Cobalt-aluminum mixed oxides prepared from layered double hydroxides for the total oxidation of benzene

Li, Dalin; Ding, Yuanyuan; Wei, Xiaofeng; Xiao, Yihong; Jiang, Lilong

doi:10.1016/j.apcata.2015.09.038

Cited by 45 publications

(16 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Due to the choice of this synthetic approach, which leads to carbonate‐intercalated LDHs, a subsequent two steps anion exchange reactions are mandatory for the purpose of this work . Furthermore, a well‐defined hexagonal morphology Co : Al ratio of 4 : 1 was synthesized for the first time using urea, in stark contrast with previous studies . It is worth pointing out that the preparation of some LDHs with a M 2+ : M 3+ ratio higher than 3 requires a specific control of the precipitation pH avoiding the phase segregation .…”

Section: Resultsmentioning

confidence: 99%

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Silva

Sanchis‐Gual

Carrasco

et al. 2020

Batteries & Supercaps

View full text Add to dashboard Cite

Layered double hydroxides (LDHs) are promising supercapacitor materials due to their wide chemical versatility, earth abundant metals and high specific capacitances. Many parameters influencing the supercapacitive performance have been studied such as the chemical composition, the synthetic approaches, and the interlayer anion. However, no systematic studies about the effect of the basal space have been carried out. Here, two‐dimensional (2D) CoAl‐LDHs were synthesized through anion exchange reactions using surfactant molecules in order to increase the interlayer space (ranging from 7.5 to 32.0 Å). These compounds exhibit similar size and dimensions but different basal space to explore exclusively the interlayer distance influence in the supercapacitive performance. In this line, Co : Al ratios of 2 : 1, 3 : 1 and 4 : 1 were explored. In all cases, an enhancement of the specific capacitance was observed by increasing the basal space, reaching ca. 50 % more than the value obtained from the less‐spaced 2 : 1 CoAl‐LDH (going from ca. 750 to 1100 F.g−1 at 1 A.g−1). This increment mainly occurs because of the increase in the electrochemical surface area (up to ca. 260 %) and the higher electrolyte diffusion. Interestingly, the best performance is achieved for the lowest Co : Al ratio (i. e. the highest Al content) revealing the important role of the electrochemically inert Al in the structure.

show abstract

Section: Resultsmentioning

confidence: 99%

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Silva

Sanchis‐Gual

Carrasco

et al. 2020

Batteries & Supercaps

View full text Add to dashboard Cite

show abstract

“…The Brunauer-Emmett-Teller (BET) surface areas slightly decrease with higher Zn/Ti molar ratios and the reason can be assigned to the replacement of Ti by Zn with a larger ion radius. 24 HPW/Zn-Ti-3 LDHs exhibited higher specific surface area (154 m 2 g -1 ) and pore volume (0.1922 cm 3 g -1 ) than others. This phenomenon may be attributed to the intercalation of PW anions and the exfoliation of LDH lamella during the ion-exchange process.…”

Section: Resultsmentioning

confidence: 88%

Synergistic Interactions between Ti–OOH and (PO4[WO2(O2)]4)3- of HPW/Zn-Ti Hydrotalcites: Efficient Heterogeneous Catalysts for the Epoxidation of Fatty Acid Methyl Ester

Wang¹,

Cheng²,

Zhou³

et al. 2017

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

A series of HPW/Zn-Ti layered double hydroxides (LDHs) were prepared by immobilizing phosphotungstic acid (HPW) on the Zn-Ti LDHs. Systematically characterizations were performed to elucidate their structure. These HPW/Zn-Ti LDHs hybrids were used as heterogeneous catalysts in the epoxidation of fatty acid methyl ester (FAMEs) with H 2 O 2. The HPW/Zn-Ti LDHs showed higher activity than bulk HPW and Zn-Ti LDHs. The conversion of FAMEs and the selectivity to epoxy fatty acid methyl ester (EFAME) were up to 90.6 and 86.0%, respectively. (PO 4 [WO 2 (O 2)] 4) 3was presumed to be the active site for the epoxidation in this work. The formed oxygen-donating intermediate Ti−OOH transferred oxygen free radicals to (PO 4 [WO 2 (O 2)] 4) 3in the catalytic process, accelerating the transfer of oxygen free radicals. Therefore, high catalytic activity of HPW/Zn-Ti LDHs is related to the potential synergistic interactions of Ti−OOH and PW anions.

show abstract

“…Owing to their superiority in recyclability and separation, heterogeneous catalysts have been becoming more attractive in practice. As a potential heterogeneous catalyst, layered double hydroxide (LDH) precursors have been extensively studied in environmentally-friendly reactions as catalysts [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. However, LDH precursors are seldom studied in organic synthetic procedures as acid catalysts.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanism of Acetalisation of Furfural to Furfural Diethyl Acetal with Ni–Al Layered Double Hydroxides Containing Lewis Acid Sites

Feng

Zou

et al. 2018

Progress in Reaction Kinetics and Mechanism

View full text Add to dashboard Cite

The nitrate form of Ni-Al layered double hydroxide (denoted as Ni-Al-NO 3-LDH) and the corresponding carbonate form (denoted as Ni-Al-CO 3-LDH) were tunably fabricated by the hexamethylenetetramine hydrolysis method. A catalytic behaviour investigation proved Ni-Al-CO 3-LDH to be an ineffective catalyst, while for Ni-Al-NO 3-LDH excellent catalytic activity and reusability were obtained, in the acetalisation of furfural to furfural diethyl acetal. Characterisation and analysis revealed that the appearance of Lewis acid sites in Ni-Al-NO 3-LDH was responsible for its excellent catalytic performance. The acquired kinetic parameters confirmed that this reaction was a first-order process and the apparent activation energy was 36.28 kJ mol-1 , which is in reasonable agreement with the theoretical result of 38.57 kJ mol-1. Additionally, apart from the typical Brønsted acid catalytic mechanism, a possible Lewis acid catalytic mechanism was probed theoretically.

show abstract

Cobalt-aluminum mixed oxides prepared from layered double hydroxides for the total oxidation of benzene

Cited by 45 publications

References 50 publications

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Synergistic Interactions between Ti–OOH and (PO4[WO2(O2)]4)3- of HPW/Zn-Ti Hydrotalcites: Efficient Heterogeneous Catalysts for the Epoxidation of Fatty Acid Methyl Ester

Kinetics and Mechanism of Acetalisation of Furfural to Furfural Diethyl Acetal with Ni–Al Layered Double Hydroxides Containing Lewis Acid Sites

Contact Info

Product

Resources

About