The roles of Co-precipitation pH, phase-purity and alloy formation for the ammonia decomposition activity of Ga-promoted Fe/MgO catalysts

Review of the Decomposition of Ammonia to Generate Hydrogen

“…Using natural limonite, a Fe mineral with small amounts of Si, Al, Ca, and Mg, Tsubouchi et al obtained good conversion values and proposed that the decomposition of ammonia catalyzed with Fe proceeds through a cyclic mechanism that involves both metallic iron and its nitride form. Similarly, a series of Fe catalysts supported on MgO and promoted with Ga were prepared and tested for the decomposition of ammonia, obtaining good activity compared to a catalyst composed only of Fe, and also with respect to Fe/MgO and Fe/MgO promoted with Al . Other supports that have been used for Fe are SiO 2 , Al 2 O 3 , CeO 2 , SrO, ZrO 2 , and CeO 2 –ZrO 2 , obtaining the highest conversion with the ceria-zirconia mixture .…”

Prospects and challenges for autonomous catalyst discovery viewed from an experimental perspective

“…161 Due to the proven reproducibility of the syntheses and the recording of all data and metadata, such fully automated instruments, which are also available in smaller batch sizes for screening studies (e.g., OptiMax, Mettler-Toledo) (Fig. 3B), 163,164 are routinely and exclusively used for all aqueous precipitation syntheses in our laboratory. However, the proprietary data format of the manufacturer makes it difficult to automatically upload the synthesis data into a database and link this data to the database entry of the precipitate.…”

“…, OptiMax, Mettler-Toledo) (Fig. 3B), 163,164 are routinely and exclusively used for all aqueous precipitation syntheses in our laboratory. However, the proprietary data format of the manufacturer makes it difficult to automatically upload the synthesis data into a database and link this data to the database entry of the precipitate.…”

Noble-metal-free nanocatalysts for hydrogen generation from boron- and nitrogen-based hydrides

“…Fe-Based catalysts have been extensively studied in the NH 3 decomposition reaction owing to its industrial use in the NH 3 synthesis reaction. [299][300][301][302][303][304] Fe promoted by K 2 O, CaO, SiO 2 and Al 2 O 3 is active for NH 3 synthesis at temperatures above 400°C and was initially considered as a potential pre-catalyst for NH 3 decomposition. 299 The overall activity of Fe-based pre-catalysts toward NH 3 decomposition is relatively low.…”

“…Great efforts have been made to enhance the catalytic performances of Fe-based catalysts by depositing Fe onto supports such as carbon nanotubes, zeolites, and metal oxides, since their properties such as reducibility, particle size and dispersion, thermal stability and electronic structures would be improved after Fe particles are supported. [301][302][303]305 For example, Duan et al synthesized a novel Fe-CNF/mica pre-catalyst via a catalytic CVD method and it showed excellent catalytic activity for NH 3 decomposition. 305 They also found that the size and shape of Fe particles on the top of CNFs depended on the Fe particle reconstruction and CNF morphology.…”