Ni/La2O3/α-Al2O3中的高温脱附氢促进CH4/CO2重整反应的初活性

催化学报 , 2006, 27(8): 659-663.

Ni/La2O3/α-Al2O3中的高温脱附氢促进CH4/CO2重整反应的初活性

崔月华 ^1, , 徐恒泳 ^2, , 葛庆杰 ^3, , 毕亚东 ^4, , 王玉忠 ^5, , 侯守福 ^6, , 李文钊 ^7,

1.中国科学院大连化学物理研究所,辽宁大连,116023

2.中国科学院大连化学物理研究所,辽宁大连,116023

3.中国科学院大连化学物理研究所,辽宁大连,116023

4.中国科学院大连化学物理研究所,辽宁大连,116023

5.中国科学院大连化学物理研究所,辽宁大连,116023

6.中国科学院大连化学物理研究所,辽宁大连,116023

7.中国科学院大连化学物理研究所,辽宁大连,116023

关键词：高温脱附氢 , 镍基催化剂 , 氧化镧 , 甲烷重整反应 , 初始速率

High Temperature Desorbed Hydrogen in Ni/La2O3/α-Al2O3 Improves the Initial Reaction Rate of CH4/CO2 Reforming

通过H2程序升温脱附实验,在H2还原的Ni/La2O3/α-Al2O3催化剂上可以明显观察到高温脱附氢(高温氢). 动力学实验结果表明,随催化剂上高温氢含量的增加, CH4/CO2重整反应的初始活性升高,同时高温氢也可在重整反应过程中原位生成,并使重整反应的活性最终达到稳定. 脉冲实验结果表明,随催化剂上高温氢含量的增加, CH4解离后生成的活性中间体CHx物种的x值也增大,进而降低了CHx与CO2反应的活化能,提高了CHx与CO2反应的速率. La2O3助剂的添加提高了Ni/La2O3/α-Al2O3催化剂上逆水气变换反应的速率,并且对CO2的活化也有促进作用. La2O3助剂的加入对于CH4/CO2重整反应的重要作用是使高温氢的数量增多且稳定性提高,有利于保持CHx物种中较高的x值,促进重整反应.

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