Facets Engineering on Catalysts

Pan, Jian

doi:10.1002/9783527813599.ch2

Cited by 1 publication

(3 citation statements)

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“…29 Catalyst structures can be settled to promote efficient adsorption and/or beneficial coordination of adsorbates. 30 These processes are substantially controlled by the organization and coordination of surface atoms, and also by the surface density of states related to the various facets. Pt, for instance, has two types of flat surfaces: the Pt [111] facet (hexagonal surface) with six nearest neighbors per surface atom, and the Pt [100] facet (square surface) with four nearest neighbors per surface atom.…”

Section: Heterogeneous Catalysts In the Nanoscale Regimementioning

confidence: 99%

“…The atomic composition of a metal catalyst’s surface determines its selectivity and activity . Catalyst structures can be settled to promote efficient adsorption and/or beneficial coordination of adsorbates . These processes are substantially controlled by the organization and coordination of surface atoms, and also by the surface density of states related to the various facets.…”

Section: Heterogeneous Catalysts In the Nanoscale Regimementioning

confidence: 99%

“…These processes are substantially controlled by the organization and coordination of surface atoms, and also by the surface density of states related to the various facets. Pt, for instance, has two types of flat surfaces: the Pt [111] facet (hexagonal surface) with six nearest neighbors per surface atom, and the Pt [100] facet (square surface) with four nearest neighbors per surface atom. , Other authors demonstrated that while the hexagonal surface was seven times more active than the square surface in the aromatization of n -pentane to toluene, the square surface was four to seven times more active in the isobutane to n -butane isomerization reaction . Careful tuning of surface facets could synergistically improve catalytic performance in regarding selectivity and reactivity.…”

Section: Heterogeneous Catalysts In the Nanoscale Regimementioning

confidence: 99%

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Recent Impacts of Heterogeneous Catalysis in Biorefineries

Ahorsu

Constantí

Medina

2021

Ind. Eng. Chem. Res.

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Renewable biofuel will play a critical role in our energy future by lowering our dependency on fossil fuel because energy shortage is not a remote possibility but is on the horizon. Biofuels are a valuable substitute due to the enormous transportation infrastructure currently in place to support their use and distribution. Apparently, efficient production processes are being developed for both drop-in fuels and fuel additives. Hydrodeoxygenation (HDO) over heterogeneous catalysts provides paths to platform compounds into a range of building block chemicals; however, the selectivity of these reactions is limited due to identical functional groups in intermediate compounds. HDO reactions are complex, as they occur at multiple sites of solid catalysts. Catalyst stability and selectivity toward desirable products are crucial in the design of HDO catalysts. In addition, reduced surface area and phase transformation of catalyst supports could occur with the HDO process. In this review, the exact basis of heterogeneous catalysis is introduced. After that, an insight into how the catalyst’s size, porosity, facets, edges, and corners affect selectivity and yields during HDO is provided. Recent strategies in developing heterogeneous catalytic systems to overcome harsh reactions conditions associated with HDO are discussed.

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