Skip to main content

Thank you for visiting You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.


Catalyst removes CO2, makes fine chemicals

By varying the temperature of a constant flow of ammonia gas, researchers have synthesized an efficient solid-base catalyst that can absorb carbon dioxide, a greenhouse gas that contributes to global warming1. This catalyst is a silica oxynitride (SBA-15-oxynitride) and is potentially useful in industrial processes for synthesizing fine chemicals and petrochemicals.

Previous studies had attempted to make silica oxynitrides by changing the temperature and adding methyl groups. But, such modifications destroyed the catalysts’ structures and greatly reduced their surface area, rendering them useless as catalysts.

To make an efficient solid-base catalyst, the researchers added amine groups to silica oxynitrides by heating silica oxynitrides to temperatures of 500, 700, 900 and 1,200 degrees Celsius under a flow of ammonia gas (300 millilitres per minute).

The scientists found that the nitrogen content of the silica oxynitrides increased with increasing reaction temperature. However, they observed that an increase in temperature did not necessarily enhance the catalytic activity of the catalyst ― silica oxynitrides synthesized at 700 degrees Celsius showed the highest catalytic activity, surpassing those of catalysts produced at higher temperatures.

“This technique will help researchers to chemically manipulate various active sites in silica oxynitrides, producing highly active, superior solid-base catalysts for various industries,” says lead researcher Vivek Polshettiwar from Tata Institute of Fundamental Research, Mumbai.



  1. Singh, B. et al. Angew. Chem. Int. Ed. 54, 1– 6 (2015)

    PubMed  Article  Google Scholar 

Download references

Nature Careers


Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing


Quick links