Catalytic pyrolysis of lignin using a two-stage fixed bed reactorcomprised of in-situ natural zeolite and ex-situ HZSM-5 = 복합 제올라이트로 구성된 2단 고정반응기에서의 리그닌 촉매 열분해

Abstract

The two-stage catalytic pyrolysis of lignin over in-situ natural zeolite (NZ) and ex-situ HZSM-5 was exam-ined using a tandem fixed bed reactor. The physicochemical properties of the catalysts, HZSM-5 and NZ,were characterized by N2adsorption-desorption and temperature programed desorption of ammonia.The overall performance for the catalytic pyrolysis of lignin was evaluated by the comparing lignin con-version, aromatic formation, and amount of coke deposited from the two-stage catalytic pyrolysis withthose from a single-stage catalytic pyrolysis with ex-situ HZSM-5. Compared to the single-stage catalyticpyrolysis, the two-stage catalytic pyrolysis produced a larger amount of aromatics with a smaller amountof coke due to the pre-catalytic effect of NZ. These positive effects caused by the use of the two-stagecatalyst were maximized by increasing the amounts of in-situ natural zeolite and the temperature of theex-situ HZSM-5 catalyst bed to 600？C.