Investigating the impact of micropore volume of aminosilica functionalized SBA-15 on catalytic activity for amine-catalyzed reactions

Deshpande, Nitish; Chen, Jee-Yee; Kobayashi, Takeshi; Cho, Eun Hyun; Pineault, Hannah; Lin, Lu; Brunelli, Nicholas A.

doi:10.1016/j.jcat.2022.09.016

Cited by 8 publications

(5 citation statements)

References 62 publications

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“…This result indicates that the electrochemical detection performance of E-C-HP-ZIF is not only determined by the density of the amino group. Previous studies have suggested that surface functionalization of porous materials might lead to a narrowed pore size and even pore blocking. , Consistently, it is found that the ECSA of E-C-HP-ZIF-8 decreases when the grafted content of amino groups increases from 6.31 to 9.60 mmol/g (Figure d). Pore blocking by over-grafted amino groups would suppress the pore diffusion of HMIs.…”

Section: Resultssupporting

confidence: 78%

Amino-Functionalized Hierarchical Porous Carbon Derived from Zeolitic Imidazolate Frameworks for Ultrasensitive Electrochemical Sensing of Heavy Metals in Water

Yang

Xin

et al. 2023

ACS Appl. Mater. Interfaces

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Electrochemical sensing provides a feasible avenue to monitor heavy metal ions (HMIs) in water, whereas the construction of highly sensitive and selective sensors remains challenging. Herein, we fabricated a novel amino-functionalized hierarchical porous carbon by the template-engaged method using ZIF-8 as the precursor and polystyrene sphere as the template, followed by carbonization and controllable chemical grafting of amino groups for efficient electrochemical detection of HMIs in water. The amino-functionalized hierarchical porous carbon features an ultrathin carbon framework with a high graphitization degree, excellent conductivity, unique macro-, meso-, and microporous architecture, and rich amino groups. As a result, the sensor exhibits prominent electrochemical performance with significantly low limits of detection for individual HMIs (i.e., 0.93 nM for Pb2+, 2.9 nM for Cu2+, and 1.2 nM for Hg2+) and simultaneous detection of HMIs (i.e., 0.62 nM for Pb2+, 1.8 nM for Cu2+, and 0.85 nM for Hg2+), which are superior to most reported sensors in the literature. Moreover, the sensor displays excellent anti-interference ability, repeatability, and stability for HMI detection in actual water samples.

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Section: Resultssupporting

confidence: 78%

Amino-Functionalized Hierarchical Porous Carbon Derived from Zeolitic Imidazolate Frameworks for Ultrasensitive Electrochemical Sensing of Heavy Metals in Water

Yang

Xin

et al. 2023

ACS Appl. Mater. Interfaces

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“…Site quantification experiments have been applied to zeolite Beta, ,, other zeolite frameworks, and mesoporous catalysts such as amine-functionalized SBA-15. − For Sn-Beta, Harris et al used pyridine for titration experiments and complemented these results with FTIR using acetonitrile to identify open defect sites as the dominant sites for glucose isomerization, corroborating earlier findings. , Bates et al later expanded upon this work and determined that closed Sn sites were more active than open defect Sn sites for ethanol dehydration using similar techniques …”

Section: Introductionmentioning

confidence: 73%

Counting Sites in Lewis Acid Zeolite Sn-Beta: Connecting Site Quantification Experiments and Spectroscopy To Investigate the Catalytic Activity for the Alcohol Ring Opening of Epoxides

2023

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Sn-Beta is a promising catalyst for numerous reactions involved in biomass upgrading and fine chemical production, but it is complex with multiple types of active sites. The activity for Sn-Beta can be calculated on a per-site basis using site quantification experiments that involve adding a Lewis basic probe molecule, but it is not clear which types of sites are being titrated. Our work connects site quantification experiments with spectroscopic measurements to explain differences in the catalytic activity of materials crystallized for different amounts of time. For alcohol ring opening of epoxides, experiments reveal that Sn-Beta crystallized for 10 days (Sn-Beta-200-10d) is more active than Sn-Beta crystallized for 40 days (Sn-Beta-200-40d). These materials are investigated using site quantification experiments with three probestriethylamine, pyridine, or 2,6-lutidineto reveal the different fractions and types of sites. As the probe:Sn ratio is increased, these experiments result in two distinct slopes, indicating two distinct activities: high and low activity. The difference in activity between Sn-Beta-200-10d and Sn-Beta-200-40d can be attributed to the reduced fraction of high-activity sites. Although the two slopes have typically been assigned to open defect Sn sites for high activity and closed Sn sites for low activity, 15N NMR measurements of materials dosed with 15N-labeled pyridine contradict this assignment. Indeed, at low concentrations, pyridine adsorbs on both open defect and closed Sn sites whereas the low activity corresponds to pyridine binding to SnOH groups in addition to closed Sn sites. Overall, the identification of appropriate site quantification experiment parameters and the combination of these titrations with NMR techniques allows for the establishment of a synthesis–structure–activity relationship that has the potential to improve the performance of Sn-Beta.

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“…Of particular significance is that the low-thermal conductivity inherent to SBA-15 silica serves to impede the thermal conduction within epoxy matrix. [13][14][15] Additionally, the pore structure of SBA-15 can also reliably impede the release of heat and gas-phase species produced during combustion. 16 Meanwhile, SBA-15 has the characteristics of being easily surface modified and loading functional compound into its mesoporous pore channels.…”

Section: Introductionmentioning

confidence: 99%

“…Its unique properties make it a promising candidate for applications in adsorption and catalysis. Of particular significance is that the low‐thermal conductivity inherent to SBA‐15 silica serves to impede the thermal conduction within epoxy matrix 13–15 . Additionally, the pore structure of SBA‐15 can also reliably impede the release of heat and gas‐phase species produced during combustion 16 .…”

Section: Introductionmentioning

confidence: 99%

Construction of a hybrid flame retardant based on mesoporous silica for enhancing fire safety, smoke suppression, and mechanical properties of epoxy resins

Yue,

Shi,

Zheng

et al. 2024

J of Applied Polymer Sci

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In order to improve the fire safety of epoxy resins (EPs), the SBA‐15 based hybrid flame retardant (SNAZD) was synthesized via an organic–inorganic hybridization strategy of mesoporous silica SBA‐15. Relying on electrostatic interaction, the zinc amino‐tris‐(methylenephosphonate) (Zn‐ATMP) was successfully introduced into the pore channels of SBA‐15. Then, 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) was successfully loaded into the pores of SBA‐15 under vacuum. The results show that the EP composites with the 5%SNAZD sample (sample EP‐5%SNAZD) showed a LOI value of 30.9% and achieved the vertical burning V‐0 rating. In comparison to EP, the peak heat release rate, peak smoke production rate, and production rate of CO of EP‐3%SNAZD were reduced by 32.2%, 31.9%, and 20.0%, respectively. This is due to the presence of Si, P, N, and Zn elements in the SNAZD, which promoted the generation of a high yield of dense char residue and inhibited the release of toxic gasses. And the impact strength and flexural strength of EP‐1%SNAZD were increased by 19.5% and 15.6%, respectively, and the E' of EP‐5%SNAZD increased by 49.1% when compared with the neat EP. This work provides a general strategy for the design of mesoporous hybrid flame retardant and creates additional opportunities for applications of EP.

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Investigating the impact of micropore volume of aminosilica functionalized SBA-15 on catalytic activity for amine-catalyzed reactions

Cited by 8 publications

References 62 publications

Amino-Functionalized Hierarchical Porous Carbon Derived from Zeolitic Imidazolate Frameworks for Ultrasensitive Electrochemical Sensing of Heavy Metals in Water

Amino-Functionalized Hierarchical Porous Carbon Derived from Zeolitic Imidazolate Frameworks for Ultrasensitive Electrochemical Sensing of Heavy Metals in Water

Counting Sites in Lewis Acid Zeolite Sn-Beta: Connecting Site Quantification Experiments and Spectroscopy To Investigate the Catalytic Activity for the Alcohol Ring Opening of Epoxides

Construction of a hybrid flame retardant based on mesoporous silica for enhancing fire safety, smoke suppression, and mechanical properties of epoxy resins

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