Issue 10, 2012

Rapid desulfurization of CWS via ultrasonic enhanced metal boron hydridesreduction under ambient conditions

Abstract

The present work investigated a rapid desulfurization method for industrial coal water slurry (CWS) using ultrasound-assisted metal boron hydrides (NaBH4, KBH4) reduction. Under ambient pressure and temperature conditions of ultrasonic time (10 min), ultrasonic frequency (20 KHz), deoxidizer concentration (10 mM), CWS concentration (60 g L−1) and coal particle size (≤ 120 mesh), the desulfurization efficiency of CWS can reach about 42% (NaBH4) and 45% (KBH4), respectively. On addition of Ni2+ catalyst (1 mM), the desulfurization efficiency, up to a maximum value of 57%, was significantly improved. Meanwhile, the nitrogen reduction (N) of CWS was reduced by 11.5%. The decrease of S and N greatly cut down SOx and NOx emissions from CWS combustion. After the processing, the ash content and volatile matter were decreased contributing to the slight improvement of combustion characteristics.

Graphical abstract: Rapid desulfurization of CWS via ultrasonic enhanced metal boron hydrides reduction under ambient conditions

Article information

Article type
Paper
Submitted
30 Nov 2011
Accepted
23 Feb 2012
First published
22 Mar 2012

RSC Adv., 2012,2, 4189-4197

Rapid desulfurization of CWS via ultrasonic enhanced metal boron hydrides reduction under ambient conditions

Y. Shen, T. Sun, X. Liu and J. Jia, RSC Adv., 2012, 2, 4189 DOI: 10.1039/C2RA01207C

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