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Efficient Air Desulfurization Catalysts Derived from Pig Manure Liquefaction Char

Department of Chemistry and Biochemistry, The City College of New York, New York, NY 10031, USA
Department of Civil, Architectural and Environmental Engineering, North Carolina A&T State University, 1601 E. Market St., Greensboro, NC 27411, USA
On leave from Department of Chemical Engineering, Maulana Azad National Institute of Technology Bhopal, Bhopal 462 003, India.
Author to whom correspondence should be addressed.
Received: 24 October 2017 / Revised: 15 November 2017 / Accepted: 17 November 2017 / Published: 20 November 2017
(This article belongs to the Special Issue Smart Carbon Materials in Catalysis)
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Biochar from the liquefaction of pig manure was used as a precursor of H2S desulfurization adsorbents. In its inorganic matter, it contains marked quantities of calcium, magnesium and iron, which are known as hydrogen sulfide oxidation catalysts. The char was used either as-received or mixed with 10% nanographite. The latter was added to increase both the content of the carbon phase and conductivity. ZnCl2 in two different ratios of char to an activation agent (1:1 and 1:2) was used to create the porosity in the carbon phase. The content of the later was between 18–45%. The activated samples adsorbed 144 mg/g H2S. Sulfur was the predominant product of reactive adsorption. Its deposition in the pore system and blockage of the most active pores ceased the materials’ activity. The presence of the catalytic phase was necessary but not sufficient to guarantee good performance. The developed porosity, which can store oxidation products in the resulting composite, is essential for the good performance of the desulfurization process. The surface of the composite with nanographite showed the highest catalytic activity, similar to that of the commercial Midas® carbon catalyst. The results obtained indicate that a high quality reactive adsorbent/catalyst for H2S removal can be obtained from pig manure liquefaction wastes. View Full-Text
Keywords: pig manure; chemical activation; hydrogen sulfide removal; surface chemistry; porosity pig manure; chemical activation; hydrogen sulfide removal; surface chemistry; porosity

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Wallace, R.; Suresh, S.; Fini, E.H.; Bandosz, T.J. Efficient Air Desulfurization Catalysts Derived from Pig Manure Liquefaction Char. C 2017, 3, 37.

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