Effect of a Hydrogen Pretreatment on the Mechanism of Deuterium Addition and Exchange of Propene over Ni–Cu Alloy Catalysts
作者:Shuichi Naito、Mitsutoshi Tanimoto
DOI:10.1246/bcsj.64.1253
日期:1991.4
The effects of a hydrogen pretreatment on the activity and reaction intermediate in a C3H6–D2 reaction over a Ni–Cu alloy as well as Ni metal catalysts were investigated in detail by applying an isotope tracer technique. Ni metal and Ni-rich alloy catalysts, cooled down to the reaction temperature under a hydrogen atmosphere (D-surface), exhibited low activity compared to that of a surface evacuated
通过应用同位素示踪技术详细研究了氢预处理对 Ni-Cu 合金和 Ni 金属催化剂上 C3H6-D2 反应的活性和反应中间体的影响。与冷却前抽真空的表面(E 表面)相比,在氢气氛下(D 表面)冷却至反应温度的 Ni 金属和富 Ni 合金催化剂表现出较低的活性。然而,对于富铜合金催化剂,E 表面比 D 表面表现出较低的活性和较高的活化能。吸附氢的 TPD 光谱与活性对抽真空温度的依赖性的比较表明,强烈吸附的氢在较低温度下会延迟 Ni 和富 Ni 合金催化剂的反应。微波光谱分析表明,富铜合金催化剂的 D 和 E 表面上的反应中间体分别与 Cu 和 Ni 金属上的反应中间体相似。这一结果表明,一...