Superior performance of iridium supported on rutile titania for the catalytic decomposition of N 2 O propellants
Superior performance of iridium supported on rutile titania for the catalytic decomposition of N 2 O propellants
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DOI：
10.1016/s1872-2067(18)63077-3
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发表时间：
2018-07
影响因子：
16.5
通讯作者：
Shuangfei Liu;Nanfang Tang;Qinghao Shang;Chuntian Wu;Guoliang Xu;Y. Cong
中科院分区：
文献类型：
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作者：
Shuangfei Liu;Nanfang Tang;Qinghao Shang;Chuntian Wu;Guoliang Xu;Y. Cong
N2O是一种很有前途的绿色推进剂，在卫星推进系统中显示出巨大的潜力。由于N2O的高活化能，在600℃以下很难发生催化分解，而催化分解是启动推进过程的重要途径。在本工作中，我们报道了一种负载Ir的金红石型TiO2光催化剂(Ir/r-TiO2光催化剂)，它对高浓度N2O的分解表现出了相当高的活性。HAADF-STEM、H2-TPR和XPS结果表明，在Ir/r-TiO2上高分散的Ir粒子和提高的氧迁移率有利于N2O的分解和吸附氧的脱附。在条件下观察到了桥键过氧化氢中间体，并提出了详细的分解路线。
N2O is a promising green propellant and exhibits great potential for satellite propulsion systems. It is difficult for catalytic decomposition, which is an important way to initiate the propulsion process, to occur at temperatures below 600 °C due to the high activation energy of N2O. In this work, we report an Ir supported on rutile TiO2(Ir/r-TiO2) catalyst which exhibits a fairly high activity for high-concentration N2O decomposition. HAADF-STEM, H2-TPR, and XPS results indicate that highly dispersed Ir particles and improved oxygen mobility on the Ir/r-TiO2could facilitate the decomposition of N2O and desorption of the adsorbed oxygen. Bridge-bonded peroxide intermediates were observed within-situDRIFT and herein, a detailed decomposition route is proposed.