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Stability of electroless pore-plated Pd-membranes in acetic acid steam membrane-reformers for ultra-pure hydrogen production
Fuel Processing Technology ( IF 7.5 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.fuproc.2020.106619
G. Adduci , D. Martinez-Diaz , D. Sanz-Villanueva , A. Caravella , J.A. Calles , R. Sanz , D. Alique

Abstract Electroless Pore-Plated (ELP-PP) membranes were successfully incorporated for the first time into a membrane reactor to produce hydrogen by acetic acid steam reforming (AASR), exhibiting adequate resistance against harsh operating conditions. Membranes were prepared onto tubular PSS supports modified with Pd/CeO2 particles and scaled-up around four times in length with high reproducibility respect previous studies. H2 permeances from 4.49 to 5.67·10−4 mol m−2 s−1 Pa-0.5 were found for pure H2 at 350–450 °C, decreasing for mixtures due to concentration-polarization at higher pressures but also certain inhibition caused by CO2 at pressures below 50 Pa0.5. The combination of membranes with Ni/SBA-15 catalysts in packed-bed membrane reactors (PBMR) evidenced the simultaneous improvement of acetic acid conversion and hydrogen yield respect to analogous experiments in traditional packed-bed reactors (PBR). A very similar product distribution was obtained for both configurations, PBR and PBMR, when using fresh catalysts, although marked deviations were found in case of regenerating the catalysts. Then, higher selectivity towards coke reached for PBMR, which lead to around 30% for the most elevated pressure under investigation. However, even at these harsh conditions, the mechanical integrity of ELP-PP membranes was maintained. Thus, the benefits of combining catalysts and ELP-PP membranes in a PBMR for AASR were demonstrated.

中文翻译:

用于超纯氢生产的醋酸蒸汽膜重整器中化学镀孔钯膜的稳定性

摘要 化学镀孔 (ELP-PP) 膜首次成功地结合到膜反应器中,通过乙酸蒸汽重整 (AASR) 制氢,对恶劣的操作条件表现出足够的抵抗力。将膜制备在用 Pd/CeO2 颗粒改性的管状 PSS 载体上,并按比例放大了大约四倍的长度,与以前的研究相比具有高重现性。在 350-450 °C 下发现纯 H2 的 H2 渗透率从 4.49 到 5.67·10-4 mol m-2 s-1 Pa-0.5,由于高压下的浓度极化而降低混合物,但也有 CO2 引起的某些抑制在低于 50 Pa0.5 的压力下。膜与 Ni/SBA-15 催化剂在填充床膜反应器 (PBMR) 中的组合证明,相对于传统填充床反应器 (PBR) 中的类似实验,乙酸转化率和氢气产率同时提高。当使用新鲜催化剂时,PBR 和 PBMR 两种配置获得了非常相似的产物分布,尽管在再生催化剂的情况下发现了明显的偏差。然后,PBMR 对焦炭的选择性更高,这导致所研究的最高压力的 30% 左右。然而,即使在这些恶劣条件下,ELP-PP 膜的机械完整性也得以保持。因此,证明了在用于 AASR 的 PBMR 中结合催化剂和 ELP-PP 膜的好处。当使用新鲜催化剂时,PBR 和 PBMR 两种配置获得了非常相似的产物分布,尽管在再生催化剂的情况下发现了明显的偏差。然后,PBMR 对焦炭的选择性更高,这导致所研究的最高压力的 30% 左右。然而,即使在这些恶劣条件下,ELP-PP 膜的机械完整性也得以保持。因此,证明了在用于 AASR 的 PBMR 中结合催化剂和 ELP-PP 膜的好处。当使用新鲜催化剂时,PBR 和 PBMR 两种配置获得了非常相似的产物分布,尽管在再生催化剂的情况下发现了明显的偏差。然后,PBMR 对焦炭的选择性更高,这导致所研究的最高压力的 30% 左右。然而,即使在这些恶劣条件下,ELP-PP 膜的机械完整性也得以保持。因此,证明了在用于 AASR 的 PBMR 中结合催化剂和 ELP-PP 膜的好处。即使在这些恶劣的条件下,ELP-PP 膜的机械完整性也得以保持。因此,证明了在用于 AASR 的 PBMR 中结合催化剂和 ELP-PP 膜的好处。即使在这些恶劣的条件下,ELP-PP 膜的机械完整性也得以保持。因此,证明了在用于 AASR 的 PBMR 中结合催化剂和 ELP-PP 膜的好处。
更新日期:2021-02-01
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