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Coupled reforming of methane to syngas (2H2-CO) over Mg-Al oxide supported Ni catalyst
Applied Catalysis A: General ( IF 4.7 ) Pub Date : 2017-11-06 , DOI: 10.1016/j.apcata.2017.11.004
Maoshuai Li , André C. van Veen

We report bi-reforming and coupled reforming of methane with carbon dioxide, steam and/or oxygen to produce syngas over Ni supported on Mg-Al mixed oxide. The catalyst has been characterised in terms of specific surface area, TPR, XRD, TGA-DTG, SEM and TPO-MS analysis. Ni/Mg-Al mixed oxide exhibited Ni particle size range (11–30 nm) with a mean of 20.7 nm. Syngas H2/CO = 2.0, suitable for methanol/Fischer-Tropsch fuel synthesis, has been achieved for both reactions (T = 1048 K, P = 1 atm). The impact of process parameters including temperature, feeding concentration and GHSV on conversion and H2/CO ratio has been demonstrated. The Ni catalyst suffered temporal activity decline in bi-reforming that can be linked to formation of carbon whiskers encapsulated Ni particles resulting in a loss of active sites. Coupled reforming delivered higher CH4 conversion and enhanced stability, but lower CO2 conversion than bi-reforming under similar conditions. The enhanced stability in coupled reforming can be attributed to lower carbon deposition on Ni particles due to combustion of carbon by oxygen.



中文翻译:

Mg-Al氧化物负载的Ni催化剂上甲烷重整成合成气(2H 2 -CO)

我们报道了甲烷与二氧化碳,蒸汽和/或氧气的双重重整和耦合重整,以在负载于Mg-Al混合氧化物上的Ni上产生合成气。该催化剂已根据比表面积,TPR,XRD,TGA-DTG,SEM和TPO-MS分析进行了表征。Ni / Mg-Al混合氧化物的Ni粒径范围(11–30 nm),平均值为20.7 nm。两种反应均实现了适用于甲醇/费托燃料合成的合成气H 2 / CO = 2.0(T = 1048 K,P = 1 atm)。温度,进料浓度和GHSV等工艺参数对转化率和H 2的影响/ CO比已得到证明。Ni催化剂在双重整中的时间活性下降,这可能与碳晶须包封的Ni颗粒的形成有关,导致活性位点的损失。在相似条件下,偶联重整可实现更高的CH 4转化率和更高的稳定性,但与双重整相比,其CO 2转化率更低。偶合重整中增强的稳定性可归因于由于氧气燃烧碳而降低了Ni颗粒上的碳沉积。

更新日期:2017-11-06
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