摘要
考察了加压(0.2～1.0MPa)条件下BaNi_(0.3)Al_(11.7)O_(19-δ)催化剂对甲烷部分氧化(POM)制合成气反应的催化性能,并且与LiLaNiOx/γAl2O3的POM催化性能进行了比较.BaNi_(0.3)Al_(11.7)O_(19-δ)催化剂具有良好的POM催化性能,在850℃和1.0MPa下,可得到75%的甲烷转化率和85%的CO选择性.在60h的连续实验中,催化剂活性及选择性基本保持不变,显示出较高的催化稳定性.用XRD,XPS和TG/DTA表征手段研究了反应前后催化剂的晶体结构、表面性质以及积碳行为,结果表明该催化剂具有较强的抗Ni流失和抗积碳能力.BaNi_(0.3)Al_(11.7)O_(19-δ)的六铝酸盐结构中Ni离子和相邻原子之间的相互作用使其具有较高的热稳定性及结构稳定性,从而显示出良好的POM催化活性和稳定性.
Partial oxidation of methane （POM） to syngas over the BaNi0.3Al11. 7O19-δ hexaaluminate catalyst was performed at 700-850℃ under high pressure （0.2-1.0 MPa）. Compared with the LiLaNiOx/γ-Al2O3 catalyst, the BaNi0.3Al11.7O19-δ catalyst exhibited excellent catalytic performance, and 75 % of CH4 conversion and 85 % of CO selectivity were obtained at 850℃ and 1.0 MPa. In addition, the catalyst showed good catalytic stability, and its activity and selectivity remained unchanged in the 60 h continous reaction. The crystal structure, surface properties and carbon deposition of the catalyst were investigated by XRD, XPS and TG/DTA. It was revealed that the interaction between Ni ions and the neighbouring atoms in the hexaaluminate structure increased the thermal and structural stability of this catalyst and suppressed the carbon deposition on the catalyst. Thus the catalyst exhibited good catalytic stability in POM to syngas.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2005年第8期683-687,共5页
关键词
甲烷
部分氧化
合成气
六铝酸盐
稳定性
methane, partial oxidation, syngas, hexaaluminate, stability
