Desulfurization Performance of Rare Earth Mono-substituted Heteropoly Compounds

Xiaoning Pei,Rui Wang

doi:10.4209/aaqr.2019.10.0540

Abstract

ABSTRACT In this study, a series of rare earth monosubstituted Dawson-type polyoxometalates were synthesized for highly effective removal of hydrogen sulfide (H2S). The unused, used and regenerated polyoxometalates were characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The results confirmed that K17[Pr(P2Mo17O61)2] could maintain a complete Dawson-type structure even after absorption and regeneration. H2S absorption study showed that K17[Pr(P2Mo17O61)2] had the remarkable desulfurization and regeneration capabilities. Optimization experiments showed that K17[Pr(P2Mo17O61)2] under the condition of low H2S concentration or high dosage of K17[Pr(P2Mo17O61)2] had the ideal desulfurization performance. An appropriate temperature of 25°C is necessary for high removal efficiency. The optimum pH value for desulfurization is 6.8. The desulfurization product was proved to be SO42–.

Highlights

Hydrogen sulfide (H2S) is a common pollutant in oil and gas production/processing, wastewater treatment plants, fossil fuel combustion, and landfill gases (Ko et al, 2015; Bamdad et al, 2018; Widiana et al, 2019)
Fourier transform infrared spectroscopy (FT-IR) Spectrum of LnPMo Optical characterizations of the compounds were performed by the FT-IR spectroscopy
The results showed that H2S removal efficiency increased significantly with the pH increase from 1 to 5, but it slightly decreased with the pH increase from 5 to 9

Summary

Introduction

Hydrogen sulfide (H2S) is a common pollutant in oil and gas production/processing, wastewater treatment plants, fossil fuel combustion, and landfill gases (Ko et al, 2015; Bamdad et al, 2018; Widiana et al, 2019). Dry method of desulfurization is carried out by using a solid adsorbent such as activated carbons (Xie et al, 2017; Liu et al, 2019), metal oxides, molecular sieves or metal elements (Zhang et al, 2017; Cheng et al, 2018). This method is simple and easy to operate, but the adsorbents have the disadvantages of poor regenerability and high

Methods

Results

Conclusion