Title:
In Situ Catalytic Upgrading of Rice Husk Pyrolysis Oil over MCM-22 and its Delaminated Counterpart: Effect of Catalyst Physical Configuration on its Performance
Author(s):
Naqvi, S.R., Uemura, Y., Osman, N., Sugiura, Y., Nishiyama, N.
Document(s):
Paper
Slide presentation
Abstract:
Non-catalytic and catalytic fast pyrolysis of rice husk was performed with a medium pore framework zeolite (MCM-22) and its delaminated counterpart with a higher external surface area (ITQ-2) using a lab scale fixed-bed reactor. This work investigates the influence of the catalyst physical structure on the yields of gas, liquid and solid products and gas composition. Firstly, non-catalytic pyrolysis experiments were carried out at various temperatures between 350 to 600 °C. The maximum pyrolysis oil yield of 34.8 % (water 15.1 %, organics 19.7 %) was obtained at 450 °C. At this temperature, catalytic pyrolysis was carried out using MCM-22 and ITQ-2. A mixture of 10 grams of rice husk and a prescribed amount of catalyst (0.5, 1 or 5 g) was used for catalytic pyrolysis. The pyrolysis process resulted in solid, liquid and gas products. By using catalysts, the pyrolysis oil yield decreases. This decrease in pyrolysis oil yield is attributed to catalytic cracking of pyrolysis oil vapor on the catalyst. The major reaction of this cracking was identified to be decarbonylation and decarboxylation. By comparing the result of MCM-22 with ITQ-2, ITQ-2 resulted in slightly higher pyrolysis oil yield than those of MCM-22. This may be attributed to ITQ-2’s thinner delaminated structure compared to MCM-22. This delaminated structure makes the reactants (molecules of pyrolysis oil) more accessible to the catalytic sites, and let the products (upgraded molecules generated from pyrolysis oil) leave from the catalytic sites to the bulk faster. This faster transport from the catalytic site to the bulk decreases the secondary cracking to form gases, hence increases the pyrolysis oil yield.
Keywords:
fast pyrolysis, pyrolysis oil, rice husk, MCM-22, ITQ-2
Topic:
Biomass Conversion Technologies for Intermediates, Liquid and Gaseous Fuels, Chemicals and Materials
Subtopic:
Pyrolysis and other biomass liquefaction technologies
Event:
22nd European Biomass Conference and Exhibition
Session:
3DO.2.4
Pages:
965 - 968
ISBN:
978-88-89407-52-3
Paper DOI:
10.5071/22ndEUBCE2014-3DO.2.4
Price:
FREE
