CO₂ Reforming Of Toluene On Ni/Palygorskite Using Toluene As Model Compound

With the depletion of fossil fuels, biomass attracts more and more attention as biomass is a typical renewable energy. Pyrolysis gasification technology is one of most-effective used technologies for biomass. Based on the previous study on palygorskite, Ni/PG catalysts were preparated while PG was used as catalyst support and Ni was loaded on PG.In our study, toluene was introduced as tar model compound. Then, a study of CO₂ reforming of toluene was carried out on Ni/PG in this paper.Based on the prevous and current achievement in biomass field, a laboratory-scale gas-solid multiphase catalytic reaction system was established. The analysis work on the composition and content of cracking products was performed on gas chromatography. The preparation of Ni/PG catalyst was employed by incipient impregnation and the preparation program included drying, calcination, hydrogen reduction, and then we can obtain the different content of Ni/PG catalysts. The structural characteristics and phase characteristics in prepared catalysts were measured by a combination of TEM, XRD, SEM, TPD, TPO. The impacts of reaction temperature, amount of Ni and amount of CO₂ on toluene conversion, H₂ yield, CO yield, the amount and phase of carbon deposit were analyzed on temperature controlling stove. The results showed that toluene can be caused to crack on PG in some extent, while Ni/PG could improve the conversion of toluene significantly. The toluene conversion increased with the higher reaction temperature, the amount of Ni increased and also increased with the amount of CO₂ and the space velocity increased within a certain range. The H₂ yield decreased with reaction temperature and amount of CO₂ increased, and the amount of Ni almost has no influence on H₂ yield. When the amount of Ni was 2% and 8%, the H₂ yield of NiO was higher than Ni. In contrast, the H₂ yield of Ni was higher than NiO when the amount of Ni was 5%. The reaction temperature almost has no influence on CO yield, but the CO yield increased with amount of CO₂ and Ni increased. The amount of carbon deposit decreased with amount of CO₂, Ni and reaction temperature increased. The amount of CO₂, Ni and reaction temperature had no influence on phase of carbon deposit and the peak intensity of carbon deposit decreased with amount of CO₂, Ni and reaction temperature increased. In inert atmosphere, the peak intensity increased with amount of Ni increased.