Facile Synthesis and Catalytic Properties of Nickel-Based Mixed-Metal Oxides with Mesopore Networks from a Novel Hybrid Composite Precursor

Abstract

Facile synthesis of high-surface-area nickel-based mixed-metal oxides with interconnected mesopore networks through a novel layered double hydroxide/carbon (LDH/C) hybrid composite precursor route is successfully established. The starting LDH/C composite with interwoven framework structure is assembled by the crystallization of Ni/Al layered double hydroxide simultaneously accompanied by the carbonization of glucose under mild hydrothermal conditions, and subsequently, the formed composite is thermally decomposed to generate mesoporous nickel-based mixed-metal oxides after removal of the carbon. The materials have been characterized by X-ray diffraction (XRD), Fourier transform infrared technique (FT-IR), thermogravimetric and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen sorption measurements. The results elucidate that the specific surface area of calcined LDH/C composite at 450 °C can be as high as 288 m2 g−1, and decreases gradually with the calcination temperature. The effect of in situ generated carbon as template in the composite precursor is an essential factor to direct the formation of the high-surface-area mixed oxides with interconnected mesopore network. And the porosity of the obtained solids can be dominated by adjusting the calcination temperature of precursors. Furthermore, through catalytic investigations, these as-prepared high-surface-area Ni-based mixed oxides display excellent catalytic activities for the growth of carbon nanotubes in chemical vapor deposition reactions.

Highly Active Supported Pt Nanocatalysts Synthesized by Alcohol Reduction towards Hydrogenation of Cinnamaldehyde: Synergy of Metal Valence and Hydroxyl Groups

“…The synthesis of hydrotalcite (LDH) was carried out in a procedure similar to that reported previously . An aqueous solution of Mg(NO 3 ) 2 ⋅6 H 2 O and Al(NO 3 ) 3 ⋅9 H 2 O ([Mg 2+ ]=0.3 m , [Al 3+ ]=0.1 m ) and a mixed alkali solution of NaOH and Na 2 CO 3 ([OH − ]=1.6(Al 3+ +Mg 2+ ), CO 3 2− =2[Al 3+ ]) were rapidly mixed under high‐speed stirring within several tens of seconds.…”

Layered Double Hydroxides as Catalytic Materials: Recent Development

“…In addition, a novel Ni/Al-LDH/carbon (LDH/C) hybrid composite has also been used as catalyst precursor for the catalytic growth of CNTs [59]. The LDH/C composite with interwoven structure was prepared by the crystallization of Ni/Al-LDH simultaneously accompanied by the carbonization of glucose under mild hydrothermal conditions.…”

Mesoporous Nickel–Aluminum Mixed Oxide: A Promising Catalyst in Hydride‐Transfer Reactions

“…In particular, Ni‐ and Al‐based spinels are potential catalysts in reduction reactions 15. In the past, nickel–aluminum spinel oxides have been prepared by diverse synthetic routes through co‐precipitation to layered double hydroxides16 or sol–gel17 techniques. Tai and Guo have synthesized hexagonal nickel–aluminum oxide by the homogeneous precipitation method 18.…”