Preparation of odour removal catalysts with self-regeneration capability

Yongxiang Zhao,Yu Huang,Haoyi Chen,Lili Zhao,Tiancun Xiao

doi:10.1007/s13203-016-0155-0

Yongxiang Zhao, Yu Huang + Show 3 more

Open Access

https://doi.org/10.1007/s13203-016-0155-0

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Abstract

Odours remain at the top of air pollution complaints both indoor and outdoor, which can come from sewage, rotten food, and human digestions. Activated carbon has been used to absorb the odour materials, but its physical absorption can easily be saturated and could be a potential pollution source when less odour compounds exist in the surrounding environment. Here, for the first time, we have developed an activated carbon-alumina composite-supported ZnCu bimetallic metal oxide catalyst, which not only has very high capacity to absorb the strong smell sulfide, but also can convert sulfide into sulfur by the oxygen in air and the organic sulfur into sulfone, which removes the odour material in a chemical way and also endows the self-regeneration ability for the sorbent, leading to a longer and more efficient way to control odour in air. The ZnCu catalyst which contains 50 % of active carbon in the support has the highest sulfur capacity. The preparation parameters, such as calcination temperature, composition of the active components, and the test conditions, have a significant effect on the odour removal capability, and the conversion over the catalyst. The main structure of the bimetallic oxide catalysts does not change even after half-year industrial site use, which completely converts sulfur into sulfur powder and also convert CO into CO2. The surface morphology changes, while the main crystalline structure remains, which showed the self-regenerability of the catalyst.

Highlights

Odour problems arising from sewage, furniture, or human and pet’s activities have been continuing to grow in significance over recent years. [1,2,3,4,5,6]
The performance of odour removal were closely related to the physical properties
After the sulfur removal catalyst is used in open air for more than a half year, while the catalyst is still active, its X-ray diffraction (XRD) pattern showed almost the same diffraction as the fresh one, there is some amount of sulfur in the blanket. This suggests that the catalyst has self-regenerate capability; it keeps the oxide as the active phase, the sulfur is converted into sulfur powder

Summary

Introduction

Odour problems arising from sewage, furniture, or human and pet’s activities have been continuing to grow in significance over recent years. [1,2,3,4,5,6]. We have developed a self-regenerable catalyst types sorbent, which can effectively convert H2S and COS into sulfur powder and convert CO into CO2, removing the odour in an actively chemical ways.

Results

Conclusion