摘要
采用脉冲反应技术，研究了ＣＨ４、ＣＨ４／Ｏ２（２／１）在还原态和氧化态铑基催化剂上的反应情况。观察到，在第一个ＣＨ４／Ｏ２（２／１）脉冲反应点中，氧化态催化剂上的甲烷转化率、ＣＯ２选择性显著高于还原态催化剂；从第二个脉冲反应点开始，氧化态催化剂上的甲烷转化率、产物选择性均与还原态催化剂上的基本接近，表明在第一个ＣＨ４／Ｏ２（２／１）脉冲反应点中，氧化态催化剂中的铑氧化物已被甲烷还原至金属态铑；从第二个脉冲反应点开始，ＣＨ４＋Ｏ２反应实际上在还原态的铑位上进行。由此推断。
The method of 'multiple step reflux impregnation' is put forward in this article for preparing high dispersion and high iron content supported catalyst for light olefin synthesis via carbon monoxide hydrogenation, with Fe 3(CO) 12 being the precursor.Characterization by XRD and other techniques shows that,although the iron content is high at 11%(mass), the state of iron on the surface of the catalyst support is in high dispersion.Effects of different temperatures of decarbonylation, iron contents and supports on catalyst preparing chemistry are also investigated.It is found that an iron content of 5.4 %(mass),using Y zeolite as a support and decarbonylating at 300℃ are more favourable and ZSM 5 is a best support.The catalyst using ZSM 5 as support exhibits an excellent selectivity of 99.8% to light olefin.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
1997年第2期21-25,共5页
Natural Gas Chemical Industry
基金
香港研究基金委员会资助
