Catalytic Performances of Bi-Metallic Ni-Co Catalysts in Acetic Acid Steam Reforming Reaction: Effect of Mg Incorporation

2019 ◽  
Vol 17 (6) ◽  
Author(s):  
Sahika Ozel Sahin ◽  
Huseyin Arbag ◽  
Nuray Oktar ◽  
Kirali Murtezaoglu
Keyword(s):  
Acetic Acid ◽  
Reaction Temperature ◽  
Steam Reforming ◽  
Sol Gel ◽  
Mesoporous Alumina ◽  
Coke Deposition ◽  
Ni Catalysts ◽  
Alumina Support ◽  
Co Catalysts ◽  
Catalytic Performances

Abstract In this study, mesoporous alumina supported bi-metallic Ni-Co catalysts were synthesized and catalytic performances were investigated in hydrogen production through steam reforming of acetic acid reaction. Mesoporous alumina support was synthesized using a sol-gel method and metals were co-impregnated into the structure of the catalyst. The physicochemical properties of the synthesized materials were characterized by XRD, N2 adsorption-desorption, SEM and TG-DT analysis. The activity test results showed that the bi-metallic 4Ni-1Co@SGA catalyst showed high and stable activity in steam reforming of acetic acid, giving a high H2 selectivity at 750 °C. Bi-metallic Ni-Co catalysts showed higher performance than monometallic Co catalyst, yielding less methane production and coke deposition. Co incorporation decreased activity of Ni catalysts at high reaction temperature of 750 °C in terms of AcOH conversion; however, improved the activity of Ni catalysts at low reaction temperature of 550 °C in terms of AcOH conversion and H2 Selectivity. Mg incorporation enhanced the coke resistance of the catalyst and further, among the bi- and tri-metallic catalysts, the lowest coke deposition was obtained over Mg incorporated 4Ni-1Co@SGA catalyst at 750 °C.

Steam Reforming of Glycerol for Hydrogen Production over Ni Catalysts Supported by CeO2-Al2O3 Xerogel

2015 ◽  
Vol 1101 ◽  
pp. 318-321 ◽  
Author(s):  
Krongthong Kamonsuangkasem ◽  
Supaporn Therdthianwong ◽  
Apichai Therdthianwong
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
High Surface ◽  
Sol Gel ◽  
Ni Catalyst ◽  
Ni Catalysts ◽  
Commercial Alumina ◽  
Gel Method ◽  
Sol Gel Method ◽  
Catalytic Stability

The Ni catalysts supported by CeO2-Al2O3xerogel were prepared by sol-gel method. The effect of hydrolysis ratio (R at 16.5 and 165) on CeO2-Al2O3textural properties and phase formation were investigated. The results revealed that the porous texture and the Ni crystalline phase can be controlled by adjusting the hydrolysis ratio. A high surface area and small Ni crystallite size were obtained by using the hydrolysis ratio of 16.5. For hydrogen production via glycerol steam reforming, the Ni catalyst supported on CeO2-Al2O3xerogel showed a better catalytic performance than that supported on commercial alumina. The promoted Ni catalyst supported on commercial alumina suddenly deactivated after first 12 h, whereas that on Al2O3xerogel performed the catalytic stability more than 20 h. This demonstrated that the catalyst prepared by sol-gel method is an interesting catalyst for using in the glycerol steam reforming because of the catalytic stability enhancement.

Support effect on structure and performance of Co and Ni catalysts for steam reforming of acetic acid

2016 ◽  
Vol 514 ◽  
pp. 182-191 ◽  
Author(s):  
Saioa Goicoechea ◽  
Elka Kraleva ◽  
Sergey Sokolov ◽  
Matthias Schneider ◽  
Marga-Martina Pohl ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Steam Reforming ◽  
Support Effect ◽  
Ni Catalysts ◽  
And Performance

scholarly journals Coke-Resistant Rh and Ni Catalysts Supported on γ-Al2O3 and CeO2 for Biogas Oxidative Steam Reforming

2020 ◽  
Vol 2 (1) ◽  
pp. 10
Author(s):  
Simona Renda ◽  
Antonio Ricca ◽  
Vincenzo Palma
Keyword(s):  
Steam Reforming ◽  
Fossil Fuels ◽  
Supported Catalysts ◽  
Coke Formation ◽  
Coke Deposition ◽  
Ni Catalysts ◽  
Ceo2 Sample ◽  
Active Metal ◽  
Metal Sintering ◽  
Selection Of

The depletion of fossil fuels and the growing concerns related to the environmental impact of their processing has progressively switched the interest towards the utilization of biomass-derived materials for a large variety of processes. Among them, biogas, which is a CH4-rich gas deriving from anaerobic digestion of biomass, has acquired a lot of interest as a feedstock for reforming processes. The main issue in employing biogas is related to the carbon deposition and active metal sintering, which are both responsible for the deactivation of the catalyst. In this work, bimetallic and monometallic Rh- and Ni-based formulations were supported on alumina and ceria with the aim of evaluating their activity and stability in biogas oxidative steam reforming. The Rh addition to the monometallic Ni/γ-Al2O3 formulation enhances its catalytic performances; nevertheless, this induces a higher coke deposition, thus suggesting a preferential coke formation on Rh sites. The initial activity of the CeO2-supported catalysts was found to be lower than the Al2O3-supported catalysts, but the 5%Ni/CeO2 sample showed a very good stability during the test and, despite the lower activity, 0.5%Rh-5%Ni/CeO2 did not show coke deposition. The results suggest that the promotion of Ni/CeO2 catalysts with other active metals could lead to the selection of a highly stable and performing formulation for biogas oxidative steam reforming.

Investigation of the SCR Catalyst Ce-V/TiO2

2009 ◽  
Vol 610-613 ◽  
pp. 274-280
Author(s):  
Fen Wang ◽  
Xiu Feng Ren ◽  
Jian Feng Zhu ◽  
Hai Bo Yang
Keyword(s):  
Reaction Temperature ◽  
Catalytic Reduction ◽  
Sol Gel ◽  
Selective Reduction ◽  
Catalytic Performance ◽  
Scr Catalyst ◽  
Nox Conversion ◽  
Selective Reduction Of Nox ◽  
Reduction Of Nox ◽  
Catalytic Performances

The Ce-V/TiO2 catalysts with the selective catalytic reduction (SCR) were prepared by method of Sol-gel and insuccation. The phase compositions, microstructures and specific surface area of the catalysts were analyzed by XRD, SEM and BET, respectively. The effect of CeO2 and V2O5 loading and reaction temperature on the catalytic performances of the as-prepared catalysts was investigated by using the selective reduction of NOx with NH3. The results showed all the as-prepared Ce-V/TiO2 catalysts were made up of nanometer grains. Compared to conventional TiO2 catalysts, the as-prepared Ce-V/TiO2 catalysts possessed better catalytic performance, higher adsorbability and larger area of contact with reactant, which is due to large quantity surface micropores. The NOx conversion of SCR over 5wt%Ce-10wt%V/TiO2 catalysts reached 96.2% at the reaction temperature of 500 oC.

Investigation and Preparation of the SCR Catalysts Nano-Co/Ce-V-Zr-TiO2

2010 ◽  
Vol 663-665 ◽  
pp. 1097-1102
Author(s):  
Xiu Feng Ren ◽  
Fen Wang ◽  
Yuan Zhou ◽  
Hong En Nian ◽  
Yu Na Pang ◽  
...  
Keyword(s):  
Reaction Temperature ◽  
Catalytic Reduction ◽  
Sol Gel ◽  
Selective Reduction ◽  
Catalytic Performance ◽  
Scr Catalysts ◽  
Selective Reduction Of Nox ◽  
Reduction Of Nox ◽  
Co Precipitation ◽  
Catalytic Performances

The nano-Co/Ce-V-Zr-TiO2 catalysts with the selective catalytic reduction (SCR) were prepared by methods of Sol-gel, impregnation (IM) and co-precipitation (CP). The phase compositions, microstructures and specific surface area of the catalysts were analyzed by BET, XRD and SEM, respectively. The effect of CeO2, CoO, V2O5 and V2O5 loading and reaction temperature on the catalytic performances of the as-prepared catalysts was investigated by using the selective reduction of NOx with NH3. The results showed all the as-prepared Co/Ce-V-Zr-TiO2 catalysts were made up of nanometer grains. Compared to conventional TiO2 catalysts, the as-prepared Co/Ce-V-Zr-TiO2 catalysts possessed better catalytic performance, higher adsorbability and larger area of contact with reactant, which is due to large quantity surface micropores. The NOx conversion of SCR over 8 wt%Co/Ce-V-Zr-TiO2 catalysts reached 98.3% at the reaction temperature of 550 oC. Furthermore, the activity of Co/Ce-V-Zr-TiO2 catalysts were improved by the Co loading, however, further increasing the Co loading lead to decrease the catalysis activity.

scholarly journals Catalytic Steam Reforming of Biomass-Derived Acetic Acid over Two Supported Ni Catalysts for Hydrogen-Rich Syngas Production

ACS Omega ◽  
2019 ◽  
Vol 4 (8) ◽  
pp. 13585-13593 ◽  
Author(s):  
Peng Fu ◽  
Andong Zhang ◽  
Shan Luo ◽  
Weiming Yi ◽  
Song Hu ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Steam Reforming ◽  
Ni Catalysts ◽  
Syngas Production ◽  
Supported Ni Catalysts ◽  
Catalytic Steam Reforming ◽  
Supported Ni

scholarly journals Effects of TiO2 structure and Co addition as a second metal on Ru-based catalysts supported on TiO2 for selective hydrogenation of furfural to FA

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Weerachon Tolek ◽  
Natdanai Nanthasanti ◽  
Boontida Pongthawornsakun ◽  
Piyasan Praserthdam ◽  
Joongjai Panpranot
Keyword(s):  
Strong Interaction ◽  
Selective Hydrogenation ◽  
Sol Gel ◽  
Reaction Conditions ◽  
Hydrogenation Activity ◽  
Co Catalysts ◽  
Alloying System ◽  
Mild Conditions ◽  
Co Addition ◽  
Catalytic Performances

AbstractThe TiO2 supported Ru-based catalysts were prepared with 1.5 wt% Ru and 0–0.8 wt% Co on various TiO2 (anatase, rutile, P-25, and sol–gel TiO2) and studied in the liquid-phase selective hydrogenation of furfural to furfuryl alcohol (FA) under mild conditions (50 °C and 2 MPa H2). The presence of high anatase crystallographic composition on TiO2 support was favorable for enhancing hydrogenation activity, while the strong interaction between Ru and TiO2 (Ru–TiOx sites) was required for promoting the selectivity to FA. The catalytic performances of bimetallic Ru–Co catalysts were improved with increasing Co loading due to the synergistic effect of Ru–Co alloying system together with the strong interaction between Ru and Co as revealed by XPS, H2-TPR, and TEM–EDX results. The enhancement of reducibility of Co oxides in the bimetallic Ru–Co catalysts led to higher hydrogenation activity with the Ru–0.6Co/TiO2 catalyst exhibited the best performances in FA selective hydrogenation of furfural to FA under the reaction conditions used.

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