Catalytic pyrolysis of waste rice husk over mesoporous materials

Abstract

Catalytic fast pyrolysis of waste rice husk was carried out using pyrolysis-gas chromatography/mass spectrometry [Py-GC/MS]. Meso-MFI zeolite [Meso-MFI] was used as the catalyst. In addition, a 0.5-wt.% platinum [Pt] was ion-exchanged into Meso-MFI to examine the effect of Pt addition. Using a catalytic upgrading method, the activities of the catalysts were evaluated in terms of product composition and deoxygenation. The structure and acid site characteristics of the catalysts were analyzed by Brunauer-Emmett-Teller surface area measurement and NH3 temperature-programmed desorption analysis. Catalytic upgrading reduced the amount of oxygenates in the product vapor due to the cracking reaction of the catalysts. Levoglucosan, a polymeric oxygenate species, was completely decomposed without being detected. While the amount of heavy phenols was reduced by catalytic upgrading, the amount of light phenols was increased because of the catalytic cracking of heavy phenols into light phenols and aromatics. The amount of aromatics increased remarkably as a result of catalytic upgrading, which is attributed to the strong Brönsted acid sites and the shape selectivity of the Meso-MFI catalyst. The addition of Pt made the Meso-MFI catalyst even more active in deoxygenation and in the production of aromatics.

The effect of sodium chloride on the pyrolysis of rice husk

“…Therefore, the catalytic pyrolysis of rice husk with NaCl provided improvement in the quality of bio-oils with decreasing the acid value and increasing the heating value. Similar results were showed from the study on catalytic pyrolysis of rice husk for bio-oil production by ZSM-5, Al-MCM-41, Al-MSU-F and rice husk ash catalyst [20].…”

“…It was observed that the catalysts increased the heating value and water content of the bio-oils, whilst viscosity, density and acid number were decreased. Jeon [20] studied catalytic pyrolysis of waste rice husk over mesoporous materials, and the yield of catalytic pyrolysis bio-oil was decreased, but levoglucosan was completely decomposed without being detected in the bio-oils, and the amount of aromatics increased remarkably. These studies always discussed catalytic pyrolysis of rice husk with molecular sieve based catalysts and commercial catalysts, and extensive research has been conducted to understand the effect of these catalysts on the thermal decomposition of biomass for elucidating reaction mechanisms [21][22][23].…”

Pyrolytic–deoxygenation of triglyceride via natural waste shell derived Ca(OH) 2 nanocatalyst

“…1 and eq. 2) [24][25][26]. In order to confirm the reproducibility of the results, the experiments were conducted for three times, with the average of the peak area and peak area % was calculated.…”

Catalytic pyrolysis of rice husk for bio-oil production

“…In an earlier work, William and Nugranad studied the catalytic pyrolysis of rice husk with zeolite ZSM-5 [16]. In a more recent work, Jeon et al, studied catalytic pyrolysis of waste rice husk over mesoporous materials [28] while Zhong et al, investigated the influence of red brick on fast pyrolysis of rice residue (husk and straw) in a fluidised bed reactor [22].…”