Selective Production of Terephthalonitrile and Benzonitrile via Pyrolysis of Polyethylene Terephthalate (PET) with Ammonia over Ca(OH)2/Al2O3 Catalysts

A series of Ca(OH)2/Al2O3 catalysts were synthesized for selectively producing N-containing chemicals from polyethylene terephthalate (PET) via catalytic fast pyrolysis with ammonia (CFP-A) process. During the CFP-A process, the ca...

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Main Authors:	Lujiang Xu, Xin-wen Na, Le-yao Zhang, Qian Dong, Guo-hua Dong, Yi-tong Wang, Zhen Fang
Format:	Article
Language:	English
Published:	MDPI AG 2019-05-01
Series:	Catalysts
Subjects:	benzonitrile terephthalonitrile polyethylene terephthalate (PET) catalytic pyrolysis ammonia Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>
Online Access:	https://www.mdpi.com/2073-4344/9/5/436

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spelling	doaj-0c37404c2f1443a28c2e1e8acda728972020-11-25T00:53:20ZengMDPI AGCatalysts2073-43442019-05-019543610.3390/catal9050436catal9050436Selective Production of Terephthalonitrile and Benzonitrile via Pyrolysis of Polyethylene Terephthalate (PET) with Ammonia over Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> CatalystsLujiang Xu0Xin-wen Na1Le-yao Zhang2Qian Dong3Guo-hua Dong4Yi-tong Wang5Zhen Fang6Biomass Group, College of Engineering, Nanjing Agricultural University, 40 Dianjiangtai Road, Nanjing 210031, Jiangsu, ChinaBiomass Group, College of Engineering, Nanjing Agricultural University, 40 Dianjiangtai Road, Nanjing 210031, Jiangsu, ChinaBiomass Group, College of Engineering, Nanjing Agricultural University, 40 Dianjiangtai Road, Nanjing 210031, Jiangsu, ChinaBiomass Group, College of Engineering, Nanjing Agricultural University, 40 Dianjiangtai Road, Nanjing 210031, Jiangsu, ChinaBiomass Group, College of Engineering, Nanjing Agricultural University, 40 Dianjiangtai Road, Nanjing 210031, Jiangsu, ChinaCollege of Metallurgy and Energy, North China University of Science and Technology, 21 Bohai Street, Tangshan 063210, ChinaBiomass Group, College of Engineering, Nanjing Agricultural University, 40 Dianjiangtai Road, Nanjing 210031, Jiangsu, ChinaA series of Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> catalysts were synthesized for selectively producing N-containing chemicals from polyethylene terephthalate (PET) via catalytic fast pyrolysis with ammonia (CFP-A) process. During the CFP-A process, the carboxyl group in PET plastic was efficiently utilized for the selective production of terephthalonitrile and benzonitrile by controlling the catalysts and pyrolysis parameters (e.g. temperature, residence time, ammonia content). The best conditions were selected as 2% Ca(OH)<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> (0.8 g), 500 °C under pure ammonia with 58.3 C% terephthalonitrile yield and 92.3% selectivity in nitriles. In addition, 4% Ca(OH)<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub> was suitable for producing benzonitrile. With catalyst dosage of 1.2 g, residence time of 1.87 s, pyrolysis temperature of 650 °C and pure ammonia (160 mL/min carrier gas flow rate), the yield and selectivity of benzonitrile were 30.4 C% and 82.6%, respectively. The catalysts deactivated slightly after 4 cycles.https://www.mdpi.com/2073-4344/9/5/436benzonitrileterephthalonitrilepolyethylene terephthalate (PET)catalytic pyrolysisammoniaCa(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Lujiang Xu Xin-wen Na Le-yao Zhang Qian Dong Guo-hua Dong Yi-tong Wang Zhen Fang
spellingShingle	Lujiang Xu Xin-wen Na Le-yao Zhang Qian Dong Guo-hua Dong Yi-tong Wang Zhen Fang Selective Production of Terephthalonitrile and Benzonitrile via Pyrolysis of Polyethylene Terephthalate (PET) with Ammonia over Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> Catalysts Catalysts benzonitrile terephthalonitrile polyethylene terephthalate (PET) catalytic pyrolysis ammonia Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>
author_facet	Lujiang Xu Xin-wen Na Le-yao Zhang Qian Dong Guo-hua Dong Yi-tong Wang Zhen Fang
author_sort	Lujiang Xu
title	Selective Production of Terephthalonitrile and Benzonitrile via Pyrolysis of Polyethylene Terephthalate (PET) with Ammonia over Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> Catalysts
title_short	Selective Production of Terephthalonitrile and Benzonitrile via Pyrolysis of Polyethylene Terephthalate (PET) with Ammonia over Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> Catalysts
title_full	Selective Production of Terephthalonitrile and Benzonitrile via Pyrolysis of Polyethylene Terephthalate (PET) with Ammonia over Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> Catalysts
title_fullStr	Selective Production of Terephthalonitrile and Benzonitrile via Pyrolysis of Polyethylene Terephthalate (PET) with Ammonia over Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> Catalysts
title_full_unstemmed	Selective Production of Terephthalonitrile and Benzonitrile via Pyrolysis of Polyethylene Terephthalate (PET) with Ammonia over Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> Catalysts
title_sort	selective production of terephthalonitrile and benzonitrile via pyrolysis of polyethylene terephthalate (pet) with ammonia over ca(oh)<sub>2</sub>/al<sub>2</sub>o<sub>3</sub> catalysts
publisher	MDPI AG
series	Catalysts
issn	2073-4344
publishDate	2019-05-01
description	A series of Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> catalysts were synthesized for selectively producing N-containing chemicals from polyethylene terephthalate (PET) via catalytic fast pyrolysis with ammonia (CFP-A) process. During the CFP-A process, the carboxyl group in PET plastic was efficiently utilized for the selective production of terephthalonitrile and benzonitrile by controlling the catalysts and pyrolysis parameters (e.g. temperature, residence time, ammonia content). The best conditions were selected as 2% Ca(OH)<sub>2</sub>/γ-Al<sub>2</sub>O<sub>3</sub> (0.8 g), 500 °C under pure ammonia with 58.3 C% terephthalonitrile yield and 92.3% selectivity in nitriles. In addition, 4% Ca(OH)<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub> was suitable for producing benzonitrile. With catalyst dosage of 1.2 g, residence time of 1.87 s, pyrolysis temperature of 650 °C and pure ammonia (160 mL/min carrier gas flow rate), the yield and selectivity of benzonitrile were 30.4 C% and 82.6%, respectively. The catalysts deactivated slightly after 4 cycles.
topic	benzonitrile terephthalonitrile polyethylene terephthalate (PET) catalytic pyrolysis ammonia Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>
url	https://www.mdpi.com/2073-4344/9/5/436
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_version_	1725237959676919808

Selective Production of Terephthalonitrile and Benzonitrile via Pyrolysis of Polyethylene Terephthalate (PET) with Ammonia over Ca(OH)<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> Catalysts

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