 Fast pyrolysis of poplar wood was followed with catalytic cracking of the vapors. The catalysis by Chow significantly reduced the levels of phenols and anhydrosigars, and eliminated the acids, while it increased the formation of cyclopentanones, hydrocarbons, and several light compounds. The other four catalysts decreased the linear aldehydes dramatically, while they increased the ketones and ketones. This article was authored by Chang Lu, Ji Feizhuang, Shi Fengzhu, and others.