Mesoporous silico-aluminophosphates derived from microporous precursors as promising catalyst for hydroisomerization

Yadav, Rekha; Singh, Arvind; Sakthivel, Ayyamperumal

doi:10.1016/j.cattod.2014.09.026

Cited by 19 publications

(12 citation statements)

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“…Figure S2 shows the powder X-ray diffraction patterns of as-prepared diaminosilane functionalized SAPO-37. The diffraction patterns of all the samples (SAPO-37-DAS-0.04 to SAPO-37-DAS-0.32) exhibited characteristic reflections corresponding to the SAPO-37 framework 33 34 35 . The XRD patterns remained intact with a highly crystalline phase even in the presence of large amount of diaminosilane functionality introduced, suggesting that the faujasite-type SAPO-37 framework structure was preserved during synthesis.…”

Section: Resultsmentioning

confidence: 99%

“…This study clearly shows that sodium nitrate extraction method efficiently removes the template from diaminosilane functionalized SAPO-37. The extraction method have been extended to MESO-SAPO-37 (as shown in Figure S6 ) prepared as per the procedure described earlier 34 35 , and other microporous systems viz. SAPO-40, SAPO-5 (as shown in Figure S6 ).…”

Section: Resultsmentioning

confidence: 99%

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In-situ preparation of functionalized molecular sieve material and a methodology to remove template

Yadav

Ahmed

Singh

et al. 2016

Sci Rep

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A series of diaminosilane-functionalized silicoaluminophosphate molecular sieve (SAPO-37) was prepared by in-situ synthesis, and a novel method was developed for the selective removal of structure directing agent (SDA)/template from the functionalized SAPO-37.The complete removal of the SDA was evident according to FT-IR, TGA, 13 C MAS-NMR and elemental analysis. The developed method was found to be efficient for removal of template from microporous molecular sieve viz., SAPO-37 and can be applied for other microporous molecular sieves such as SAPO-5, SAPO-40, etc. The powder XRD pattern of the template-removed samples showed a highly crystalline SAPO-37 phase. Argentometric titration revealed that more than 90% of diamine functionality exposed on the surface was accessible for catalytic applications. The resultant materials showed promising activity for ring opening of epoxide with aniline to yield β-amino-alcohol.The synthesis of zeolite and zeolite like microporous molecular sieves with organic functional groups within the channels and framework can tailor their textural as well as catalytic properties depending on the nature of the functional groups incorporated [1][2][3][4][5][6][7][8][9][10][11] . In general, organic functional groups have been introduced on the surface of molecular sieve materials either through in-situ co-condensation using organosilane precursors or by post-synthetic functionalization. The in-situ introduction of organic functional group in inorganic framework, results in organic-inorganic hybrid materials possessing unique properties such as hydrophobic environment, adsorption capacity etc. The hybrid materials are synthesized in hydrothermal conditions and have organic group either as pendent hung within pore or partially substituted either inside the framework or on external surface [12][13][14][15] . The post-synthetic grafting method has been studied extensively for mesoporous materials which are applied in various applications, such as CO 2 capture [16][17][18] and base-catalyzed reactions [19][20][21][22][23][24] . Though mesoporous molecular sieves based materials shown promising applications, their commercial applications are limited owing to poor stability and amorphous wall properties 25 . Although, post-synthetic method covalently anchors functional groups on the surface of molecular sieve materials increasing in surface functionality, it is difficult to control the distribution of functional groups which results in non-homogeneous allocation of functional groups on surface and within the channels 26 . Faujasite (FAU) type microporous molecular sieve possessing 3-D pore structure with pore opening of 12-membered ring and large sodalite cages are commercially important in crude oil industries (about 40% conversions) 27 . Further introduction of organic functionality in microporous molecular sieves will result in new class of shape selective catalysts with organic active group. Three-dimensional framework materials with organic groups were first reported by Maeda et al.1 by in...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

In-situ preparation of functionalized molecular sieve material and a methodology to remove template

Yadav

Ahmed

Singh

et al. 2016

Sci Rep

Self Cite

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show abstract

“…Reproduced from Ref. [68]. tetraethylorthosilicate helps to improve the Brönsted acidity by the introduction of silicate species in the framework, and improving the uniformity of the mesoporous channels helps to enhance the 1-octene conversion level by approximately 95% while the desired branched isomer selectivity of 58% was achieved.…”

Section: Meso/microcomposite Of Aluminophosphate-based Materials As Pmentioning

confidence: 97%

“…Subsequently, series of Meso-SAPO (Meso-SAPO-37, Meso-SAPO-34 and Meso-SAPO-5) have been prepared from different microporous precursors (SAPO-37, SAPO-34 and SAPO-37) and utilized for the petrochemically important hydroisomerization of 1-octene, and the results are reproduced here [68]. The schematic representation of the assembly of Meso-SAPO-n and its application for hydroisomerization of olefin is represented in Scheme 2 [68].…”

Section: Meso/microcomposite Of Aluminophosphate-based Materials As Pmentioning

confidence: 98%

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Role of Meso/Microporous Molecular Sieve Composite Materials on Various Catalytic Transformations

Sakthivel

Singh

2015

Sustainable Catalytic Processes

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Synthesis and Catalytic Application of Mesoporous Titanium Silicoaluminophosphate-37 (MESO-TSAPO-37) Molecular Sieves Assembled from Microporous TSAPO-37 Precursor

2016

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Mesoporous silico-aluminophosphates derived from microporous precursors as promising catalyst for hydroisomerization

Cited by 19 publications

References 50 publications

In-situ preparation of functionalized molecular sieve material and a methodology to remove template

In-situ preparation of functionalized molecular sieve material and a methodology to remove template

Role of Meso/Microporous Molecular Sieve Composite Materials on Various Catalytic Transformations

Synthesis and Catalytic Application of Mesoporous Titanium Silicoaluminophosphate-37 (MESO-TSAPO-37) Molecular Sieves Assembled from Microporous TSAPO-37 Precursor

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