Recent advances of sodium borohydride reduction in coal water slurry desulfurization: integration of chemical and electrochemical reduction

Abstract

Clean fuel technologies have been widely developed in current society because fuel combustion can directly bring about the emission of hazardous gasses, i.e. SO 2 , sulfate particulate matter (SPM), resulting in environmental pollution and other related problems that endanger public heath and community property; as well as reducing the life of the engine due to corrosion. The research efforts for developing conventional hydrodesulfurization (HDS) and alternative desulfurization methods such as selective adsorption, biodesulfurization, oxidation/extraction (oxidative desulfurization), etc. for removing these refractory sulfur compounds from liquid fuel products are on the rise. The reductive desulfurization method under ambient conditions has rarely been researched. This paper reviews the current status of various desulphurization techniques being studied worldwide. It presents an overview of novel emerging technologies of chemical and electrochemical reduction (CECR) for deep desulfurization of coal water slurry (CWS) so as to provide a new way of thinking about ultraclean fuel technology.

Desulfurization kinetics and mineral phase evolution of bauxite water slurry (BWS) electrolysis

“…All the methods are still problematic due to lower efficiency, surrounding pollution and harsh reaction conditions, hindering their application. However, ore water slurry electrolysis can solve above problems in removal of sulfur (Zhong et al, 2011;Wapner et al, 1988;Farooque and Coughlin, 1979;Lam et al, 2012;Shen et al, 2012). Electrolysis not only achieved higher desulfurization efficiency under mild condition, but also reduced the pollution of the environment risk (Li, 2000;Lalvani and Pata, 1983;Lavani, 1985;Lalvani et al, 1985).…”

Characterization of humic acids extracted from a lignite and interpretation for the mass spectra

“…Alkali treatment is conducive to a coal desulfurization reaction. [27][28][29] The surface of the residue became smooth (Fig. 3(c)), and the content of Na was obviously reduced aer treatment with acid.…”

Application of mass spectrometry in the characterization of chemicals in coal‐derived liquids

“…Oxidation with different oxidants, such as NaOCl, H 2 O 2 , and HNO 3 , has been extensively used for coal desulfurization (Li & Cho, 2005;Carrillo-Pedroza et al, 2009;Fallavena et al, 2012;Shen et al, 2012). Therefore, there should be SCCs present in the products from mild oxidation of coals.…”