Kinetic and Raman spectroscopic study on catalytic characteristics of carbon blacks in methane decomposition

Solid Phase Extraction to On-Line Preconcentrate Trace Cadmium Using Chemically Modified Nano-Carbon Black with 3-Mercaptopropyltrimethoxysilane

“…The relative intensity of the bands D and G (I D /I G ) can be used to evaluate the microstructure of the carbonaceous materials. 43 From Figure 4, the (I D /I G ) ratio were found to be 0.37 for CB, 0.25 for oxidized CB and 0.23 for 3-MPTMS-grafted CB, thus indicating an increase in the order of the graphitic structure of CB after oxidation and grafting process. 36 The broad G' peak (around 2450 cm −1 ) presents in the 3-MPTMS-grafted CB can be assigned to an overtone and is due to D + G phonons contribution and this band shows evidence of the set 3-MPTMS, suggesting that treatment led to higher order.…”

Variation in Catalytic Activity of Carbon Black during Methane Decomposition: Active Site Estimations from Surface Structural Characteristics

“…The mass ratios m dep /m CB that determined the boundaries between stages (1) and (2) and between (2) and (3) were 0.23 and 0.79, respectively. In our previous study [12], we determined that the reaction order was 0.62, and the activation energy of 199-204 kJ/mol was nearly constant throughout the stages (1)-(3). The relative value of the modification coefficient was evaluated from the rate constant: f/f (2-3) equals k p /k p, (2)(3) at constant temperatures, where the subscript (2-3) denotes the value at the boundary between stages (2) and (3).…”

“…A commercial color CB, SB905 (Asahi Carbon, Japan), was employed in this study because it exhibits a relatively broad range of the initial deactivation stage in terms of the reaction time [12], which would make it easy to investigate the initial variation in catalytic activity. The primary particle diameter was 15 nm.…”

“…The use of carbonaceous materials as catalysts in methane decomposition has also been investigated [1,2,[5][6][7][8][9][10][11][12]. Carbon catalysts offer several advantages over metal catalysts, such as resistance to high temperatures, tolerance to sulfur and other potentially harmful impurities in the feedstock [2], and lower cost [8].…”

“…Recently, we have discovered that the mass ratio of deposited carbon to CB is an important parameter for representing the variation in the catalytic activity of CB during the reaction, and that the activation energy is constant despite the varying reaction rate [12]. The constant activation energy suggests that the mechanism of catalytic decomposition, namely, the reaction at the edge sites and defects in graphitic sheets, is invariant during the reaction.…”