قالب وردپرس درنا توس
Home / Science / With the right catalyst, we may make jet fuel from carbon dioxide

With the right catalyst, we may make jet fuel from carbon dioxide



With the right catalyst, we may make jet fuel from carbon dioxide

Atmospheric CO absorption technology2 And convert it into fuel, providing a more environmentally friendly option than developing fossil fuels, which may release carbon dioxide2 It re-empties into the air when it burns, but there is no net change.This includes biofuel crops, but can be extended to industrial processes that directly involve carbon dioxide2.As a process of capturing CO2 The carbon dioxide obtained from the ambient air becomes more economical, so the potential value of the carbon dioxide will increase2 As a fuel resource.

There are several ways to produce fuel, but all methods require a lot of energy because carbon dioxide2 Is a stable molecule-the reverse combustion reaction to make new fuel is not free.But there is another challenge: the design is adjusted to produce a precise process Types of The fuel you want.

One way to do this is to use a catalyst-a substance that guides a chemical reaction without being consumed by it. With the help of a catalyst, CO is captured2 Hydrogen may be converted primarily to methane; different catalysts may transfer the main product to larger liquid fuel molecules.

A new study led by Benzhen Yao of the University of Oxford describes a new type of catalyst specifically designed to promote the production of long-chain hydrocarbons for jet fuel.

digital

The catalyst is made of iron, manganese and potassium, which is not surprising. In the test, only 5% converted CO2 Eventually it is produced in the form of carbon monoxide, 1

0% of the gas is produced in the form of methane, and nearly half becomes long-chain hydrocarbons (8-16 carbons) in the jet fuel range. Compared to other catalysts tested in previous studies, the yield in the jet fuel range is much better. Among the 2-4 kinds of hydrocarbons produced, Olefin over Alkanes, Which means more carbon-carbon bonds and fewer carbon-hydrogen bonds. For example, the propylene produced by this reaction is five times that of propane. These are useful raw materials, such as plastics.

The catalyst provides a place for the reaction, thereby affecting the product. Here, this mainly occurs with iron-carbon minerals that convert iron oxides into iron oxides.One form helps carbon monoxide2 Molecules react with hydrogen, while the other helps the carbon monoxide molecules produced react with hydrogen to form hydrocarbons.

The basic chemistry of the work here.
enlarge / Basic chemistry is at work here.

Facts have proved that the method of preparing the catalyst is very important. Mix the materials with organic compounds and then burn them while keeping all materials at 350°C for several hours. The combustion reaction helps iron, manganese, and potassium form the right minerals and leave some carbon behind. Experiments conducted with similar catalyst materials manufactured in different ways have much worse results.

reset

Although the catalyst is not consumed during use, it does change, which means it may have to be regenerated at some point. As before the first use, it can be carried out at high temperature in the presence of hydrogen and carbon monoxide to reform the mineral form in the catalyst.

As part of the real system, this will connect to the CO2 The trapping device and electrolysis device decompose water into hydrogen. The product can then be separated and processed as needed.

Obviously, the research only involves understanding which catalyst is used, and there is no economic analysis of fuel production operations. There is a lot of energy input in this process, especially compared to traditional oil production.However, although petroleum-based fuels increase CO2 emissions2 In the atmosphere, air-based fuels are added in small amounts (or not at all), depending on where the energy required comes from. Moreover, you can also choose to tailor the type of hydrocarbons you make, not just dealing with any hydrocarbons produced underground.

Nature Communications, 2020. DOI: 10.1038 / s41467-020-20214-z (about DOI).


Source link