Effect of SiO2 on loss of catalysis of inherent metallic species in CO2 gasification of coke from lignite

Inherent metallic species retained by coal char or coke, such as Na and Ca, behave as catalysts in gasification. The char/coke normally contains inherent SiO2, which can react with the inherent catalysts to form silicates, resulting in catalyst deactivation over the range of pyrolysis, carbonization...

Full description

Bibliographic Details
Main Authors:	Cheolyong Choi, U.P.M. Ashik, Shinji Kudo, Kazuya Uebo, Koyo Norinaga, Jun-ichiro Hayashi
Format:	Article
Language:	English
Published:	KeAi Communications Co., Ltd. 2019-04-01
Series:	Carbon Resources Conversion
Online Access:	http://www.sciencedirect.com/science/article/pii/S2588913318300474

id	doaj-726b6fd45067401ba9b73d358ebf2999
record_format	Article
spelling	doaj-726b6fd45067401ba9b73d358ebf29992021-02-02T03:42:06ZengKeAi Communications Co., Ltd.Carbon Resources Conversion2588-91332019-04-01211322Effect of SiO2 on loss of catalysis of inherent metallic species in CO2 gasification of coke from ligniteCheolyong Choi0U.P.M. Ashik1Shinji Kudo2Kazuya Uebo3Koyo Norinaga4Jun-ichiro Hayashi5Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, JapanInstitute for Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, JapanInstitute for Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan; Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, JapanProcess Research Laboratories, Nippon Steel & Sumitomo Metal Corporation, 20-1, Shintomi, Futtsu 293-8511, JapanDepartment of Materials Science and Engineering, School of Engineering, Nagoya University, Nagoya, Aichi 464-8601, JapanInstitute for Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan; Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan; Transdisciplinary Research and Education Center of Green Technology, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan; Corresponding author at: Institute for Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan.Inherent metallic species retained by coal char or coke, such as Na and Ca, behave as catalysts in gasification. The char/coke normally contains inherent SiO2, which can react with the inherent catalysts to form silicates, resulting in catalyst deactivation over the range of pyrolysis, carbonization and gasification, and thereby reducing the char/coke reactivity. The present authors simulated the inherent catalyst deactivation experimentally by blending a Victorian lignite with SiO2, briquetting the SiO2/lignite blend, carbonizing the briquette, and then gasifying the coke with CO2. The kinetic analysis of the gasification employed a comprehensive model, which assumed progress in parallel of non-catalytic and catalytic gasification. The model quantitatively described the measured kinetics of the coke gasification with different SiO2 contents over a range of coke conversion up to 99.9%. The kinetic analysis revealed that the SiO2 deactivated substantial and entire portions of the most active catalyst and its precursor, respectively, before the gasification (i.e., during the carbonization). The catalyst deactivation also occurred during the gasification, but mainly following a self-deactivation mechanism that involved no silicates formation. Keywords: Coke, Lignite, Reactivity, CO2 gasification, Inherent metallic species, Catalyst, Deactivation, SiO2http://www.sciencedirect.com/science/article/pii/S2588913318300474
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Cheolyong Choi U.P.M. Ashik Shinji Kudo Kazuya Uebo Koyo Norinaga Jun-ichiro Hayashi
spellingShingle	Cheolyong Choi U.P.M. Ashik Shinji Kudo Kazuya Uebo Koyo Norinaga Jun-ichiro Hayashi Effect of SiO2 on loss of catalysis of inherent metallic species in CO2 gasification of coke from lignite Carbon Resources Conversion
author_facet	Cheolyong Choi U.P.M. Ashik Shinji Kudo Kazuya Uebo Koyo Norinaga Jun-ichiro Hayashi
author_sort	Cheolyong Choi
title	Effect of SiO2 on loss of catalysis of inherent metallic species in CO2 gasification of coke from lignite
title_short	Effect of SiO2 on loss of catalysis of inherent metallic species in CO2 gasification of coke from lignite
title_full	Effect of SiO2 on loss of catalysis of inherent metallic species in CO2 gasification of coke from lignite
title_fullStr	Effect of SiO2 on loss of catalysis of inherent metallic species in CO2 gasification of coke from lignite
title_full_unstemmed	Effect of SiO2 on loss of catalysis of inherent metallic species in CO2 gasification of coke from lignite
title_sort	effect of sio2 on loss of catalysis of inherent metallic species in co2 gasification of coke from lignite
publisher	KeAi Communications Co., Ltd.
series	Carbon Resources Conversion
issn	2588-9133
publishDate	2019-04-01
description	Inherent metallic species retained by coal char or coke, such as Na and Ca, behave as catalysts in gasification. The char/coke normally contains inherent SiO2, which can react with the inherent catalysts to form silicates, resulting in catalyst deactivation over the range of pyrolysis, carbonization and gasification, and thereby reducing the char/coke reactivity. The present authors simulated the inherent catalyst deactivation experimentally by blending a Victorian lignite with SiO2, briquetting the SiO2/lignite blend, carbonizing the briquette, and then gasifying the coke with CO2. The kinetic analysis of the gasification employed a comprehensive model, which assumed progress in parallel of non-catalytic and catalytic gasification. The model quantitatively described the measured kinetics of the coke gasification with different SiO2 contents over a range of coke conversion up to 99.9%. The kinetic analysis revealed that the SiO2 deactivated substantial and entire portions of the most active catalyst and its precursor, respectively, before the gasification (i.e., during the carbonization). The catalyst deactivation also occurred during the gasification, but mainly following a self-deactivation mechanism that involved no silicates formation. Keywords: Coke, Lignite, Reactivity, CO2 gasification, Inherent metallic species, Catalyst, Deactivation, SiO2
url	http://www.sciencedirect.com/science/article/pii/S2588913318300474
work_keys_str_mv	AT cheolyongchoi effectofsio2onlossofcatalysisofinherentmetallicspeciesinco2gasificationofcokefromlignite AT upmashik effectofsio2onlossofcatalysisofinherentmetallicspeciesinco2gasificationofcokefromlignite AT shinjikudo effectofsio2onlossofcatalysisofinherentmetallicspeciesinco2gasificationofcokefromlignite AT kazuyauebo effectofsio2onlossofcatalysisofinherentmetallicspeciesinco2gasificationofcokefromlignite AT koyonorinaga effectofsio2onlossofcatalysisofinherentmetallicspeciesinco2gasificationofcokefromlignite AT junichirohayashi effectofsio2onlossofcatalysisofinherentmetallicspeciesinco2gasificationofcokefromlignite
_version_	1724307250960400384

Effect of SiO2 on loss of catalysis of inherent metallic species in CO2 gasification of coke from lignite

Similar Items