Efficient Preparation and Catalytic Activity of MgO(111) Nanosheets

Zhu, Kake; Hu, Juncheng; Kübel, Christian; Richards, Ryan M.

doi:10.1002/anie.200602393

Cited by 170 publications

(161 citation statements)

References 33 publications

Supporting

Mentioning

151

Contrasting

Unclassified

Order By: Relevance

“…For methanol exposures >1000 L a fourth C 1s state was observed at 286. on Pd surfaces is reported ~0.8 eV higher than that for methoxy functions, [37] consistent with Fig. 3a, hence we propose initial dissociative adsorption of methanol over NanoMgO-700 and occupancy of defect, step and edge sites by resulting methoxy species.…”

Section: A) B)supporting

confidence: 90%

“…[36] This poor performance has driven the development of new MgO architectures and presentation formats which afford higher surface areas in an attempt to improve its reactivity towards various catalytic processes. [37][38][39] Although the general consensus is that the efficacy of solid base catalysts in triglyceride transesterification is favoured by stronger basic sites at the catalyst surface, [34,40] the influence of surface basicity upon catalytic activity remains poorly understood, hampering further catalyst optimisation and the commercial exploitation of MgO in biodiesel production. [66] and formic acid [66] at room temperature.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

The surface chemistry of nanocrystalline MgO catalysts for FAME production: An in situ XPS study of H2O, CH3OH and CH3OAc adsorption

et al. 2016

View full text Add to dashboard Cite

An in situ XPS study of water, methanol and methyl acetate adsorption over as-synthesised and calcined MgO nanocatalysts is reported with a view to gaining insight into the surface adsorption of key components relevant to fatty acid methyl esters (biodiesel) production during the transesterification of triglycerides with methanol. High temperature calcined NanoMgO-700 adsorbed all three species more readily than the parent material due to the higher density of electron-rich (111) and (110) facets exposed over the larger crystallites. Water and methanol chemisorb over the NanoMgO-700 through the conversion of surface O 2-sites to OH -and coincident creation of Mg-OH or Mg-OCH3 moieties respectively. A model is proposed in which the dissociative chemisorption of methanol occurs preferentially over defect and edge sites of NanoMgO-700, with higher methanol coverages resulting in physisorption over weakly basic (100) facets. Methyl acetate undergoes more complex surface chemistry over NanoMgO-700, with C-H dissociation and ester cleavage forming surface hydroxyl and acetate species even at extremely low coverages, indicative of preferential adsorption at defects.Comparison of C 1s spectra with spent catalysts from tributyrin transesterification suggest that ester hydrolysis plays a key factor in the deactivation of MgO catalysts for biodiesel production.

show abstract

Section: A) B)supporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

The surface chemistry of nanocrystalline MgO catalysts for FAME production: An in situ XPS study of H2O, CH3OH and CH3OAc adsorption

et al. 2016

View full text Add to dashboard Cite

show abstract

“…For example, Parvulescu and Richards demonstrated the impact of the different MgO crystal facets upon the transesterification of sunflower oil by [115] versus (111) terminated nanosheets [116]. Chemical titration reveals that both morphologies possess two types of base sites, with the nanosheets exhibiting well-defined, medium-strong basicity consistent with their uniform exposed facets and which confer higher FAMe yields during sunflower oil transesterification.…”

Section: Heterogeneously Catalysed Routes To Biodieselmentioning

confidence: 99%

Catalysing Sustainable Fuel and Chemical Synthesis

Lee¹

2015

Advanced Biofuels

View full text Add to dashboard Cite

Concerns over the economics of proven fossil fuel reserves, in concert with government and public acceptance of the anthropogenic origin of rising CO 2 emissions and associated climate change from such combustible carbon, are driving academic and commercial research into new sustainable routes to fuel and chemicals. The quest for such sustainable resources to meet the demands of a rapidly rising global population represents one of this century's grand challenges. Here, we discuss catalytic solutions to the clean synthesis of biodiesel, the most readily implemented and low cost, alternative source of transportation fuels, and oxygenated organic molecules for the manufacture of fine and speciality chemicals to meet future societal demands.

show abstract

“…One example, an MgO(111) nanosheet structure, is discussed here. In MgO, a typical ionic solid with the rock salt structure, the (100) (111) as the major surface [178]. Figure 11 shows TEM images and the structure of the MgO (111) groups.…”

Section: Surface Control and Activity Of Nanostructured Catalystsmentioning

confidence: 99%

Self-assembled materials for catalysis

Zhu

Wang

2009

Nano Res.

Self Cite

View full text Add to dashboard Cite

The purpose of this review is to highlight developments in self-assembled nanostructured materials (i.e., mesoporous and nanoparticle-based materials) and their catalytic applications. Since there are many available reviews of metal-based nanoparticles as catalysts, this review will mainly focus on self-assembled oxide-based catalytic materials. The content includes: (1) design and synthetic strategies for self-assembled mesoporous catalysts, (2) polyoxometalate (POM)-based nanocatalysts, (3) dendrimer-based nanocatalysts, and (4) shaped nanomaterials and catalytic applications. We show that controlled assembly of molecules, crystalline seeds, and nano building blocks into organized mesoscopic structures or controlled morphologies is an effective approach for tailoring porosities of heterogeneous catalysts and controlling their catalytic activities.

show abstract

Efficient Preparation and Catalytic Activity of MgO(111) Nanosheets

Cited by 170 publications

References 33 publications

The surface chemistry of nanocrystalline MgO catalysts for FAME production: An in situ XPS study of H2O, CH3OH and CH3OAc adsorption

The surface chemistry of nanocrystalline MgO catalysts for FAME production: An in situ XPS study of H2O, CH3OH and CH3OAc adsorption

Catalysing Sustainable Fuel and Chemical Synthesis

Self-assembled materials for catalysis

Contact Info

Product

Resources

About