n-Heptane isomerization over mesostructured silica nanoparticles (MSN): Dissociative-adsorption of molecular hydrogen on Pt and Mo sites

Fatah, N.A.A.; Triwahyono, Sugeng; Jalil, Aishah Abdul; Ahmad, Arshad; Abdullah, Tuan Amran Tuan

doi:10.1016/j.apcata.2016.02.026

Cited by 45 publications

(22 citation statements)

References 49 publications

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“…The isotherm of N 2 physisorption isotherms, conducted at a relative pressure P/P 0 between 0.3-1.0 for as-prepared samples, demonstrates a type IV curve with an H1 hysteresis, confirming the existence of mesoporous material, as stated in IUPAC classification. 31,32 Such a type of isotherm pattern was also reported by previous studies for various mesoporous silica-based materials. 19,33,34 The up-steps at relative pressures of P/P o = 0.3-0.4 and P/P o = 0.9-1.0 showed N 2 capillary condensed in the intra-and interparticle mesopores, respectively.…”

Section: Catalyst Characterization Morphological and Structural Analysessupporting

confidence: 83%

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Zakaria

Hassan

Ibrahim

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND Heterogeneous photocatalysis has been demonstrated to be a promising alternative to treating emerging pollutants in wastewater. Phenol, an extremely toxic substance among existing pollutants, can cause long‐term unintended effects when improperly disposed. An effective measure to address this problem is to develop suitable heterojunctions. Among various photocatalyst, titanium dioxide (TiO2) appears to be an excellent photocatalyst in the degradation of organic pollutants. RESULTS Synthetization of well‐constructed heterojunction composite of niobium oxide (Nb2O5) and fibrous silica titania (FST) for enhanced photocatalytic degradation of phenol has been investigated. The photocatalytic performance demonstrated that 5 wt% Nb2O5 loaded on FST (5 Nb/FST) gave the maximum phenol degradation rate (1.70 × 10−2 mM min−1) of 10 mg L−1 phenol at pH 5 using 1000 mg L−1 catalyst within 180 min. Meanwhile, under the same conditions, 1 Nb/FST, FST, 10 Nb/FST and Nb2O5 only delivered 1.51 × 10−2, 1.30 × 10−2, 1.01 × 10−2 and 0.07 × 10−2 mM min−1, respectively. Further phenol photocatalytic degradation routes by 5 Nb/FST reveal that the main intermediates detected are hydroquinone, catechol, maleic, fumaric, and malonic acid. CONCLUSION In this work, 5 Nb2O5/FST composite, as an effective‐performance photocatalyst for phenol degradation, was well‐constructed. The advanced activity can primarily be attributed to the regulated Nb2O5 loading with FST and the effect of Nb/FST microsphere heterojunctions, synergistically. Besides, larger crystallite size, high impurity levels and Si‐O‐Nb and Nb–O–Ti bonds, offers excellent phenol degradation. © 2020 Society of Chemical Industry (SCI)

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Section: Catalyst Characterization Morphological and Structural Analysessupporting

confidence: 83%

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Zakaria

Hassan

Ibrahim

et al. 2020

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

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“…Double peaks were observed at (1630 + 1644 cm −1 ) and (1583 + 1601 cm −1 ) for chemisorbed 2,6‐dimethylpyridinium cation (DMPH + ) and 2,6‐dimethylpyridine complex, respectively. These peaks correspond to the presence of both LAS and BAS, respectively, for all catalysts. From Figure , unmodified HY‐type catalysts had more BAS than LAS.…”

Section: Resultsmentioning

confidence: 87%

“…The branching of the activated paraffin usually occurs at the acid sites, while the metallic sites provide hydrogenation‐dehydrogenation function . Conversely, hydroisomerization of n‐ alkanes can also proceed via hydrogen spillover mechanism, with the metallic sites only involved in dissociative hydrogen adsorption . A concerted effort has been made to enhance the isomer yield of C 4 ‐C 7 hydroisomerization for improving the octane number of gasoline .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, our group has reported hydroisomerization of n‐ heptane over MoO 3 /MSN and MoO 3 /KCC‐1 . MoO 3 /MSN displayed good n ‐heptane isomerization activity with 36.6% yield of mono‐branched and 6.8% yield of di‐branched isoheptanes, and the catalyst showed remarkable stability for over 100 hours.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Conversely, hydroisomerization of n-alkanes can also proceed via hydrogen spillover mechanism, with the metallic sites only involved in dissociative hydrogen adsorption. 4,5 A concerted effort has been made to enhance the isomer yield of C 4 -C 7 hydroisomerization for improving the octane number of gasoline. [6][7][8] This is basically due to increasingly stringent environmental protection regulations with regards to the use of aromatics and olefins in gasoline for octane number enhancement.…”

Section: Introductionmentioning

confidence: 99%

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Platinum‐promoted fibrous silica Y zeolite with enhanced mass transfer as a highly selective catalyst for n ‐dodecane hydroisomerization

et al. 2019

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Summary A fibrous silica zeolite Y (HY@KCC‐1) catalyst with a high surface area of 568 m2/g and unique core‐shell morphology was successfully synthesized via a modified KCC‐1 synthesis method. Characterization of the catalysts was achieved with X‐ray powder diffraction (XRD), field emission scanning microscope (FESEM), N2 adsorption/desorption, and 2,6‐dimethylpyridine adsorbed Fourier‐transform infrared spectroscopy (FTIR). The Pt/HY@KCC‐1 has displayed complete n‐dodecane conversion coupled with an incredibly enhanced isomer yield of 72% at 350°C, nearly two‐fold higher than that of unmodified Pt/HY catalyst. Remarkably, Pt/HY@KCC‐1 had an internal effectiveness factor (η) of unity and negligible internal diffusion limitation, thus suggesting its potential application in hydroisomerization of higher hydrocarbons for enhancing fuel properties.

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Surface‐modified mesoporous silica nanorods for the highly aging resistance rubber through controlled release of antioxidant

Luo

Wang

Cui

et al. 2021

Polymers for Advanced Techs

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The migration and blooming of antioxidant molecules in the field of anti‐aging rubber is a challenge, where developing novel nanocarriers loaded with antioxidant molecules can solve the above problem. In this article, the surface thiol functionalized mesoporous silica nanorods loaded with antioxidant N‐(1,3‐dimethyl)butyl‐N′‐phenyl‐p‐phenylenediamine (MSN‐SH‐4020) was synthesized to avoid the blooming of antioxidants and then to improve the anti‐aging performance of styrene‐butadiene rubber (SBR). The migration of antioxidant molecules could be limited by encapsulating antioxidant in the pore of mesoporous silica nanorods, and the contend of antioxidant in the SBR reaches up to 1.33 wt%. The sustained release of antioxidant molecules from the pore increases the effective time of action of the antioxidant. After 168 hours of thermal oxidative aging test at 100°C, styrene‐butadiene rubber with 10 wt % surface thiol functionalized mesoporous silica nanorods loaded with 4020 (MSN‐SH‐4020) shows preservation of mechanical properties without blooming. This approach is highly perspective in many applications, such as long‐life sealing rubber and conveyor belts.

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n-Heptane isomerization over mesostructured silica nanoparticles (MSN): Dissociative-adsorption of molecular hydrogen on Pt and Mo sites

Cited by 45 publications

References 49 publications

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Platinum‐promoted fibrous silica Y zeolite with enhanced mass transfer as a highly selective catalyst for n ‐dodecane hydroisomerization

Surface‐modified mesoporous silica nanorods for the highly aging resistance rubber through controlled release of antioxidant

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