Current position >About Us
1. The English explanation and research history of artificial nitrogen fixation
In English, I think it should be artificial nitrogen fixation or human fixed nitrogen. The former means artificial nitrogen fixation, while the latter refers to nitrogen fixed artificially. Hehe, it sounds awkward. Related articles can be found below:
1. In the artificial nitrogen fixation industry, H2 and N2 are commonly used to synthesize ammonia under catalyst, high temperature, and high pressure. Recently, two Greek chemists, George Marnellos and Michael Stokides from Aristotelian University in Thessaloniki, invented a new method for synthesizing ammonia (Science, 2 Act.1998, P98). Under normal pressure, hydrogen and nitrogen diluted with helium were separately introduced into an electrolytic cell heated to 570 ℃ using strontium cerium yttrium perovskite porous ceramic (SCY) as the solid electrolyte. The conversion to ammonia was achieved with a conversion rate of 78% using a porous palladium polycrystalline film covering the inner and outer surfaces of the solid electrolyte; Comparison: The Haber method for synthesizing ammonia, which has been around for almost a century, typically has a conversion rate of 10 to 15%! They used online gas chromatography to detect the gas entering and leaving the electrolytic cell, and estimated the yield of ammonia by using HCl to absorb the pH change caused by ammonia. They confirmed that increasing the nitrogen partial pressure was ineffective in improving the conversion rate; Although increasing the current and temperature increases the transfer speed of protons in SCY, the conductivity of SCY is limited by temperature, and increasing the temperature actually accelerates the decomposition of ammonia.
2、 Natural nitrogen fixing lightning can convert nitrogen in the air into nitric oxide, and a single lightning can generate 80-1500kg of nitric oxide. This is also a form of natural nitrogen fixation. Natural nitrogen fixation is far from meeting the needs of agricultural production. Leguminous plants parasitize rhizobia, which contain nitrogenase that can convert nitrogen in the air into ammonia and further into nitrogen compounds. The function of nitrogenase can be summarized as follows: In addition to rhizobia in leguminous plants, nitrogenase is also present in the roots of grasses and other grasses, as well as in some lower prokaryotic plants such as nitrogen fixing cyanobacteria and autotrophic nitrogen fixing bacteria. These enzymes have nitrogen fixing properties. This type of biological nitrogen fixation belongs to natural nitrogen fixation.
2. What does ln mean?
means natural logarithm (Napierian Logarithm); Liquid Nitrogen. The phrase ln Love Alone refers to the era of love; Rat LN rat laminin mouse LN mouse laminin during romantic period; Both types of links can be made with the command ln. Both types of links can be created using the command ln.
3. Understand the usage of namely, i.e., e.g., such as, for example, like at once
The usage of namely, i.e., e.g., such as, for example, like 1. namely (i.e., is) function: It means to list all the content mentioned earlier, emphasizing that the content mentioned is all or specific. Usage: It is usually separated by commas in the beginning and directly followed by the listed content. "namely" cannot be used (i.e. commas cannot be used directly after "namely"). Example Only one person can do the job, namely you.Th