甲烷干重整反应用Ni-Ru/MgAl类水滑石催化剂的研究  

Ni-Ru / MgAl Catalysts Derived from Hydrotalcites for the Dry Reforming of Methane

作　　者：余晓鹏[1] 张付宝[2] 

机构地区：[1]四川理工学院材料与化学工程学院,四川自贡643000 [2]中昊晨光化工研究院有限公司,四川自贡643002

出　　处：《分子催化》2015年第5期448-457,共10页Journal of Molecular Catalysis(China)

基　　金："绿色催化四川省高校重点实验室开放基金资助"(LYJ1502)~~

摘　　要：采用焙烧记忆法分别制备Ni/Mg Al O和NiRu/Mg Al O类水滑石催化剂用于甲烷干重整反应.利用XRD、TPR、TG、XPS、CO2-TPD、TEM等表征催化剂的结构及失活特征,发现在Ni/Mg Al O中添加Ru,有利于增加催化剂表面Ni含量,并促进Ni2+的还原.不同Mg/Al比双金属催化剂中,7Ni-0.15Ru/Mg2.5Al催化剂具有较高的催化活性,这归结为该催化剂适宜的碱性、较高表面Ni含量以及小尺寸的Ni0物种.添加Ru明显抑制Ni/Mg Al O催化剂表面的丝状碳的形成.而7Ni-0.15Ru/Mg2.5Al较强的抗积碳性能与其较小Ni0晶粒尺寸及适宜催化剂碱性有关.The Ni / MgAl O and NiRu / Mg Al O catalysts were prepared by calcined reconstruction method for the dry reforming of methane. X-ray diffraction,temperature programmed reduction of hydrogen,thermogravimetric analysis,X-ray photoelectron spectroscopy,temperature-programmed desorption of carbon dioxide and transmission electron microscopy were used to investigate the structure and deactivation characteristics of the catalysts. The introduction of Ru into the Ni / Mg Al O increased the surface Ni content and facilitated the reduction of Ni2＋species. The7Ni-0. 15 Ru / Mg2. 5Al catalyst possessed the higher catalytic activity,which was ascibed to the optimum basicity,high surface active metal content and small metal particles of the catalysts. The introduction of Ru into Ni / Mg Al O catalyst significantly suppressed the formation of filamentous coke. The 7Ni-0. 15 Ru / Mg2. 5Al catalyst exhibited strong resistance to coke formation,which was closely related to its small Ni0 particles and optimum basicity.

关 键 词：水滑石 焙烧记忆法 Ni-Ru 甲烷干重整 积碳 

分 类 号：O643.36[理学—物理化学]