摘要
在常压固定床石英反应器上,考察了在CH_4氧化偶联反应La_2O_3/BaCO_3催化剂上碱金属化合物的添加效应,测试了各种因素(温度、空速、烷氧比等)对选择性、收率的影响。结果发现,在La_2O_3/BaCO_3上添加第三组分碱金属化合物后,其CH_4转化率可提高到33.5%,C_2烃选择性可提高到58.2%。同时,运用TPD方法,X衍射和电子能谱等手段对催化剂进行了表征,发现该类催化剂对氧有强吸附作用,此吸附作用在反应中有重要作用;在反应过程中,催化剂的结构和表面组成也有一定的变化。
The additive effects of alkali compounds on La_2O_3/BaCO_3 catalysts for methane oxidative coupling were investigated using a fixed bed quartz reactor , and the surface characteristics of these catalysts were observed by means of TPD, XRD and XPS. It was found that alkali compound-promoted La_2O_3/BaCO_3 catalysts show a high activbity, C_2- selectivity and C_2-yield. The strong absorption of O_2 on these catalysts is important to the reaction. The variations of catalyst surface structure and components were also observed.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
1992年第4期7-12,共6页
Natural Gas Chemical Industry
基金
国家自然科学基金
