Two-step pyrolysis (TSP) combined with catalyst was proposed to explore a new effective method of biomass utilization. The pyrolysis behavior and TSP characteristic of rice husk (RH) and RH impregnated with zinc acetate (ZnRH) were investigated by TG (thermogravimetric analyzer) and Py-GC/MS (pyrolysis-gas chromatography/mass spectrometry). The effects of zinc acetate on the pyrolysis kinetics and product distribution were studied. The results showed that the TG process of RH and ZnRH could be both divided into three stages, and zinc acetate decreased the activation energy of pyrolysis process. The kinetic analysis using Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods indicated that the pyrolysis reactions of RH and ZnRH corresponded to one-dimensional shrinking core model (R1). The impregnation of zinc acetate inhibited ring-opening and cleavage reactions and promoted dehydration and cyclization reactions of TSP. Therefore, compared with TSP of RH, ZnRH had higher selectivity of acids and furans in the first step, and obviously higher selectivity of furans and anhydrosugars in the second step. Moreover, the yield of phenols was decreased in TSP of RH by impregnating zinc acetate.

提出了结合催化剂的两步热解法，以探索一种有效的生物质利用新方法。通过TG（热重分析仪）和Py-GC / MS（热解气相色谱/质谱）研究了稻壳（RH）和浸有乙酸锌（ZnRH）的RH的热解行为和TSP特性。研究了乙酸锌对热解动力学和产物分布的影响。结果表明，RH和ZnRH的TG过程可分为三个阶段，乙酸锌降低了热解过程的活化能。使用Flynn-Wall-Ozawa（FWO）和Kissinger-Akahira-Sunose（KAS）方法进行的动力学分析表明，RH和ZnRH的热解反应对应于一维收缩核模型（R1）。乙酸锌的浸渍抑制了TSP的开环和裂解反应，并促进了TSP的脱水和环化反应。因此，与RH的TSP相比，ZnRH在第一步对酸和呋喃的选择性更高，而在第二步对呋喃和脱水糖的选择性明显更高。此外，通过浸渍乙酸锌，在RH的TSP中酚的产率降低。