Low-Temperature Catalytic Cracking of Biomass Gasification Tar Over Ni/HZSM-5.

Tar is a major bottleneck for advancing biomass gasification in industrial applications, and therefore it is necessary to develop a clean and efficient tar elimination technology. Experiments of ex-situ real tar catalytic cracking to produce syngas under low temperature condition were proposed in this study with Ni supported by HZSM-5 as catalyst. The effects of various reaction conditions on catalytic performance were investigated, and the mechanisms of tar cracking and coke formation were also discussed by XRD, ICP-MS and BET analysis. Results showed that tar conversion and heat value of gaseous products were 91.52 wt% and 6.40 MJ/Nm³, respectively, when temperature was 500 °C, WHSV was 0.65 h⁻¹ and Ni loading content was 6 wt%. However, coking rate of catalyst was higher than 19.20 wt%. HZSM-5 supported Ni exhibited remarkable tar cracking ability and it could also improve heating value of gaseous products, but coke deactivation of catalyst should be further investigated. [ABSTRACT FROM AUTHOR]