摘要
用Ｌａ－Ｂａ－Ｏｘ－助剂作为甲烷氧化偶联催化剂，研究了从０．５ｍｌ放大到３０ｍｌ和２００ｍｌ装量时催化剂的稳定性。实验表明，在催化剂装量放大时用薄层反应器和通过反应条件的合理调整（如适当地降低反应空速与反应管外加热的温度等），使２００ｍｌ装量的催化剂反应时床层热点温度与０．５ｍｌ催化剂床层的热点温度相差≤６０℃，从而在ＣＨ４∶Ｏ２＝（４．７５～５．０８）∶１、ＣＨ４空速５０００ｈ－１、催化剂床层热点温度８４０℃条件下，实现了２００ｍｌ装置催化剂的１０００ｈ稳定运转，其Ｃ２选择性和收率分别保持在６２．４％～７１．９％和１６．５％～１７．３％，甲烷转化率为２３．５％～２６．６％。该结果与０．５ｍｌ催化剂装量的１０００ｈ稳定性实验结果基本一致。
The stability of La Ba Ox Promoter,which is used as the catalyst for oxidative coupling of methane,has been investigated inscaling up tests with the catalyst charging amounts increasing from o.5 ml to 30ml and 200ml respectively.The results show that using a thin layer fixed bed reactor and reasonably regulating reaction conditions such as CH 4 space velocity,preheating temperature,etc., made the maximum temperature difference between the catalyst beds of 0.5ml and 200ml equal or less than 60℃. After a 1000h continuous test run with 200ml catalyst at CH 4∶O 2=4.75～5.08∶1,CH 4 space velocity 5000h -1 and bed temperature 840℃, the structure and performance of the catalyst did not change a lot and the activity of the catalyst kept steady with C 2 selectivity and yield being 62.4%～71.9% and 16.5%～17.3% respectively,which is almost identical to the experimental result in a 0.5ml catalyst bed under the optimun reaction conditions.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
1997年第2期33-37,共5页
Natural Gas Chemical Industry
关键词
甲烷
氧化偶联
催化剂稳定性
乙烯
oxidative methane coupling, scaling up test, catalyst stability
