Hydrogen Production via Methane Decomposition Using Ni and Ni-Cu Catalysts Supported on MgO, Al2O3 and MgAl2O4

2010 ◽  
Vol 1279 ◽  
Author(s):  
José F. Pola ◽  
Miguel A. Valenzuela ◽  
Iván A. Córdova ◽  
J. A. Wang
Keyword(s):  
Bimetallic Catalysts ◽  
Fixed Bed ◽  
Decomposition Reaction ◽  
Methane Decomposition ◽  
Fixed Bed Reactor ◽  
Magnesium Aluminate ◽  
Alloy Formation ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support

AbstractNi (10%) and Ni-Cu (50 and 25%, respectively) catalysts supported on alumina, magnesia and magnesium aluminate were synthesized. The characterization was carried out by X-ray diffraction, nitrogen physisorption, temperature programmed-reduction, Raman spectroscopy and SEM. The catalysts were tested in the methane decomposition reaction using a tubular fixed bed reactor operated in the range of 500-580°C under atmospheric pressure. A higher activity was observed with the bimetallic catalysts supported on alumina and magnesium aluminate. These results were explained in terms of Ni-Cu alloy formation and weak metal-support interaction. In the case of monometallic catalysts, a strong metal-support interaction was detected, which revealed the lowest activity and stability compared with the bimetallic catalysts. The formed carbon was a combination of amorphous and graphite.

Catalytic Vapor Phase Nitroxidation of p-Xylene: a New Route for Synthesis of Terephthalic Acid and Poly(ethylene Terephthalate)

1992 ◽  
Vol 62 (10) ◽  
pp. 603-607
Author(s):  
Vandana Kala ◽  
R. Prasad ◽  
A. L. Sharma ◽  
J. Mathew
Keyword(s):  
Ethylene Terephthalate ◽  
Oxide Catalyst ◽  
Fixed Bed ◽  
Atomic Ratio ◽  
Fixed Bed Reactor ◽  
Effect Of Temperature ◽  
Poly Ethylene Terephthalate ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Poly Ethylene

We have examined catalytic transformation of p-xylene into terephthalonitrile with nitric oxide (NO) over an aluminium oxide-supported ferric oxide catalyst using a fixed bed reactor in a temperature range of 320-460°c under atmospheric pressure. We achieved a maximum conversion of 80% with an Al2O3:Fe2O3 catalyst having an Al:Fe atomic ratio of nearly 1:1 at a temperature of 360°c with a NO: p-xylene mole ratio of 54.60. We studied the effect of temperature and NO: p-xylene mole ratio on the conversion to terephthalonitrile. Using Mössbauer and IR spectra of the catalysts, we concluded that Al2O3 not only provides a larger surface for the iron oxide catalyst, but also increases its activity by interacting with Fe2O3 and upholds the theory of metal support interaction.

Selective Hydrogenation of Acetylene to Ethylene Over Nanosized Gold and Palladium Supported Catalysts

2020 ◽  
Vol 20 (9) ◽  
pp. 5800-5803 ◽  
Author(s):  
Gyeongmin Lee ◽  
Woon-Jo Jeong ◽  
Ho-Geun Ahn
Keyword(s):  
Selective Hydrogenation ◽  
Supported Catalysts ◽  
Fixed Bed ◽  
Raw Material ◽  
Fixed Bed Reactor ◽  
Selective Hydrogenation Of Acetylene ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Polyethylene Production ◽  
Ethylene Selectivity

Ethylene, the main raw material for polyethylene production, is a by-product produced by thermally decomposing naphtha and it contains a small amount of acetylene. The acetylene reacts as a permanent catalyst poison for the ethylene polymerization catalyst. In this study, we wanted to improve the acetylene conversion and the ethylene selectivity by selective hydrogenation of acetylene for removing acetylene contained in ethylene. Catalyst was prepared by loading nanosized gold (Au) and palladium (Pd) particles on support (Al2O3, TiO2). Deposition order Au and Pd particles was changed. The activity of the catalyst was investigated using a flow-typed fixed bed reactor under atmospheric pressure. Au and Pd particles deposited on TiO2 were oxidized to Au2O3 and PdO due to strong metal support interaction (SMSI). It was considered that the Au/Pd/Al2O3 catalyst was more active than the Pd/Au/Al2O3 catalyst due to the formation of the interface between Au particles and Pd particles (or support). But Pd/Au/Al2O3 catalyst is considered to have poor activity because Pd particles cover part of the interface between Au and the support. Au/Pd/Al2O3 catalyst showed the best catalytic activity, and acetylene conversion and ethylene selectivity were 100% and about 80% at 40 °C, respectively.

Sign in / Sign up

Export Citation Format

Share Document