NDLI: Catalytic Steam Reforming of Model Oxygenates of Bio-oil for Hydrogen Production Over La Modified Ni/CeO$_{2}$–ZrO$

Content Provider	SpringerLink
Author	Mondal, Tarak Kaul, Nidhi Mittal, Ritesh Pant, Kamal K.
Copyright Year	2016
Abstract	Catalytic steam reforming of model oxygenates of bio-oil for hydrogen production was studied over La modified Ni/CeO$_{2}$–ZrO$_{2}$ catalysts. The catalysts were prepared by an impregnation-co-precipitation method and characterized by various characterization techniques. Characterization results revealed that a homogeneous CeO$_{2}$–ZrO$_{2}$–La$_{2}$O$_{3}$ (CeZrLa) solid solution was formed during support preparation and the Ni-impregnated catalysts demonstrated strong metal-support interaction. The hydrogen selectivity for the catalyst doped with 5 wt% La$_{2}$O$_{3}$ was significantly higher than that for other La content, and CO and CH$_{4}$ selectivity also reduced. Conversion showed a sharp rise with increasing temperature from 600 to 800 °C, whereas hydrogen yield and selectivity exhibited maxima at 700 °C. At higher temperature, conversion increased due to steam reforming of oxygenates, while hydrogen yield decreased since the water gas shift reaction proceeds in the reverse direction. Increasing the space–time from 350 to 700 g$_{cat}$ s/g$_{bio-oil}$, conversion increased from 60 to 85 % and hydrogen yield increased from 42 to 70 % due to the availability of greater contact time of the reactants with the catalyst. No significant decrease in selectivity or conversion was observed for 20 h, indicating that the Ni/CeZrLa (5) catalyst is quite stable. In the spent catalyst obtained after reaction, there is evidence of formation of La$_{2}$O$_{2}$CO$_{3}$, which plays a key role in coke gasification and prolonged activity of the catalyst. Negligible coke deposition was found for the spent Ni/CeZrLa (5) catalyst compared to the undoped catalyst. The results revealed that the presence of lanthana helps in enhancing catalyst life by providing resistance to coking.
Starting Page	1343
Ending Page	1353
Page Count	11
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	59
Issue Number	15-16
e-ISSN	15729028
Language	English
Publisher	Springer US
Publisher Date	2016-07-25
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Steam reforming Hydrogen production Aqueous fraction of bio-oil La modified Ni/CeO$_{2}$–ZrO$_{2}$ Stable catalyst Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Catalysis Chemistry

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