Ammonia Synthesis Activity of Alumina-Supported Ruthenium Catalyst Enhanced by Alumina Phase Transformation,ACS Catalysis

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Ammonia Synthesis Activity of Alumina-Supported Ruthenium Catalyst Enhanced by Alumina Phase Transformation
ACS Catalysis ( IF 11.3 ) Pub Date : 2019-01-15 00:00:00 , DOI: 10.1021/acscatal.8b03554
Bingyu Lin ₁ , Lan Heng ₁ , Biyun Fang ₁ , Haiyun Yin ₁ , Jun Ni ₁ , Xiuyun Wang ₁ , Jianxin Lin ₁ , Lilong Jiang ₁

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The increase of alumina calcination temperature from 800 °C to 1300 °C results in the transformation of γ-Al₂O₃ to α-Al₂O₃ phase accompanying a decrease of specific surface area and the amount of tetrahedral Al³⁺ sites. Over Ru–Ba/alumina catalysts, an increase in alumina calcination temperature would broaden the size distribution of Ru particles, enlarge the metal-to-oxide ratio of Ru, decrease the amount of surface hydroxyl groups, as well as lower the temperature for N₂ desorption. As a result, the increase of alumina calcination temperature lessens the effect of hydrogen poisoning and decreases the activation energy for ammonia synthesis. The Ru–Ba/Al₂O₃ catalyst with alumina calcined at 980 °C having both θ-Al₂O₃ and α-Al₂O₃ shows ammonia synthesis rate three times higher than that with alumina calcined at 800 °C having a γ-Al₂O₃ phase.

中文翻译：

氧化铝相变增强氧化铝负载钌催化剂的氨合成活性

从800℃的氧化铝焙烧温度至1300℃会导致γ-Al的转化增加₂ ö ₃到的α-Al ₂ ö ₃相伴随的比表面积的减少和四面体Al的量³⁺位点。在Ru-Ba /氧化铝催化剂上，氧化铝煅烧温度的升高会加宽Ru颗粒的尺寸分布，增大Ru的金属氧化物比，减少表面羟基的数量，并降低N的温度₂解吸。结果，氧化铝煅烧温度的升高减轻了氢中毒的影响并降低了氨合成的活化能。Ru–Ba / Al ₂ O₃催化剂与氧化铝在980煅烧℃下同时具有θ-Al系₂ ö ₃和α-Al系₂ ö ₃示出的氨合成率高于与氧化铝在800℃下煅烧具有的γ-Al三次₂ ö ₃相。

更新日期：2019-01-15

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