Abstract
ELP (Electroless Plating), one of the membrane preparation techniques, stands out because of the usage of simple equipments, inexpensive and easy implementation. In this study, the effect of plating bath compositions on the structure of Pd-Ag composite membrane prepared by ELP technique was investigated. Experimental studies were carried out with two different Pd/Ag mass ratios of plating baths. PdCl2, AgCl2, Na2EDTA, N2H4, NH4OH and distilled water were used in plating bath. Plating studies were carried out in the pH range of 10-11 and at 35°C. The highest mass gain was determined at the second plating step for the membrane synthesized in bath with Pd/Ag ratio of "2" while it was determined at the first step for the membrane synthesized in plating bath with Pd/Ag ratio of “6”. Branched crystalline formations on the surface of the membrane synthesized in bath with Pd/Ag ratio of “6” were explained by the difference in the rates of plating Pd and Ag metals. 19% (by mass) of Pd was determined on layer of the membrane synthesized in bath with Pd/Ag ratio of "2", this value increased up to about 61% for the membrane synthesized in bath with Pd/Ag mass ratio of “6”. It was predicted that Pd and Ag distributed more uniformly on the surface of the membrane synthesized in bath with Pd/Ag mass ratio of “6”. It was shown that increasing the total amount of metal by keeping Pd/Ag ratios constant did not affect the composition and the structure of the membranes. Pd/Ag ratio was shown to be important parameter
References
- Altınışık, Ö., Doğan, M. and Doğu, G. (2005). Preparation and Characterization of Palladium Plated Porous Glass for Hydrogen Enrichment, Catalysis Today 105, 641-646.
- Alvar, E.N., Golmohammadi, M.R., Razaei, M., Alvar, H.N., Mardanloo, A., Nouhian, S.H. and Didari, M. (2008). Preparation and Thermal Treatment of Pd/Ag Composite Membrane on A Porous Α- Alumina Tube by Sequential Electroless Plating Techique for H2 Separation, Journal of Natural Gas Chemistry 17, 321-327.
- Braun, F., Tarniti, A. M. and Cornaglia, L. M. (2011). Optimization and Characterization of Electroless Co-deposited Pd-Ru Membranes: Effect of The Plating Variables on Morphology, Journal of Membrane Science 382, 252-261.
- Cheng Y.S. and Yeung K.L. (2001). Effects of Electoless Plating Chemistry on The Synthesis of Palladium Membranes, Journal of Membrane Science 182, 193-203.
- Dogan, M. and Kilicarslan, S. (2008). Effects of Process Parameters on The Synthesis of Palladium Membranes, Beam Interactions with Materials & Atoms 266, 3458-3466.
- Lim, H., Oyama, S.T. (2011). Hydrogen Selective Thin Palladium-Copper Composite Membranes on Alumina Supports, Journal of Membrane Science 378, 179-185.
- Ryi, S. and Li, A. (2011). Ru/Pd Composite Membrane Fabricated by Electroless Plating for Hydrogen Separation, International Journal of Hydrogen Energy 36, 9335-9340.
- Tanaka, D.A.P, Tanco, A.L., Niwa, S.N., Wakui, Y., Mizukami, F., Namba, T. and Suzuki, T.M. (2005). Preparation of Palladium and Silver Alloy Membrane on A Porous Α- Alumina Tube Via Simultaneous Electroless Plating, Journal of Membrane Science 247, 21-27.
- Zhang, D., Zhou, S., Fan, Y., Xu, N. and He, Y. (2011). Preparation of Dense Pd Composite Membranes on Porous Ti-Al Alloy Supports by Electroless Plating, Journal of Membrane Science, 387-388, 24-29.
Abstract
Membran hazırlama yöntemlerinden ELP(Electroless Plating) tekniği, basit ekipman kullanımı, ucuz ve kolay uygulanması yönleri ile öne çıkmaktadır. Bu çalışmada, ELP tekniği kullanılarak hazırlanan Pd-Ag kompozit membran yapısına kaplama banyosu bileşiminin etkileri araştırılmıştır. İki farklı Pd/Ag kütle oranına sahip kaplama banyosunda çalışmalar yürütülmüştür. Kaplama banyosunda PdCl2, AgCl2, Na2EDTA, N2H4, NH4OH ve saf su kullanılmıştır. Kaplama çalışmaları 35oC ve pH=10-11 aralığında yürütülmüştür. Pd/Ag kütle oranının “2” olduğu kaplama banyosunda ikinci kaplama basamağında, Pd/Ag kütle oranın “6” olduğu kaplama banyosunda ise ilk kaplama basamağında en yüksek kütle kazanım değerleri belirlenmiştir. Pd/Ag kütle oranının “6” olduğu banyoda sentezlenen membran yüzeyindeki kristalik dallanmış oluşumlar Pd ve Ag metallerinin kaplanma hızlarındaki farklılık ile açıklanmıştır. Pd/Ag kütle oranının “2” olduğu kaplama banyosunda sentezlenen membran tabakasında yaklaşık %19 (kütlece) oranında Pd belirlenirken, bu değer kütle oranı “6” olan kaplama banyosu için yaklaşık %61’e yükselmiştir. Kütle oranının “6” olduğu banyoda elde edilen membran yüzeyinde Pd ve Ag’nin daha homojen dağıldığı belirlenmiştir. Kaplama banyosunda Pd/Ag oranı sabit tutularak toplam metal konsantrasyonunun arttırılmasının membran bileşim ve yapısına etkisinin olmadığı, önemli parametrenin Pd/Ag oranı olduğu gösterilmiştir.
References
- Altınışık, Ö., Doğan, M. and Doğu, G. (2005). Preparation and Characterization of Palladium Plated Porous Glass for Hydrogen Enrichment, Catalysis Today 105, 641-646.
- Alvar, E.N., Golmohammadi, M.R., Razaei, M., Alvar, H.N., Mardanloo, A., Nouhian, S.H. and Didari, M. (2008). Preparation and Thermal Treatment of Pd/Ag Composite Membrane on A Porous Α- Alumina Tube by Sequential Electroless Plating Techique for H2 Separation, Journal of Natural Gas Chemistry 17, 321-327.
- Braun, F., Tarniti, A. M. and Cornaglia, L. M. (2011). Optimization and Characterization of Electroless Co-deposited Pd-Ru Membranes: Effect of The Plating Variables on Morphology, Journal of Membrane Science 382, 252-261.
- Cheng Y.S. and Yeung K.L. (2001). Effects of Electoless Plating Chemistry on The Synthesis of Palladium Membranes, Journal of Membrane Science 182, 193-203.
- Dogan, M. and Kilicarslan, S. (2008). Effects of Process Parameters on The Synthesis of Palladium Membranes, Beam Interactions with Materials & Atoms 266, 3458-3466.
- Lim, H., Oyama, S.T. (2011). Hydrogen Selective Thin Palladium-Copper Composite Membranes on Alumina Supports, Journal of Membrane Science 378, 179-185.
- Ryi, S. and Li, A. (2011). Ru/Pd Composite Membrane Fabricated by Electroless Plating for Hydrogen Separation, International Journal of Hydrogen Energy 36, 9335-9340.
- Tanaka, D.A.P, Tanco, A.L., Niwa, S.N., Wakui, Y., Mizukami, F., Namba, T. and Suzuki, T.M. (2005). Preparation of Palladium and Silver Alloy Membrane on A Porous Α- Alumina Tube Via Simultaneous Electroless Plating, Journal of Membrane Science 247, 21-27.
- Zhang, D., Zhou, S., Fan, Y., Xu, N. and He, Y. (2011). Preparation of Dense Pd Composite Membranes on Porous Ti-Al Alloy Supports by Electroless Plating, Journal of Membrane Science, 387-388, 24-29.
Details
| Primary Language | Turkish |
|---|---|
| Journal Section | Articles |
| Authors | |
| Publication Date | November 11, 2015 |
| Published in Issue | Year 2015 Volume: 16 Issue: 2 |
