scholarly journals Exploitation Properties of Ni-Pd/Al2O3 Catalyst Supported on Ceramic Foam

10.30544/74 ◽  
2015 ◽  
Vol 21 (4) ◽  
pp. 277-282
Author(s):  
Vesna Nikolić ◽  
Željko Kamberović ◽  
Zoran Anđić ◽  
Marija Korać ◽  
Miroslav Sokić ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Ceramic Foam ◽  
Methane Reforming ◽  
Standing Time ◽  
Α Al2o3 ◽  
Al2o3 Catalyst

The goal of this research was to examine exploitation properties of Ni-Pd/Al2O3 catalyst supported on α-Al2O3 based foam in the dry methane reforming. The catalyst was prepared by using aerosol method. Chloride precursors for Ni and Pd were reduced by hydrogen at low temperature of 533 K, without previous calcination. The reforming experiment was performed for 3 h, with standing time of 1 h for each of the following temperatures: 873, 973 and 1023 K. Conclusions on selectivity, catalytic activity and stability were made on the basis of CO and H2 yields.

scholarly journals Ni-Pd-Al2O3 catalyst supported on reticulated ceramic foam for dry methane reforming

10.30544/133 ◽  
2015 ◽  
Vol 21 (1) ◽  
pp. 57-63
Author(s):  
Vesna Nikolić ◽  
Željko Kamberović ◽  
Marija Korać ◽  
Miroslav Sokić ◽  
Zoran Anđić ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Ceramic Foam ◽  
Methane Reforming ◽  
Salt Solutions ◽  
Metal Chlorides ◽  
Calcination Step ◽  
Α Al2o3 ◽  
Al2o3 Catalyst ◽  
Very Low Temperature

In the present study, Ni-Pd/Al2O3 catalyst supported on α-Al2O3 based foam was prepared and evaluated in the dry methane reforming process. Corresponding metal chlorides were deposited to the foam surface by impregnation of the foam with ultrasonically aerosolized salt solutions at 473 K and drying at that temperature. Calcination step was excluded and the catalyst was reduced at very low temperature – 533 K. The reforming experiment lasted for 3 h, with standing time of 1 h at the following temperatures: 873, 973 and 1023 K. Conclusions on selectivity, catalytic activity and stability were reached on the basis of CO and H2 yields.

scholarly journals A Comparison of the Efficiency of Catalysts Based on Ni, Ni-Co and Ni-Mo in Pressure Pyrolysis of Biomass Leading to Hythane

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1480
Author(s):  
Pavel Straka ◽  
Olga Bičáková ◽  
Tomáš Hlinčík
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Thermal Conversion ◽  
Hydrogen Atmosphere ◽  
Different Types ◽  
Secondary Reactions ◽  
Low Temperature Pyrolysis ◽  
Pyrolysis Of Biomass ◽  
Al2o3 Catalyst

A thermal conversion of biomass to hythane using catalysts was studied. Low-temperature pyrolysis of two different types of biomass was performed in a pressure sealed reactor, and the resulting gas with high contents of CO2 and CO was methanized in a hydrogen atmosphere at a pressure of 30 bar. As catalysts, Ni/Al2O3, NiCo/Al2O3 and NiMo/Al2O3 were used and their catalytic activity was evaluated. The NiCo/Al2O3 catalyst showed the highest catalytic activity, Ni/Al2O3 had a lower but comparable one, and NiMo/Al2O3 showed the lowest activity. The resulting hythane contained 70 vol.% CH4 and 10 vol.% H2 (with NiCo/Al2O3 catalyst, HHV 29.20 MJ/m3, LHV 26.32 MJ/m3), or 57 vol.% CH4 and 23 vol% H2 (with Ni/Al2O3, HHV 25.92 MJ/m3, LHV 23.21 MJ/m3) or 47 vol.% CH4 and 27 vol.% H2 (with NiMo/Al2O3, HHV 23.23 MJ/m3, LHV 20.76 MJ/m3). It has been found that secondary reactions of volatile biomass products are of great importance for successful pressure pyrolysis.

A novel Pd3O9@α-Al2O3 catalyst under a hydroxylated effect: high activity in the CO oxidation reaction

2015 ◽  
Vol 17 (48) ◽  
pp. 32140-32148 ◽  
Author(s):  
Qiaohong Li ◽  
Yongqin Wei ◽  
Rongjian Sa ◽  
Zuju Ma ◽  
Kechen Wu
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
High Activity ◽  
Oxidation Reaction ◽  
Co Oxidation Reaction ◽  
Α Al2o3 ◽  
Al2o3 Catalyst

A new Pd3O9@α-Al2O3 catalyst has been designed which shows superior catalytic activity for CO oxidation.

scholarly journals Influence of Co-Precipitation Agent on the Structure, Texture and Catalytic Activity of Au-CeO2 Catalysts in Low-Temperature Oxidation of Benzyl Alcohol

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 641
Author(s):  
Lukasz Wolski ◽  
Grzegorz Nowaczyk ◽  
Stefan Jurga ◽  
Maria Ziolek
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Low Temperature ◽  
Benzyl Alcohol ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Oxidation Of Benzyl Alcohol ◽  
Key Factor ◽  
Au Particle Size ◽  
Co Precipitation

The aim of the study was to establish the influence of a co-precipitation agent (i.e., NaOH–immediate precipitation; hexamethylenetetramine/urea–gradual precipitation and growth of nanostructures) on the properties and catalytic activity of as-synthesized Au-CeO2 nanocomposites. All catalysts were fully characterized with the use of XRD, nitrogen physisorption, ICP-OES, SEM, HR-TEM, UV-vis, XPS, and tested in low-temperature oxidation of benzyl alcohol as a model oxidation reaction. The results obtained in this study indicated that the type of co-precipitation agent has a significant impact on the growth of gold species. Immediate co-precipitation of Au-CeO2 nanostructures with the use of NaOH allowed obtainment of considerably smaller and more homogeneous in size gold nanoparticles than those formed by gradual co-precipitation and growth of Au-CeO2 nanostructures in the presence of hexamethylenetetramine or urea. In the catalytic tests, it was established that the key factor promoting high activity in low-temperature oxidation of benzyl alcohol was size of gold nanoparticles. The highest conversion of the alcohol was observed for the catalyst containing the smallest Au particle size (i.e., Au-CeO2 nanocomposite prepared with the use of NaOH as a co-precipitation agent).

Low temperature synthesis of ultrafine α-Al2O3 powder by a simple aqueous sol–gel process

2006 ◽  
Vol 32 (5) ◽  
pp. 587-591 ◽  
Author(s):  
Jiang Li ◽  
Yubai Pan ◽  
Changshu Xiang ◽  
Qiming Ge ◽  
Jingkun Guo
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Al2o3 Powder ◽  
Sol Gel Process ◽  
Α Al2o3

Screening of ceria-based catalysts for internal methane reforming in low temperature SOFC

2010 ◽  
Vol 157 (1-4) ◽  
pp. 263-269 ◽  
Author(s):  
Cyril Gaudillère ◽  
Philippe Vernoux ◽  
Claude Mirodatos ◽  
Gilles Caboche ◽  
David Farrusseng
Keyword(s):  
Low Temperature ◽  
Methane Reforming ◽  
Low Temperature Sofc
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