摘要
采用ＮＨ３－ＴＰＤ技术考察了ＮｉＯ／Ａｌ２Ｏ３表面酸性，发现Ｌｉ和Ｌａ的添加使催化剂的表面酸性强度和酸性中心数目低于相应的ＮｉＯ／Ａｌ２Ｏ３。同时利用ＴＧ、ＴＰＯ－ＭＳ、ＸＰＳ等技术考察了ＮｉＯ／Ａｌ２Ｏ３和ＬｉＮｉＬａＯ／Ａｌ２Ｏ３上的甲烷部分氧化制合成气积炭情况。发现Ｌｉ和Ｌａ的添加显著提高了催化剂的抗积炭能力。ＬｉＮｉＬａＯ／Ａｌ２Ｏ３上甲烷部分氧化反应寿命实验表明，反应连续进行２００ｈ，ＣＨ４转化率一直保持不变，这说明Ｌｉ和Ｌａ的添加还可以提高ＮｉＯ／Ａｌ２Ｏ３的热稳定性。
The acid base properties and carbon deposition of NiO/Al 2O 3 and LiNiLaO/Al 2O 3 catalysts for partial oxidation of methane to syngas have been studied by using NH 3 TPD, TG, TPO MS, and XPS techniques. It is found that the surface acid strength of LiNiLaO/Al 2O 3 is much smaller than that of NiO/Al 2O 3. Addition of Li 2O and La 2O 3 has enhanced the ability to suppress carbon deposition on a nickel based catalyst. Methane conversion keeps constant during 200h life test for partial oxidation of methane over LiNiLaO/Al 2O 3, indicating that introduction of Li 2O and La 2O 3 can also enhance the thermal stability of the nickel based catalyst.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
1998年第5期5-7,共3页
Natural Gas Chemical Industry
关键词
甲烷
部分氧化
积炭
合成气
催化剂
镍
锂
镧
partial oxidation of methane
carbon deposition
thermal stability
NiO/Al 2O 3
LiNiLaO/Al 2O 3
