Toro Luigi, Moscardini Emanuela, Baldassari Ludovica M, Forte Flavia, Coletta Jacopo, Palo Emma, Cosentino Vittoria, Angelini Fabio, Arratibel Plazaola Alba, Pagnanelli Francesca, Altimari Pietro
Eco Recycling Srl, Via Francesco Siacci, 4, 00197 Rome, Italy.
KT-Kinetics Technology Spa, Viale Castello della Magliana, 27, 00148 Rome, Italy.
Membranes (Basel). 2022 Jul 21;12(7):723. doi: 10.3390/membranes12070723.
The aim of the present work is the recycling treatment of tubular α-AlO-supported ceramic membranes with a Pd/Ag selective layer, employed in hydrogen production with integrated CO capture. A nitric acid leaching treatment was investigated, and recovered ceramic supports were characterized, demonstrating their suitability for the production of novel efficient membranes. The main objective was the metal dissolution that preserved the support integrity in order to allow the recovered membrane to be suitable for a new deposition of the selective layer. The conditions that obtained a satisfactory dissolution rate of the Pd/Ag layer while avoiding the support to be damaged are as follows: nitric acid 3 M, 60 °C and 3.5 h of reaction time. The efficiency of the recovered supports was determined by nitrogen permeance and surface roughness analysis, and the economic figures were analysed to evaluate the convenience of the regeneration process and the advantage of a recycled membrane over a new membrane. The experimentation carried out demonstrates the proposed process feasibility both in terms of recycling and economic results.
本工作的目的是对具有钯/银选择性层的管状α-AlO支撑陶瓷膜进行回收处理，该陶瓷膜用于集成二氧化碳捕集的制氢过程。研究了硝酸浸出处理，并对回收的陶瓷支撑体进行了表征，证明它们适用于生产新型高效膜。主要目标是实现金属溶解，同时保持支撑体的完整性，以便使回收的膜适合选择性层的新沉积。在避免支撑体受损的情况下，获得令人满意的钯/银层溶解速率的条件如下：3M硝酸、60°C和3.5小时的反应时间。通过氮气渗透率和表面粗糙度分析确定回收支撑体的效率，并分析经济数据以评估再生过程的便利性以及回收膜相对于新膜的优势。所进行的实验证明了所提出的工艺在回收和经济结果方面的可行性。
