面向催化剂快速表征的串联微反应器系统设计

摘要

The design of a tandem micro-reactor was discussed.A tandem micro-reactor consists of two reactors (upper and lower),which is individually temperature-controlled.The upper reactor (1 st reactor)is used to preheat a gas,vaporize a liquid,or thermally decompose (i.e.pyrolyze)organic solids in order to form a vapor phase sample.The catalyst reaction tube is packed with a catalyst and placed in the lower reactor (2nd reactor). Vapors from the 1 st reactor flow into the reaction tube in the lower reactor,where they react with the catalyst.A mass flow controller allows selection of one to three reactant gases that can be introduced to the sample vapors exiting the upper reactor prior to entering the lower reactor containing the catalyst bed.The reaction products exiting the lower reactor flow directly into the gas chromatograph for analysis.The catalyst is evaluated by noting what compounds are formed and their relative distribution using mass spectrometer detection.The transformation of cellulose,glycerol,and Jatropha "press cake"illustrates the value and convenience of using the tandem micro reactor to rapidly characterize a catalyst or a series of catalysts.%探讨了一种串联微反应器的设计。此串联微反应器由上下2层各自可以实现独立温控的微反应器组成。上层微反应器（微反应器1）用于预热气体、蒸发液体或使有机固体热分解形成一个气相样品。装满催化剂的催化剂反应管放置于下层微反应器（微反应器2）。气化物从上层微反应器流入下层微反应器的反应管，与其中催化剂进行反应。质量流量控制器控制1／3上层微反应器流出的反应气化物作为气相样品，进入下层微反应器催化剂床。从下层微反应器流出反应产物直接进入气相色谱仪进行分析。通过质谱检测评估催化剂的化合物组成及相对分布。通过对纤维素、甘油和麻风树“压饼”的转化，说明了此串联微反应器快速表征一种催化剂或一系列的催化剂的便捷和价值。