Copper Supported on Hybrid C@SiO₂ Hollow Submicron Spheres as Active Ethanol Dehydrogenation Catalyst

Abstract

The dehydrogenation of ethanol to acetaldehyde (DHEA) is an environmentally benign alternative for synthetic chemistry and for the fine chemical industry. The key is to design Cu‐based catalysts with certain structures to obtain high acetaldehyde selectivity. Herein, hybrid C@SiO2 hollow submicron spheres were designed and synthesized using a confined pyrolysis method. This hybrid structure processes a layer of carbon‐silica hybrid shell. After loading the Cu, the Cu/C@SiO2 catalyst exhibited 36.1% conversion of ethanol and ∼99% acetaldehyde selectivity at 260 °C. The hybrid support combined the two favorable properties of carbon and silica and thus improving both selectivity and stability.

Tailoring the Surface Structure of Silicon Carbide Support for Copper Catalyzed Ethanol Dehydrogenation

“…To gain deep comprehension of the distinction on product selectivity, kinetic measurements were conducted and the results were shown in Figure a and c. The apparent activation energies of the Cu/SiC, Cu/SiO 2 /SiC and Cu/C/SiC catalysts are 66.7, 64.9 and 67.7 kJ mol −1 respectively, indicating that the active sites among the catalysts are almost identical. Since the dehydrogenation reaction has been proven to be structure insensitive,, we deduce that the surface nature of the supports is the dominant factor which plays a role in influencing the selectivity of the acetaldehyde. To confirm our deduction, the effect of residence time on ethanol conversion and product selectivity over the three catalysts was investigated (Figure c).…”

A State‐of‐the‐Art Heterogeneous Catalyst for Efficient and General Nitrile Hydrogenation

“…[7] Notably,s uch materials have been scarcely exploredi nc hemical catalysis. [8] In this respect, we envisioned the exploitation of new biomass-derived carbon-metal/metal oxide composites for sustainable redox transformations. Inspired by the preparation of chitosan-derived metal nanoparti-cles, [4][5][6] as election of potentialc atalytic materials was prepared.…”

Ethanol Dehydrogenation to Acetaldehyde over Co@N-Doped Carbon

“…As an alternative route, gaining significant interest, a number of studies have used catalysts based on readily available, inexpensive transition metals deposited on a lowacidity carrier. In line with that approach, activated carbon as itself [6][7][8][9][10][11], and much more successfully, carbon doped with MoO 3 or Cu, have shown high catalytic performances in the selective non-oxidative dehydrogenation of ethanol to acetaldehyde [12][13][14][15][16][17]. For example, conversion of ethanol over Cu deposited on activated carbon has attained a level of 65% with 96% selectivity to acetaldehyde at 350 • C under gas flow reaction conditions [15], while the use of Cu deposited on mesoporous carbon appeared even more effective, affording acetaldehyde in a 79% yield at 280 • C [13].…”