Production of COX Free Hydrogen by Catalytic Decomposition of Methane Over Ni/HY Catalysts

Abstract

In this present paper, we report catalytic decomposition of methane over Ni/HY catalysts, with varying Ni loading at 550°C and atmospheric pressure. The relationships between catalyst performance and characterization of the fresh and used form of catalysts are discussed from the data obtained by scanning electron microscopy, X-ray diffraction analysis, temperature programmed reduction, O 2 pulse chemisorption and carbon elemental analyses. It is observed that, the catalytic activity of Ni/HY catalysts is high at initial stages and gradually decreased with time and finally deactivated completely. The yield of hydrogen and carbon nanofibers is strongly dependent on Ni loading. It is found that 20 wt% Ni/HY catalyst showed higher hydrogen yield over the other loadings.

Pure H2 Production by Decomposition of Methane Over Ni Supported on Hydroxyapatite Catalysts

“…The shiny patches in the deactivated catalysts are probably due to Ni particle occupied at the tip of the carbon nanofibers. Similar observations are reported during catalytic decomposition of methane over supported Ni catalysts [7][8][9].…”

“…This is noticed from XRD analysis and the carbon estimations performed for deactivated samples recovered after the reaction. The performance of supported Ni catalysts for CH 4 decomposition strongly depends upon the metal-support interaction, Ni loading and also the particle size [8]. In the present investigation, a maximum of 550 mmol H 2 /g-cat is observed over 30 wt% Ni/HAp catalyst.…”

“…The direct catalytic cracking of hydrocarbons especially methane into hydrogen and carbon is an attractive alternative method due to growing importance on the production of pure H 2 as well as the formation of useful compounds such as carbon nanotubes (CNT) and carbon nanofibers (CNF) [2][3][4][5][6] thus the catalytic decomposition of methane (CDM) has become a topical subject [7][8][9][10][11][12][13].…”

Influence of La on reduction behaviour and Ni metal surface area of Ni–Al2O3 catalysts for COx free H2 by catalytic decomposition of methane

“…This can be possibly explained by the formation of large cluster of segregated La 2 O 2 CO 3 species as observed from XRD analysis (Fig. 1a) [13,20]. At lower La loadings graphite carbon and metallic Ni phases are found.…”

Development of Methane Decomposition Catalysts for COx Free Hydrogen

“…The Ni/HY samples are prepared by incipient wetness impregnation method. The obtained methane decomposition activity (at 550°C and ambient pressure) results are summarized in Table 1, along with Ni crystallite size (calculated from XRD profiles), H 2 uptakes (from TPR spectra), O 2 uptakes (from high temperature O 2 pulse chemisorption), and H 2 yields are calculated from GC analysis [21]. It appeared that the crystallite size of Ni increased with increasing Ni loading.…”