Catalytic decomposition of nitrous oxide on alumina-supported ruthenium catalysts Ru/Al2O3
Catalytic decomposition of nitrous oxide on alumina-supported ruthenium catalysts Ru/Al2O3
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DOI：
10.1016/s0926-3373(96)00096-3
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发表时间：
1997-10
影响因子：
22.1
通讯作者：
H. Zeng;X. Pang
中科院分区：
文献类型：
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作者：
H. Zeng;X. Pang
本文研究了不同钌含量（Ru wt% = 0.00 - 0.26）的Ru-Al_2 O_3体系对N_2O（28mol%）的催化分解。优化后的催化剂在4.8 × 104μmol（N2 O）g−1h−1400°C具有较高的催化活性。研究表明，Ru Al 2 O3的比表面积随金属负载量的增加而减小。形成了两种不同类型的表面结构，并且在它们之间的中间区域发现了优化的催化剂。该催化剂已被进一步研究与各种背景气体（O2，CO2，和H2O）。结果表明，O2对高转化率反应的抑制作用不大，但在低转化率（低温）时有一定的抑制作用。以CO2为探针气体考察了催化剂的酸碱性。与不吸附在催化剂上的CO2相反，水显示出阻碍分解的强烈倾向。在优化的催化剂上的反应可以描述为一级相对于N2 O分压。利用这项工作的结果，已提出了一个两步法己二酸废气处理。
The catalytic decomposition of N2O (28 mol%) has been studied for the Ru Al2O3system with various ruthenium contents (Ru wt% = 0.00 – 0.26). The optimized catalyst of the studied system has a high catalytic activity of 4.8 × 104μmol (N2O) g−1h−1400°C. The study shows that the surface area of Ru Al2O3decreases with increase of loading of the metal. Two different types of surface structure are formed, and the optimized catalyst is found in the intermediate region between them. The catalyst has been investigated further with various background gases (O2, CO2, and H2O). It is found that O2has little inhibitive effect on the high conversion rate reaction while it shows a certain effect at low conversion (low temperature). Acidity-basicity of the catalyst has been examined with the probe gas CO2. In contrast to CO2, which does not adsorb on the catalyst, water shows a strong tendency to hamper the decomposition. The reaction on the optimized catalyst can be described as first order with respect to N2O partial pressure. Using the findings of this work, a two-step process has been proposed for the adipic acid off-gas treatment.