摘要
采用共沉淀法制备了γ-Al2O3载体和La添加量不同的LaxAl100-xO(m(La):m(Al)=x:(100-x))载体,然后用浸渍法制备了Ni负载量(质量分数)为10％的Ni／γ-Al2O3和Ni／LaxAl100-xO催化剂。用X射线衍射技术对Ni/γ-Al2O3和Ni／ LaxAl100-xO催化剂进行了表征,并在固定床微反装置中考察了Ni／γ-Al2O3和Ni/LaxAl100-xO催化剂对甲烷自热重整制氢反应的催化性能。实验结果表明,添加La的催化剂催化性能有很大提高。考察了反应温度、原料气配比和甲烷空速对Ni/La30Al70O催化剂催化性能的影响。实验结果表明,反应温度和n(O2):n(CH4)对Ni/La30Al70O催化剂的催化性能影响较大;在n(CH4):n(O2): n(H2O)=1．00:0．50:2．50、反应温度800℃、甲烷空速4 800 h-1的条件下,甲烷转化率达到100％,H2收率为67％。
γ-Al2O3 and LaxAl100-xO （ m （La） ： m （ Al ） = x ： （ 100-x ） ） supports were prepared by coprecipitation. Ni/γ-Al2O3 and Ni/LaxAl100-xO catalysts were prepared by impregnation. The catalysts were characterized by means of XRD. Their catalytic performances in methane autothermal reforming to produce hydrogen were studied in a fixed-bed reactor. Addition of La improved activity of catalyst. Effects of reaction conditions, namely reaction temperature, n （ O2 ） ： n （ CH4 ）, n （H2O） ： n （ CH4 ） and gas hourly space velocity（GHSV） of CH4, on activity of Ni/La30Al70O catalyst（ mass fraction of La in support was 30% ） were investigated. CH4 conversion and H2 yield increased at higher reaction temperature. Catalytic activity of Ni/La30Al70O catalyst was the best when n（ O2 ） ： n（ CH4 ） was 0.50. It was only slightly affected by change of n（ H2O） ： n（ CH4 ） and almost unchanged while GHSV of CH4 varied from 2 400 to 7 200 h^-1. CH4 conversion and CO selectivity decreased when GHSV of CH4 was further raised to 9 600 h^-1. Under n（CH4） ： n（O2） ： n（H2O） = 1.00 ： 0.50 ： 2.50,reaction temperature 800℃ ,and GHSV of CH4 4800 h ^-1 ,CH4 conversion and H2 yield were 100% and 67%, respectively.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2006年第4期324-328,共5页
Petrochemical Technology
基金
广东省自然基金资助项目(030514)广东省科技计划项目(2004B33401006)。
关键词
镍
镧
催化剂
载体
共沉淀
甲烷
自热重整
制氢
nickel
lanthanum
catalyst
support
coprecipitation
methane
autothermal reforming
hydrogen production
作者简介
蔡秀兰（1978～），女，山东省招远市人。博士生，电话020—88528754，电邮xaixiulan2001@yahoo．com．cn。
联系人：林维明，电话020-31873889，电邮wmlin@gzhu．edu．cn。
