水稻大学实验室改善了其方法将普通沥青变成了一种可以从天然气捕获温室气体的多孔材料。
在本月份的研究中详细说明Advanced Energy Materials米饭研究人员表明，在气体井口的高压下，新形式的材料可以在二氧化碳中隔离其中的154％的重量。
Raw natural gas typically contains between 2 and 10 percent carbon dioxide and other impurities, which must be removed before the gas can be sold. The cleanup process is complicated and expensive and most often involves flowing the gas through fluids called amines that can soak up and remove about 15 percent of their own weight in carbon dioxide. The amine process also requires a great deal of energy to recycle the fluids for further use.
“It’s a big energy sink,” said Rice chemist James Tour, whose lab developed a technique last year to turn asphalt into a tough, sponge-like substance that could be used in place of amines to remove carbon dioxide from natural gas as it was pumped from ocean wellheads.
2015年的初始现场测试发现井口的压力使得沥青材料在环境温度下吸附或浸泡114％的碳重量。
巡回赛说，新的，改进的沥青吸附剂在两步之外，从不那么昂贵的沥青形式制作，这使得工业更加实用。
“这表明我们可以采取最便宜的沥青形式，使其进入这一非常高的表面积材料以捕获二氧化碳，”巡回赛说。“之前，我们只能使用一种非常昂贵的沥青形式，这些沥青不容易获得。”
实验室加热常见沥青称为吉尔onite at ambient pressure to eliminate unneeded organic molecules, and then heated it again in the presence of potassium hydroxide for about 20 minutes to synthesize oxygen-enhanced porous carbon with a surface area of 4,200 square meters per gram, much higher than that of the previous material.
The Rice lab’s initial asphalt-based porous carbon collected carbon dioxide from gas streams under pressure at the wellhead and released it when the pressure was released. The carbon dioxide could then be repurposed or pumped back underground while the porous carbon could be reused immediately.
In the latest tests with its new material, Tours group showed its new sorbent could remove carbon dioxide at 54 bar pressure. One bar is roughly equal to atmospheric pressure at sea level, and the 54 bar measure in the latest experiments is characteristic of the pressure levels typically found at natural gas wellheads, Tour said.
提起：Industrial automation
