Investigating the role of framework topology and accessible active sites in silicoaluminophosphates for modulating acid-catalysis

Potter, Matthew E.; Kezina, Julija; Bounds, Richard; Carravetta, Marina; Mezza, Thomas M.; Raja, Robert

doi:10.1039/c8cy01370e

Cited by 19 publications

(46 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…MP-SAPO-5 was synthesised according to our previous work [17], giving the expected phase-pure, crystalline, microporous AlPO-5 framework (Fig. 1 and Figures S1–S3 and Table S2, Supporting Information File 1).…”

Section: Resultsmentioning

confidence: 99%

The influence of porosity on nanoparticle formation in hierarchical aluminophosphates

Potter¹,

Riley²,

Oakley³

et al. 2019

Beilstein J. Nanotechnol.

Self Cite

View full text Add to dashboard Cite

In this work we explore the deposition of gold onto a silicoaluminophosphate, using a variety of known nanoparticle deposition techniques. By comparing the gold particles deposited on a traditional microporous aluminophosphate, with an analogous hierarchical species, containing both micropores and mesopores, we explore the influence of this dual porosity on nanoparticle deposition. We show that the presence of mesopores has limited influence on the nanoparticle properties, but allows the system to maintain porosity after nanoparticle deposition. This will aid diffusion of reagents through the system, allowing continued access to the active sites in hierarchical systems, which offers significant potential in catalytic oxidation/reduction reactions.

show abstract

Section: Resultsmentioning

confidence: 99%

The influence of porosity on nanoparticle formation in hierarchical aluminophosphates

Potter¹,

Riley²,

Oakley³

et al. 2019

Beilstein J. Nanotechnol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Specifically we compare three known nanoparticle preparation methods; Incipient Wetness (IW), Wet-Impregnation (WI) and Ammonia Evaporation (AE) on the typical microporous (MP-SAPO-5) and corresponding hierarchically porous system (HP-SAPO-5). [15,16] MP-SAPO-5 was synthesised according to our previous work, [17] giving the expected phase-pure, crystalline, microporous AlPO-5 framework (Figures 1A, S1-S3 and Table S2). Modifying the synthesis procedure by adding a small quantity of DMOD (Table S1) into the hydrothermal gel (HP-SAPO-5) preserved the phase-purity, as only AlPO-5 features are present ( Figure S1).…”

Section: Resultsmentioning

confidence: 99%

The influence of porosity on nanoparticle formation in hierarchical aluminophosphates

Potter¹,

Riley²,

Oakley³

et al. 2019

Preprint

Self Cite

View full text Add to dashboard Cite

The ability to tailor metal active sites is increasingly important, due to the superior advantages in nanoparticle utilisation in a diverse range of fields. One of the key factors that determines the properties of immobilised nanoparticles is metal-support interactions, thus the nature of the support is crucial for optimising nanoparticle design for a range of catalytic applications. In this work we explore the deposition of gold onto a silicon-doped aluminophosphate, using a variety of known nanoparticle deposition techniques. By comparing the gold particles deposited on a traditional microporous aluminophosphate, with an analogous hierarchical species, containing both micropores and mesopores, we explore the influence of this dual porosity on nanoparticle deposition. We show that the presence of mesopores has limited influence on the nanoparticles properties, but allows the system to maintain porosity post-deposition. This will aid diffusion of reagents through the system, allowing continued access the active sites in hierarchical systems, which offers significant potential in catalytic oxidation reactions.

show abstract

“…[41] Based on the 1 HM AS NMR data, the second desorption peak of MP SAPO-37 was assigned to the loss of ammonia from the more acidic, bridging Brønsted sites (from Ty pe II substitution of P V for Si IV ). [13,14,42] Although thermo-desorption of ammonia from HP SAPO-37 occurred with as ingle peak, it was evidently ac onvolution of multiple desorption processes.N otably,t he desorption of ammonia from the bridging Brønsted sites occurred % 45 8 8Cl ower in HP SAPO-37 than MP SAPO-37, which revealed that the framework acidity was moderated by the siliceous mesopore network. [43][44][45] Nevertheless,H P SAPO-37 also contained sites that were considerably more acidic than those found in MP SAPO-37, as evidenced by the desorption peak in the region of 400 8 8C.…”

Section: Temperature-programmed Desorptionmentioning

confidence: 99%

Probing the Design Rationale of a High‐Performing Faujasitic Zeotype Engineered to have Hierarchical Porosity and Moderated Acidity

et al. 2020

Self Cite

View full text Add to dashboard Cite

Porosity and acidity are influential properties in the rational design of solid-acid catalysts.P robing the physicochemical characteristics of an acidic zeotype framework at the molecular level can provide valuable insights in understanding intrinsic reaction pathways,f or affording structure-activity relationships.H erein, we employ av ariety of probe-based techniques (including positron annihilation lifetime spectroscopy(PALS), FTIR and solid-state NMR spectroscopy) to demonstrate howahierarchical design strategy for afaujasitic (FAU)z eotype (synthesized for the first time,v ia as ofttemplating approach,w ith high phase-purity) can be used to simultaneously modify the porosity and modulate the acidity for an industrially significant catalytic process (Beckmann rearrangement). Detailed characterization of hierarchically porous (HP) SAPO-37 reveals enhanced mass-transport characteristics and moderated acidity,w hichl eads to superior catalytic performance and increased resistance to deactivation by coking,c ompared to its microporous counterpart, further vindicating the interplay between porosity and moderated acidity.

show abstract

Investigating the role of framework topology and accessible active sites in silicoaluminophosphates for modulating acid-catalysis

Abstract: Framework topology and the acid sites significantly influence the Beckmann rearrangement, affecting the design of solid-acid catalysts.

Cited by 19 publications

References 68 publications

The influence of porosity on nanoparticle formation in hierarchical aluminophosphates

The influence of porosity on nanoparticle formation in hierarchical aluminophosphates

The influence of porosity on nanoparticle formation in hierarchical aluminophosphates

Probing the Design Rationale of a High‐Performing Faujasitic Zeotype Engineered to have Hierarchical Porosity and Moderated Acidity

Contact Info

Product

Resources

About