2017
DOI: 10.1021/acsanm.7b00169
|View full text |Cite
|
Sign up to set email alerts
|

Nanostructured Zeolites: The Introduction of Intracrystalline Mesoporosity in Basic Faujasite-type Catalysts

Abstract: A combination of post-synthesis modifications and ion-exchange aiming to obtain basic cation-rich hierarchical zeolites X and Y was utilised in this work for the preparation of catalysts for biofuel production from vegetable oils. The secondary mesopore system with a narrow pore size distribution in the 4 nm range was introduced by successive acid and base treatments accompanied with surfactant templating. This was followed by ion-exchange with Cs + and K + cations to produce strong basic catalysts. The prepar… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

2
27
0

Year Published

2019
2019
2022
2022

Publication Types

Select...
5
2
1

Relationship

1
7

Authors

Journals

citations
Cited by 46 publications
(29 citation statements)
references
References 57 publications
2
27
0
Order By: Relevance
“…Furthermore, arrays of parallel mesopores are observed for the latter two zeolites, which would correspond to the long-range order peaks detected in the XRD patterns at $2 (d-spacing of $4 nm). In agreement with previous reports, 21,24,32 the generated mesopores are clearly located in the MOR zeolite crystals, conrming that a single step rearrangement process takes place during the mesostructuring of a large-pore zeolite in the presence of the cationic surfactant under mildly basic treatment conditions in contrast to the recrystallisation procedure, involving partial destruction and reassembly under more severe conditions. Interestingly, in the case of LTL zeolite (Fig.…”
Section: Resultssupporting
confidence: 92%
See 1 more Smart Citation
“…Furthermore, arrays of parallel mesopores are observed for the latter two zeolites, which would correspond to the long-range order peaks detected in the XRD patterns at $2 (d-spacing of $4 nm). In agreement with previous reports, 21,24,32 the generated mesopores are clearly located in the MOR zeolite crystals, conrming that a single step rearrangement process takes place during the mesostructuring of a large-pore zeolite in the presence of the cationic surfactant under mildly basic treatment conditions in contrast to the recrystallisation procedure, involving partial destruction and reassembly under more severe conditions. Interestingly, in the case of LTL zeolite (Fig.…”
Section: Resultssupporting
confidence: 92%
“…Na-Y zeolite (FAU structure type, CBV100, Si/Al ¼ 2.6) was purchased from Zeolyst International and modied to obtain the hierarchical zeolite, following the procedure adapted from ref. 24. In a typical preparation, 5.0 g of the commercial faujasite was mixed with 50 mL of water and the pH of the slurry was adjusted to $5.5-5.7 using few drops of dilute nitric acid (Fisher Scientic, 70%).…”
Section: Synthesis Of Hierarchical Zeolitesmentioning
confidence: 99%
“…The developed protocol facilitated by ultrasonication is generic, which was proved by using citric acid (CA) as the chelator in the chemical dealumination step. Citric acid has been used commonly in the post-synthesis dealumination of various zeolites such as ZSM-5 [36][37][38], zeolite beta [39][40][41] and zeolite Y [3,11,16,42,43] with few studies using CA in the sequential treatment [11,21,42]. For example, Xing et al [42] performed the sequential hydrothermal treatment of zeolite Y using 0.17 mol$L -1 citric acid for dealumination (4 h) and 0.1 mol$L -1 NaOH for desilication (6 h), and introduced a large amount of mesopores in the resulting zeolite (V meso = 0.29 cm 3 $g -1 ).…”
Section: Resultsmentioning
confidence: 99%
“…Hierarchical zeolites of faujasite type were also used as basic catalysts [26]. Zeolites X and Y were first treated with citric acid which created defects in the framework that facilitated braking Si-O-Al bonds during CTAB treatment in alkali solution [29].…”
Section: Post-synthetic Surfactant Templating Of Zeolite Ymentioning
confidence: 99%
“…Mesoporous aluminosilicates can be produced as well by micelles-templating of zeolite seeds [24]. Zeolite crystals can be modified with organic surfactants without deterioration of their structure with the method called "mesostructuring" [23,[25][26][27][28][29]. Another strategy called "top down" is postsynthesis treatment in which demetalation was found to be the most practical method for obtaining hierarchical zeolites.…”
Section: Introductionmentioning
confidence: 99%