we can be fix the fast pyrolsis by three important parameters:

(1) fast heating rates

(2) high catalyst to feed ratios, and

(3) proper catalyst selection (both active site and pore

structure

you can see the Overview of Applications of Biomass Fast Pyrolysis Oil at the following link

http://pubs.acs.org/doi/abs/10.1021/ef034067u

also see

http://onlinelibrary.wiley.com/doi/10.1002/bbb.205/full

http://www.sciencedirect.com/science/article/pii/S0961953411000638

and follow attached

Hi,

The choice on how to fix your catalyst depends on the contact mode of the catalyst:

(1) the catalyst contact directly with the reactant-you can just mix them together, and any substance/intermediates released from the reactant (polymer, biomass etc) react directly on the catalyst. However, it is difficult to recover the catalyst after the reaction. 

(2) the catalyst is located near to the reactant, but isolated from the reactant- the location of the catalyst depend on your judgement, and the idea is: after the substances/intermediates are released by the reactant, they pass through the catalyst and undergo catalyzed reactions, before being collected or condensed. By using this method and proper placement of catalyst, whole amount of catalyst can be recovered after reaction for characterization and regeneration purposes. 

Please refer to the paper below for the example to fix the catalyst on the wire mesh:

https://www.researchgate.net/publication/295245310_Catalytic_Cracking_of_LDPE_Dissolved_in_Benzene_Using_Nickel-Impregnated_Zeolites

Article Catalytic Cracking of LDPE Dissolved in Benzene Using Nickel...

yes i agree with Wong Syie Luing suggestion try it and check the results thanks