Effect of H2S presence on chemical looping reforming (CLR) of biogas with a firebrick supported NiO oxygen carrier
Journal article, 2022

Biogas containing CH4 and CO2 can be used in CLR for H-2 generation, while the H2S presence may affect oxygen carrier activity and reforming property. In this study, a 2000 ppm H2S was mixed with modelled biogas (CH4/CO2 = 3/2) to explore its effects on the CLR process. Experiments were conducted in a batch fluidized bed using a firebrick supported NiO oxygen carrier. The presence of 2000 ppm H2S decreased the oxygen carrier activity, thus resulting in a significant lower gas yield from the biogas as compared to the cases without H2S. Increase of temperature slightly alleviated the interaction between H2S and the oxygen carrier, hence a slightly higher gas (H-2 and CO) yield was achieved at 950 degrees C than 750 and 850 degrees C. In reforming, H2S was mainly converted to CS2, while COS and SO2 were minors. After several cycles without H2S, the material restored its original activity. Sulfur element and NiS2 crystalline were found in the reduced oxygen carrier according to XRD, XPS, SEM-EDX, HRTEM-EDX and ICP-OES analyses.

Chemical Looping Reforming (CLR)

Sulfur

Ni-based oxygen carrier

Biogas conversion

Author

Teng Zheng

Huazhong Agricultural University

Mengjun Li

Huazhong Agricultural University

Daofeng Mei

Chalmers, Space, Earth and Environment, Energy Technology, Energy Technology 2

Huazhong Agricultural University

Jingjing Ma

Ningxia University

Baowen Wang

North China University of Water Resources & Electric Power

Zuwei Xu

Huazhong University of Science and Technology

Fuel Processing Technology

0378-3820 (ISSN)

Vol. 226 107088

Subject Categories

Chemical Process Engineering

Other Chemical Engineering

Other Chemistry Topics

DOI

10.1016/j.fuproc.2021.107088

More information

Latest update

12/30/2021