氨合成铁催化剂上化学吸附物种的in-situ FTIR谱; In-situ FTIR Spectra of Chemisorbed Species on Iron Catalysts for Ammonia Synthesis | |
廖代伟 ; 林种玉 ; 蔡启瑞 | |
1996-09 | |
关键词 | 原位傅里哀变换红外光谱 合成氨催化反应机理 化学吸附物种 同位素验证 In-situ FTIR Catalytic reaction mechanism of ammonia synthesis Chemisorbed species Isotopic verification |
英文摘要 | [中文文摘]应用原位傅里哀变换红外光谱方法,分别在400~450℃、常压、高空速(12000~14400h.s.v.g.)的H2、N2/3H2或N2气氛的动态条件下,检测了双促进氨合成铁催化剂上的化学吸附物种,并分别在D2、N2/3D2或15NH3/H2气氛中,进行了常规同位素验证实验.结果表明,催化剂表面的主要含氮化学吸附物种是分子态的N2.ad,其u(N-N)=2036cm-1(s),2012cm-1(w)和1935cm-1(w),而不是原子态的Nad,其u(Fe-N)=1087cm-1(vw),和NHad其u(Fe-N)=886cm-1(vw),表面有相当量的化学吸附氢存在,其v(Fe-H)=2056cm-1(s),1950cm-1(ms),1931cm-1(m),1902cm-1(w),915cm-1(s,桥式)等.作为与报道过的激光拉曼光谱的互补研究,本结果支持了以缔合式途径为主、解离式途径为次的平行竞争缔合式合成氨催化反应机理.[英文文摘]Chemisorbed species on doubiy promoted ammonia synthesis iron catalysts are investigated by in-situ Fourier transform infrared spectroscopy under dynamic conditions of H2, N2/3H2, and N2, respectively, with high space velocity (12 000~14 400 h-1) at 1 atm and400 ~450℃. Also, the general isotopic verifications are carred out with D2, N2/3D2, and NH3/H2, respectively. The results indicated that, under above reaction condition, the most aboundant chemisorbed N-containing species are molecular N2,ad with u(N-N)=2036 cm-1(s),2012 cm-1(w) and 1935 cm-1(w),rather than atomic Nad with u(Fe-N)=1087 cm-1(vw) and NHad with u(Fe-N)=886 cm-1 (vw).There are a lot of chemisorbed hydrogen with u(Fe-H)=2056 cm-1(s),1950 cm-1(ms),1931 cm-1(m),1902 cm-1(w) and 915 cm-1(s,dridge).As a complementary study for the laser Raman spectra previously reported,this paper supported the associative catalytic reaction mechanism of ammonia synthesis with both parallel competitive major associative pathway and minor dissociative pathway. |
语种 | 中文 |
出版者 | 《厦门大学学报(自然科学版)》编辑部 |
内容类型 | 期刊论文 |
源URL | [http://dspace.xmu.edu.cn/handle/2288/12352] ![]() |
专题 | 化学化工-已发表论文 |
推荐引用方式 GB/T 7714 | 廖代伟,林种玉,蔡启瑞. 氨合成铁催化剂上化学吸附物种的in-situ FTIR谱, In-situ FTIR Spectra of Chemisorbed Species on Iron Catalysts for Ammonia Synthesis[J],1996. |
APA | 廖代伟,林种玉,&蔡启瑞.(1996).氨合成铁催化剂上化学吸附物种的in-situ FTIR谱.. |
MLA | 廖代伟,et al."氨合成铁催化剂上化学吸附物种的in-situ FTIR谱".(1996). |
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