关键词: 氨分解, 催化剂, 活性, 制氢, 钡

Abstract: Nickel-based perovskite catalyst, for decomposing ammonia to produce hydrogen, has good stability and low cost, but also requires high decomposition temperature. In order to reduce the complete temperature decomposition of ammonia, experiments, using citrate method, by changing the A-site doping ions and doping amounts to modify LaNiO₃, were conducted with changed carriers and load amounts to prepare a series of catalysts. With XRD, SEM, TEM characterization, the effects of Ba on the structure and properties of catalyst were studied. Under the conditions of catalyst loading amount of 1mL, space velocity of 10000h^-1, and pure ammonia as feed gas, the best electronic aids ions of ammonia decomposition is Ba, the best catalyst is w(NiO) = 20% of La_0.9Ba_0.1NiO₃/MCM-41, which can make the complete decomposition temperature decrease from 650℃ to 575℃. With the increase of Ba doping amount, catalyst activity first increased, reaches a maximum at x = 0.1, and then decreased. Due to too much Ba doping, the structure of the catalyst change from perovskite to non-perovskite. The catalyst activity of perovskite is better than that of non-perovskite.

Key words: ammonia decomposition, catalyst, reactivity, hydrogen production, barium