Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7048679 | Applied Thermal Engineering | 2016 | 20 Pages |
Abstract
Adoption of biomass gasification-based power generating systems for meeting the power requirements of decentralised habitations on kW scale is not only a proven option but is also regarded as an environmentally benign approach. One of the persisting issue still to be resolved in biomass gasifiers is the formation of tar along with the producer gas. Tar is regarded as highly carcinogenic and is observed to condense at room temperature, thereby blocking and fouling the downstream equipment's. Among the tar mitigation methods, catalytic tar mitigation method is highly effective, and majority of the studies have been conducted with bulk catalysts, which suffer due to inherent disadvantages. Hence it has been proposed to experimentally analyse the impact of nano catalytic-based tar reduction to overcome the said drawbacks. The objective of this study is to evaluate the effectiveness of a novel low-cost, eco-friendly bimetallic nano structured Ni-Co/Si-P catalyst for tar removal in a downdraft 15âkWth biomass gasifier. The nano catalyst was synthesised by deposition-precipitation method. Characterisation of the catalyst has been accomplished using XRD, HR-SEM, HR-TEM, BET and TGA analysis. Using XRD pattern the mean size of nano crystallite particles has been observed in the range of 10ânm. HR-SEM and HR-TEM measurements concur with this value. BET analysis using N2 sorption studies revealed the surface area as128âm2 gâ1. TGA studies confirmed that the catalyst was thermally stable up to 900â°C. The gas generated from the gasifier was made to pass through a catalytic tar cracking unit comprising Ni-Co/Si-P nano catalyst. Experimentation with the nano catalyst resulted in a tar cracking of 99% as compared to 91.5% from bulk mode. Hence it has been conjectured that nano Ni-Co/Si-P catalyst is capable of mitigating the tar generated in biomass gasification systems substantially.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Shanmuganandam Kannaiyan, Venkata Ramanan Madhavan, Saravanan Rajagopal, Anichai Jayabalan,