Gas-Phase Ion Exchange into Zeolites: A Proposed Set-Up Design
Keywords:apparatus design, ion exchange, sublimation, zeolite, furnace
The aqueous and solid-state ionic exchanges are widely used for introducing chromium ions into ZSM-5 zeolite (Si/2Al = 30 and 50). However, along with their benefits, these exchange methods presented some disadvantages, essentially related to the wasted chemicals. As alternative, we investigated the exchange of Cr and Mo ions into ZSM-5 zeolite by conventional sublimation. Unfortunately, this method exhibited many constraints which were essentially related to the discrepancy between the exchange and the sublimation temperature values (Texch and Tsub, respectively). In this work, we proposed a general design of an experimental set-up required for introducing metallic ions into zeolites regardless Texch and Tsub values. Technically, the implementation of the proposed set-up requires two tubular furnaces, two temperature regulators and a linear reactor.