合成钻石助力改变全球变暖

实验室合成钻石 2019-06-14 14:41:48

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合成钻石助力改变全球变暖

 

随着全球变暖,气候问题现在是全球共同关注和急需解决的问题。欧洲研究人员正在研究降低大气中二氧化碳浓度的新方法。如果成功,他们的实验成果将有助于应对气候变化,为某些工业分支提供更可持续的原材料供应。



他们的目标是从水中或其他绿色溶剂中借助阳光处理的二氧化碳生产有用的化学物质。所得物质可用于燃料,或者其它工业化合物如甲醇,甲酸或甲烷,以减少对石油或天然气的依赖。


德国维尔茨堡的Julius-Maximilians大学有机化学研究所的Anke Krueger说:“这将有助于减少石油资源的使用,并循环利用二氧化碳。这一过程的关键是人工合成钻石。当合成金刚石中的电子在化学反应中被激发时,高浓度的能量将二氧化碳转化为精细化学品。”




该解决方案可以看作是植物光合作用的人造替代品,将二氧化碳重新引入生化周期,只是其中的光催化体系是不同的。


实验室实验中所需的成分是溶剂介质,合成金刚石,活性物质和二氧化碳。光用于激发合成金刚石中的电子,从而引发与二氧化碳的反应。 Krueger说:“我们不会在这个过程中使用危险的物质,我们使用水或离子液体作为溶剂,而金刚石材料本身并不具有毒性,二氧化碳是广泛存在的污染物,所以从空气中去除是有益的。



“如果这项技术被大规模使用,也可以减少温室气体的影响,目前我们正处于实验室规模,因此二氧化碳消费量非常低,但目标是使用二氧化碳来生产出有用的物质。如果有可能产生有用的东西,” Krueger 解释并强调,“科学团队暂时不针对大气中的其他有毒气体。”


预计到2019年中期,项目结束时,一个示范实验室装置将准备生产二氧化碳基本物质的C1构建块,来表明整个过程运行正常,并能够收集稳定性数据。之后,大型企业也可以加入,改进技术实现在工业上大规模使用。



随着CVD合成技术的提高,洛阳誉芯金刚石通过采用气体原料(氢气、甲烷)在低于1个气压,800-1200℃的温度下采用外延生长的方式获得完全透明无色大尺寸金刚石单晶,其成分、硬度、密度等与天然钻石基本一致,而价格远远低于天然钻石;与高温高压法(HTHP)不同,CVD人工成合技术不需要使用催化剂,杜绝了生产中形成的金属夹杂、裂隙、孔洞等。

特点:打磨后的净度一般为VVS及以上级别,色度为D-J色。

可提供克拉级的钻石原胚。



Fuel from Diamonds? 

European Researchers are Investigating New Approaches

 

European researchers are investigating new approaches to decrease the concentration of carbon dioxide in the atmosphere, with a view to exploiting them. If successful, their experimental technology will help fight climate change and provide a more sustainable supply of raw materials for certain industrial branches.


They aim to produce useful chemicals from the carbon dioxide treated in water or in other green solvents with the aid of sunlight. The resulting substances could be used for fuel, or to obtain other industrial compounds such as methanol, formic acid or methane to reduce reliance on petroleum or natural gas.



"That would help use less fossil sources and recycle carbon dioxide, closing the circle," says Anke Krueger from the Institute for Organic Chemistry of Julius-Maximilians University in Wuerzburg, Germany. Key to the process are synthetic diamonds. When the electrons in synthetic diamonds are excited during a chemical reaction, high levels of energy transform CO2 into fine chemicals.



This solution can be seen as a man-made alternative to the photosynthesis of plants, which reintroduces carbon dioxide into the biochemical cycle. Only the photocatalytic system is different.


The ingredients needed in the lab experiment are a solvent medium, synthetic diamond, the active material, and carbon dioxide. Light is used to excite electrons in the diamond, sparking a reaction with carbon dioxide. None of the compounds that go into this reaction are detrimental to the environment, Krueger says, "We don't use dangerous materials for this process, we use water or ionic liquids for the solvent. And diamond material itself is not toxic. The carbon dioxide is a widespread pollutant, so removing that from air is beneficial, rather than problematic.



"If this technology is utilised on a large-scale, greenhouse gas effects can also be reduced. At the moment, we are at the laboratory scale, so carbon dioxide consumption is very low, but the goal is to use as much carbon dioxide as possible to produce something useful out if it," explains Krueger. She emphasized that the scientific team is not targeting other toxic gases in the atmosphere for the time being.


By the end of the project in mid-2019, a demonstrator lab device will be ready to produce C1 building blocks, which are basic substances from CO2, to show that the whole process is running properly and to allow the collection of the stability data. Later, large enterprises could be involved, and a technologically more advanced demonstrator could be used at the industrial scale.

 


With the improvement of CVD synthesis technology, through the adoption of gas raw material (hydrogen, methane), Luoyang Yuxin Diamond Co.,Ltd get the completely transparent and colorless large size diamond single crystal under less than one air pressure, the temperature of 800-1200 ℃ by epitaxial growth way (growth way/as shown in Figure 1), its composition, hardness, density, etc. are basically identical with natural diamond, but the price is much lower than that of natural diamond; different from the method of high temperature and high pressure (HTHP), CVD artificial synthetic technique does not need to use the catalyst, and puts an end to forming metal inclusions, cracks, holes, etc. in the production.

Features: after polishing, the clarity is commonly VVS and above level, color chromaticity of D-J.

We can provide raw diamond at carat level.





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