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首页> 外文会议>AIChE Annual Meeting >HIGH-PRESSURE, HIGH-TEMPERATURE PERMEANCE MEASUREMENTS OF PALLADIUM-COPPER ALLOYS
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HIGH-PRESSURE, HIGH-TEMPERATURE PERMEANCE MEASUREMENTS OF PALLADIUM-COPPER ALLOYS

机译：钯 - 铜合金的高压，高温渗透测量

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The hydrogen permeance of various palladium-copper alloy membranes (0, 40, 53, 60, 80, and 100wt% palladium) has been determined using feed gas mixtures both with and without H{sub}2S present. The membrane samples were composed of thin metal foils (-100 microns) supported on high nickel alloy porous substrates, and studied at temperatures and pressures up to 1173 K and 2.6 kPa, respectively. Results of the study indicate that the crystalline phase (bcc vs fcc) of a particular alloy composition, induced by temperature has a significant impact on the resulting permeability, both with and without H{sub}2S present. All of the membranes studied exhibited infinite selectivity, with the pure palladium membrane exhibiting the highest permeability of the membranes studied in a hydrogen atmosphere. The permeability of the palladium membrane can be expressed in Arrhenius form yielding a pre-exponential constant and activation energy of permeation of 1.13×10{sup}(-3)[mol m{sup}(-1) s{sup}(-1) Pa{sup}(-0.5)] and 12.97 [J mol{sup}(-1) K{sup}(-1)], respectively, or fluxes as high as 62 cm{sup}3 cm{sup}2 min{sup}(-1). The 60wt% palladium-copper alloy exhibited the highest permeance of the alloys tested in a hydrogen atmosphere at temperatures below 773 K, while the highest permeance achieved above 773 K was by the 80 wt% palladium-copper alloy. The difference in the maxima can be directly attributed to the temperature-induced bcc and fcc crystalline phases of the alloys. The permeance behavior of the palladium-copper alloy membranes exposed to 1000 ppm H{sub}2S was found to correlate to the alloy crystal structure. Sulfur poisoning resistance was exhibited for the alloys at temperatures corresponding to their fcc crystalline phase but there was a significant decrease in permeance when exposed to H{sub}2S under bcc stability conditions.
机译：各种钯 - 铜合金膜的氢渗透率（0，40，53，60，80，和100重量％的钯）已被使用的进料气体混合物具有和不ħ{子} 2S本确定。将膜样品由负载在高镍合金的多孔基材薄金属箔（-100微米）的，并在温度和压力分别达到1173 K和2.6千帕，研究。该研究的结果表明，特定的合金组成中的结晶相（BCC VS FCC），由温度引起的对所得到的磁导率的影响显著，具有和不ħ{子} 2S本。所有的膜所研究显示出无限的选择性，与纯钯膜表现出在氢气气氛中研究了膜的最高渗透性。钯膜的渗透率可以在阿仑尼乌斯形式表达产生1.13×10 {SUP}的渗透的预指数常数和活化能（ - 3）[摩尔米{SUP}（ - 1）■{SUP}（ - 1）霸{SUP}（ - 0.5）〕和12.97 [J摩尔{SUP}（ - 1）K {SUP}（ - 1）]，分别或通量高达62厘米{SUP}3厘米{SUP} 2分钟{SUP}（ - 1）。的60wt％的钯 - 铜合金表现出在温度低于773 K的氢气氛中测试的合金的最高渗透性，而最高的渗透性达到上述773钾含量由80重量％的钯 - 铜合金。在最大值的差，可直接归因于合金的温度引起的BCC和FCC结晶相。暴露至1000ppmħ{子} 2S钯 - 铜合金膜的渗透行为被发现关联到合金晶体结构。耐硫中毒性在对应于它们的面心立方晶相的温度下表现出的合金，但是当BCC稳定性条件下暴露至H {}子2S有在渗透性一个显著降低。

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