摘要
用红外光谱法研究了丙烯、丙烯 /氧气混合气以及环氧丙烷 (PO)在Cu NaCl/SiO2 催化剂上的吸附 .结果表明 ,丙烯在载体和催化剂上的吸附是完全可逆的 .丙烯和氧气在催化剂上共吸附后生成了丙烯醛 ,未观察到环氧丙烷 (PO)生成 .PO在载体和未还原催化剂上的吸附行为表明 ,PO与载体的硅羟基有强相互作用 ,PO发生开环反应生成开环物种 .而PO在还原态催化剂上的吸附行为较复杂 ,可能生成了酮类化合物 .
The direct epoxidation of propylene to propylene oxide (PO) using molecular oxygen as the oxidant has attracted intense interest in recent years. We have reported that the Cu catalyst is effective for this reaction. In this paper, FT-IR spectroscopy is employed to investigate the adsorption of propylene, propylene/oxygen mixture and propylene oxide on the Cu-NaCl/SiO 2 catalyst. It is found that propylene adsorption on the support and catalyst is reversible. For the propylene/oxygen mixture, no formation of PO but acrolein is observed on either unreduced or reduced catalyst. When PO is adsorbed on the support and unreduced catalyst, a ring-open reaction occurs through the interaction of PO with Si-OH on the support surface. The adsorption of PO on the reduced catalyst is more complicated and ketones may be produced.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2004年第11期855-861,共7页
基金
国家自然科学基金 ( 2 0 0 73 0 45
2 0 2 3 3 0 5 0
2 0 2 73 0 69
2 0 3 73 0 69)
国家重点基础研究发展计划 ( 2 0 0 3CB615 80 6)资助项目
关键词
丙烯
环氧化
环氧丙烷
铜
氧化硅
负载型催化剂
吸附
红外光谱
propylene, epoxidation, propylene oxide, copper, silica, supported catalyst, adsorption, infrared spectroscopy
