(420h) Low Temperature Catalysts for Direct Remediation of H2S Malodor in Air

Authors: 
Chen, H., The Hong Kong University of Science and Technology
Han, W., The Hong Kong University of Science and Technology
Yeung, K. L., The Hong Kong University of Science and Technology

Low temperature catalysts for direct remediation of H2S malodor in air

Gabriel Kei Bo Cheung1, Hao Chen1,3,Wei Han1, King Lun Yeung1,2,*

1Department of Chemical and Biomolecular Engineering, 2Division of Environment, 3Nano Science and Technology Program, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P.R. China

*Corresponding author: kekyeung@ust.hk

Division:  22 Nanoscale Science and Engineering Forum

Subdivision: 22001 Poster Session: Nanoscale Science and Engineering

Format: Poster

Abstract:

        Malodor causes discomfort, and long term exposure can have serious health consequences. H2S is one of the major malodor pollutants generated from anaerobic decomposition of sulfur-containing organic matter, and often found in household and industrial wastes, especially along the sewer line.

Existing solutions to H2S including Claus process, which uses catalyst to convert H2S into sulfur at high temperature (about 500 K), and adsorbents, is energy-consuming and not sustainable. This work presents a new route to convert H2S under room temperature and humid conditions, which suits for the applications near the malodor source such as sewer.

In this study, the vanadia-titania catalyst (V2O5/TiO2) is successfully developed to treat H2S at room temperature. The above catalyst was prepared by using rotary evaporator to evenly distribute ammonium vanadate on UV100 powder. The obtained catalysts are tested under different concentration ranging from 3.33 to 33.3ppm with a flow of 210cm3/min at room temperature. A conversion of 35% can be maintained for 25mg catalyst with 33.3ppm H2S, 210cm3/min. The fresh and used catalysts were characterized by XRD, micro-Raman and X-ray photoelectron spectroscopy in order to identify the active sites and confirm the formation of elemental sulfur on the catalyst. The catalytic reaction under humid condition was also conducted, and the result shows that the catalytic performance of V2O5/TiO2 catalyst is not sensitive to humidity of reaction system.