Feasibility Application of Cu-Contaminated Soil on the Removal of H₂S from Hot Coal Gas

Abstract

In this study Cu-contaminated soils were chosen as a candidate material for the removal of hydrogen sulfide (H 2 S) from hot coal gas. Experimental results showed that the H 2 S was significantly reduced below 10 ppm when the Cu-contaminated soils were reacted with H 2 S. The optimal removal temperature of H 2 S was found to be at 923 K in the operating conditions. In addition to Cu species, free Fe oxides in the contaminated soils also performed an active species to react with H 2 S and enhanced the overall sulfur capacity. Through the XPS analysis, Fe sulfide (FeS) and Cu sulfide (Cu 2 S) were the major products after removal experiments. Regeneration experimental results also indicated that the Cu-contaminated soils can be regenerated by pass air and thus be reused for many times.

Measurement of Total Free Iron in Soils by H2S Chemisorption and Comparison with the Citrate Bicarbonate Dithionite Method

“…To overcome these shortcomings, an alternative analyzed method was developed and assessed for the determination of total free iron contents of soils in this study. On the other hand, a series of the reactions between iron oxides and H 2 S were experimentally performed at high temperature and results showed that the high reactivity between iron oxides and H 2 S was observed in our previous literatures [10–12]. Accordingly, the main objective of this research is to determine the total free iron contents by the chemisorption approach based on the thermodynamic knowledge.…”

Fate of Copper in Saline–Alkali Soil with Long-Term Application of Biogas Residue

“…XPS is a surface analysis method that can give important information about the kinds of elements, chemical composition and related electronic structures on the surface of solid samples [43][44][45]. XPS can clarify the chemical state of atoms bound with Cu ions in soil [46][47][48][49]. In Figure 6, the survey scans of SAS contained O, C, Si, Ca, Al and Mg.…”

Removal of hydrogen sulfide and ammonia from biogas using Oldoinyo Lengai Volcanic ash

“…(Siefers et al, 2010). Studies have shown that oxide of iron and copper species are active components in reacting with H2S from hot coal gas (Huang and Ko, 2015). Comparative test between copper and iron oxides indicated that iron oxides species were highly reactive and efficient in removing hydrogen sulfide from coal gas.…”

“…Comparative test between copper and iron oxides indicated that iron oxides species were highly reactive and efficient in removing hydrogen sulfide from coal gas. The use of contaminated soil is a new technology which has a potential use in solving serious problems related to removing heavy metals and H2S by applying into the method for hydrogen sulfide removal from coal gas stream at elevated temperature (Hsueh and Ko, 2012;Huang and Ko, 2015). Several technologies used to remove H2S from biogas have been reported such as the gas-gas membrane, alkaline/amine scrubbing, chemical oxidation, adsorption, bio-filtration, and catalytic wet oxidation (Lien et al, 2014).…”

“…Besides, calcium aluminate supported by nickel oxide is also known for its ability to remove hydrogen sulfide from biogas stream at elevated temperature between 730 and 950 °C whereas, iron-rich soil and copper-rich soil materials are known for their effectiveness in remove hydrogen sulfide at the temperature ranging from 800 to 970 °C (Bagreev and Bandosz, 2005;Awe et al, 2017). Iron oxide has been investigated for H2S removal in different conditions at room temperature (Magomnang and Villanueva, 2014;Huang and Ko, 2015).…”