Selective Hydrogenation of 1,3-Butadiene on Pd–Ni Bimetallic Catalyst: From Model Surfaces to Supported Catalysts

The commercial introduction of Pt-Re supported catalysts to replace Pt alone on Al2O3 has brought improvements to naphtha reforming. The bimetallic catalyst can be operated continuously under conditions which lead to deactivation of the single metal catalyst by coke formation. Much disagreement still exists as to the exact nature of the bimetallic catalyst at a microscopic level and how it functions in the process so successfully. The overall purpose of this study was to develop the materials characterization tools necessary to study supported catalysts. Specifically with the Pt-Re:Al2O3 catalyst, we sought to elucidate the elemental distribution on the catalyst.

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Carbon Nanotunes Supported Pt and Pt-Ru Catalysts for Selective Hydrogenation of Citral: Effect of Promoters and Thermal Activation of Catalysts

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.584.229 ◽

2012 ◽

Vol 584 ◽

pp. 229-233 ◽

Cited By ~ 3

Author(s):

Sakunthala Angamuthu Ananthan ◽

Narayanan Vengidusamy ◽

Krishnamoorthy Giribabu ◽

Ranganathan Suresh

Keyword(s):

Selective Hydrogenation ◽

Bimetallic Catalyst ◽

Surface Group ◽

Inert Atmosphere ◽

Area Measurement ◽

Bet Surface Area ◽

Metallic State ◽

Environment Friendly ◽

Ru Catalysts ◽

Different Temperatures

MWCNT supported Pt, Ru, and Pt–Ru catalysts were prepared and reduced at two different temperatures, 375°C (LTR) and 675°C (HTR) for the selective hydrogenation of citral to the corresponding unsaturated alcohols (geraniol and nerol). The catalysts were characterized by BET Surface area measurement, TPD, SEM, EDAX, TEM, XRD and XPS. It was found that the XRD of Pt and Ru shows fcc and hcp crystalline structure respectively, which is uniformly dispersed with an average particles size of 3.5 nm and zero valence metallic state. The removal of acidic oxygen surface group is observed when heat- treatments in a inert atmosphere at 675°C were performed. The bimetallic catalyst of Pt-Ru/MWCNT (HTR) was found to afford remarkably high conversion levels (85%) and high selectivity (95%) provided that a thermal pretreatment was performed on the catalyst. These results can be rationalized in terms of electron transfer from the support to the metal. The catalysts are environment friendly and can be recycled for more than eight times.

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Selective hydrogenation of benzene to cyclohexene catalyzed by Ru supported catalysts

Catalysis Today ◽

10.1016/s0920-5861(00)00632-5 ◽

2001 ◽

Vol 66 (2-4) ◽

pp. 363-369 ◽

Cited By ~ 43

Author(s):

L Ronchin ◽

L Toniolo

Keyword(s):

Selective Hydrogenation ◽

Supported Catalysts

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Selective hydrogenation of α,β-unsaturated ketones to α,β-unsaturated alcohols on gold-supported catalysts

Journal of Catalysis ◽

10.1016/j.jcat.2003.11.003 ◽

2004 ◽

Vol 222 (2) ◽

pp. 348-356 ◽

Cited By ~ 92

Author(s):

C Milone

Keyword(s):

Selective Hydrogenation ◽

Supported Catalysts ◽

Unsaturated Ketones ◽

Unsaturated Alcohols

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Zeolite Supported Bimetallic Catalyst System: The Effect of Metal Loading for Catalytic Pyrolysis of Jatropha Residue

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.751.494 ◽

2017 ◽

Vol 751 ◽

pp. 494-499

Author(s):

Vituruch Goodwin ◽

Phanwatsa Amnaphiang ◽

Pimpreeya Thungngern ◽

Kong Kah Shin ◽

Parncheewa Udomsap ◽

...

Keyword(s):

Bimetallic Catalysts ◽

Catalytic Pyrolysis ◽

Bimetallic Catalyst ◽

Supported Catalysts ◽

Acid Sites ◽

One Step ◽

Step Loading ◽

Loading Sequence ◽

Xrd Patterns ◽

The One

Two transition metals were loaded on H-ZSM-5 zeolite to produce bimetallic zeolite supported catalysts for catalytic pyrolysis reaction. Ni and Co metal were loaded on H-ZSM-5 via wet impregnation method. The loading sequence was applied using one-step and two-step loading method. The different loading sequence affect surface properties of catalyst and catalytic activity in pyrolysis reaction. The bimetallic catalysts were prepared at Ni+Co metal loading content of 10+10 wt% (Ni:Co=1:1) to 10+20 wt% (Ni:Co=1:2 or 2:1). All bimetallic catalysts supported on H-ZSM-5 were calcined and characterized by X-ray Diffraction (XRD), Surface area analysis (BET) and Temperature Programmed Desorption of ammonia (NH3-TPD). The XRD patterns of bimetallic zeolite supported catalysts revealed that loading of two metals at high content affect crystalline structural of ZSM-5 support. All XRD patterns illustrated peaks characteristic of ZSM-5, cobalt oxide and nickel oxide. The NH3-TPD results showed number of acid sites of the catalyst which revealed that the acid sites of ZSM-5 support was weakened with transition metal added. The two-step loading of 10+20 wt% metals on ZSM-5 reduced the peak intensities of NH3 desorption due to the metal particles aggregate on acid sites of ZSM-5. The two-step 10+20 wt% bimetallic catalysts has the lowest surface acidity, followed by the one-step 10+20 wt%, the two-step 10+10 wt% and the one-step 10+10 wt% bimetallic catalysts, respectively. Jatropha residue was used for catalytic pyrolysis study. Jatropha residue and bimetallic catalyst was pyrolyzed at 500 °C in a pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The product vapor was analyzed by GC/MS for the different groups of organic products such as fatty acid, aldehydes, ketones, aliphatic hydrocarbons, aromatic hydrocarbons and nitrogen compounds. The product from catalytic pyrolysis of jatropha residue with bimetallic zeolite supported catalysts enhance deoxygenation reaction that resulted in high aliphatic and aromatic hydrocarbons product. The one-step loading at ratio Ni:Co = 1:1 (10+10 wt%) gave the highest hydrocarbons product yield at 57.81%.

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