Ammonia decomposition over nickel catalysts supported on alkaline earth metal aluminate for H2 production

Self-combustion Ni and Co-based perovskites as catalyst precursors for ammonia decomposition. Effect of Ce and Mg doping

“…Supports must provide a high dispersion of the active phase, and, particularly for catalytic ammonia decomposition, high conductivity, and relative basicity, which enhance recombinative desorption of nitrogen, leading to higher catalytic activities [10,12,17]. The use of alkaline (K and Cs), alkaline-earth (Mg, Ca, Ba and Sr), and rare-earth (La and Ce) promoters improves the catalytic activity through the increase in the electron density in the metal by the high basic properties of these kind of promoters, and the possibility to decrease the size of the metal crystallites [18][19][20][21]. Moreover, ammonia decomposition is a structure sensitive reaction clearly affected by the size of the metal [7,22].…”

Selective Conversion of Furfural into Diols over Co-Based Catalysts: Importance of the Coordination of Hydrogenation Sites and Basic Sites

“…In addition, the Co–Mg catalyst also showed a relatively lower amount of basic sites than the Co–Mg–Al catalysts owing to the smaller surface area (Table ). The abundance of basic sites in Co–Mg–Al catalysts could shift the desorption peaks of hydrogen to a lower temperature via alleviating the adsorption energy of hydrogen (Tables and ), and the 1.5Co–1.5Mg–Al catalyst with abundant basic sites exhibited easier desorption of hydrogen, which could provide more activated hydrogen for the hydrogenation of furfural to 1,5-PDO and would be further discussed. Figure d shows the distribution of acidic sites.…”

COx-free hydrogen production from ammonia at low temperature using Co/SiC catalyst: Effect of promoter

“…Recently, different promoters have been studied to improve the ammonia decomposition reaction through the increase of the electron density in the metal by increasing of the basic sites of the catalysts [23,26,27]. Additionally, it is known that the addition of promoters to non-noble metals catalysts could modify the metal particle size increasing the metal dispersion, maintaining the stability of the catalyst over long reaction times by the inhibition of the agglomeration of metal particles [23,26].…”