ŠKODA begins production of its first BEV: CITIGOe iV
Volkswagen making Car.Software an independent business unit; investing €7B by 2025

Efficient bottom-up synthesis of new perovskite material for the production of ammonia

Scientists at Tokyo Institute of Technology (Tokyo Tech) have found a way to synthesize a special type of perovskite that promotes the production of ammonia, which has key applications in fertilizer production and hydrogen energy. This new synthesis process can be carried out at temperatures immensely lower than that of traditional methods for the synthesis of perovskite-oxide materials and in much less time, and the produced perovskite outperforms all its competitors for producing ammonia.

A paper describing their work is publish in the Journal of the American Chemical Society.

Perovskites are a class of synthetic materials that have a crystalline structure similar to that of the naturally occurring mineral calcium titanate. They have been the subject of many studies because they exhibit exciting and unique properties that can be tuned according to their composition. One of their potential applications is as catalysts for the synthesis of ammonia.

In other words, specific perovskites can be placed inside a reaction chamber with nitrogen and hydrogen to promote the reaction of these gases to form ammonia.

Ammonia is a useful substance that can be employed in the production of fertilizers and artificial chemicals, and even as a clean-energy carrier (in the form of hydrogen), which may be key in eco-friendly technologies. However, there are various challenges associated with the synthesis of ammonia and perovskites themselves.

The synthesis rate for ammonia is generally limited by the high energy required to dissociate nitrogen molecules. Some researchers have had some success using precious metals, such as ruthenium. Recently, perovskites with some of their oxygen atoms replaced by hydrogen and nitrogen ions have been developed as efficient catalysts for ammonia synthesis. However, the traditional synthesis of perovskites with such substitutions usually has to be carried out at high temperatures (more than 800 ˚C) and over long periods of time (weeks).


Synthesis rates for ammonia of various catalysts

To address these issues, in a recent study carried out at Tokyo Tech, a group of researchers led by Prof. Masaaki Kitano devised a novel method for the low-temperature synthesis of one of such oxygen-substituted perovskites with the chemical name BaCeO3-xNyHz and tested its performance as a catalyst to produce ammonia.

To achieve this, they made an innovative alteration to the perovskite synthesis process. The use of barium carbonate and cerium dioxide as precursors involves a very high temperature to have them combine into the base perovskite, or BaCeO3, because barium carbonate is very stable. In addition, one would then have to substitute the oxygen atoms with nitrogen and hydrogen ions.

The team found that the compound barium amide reacts easily with cerium dioxide under ammonia gas flow to directly form BaCeO3-xNyHz at low temperatures and in less time.

The researchers attempted to elucidate the mechanisms behind the improved synthesis rate for ammonia. Overall, the insight provided in this study serves as a protocol for the synthesis of other types of materials with nitrogen and hydrogen ion substitutions and for the intelligent design of catalysts.


  • Masaaki Kitano, Jun Kujirai, Kiya Ogasawara, Satoru Matsuishi, Tomofumi Tada, Hitoshi Abe, Yasuhiro Niwa, and Hideo Hosono (2019) “Low-Temperature Synthesis of Perovskite Oxynitride-Hydrides as Ammonia Synthesis Catalysts” Journal of the American Chemical Society doi: 10.1021/jacs.9b10726



Still have to make the hydrogen.

The Lurking Jerk

@SJC: Yes, but Ammonia as an energy carrier just got much easier to make, which I read as 'more affordable'. And thats really the whole thing holding up renewable liquid fuels, affordability. Liquid fuels carry far more energy by volume and weight than any battery, and ammonia really represents an option in the carrying/storing of hydrogen. We're getting there, painfully slowly, but we're getting there.


Looks like the market for cerium might just heat up a bit.  Sadly, the specific perovskite produced here (assuming it does not also incorporate barium, cobalt or iron) doesn't have an entry on that activity graph.  Further, the graph doesn't specify the temperature or pressure of the ammonia synthesis process and all related information is behind a paywall.

I hate when they do that.


Ah, here we go:

“Our catalysts show very high activity in the range of 240–400 °C at 0.9 MPa,” says Kitano—much milder conditions than the traditional Haber-Bosch process, which runs at around 500 °C and 20 MPa.

It does this by cutting the required activation energy roughly in half.  This looks to make ammonia synthesis an economical option wherever there's a stream of hydrogen available.

The comments to this entry are closed.