Correlation between Structural and Catalytic Properties of Copper Supported on Porous Alumina for the Ethanol Dehydrogenation Reaction

Abstract

Carbon nanofibers (CNFs) were functionalized with aryl sulfonic acid groups using in situ diazonium coupling. The use of diazonium coupling yielded an acidic carbon material, in which the introduced acidic groups are readily accessible to the triglyceride substrate. The material is an efficient catalyst for the transesterification of triolein and methanol, outperforming conventional sulfonated carbons in both stability and activity per acid site. Upon comparing CNFs with varying degrees of functionalization, a linear correlation between sulfonic acid sites and catalytic performance was found.

In Situ XAS Study on Growth of PVP‐Stabilized Cu Nanoparticles

“…Cassinelli et al. have employed MCR‐ALS to TR‐XAS data for monitoring the activation of copper‐alumina catalyst and ethanol dehydrogenation reaction,. They were successful in determining copper speciation during reduction of the catalyst and also obtained an in‐depth information about the reduction process.…”

Catalytic performance of texturally improved Al–Mg mixed oxides derived from emulsion-synthesized hydrotalcites

“…Pluronic P123 is a common non-ionic triblock polymer used in the synthesis of several mesoporous materials that consists of hydrophilic polyethylene oxide chains and hydrophobic polypropylene oxide chains. [15][16][17][21][22][23][24][25][26] They are very useful in the synthesis of mesoporous materials because in polar solvents they form micelles that act as template of pores during the condensation of metallic oxides around them, by means of hydrogen bonds with the oxygen atoms of the poloxamer chains. In the emulsion-mediated synthesis, the Pluronic P123 plays an important role by interfering in the kinetic stability of the emulsion droplets by placing between the polar and nonpolar interface.…”

“…The amount of desorbed NH 3 was lower for pure MgO (Al0.0-P60), but the strong acid nature increased considerably with higher proportions of aluminum, in accordance to previously reported results. 3,[21][22][23][24][25] The use of the SDA decreased the quantity and strength of acid sites associated with residual hydroxyl groups, varying signicantly from 0.78 to 0.51 mmol g À1 for Al0.5-ref, Al0.5-P0, and Al0.5-P60. Hydroxyl groups contributed to the strong acidity of the material, 26 while weak acid sites were associated with Mg 2+ -O 2À -Al 3+ cations in the mixed oxide framework.…”

A Highly Porous Carbon Support Rich in Graphitic‐N Stabilizes Copper Nanocatalysts for Efficient Ethanol Dehydrogenation

“…Ethanol can be converted into acetaldehyde and hydrogen through a direct dehydrogenation protocol, usually named the dehydrogenation of ethanol to acetaldehyde process (DHEA) . This process is more promising than oxidation dehydrogenation of ethanol, which produces CH 3 COOH, CO 2 , CH 4 , and other byproducts . Compared with the current industrial Wacker process, which involves the use of PdCl 2 and CuCl 2 as catalysts in strong acidic and corrosive solutions, the DHEA process may become an important alternative for the production of acetaldehyde .…”

“…[3] This process is more promising than oxidationd ehydrogenation of ethanol, which produces CH 3 COOH,C O 2 ,C H 4 ,a nd other byproducts. [4][5][6][7] Compared with the current industrial Wacker process, which in-volves the use of PdCl 2 and CuCl 2 as catalysts in strong acidic and corrosive solutions, [8] the DHEA process may become an important alternative for the productiono fa cetaldehyde. [9] Acetaldehyde is an important bulk intermediate in the production of other chemicals [10] and the hydrogen byproduct can be furtheru sed in hydrogenation reactions or to provide energy for fuel cells.…”