摘要
甲烷和二氧化碳是2种主要的温室气体,它们的大量排放导致了全球气候变暖、冰川融化、海平面水位上升等一系列严重的环境问题,但同时这2种气体也是重要的碳氢资源,对世界新能源开发利用有着极大地作用。利用CH-4/CO_2重整制取合成气是同时解决这2种气体排放问题的有效方法。文中主要对Ni基催化剂上CH_4/CO_2重整制取合成气的催化活性进行了研究。采用浸渍法制备了一系列的Ni基催化剂,对催化剂的制备方法、反应条件等的影响进行了一系列的分析探讨,并对催化剂进行了BET,SEM,XRD和TG表征分析。结果表明,活性组分Ni和助剂Rh的最佳负载量(质量分数)分别为10%和0.1%,当反应条件为常压、600℃、空速4 500 h^(-1)及n(CO_2)/n(CH_4)=1时,催化剂质量分数0.1%Rh-10%Ni/γ-Al_2O_3上的CH_4,CO_2的转化率分别可达96.69%和88.57%,合成气比例n(H_2)/n(CO)≈1。
Responsible for series of environmental problems like global warming,melting iceberg,rising sea level and so forth,methane and carbon dioxide are two major kinds of green house gases released during human＇s living and producing activities and natural process. They are also important hydrocarbon raw materials,and the key to exploitation and application of new source of energy. One effective way to reduce emissions of both gases is by synthesizing syngas using methane and carbon dioxide through reforming reaction. A series of nickel-based catalysts with different supports and loadings of nickel as well as rhodium were synthesized by impregnation and evaluated with BET method,SEM,XRD together with TG techniques for the reforming of methane and carbon dioxide. The results show that the optimal loadings of the active component nickel and the promoter rhodium are 10% and 0. 1%respectively. With the pressure at 100 k Pa,temperature at 600 ℃,GHSV at 4 500 h（-1）,the molar ratio of carbon dioxide and methane at 1,the conversion rates of carbon dioxide and methane over 0. 1% Rh-10% Ni/γ-Al_2O_3 can reach 96. 69% and 88. 57% respectively,and the amount of hydrogen obtained is approximately equal to that of carbon monoxide in the syngas.
出处
《化学工程》
CAS
CSCD
北大核心
2016年第11期7-12,共6页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(21176108)
国家863重大专项子课题(2011AA06A106)
关键词
NI催化剂
贵金属Rh
干重整
合成气
nickel-based catalyst
noble metal rhodium
dry-reforming
syngas
