Extended Data Fig. 6: Catalytic performance and related characterizations of ammonia synthesis.
From: Vacancy-enabled N2 activation for ammonia synthesis on an Ni-loaded catalyst
a–d, Ammonia synthesis activity over Ni/LaN bulk (a, b) and Ni/LaN NPs (c, d), with various amounts of Ni loading. e, Time course of ammonia synthesis over different batches of Ni/LaN NPs and Ni/LaN bulk catalysts. f, Pressure dependence of the ammonia synthesis activity over Ni/LaN NPs. g, h, TPD profile (g) and Raman spectrum (h) for used Ni/LaN bulk after 100 h of reaction. i, Ammonia synthesis activity over various metals supported on LaN bulk catalysts. Ni(C5H5)2, Fe2(CO)9, Co2(CO)8 and Ru3(CO)12 were used as Ni, Fe, Co and Ru precursors, respectively. Error bars in a–d, f and i represent the standard deviation from three independent measurements. Reaction conditions: catalyst, 0.1 g; WHSV, 36,000 ml gcat−1 h−1; 340−400 °C, 0.1−0.9 MPa.
