dennis, J.S.</creator><creator>Pacciani, R.</creator><general>Elsevier Ltd</general><scope>7U5</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>L7M</scope></search><sort><creationdate>20090501</creationdate><title>The rate and extent of uptake of CO 2 by a synthetic, CaO-containing sorbent</title><author>Dennis, J.S. ; Pacciani, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-e1155-445d095236736efb215f2f311fa8598c4577972405af01162f270b00bfe3a5c43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Ca-based sorbents</topic><topic>CO 2 capture</topic><topic>Environment</topic><topic>Fluidization</topic><topic>Powder technology</topic><topic>Reaction engineering</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dennis, J.S.</creatorcontrib><creatorcontrib>Pacciani, R.</creatorcontrib><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Chemical engineering science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dennis, J.S.</au><au>Pacciani, R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The rate and extent of uptake of CO 2 by a synthetic, CaO-containing sorbent</atitle><jtitle>Chemical engineering science</jtitle><date>2009-05-01</date><risdate>2009</risdate><volume>64</volume><issue>9</issue><spage>2147</spage><epage>2157</epage><pages>2147-2157</pages><issn>0009-2509</issn><eissn>1873-4405</eissn><abstract>A synthetic, Ca-based solid sorbent, showed a marked increase in its ultimate uptake for CO
2 at temperatures in excess of 750
°C when the concentration of CO
2 was increased during carbonation in a fluidised bed. In contrast, the uptakes by natural sorbents, e.g. dolomite, were relatively insensitive to the concentration of CO
2. It is apparent that the rate of reaction of the synthetic sorbent falls to zero once the small pores within the grains, of which the particle is composed, have largely filled and a thin layer of product has been deposited around each grain. To quantify this effect, theory has been developed in which the mechanical work required to disrupt the layer of product is taken into account. The resulting model for the overall uptake correlates experimental measurements well, except in circumstances where carbonation times are so long that sintering introduces gross changes in the morphology of the layer of product. The explanation for why the overall conversion of the synthetic sorbent is dependent on the concentration of CO
2, whilst the conversion of dolomite is insensitive to [CO
2], is attributed to differences in the yield stress,
σ
Y
, needed to disrupt the layer of product formed in the two materials. It was found that the value of
σ
Y
for dolomite is about an order of magnitude larger than that for the synthetic sorbent. The behaviour of the synthetic sorbent in response to increasing concentrations of CO
2 makes it an attractive solid for the separation of CO
2 from, e.g. the flue gases arising from combustion. By subsequently calcining the resulting solid, a pure stream of CO
2 can be produced whilst the sorbent is regenerated for further use.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.ces.2009.01.051</doi><tpages>11</tpages></addata></record> |
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ispartof | Chemical engineering science, 2009-05, Vol.64 (9), p.2147-2157 |
issn | 0009-2509 1873-4405 |
language | eng |
recordid | cdi_proquest_miscellaneous_903645705 |
source | Elsevier ScienceDirect Journals Complete |
subjects | Ca-based sorbents CO 2 capture Environment Fluidization Powder technology Reaction engineering |
title | The rate and extent of uptake of CO 2 by a synthetic, CaO-containing sorbent |
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