scholarly journals High-silica nanocrystalline Beta zeolites: efficient synthesis and catalytic application

2016 ◽  
Vol 7 (1) ◽  
pp. 102-108 ◽  
Author(s):  
Raquel Martínez-Franco ◽  
Cecilia Paris ◽  
Marta E. Martínez-Armero ◽  
Cristina Martínez ◽  
Manuel Moliner ◽  
...  
Keyword(s):  
Efficient Synthesis ◽  
High Solid ◽  
Catalytic Application ◽  
Beta Zeolites ◽  
High Silica ◽  
Synthesis Methodology ◽  
20 Nm

An efficient synthesis methodology to obtain homogeneous nanosized high-silica Beta zeolites (∼10–20 nm) with high solid yields (above 95%) using simple alkyl-substituted flexible dicationic OSDAs is described.

scholarly journals High yield synthesis of high-silica chabazite by combining the role of zeolite precursors and tetraethylammonium: SCR of NOx

2015 ◽  
Vol 51 (49) ◽  
pp. 9965-9968 ◽  
Author(s):  
Nuria Martín ◽  
Manuel Moliner ◽  
Avelino Corma
Keyword(s):  
High Yield ◽  
High Solid ◽  
Rational Combination ◽  
High Silica ◽  
Scr Of Nox ◽  
Zeolite Precursors

The synthesis of chabazite with high solid yields is achieved by the rational combination of directing effects of a source of Si and Al coming from USY zeolites and the inexpensive tetraethylammonium.

Synthesis of high-Si hierarchical beta zeolites without mesoporogen and their catalytic application in the methanol to propene reaction

2018 ◽  
Vol 8 (11) ◽  
pp. 2966-2974 ◽  
Author(s):  
Xuebin Zhao ◽  
Linying Wang ◽  
Peng Guo ◽  
Nana Yan ◽  
Tantan Sun ◽  
...  
Keyword(s):  
Single Crystalline ◽  
Catalytic Application ◽  
Beta Zeolites ◽  
First Time ◽  
Hierarchical Beta

High-Si single-crystalline beta zeolites with intracrystal mesopores were synthesized for the first time and investigated as catalysts for the methanol to propene (MTP) reaction.

scholarly journals Synthesis, effect of substituents on the regiochemistry and equilibrium studies of tetrazolo[1,5-a]pyrimidine/2-azidopyrimidines

2017 ◽  
Vol 13 ◽  
pp. 2396-2407 ◽  
Author(s):  
Elisandra Scapin ◽  
Paulo R S Salbego ◽  
Caroline R Bender ◽  
Alexandre R Meyer ◽  
Anderson B Pagliari ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Heterocyclic Ring ◽  
Efficient Synthesis ◽  
Mo Calculations ◽  
Equilibrium Studies ◽  
Functional Theory ◽  
Cyclocondensation Reaction ◽  
The Stability ◽  
Synthesis Methodology

An efficient synthesis methodology for a series of tetrazolo[1,5-a]pyrimidines substituted at the 5- and 7-positions from the cyclocondensation reaction [CCC + NCN] was developed. The NCN corresponds to 5-aminotetrazole and CCC to β-enaminone. Two distinct products were observed in accordance with the β-enaminone substituent. When observed in solution, the compounds can be divided into two groups: (a) precursor compounds with R = CF3 or CCl3, which leads to tetrazolo[1,5-a]pyrimidines in high regioselectivity with R at the 7-position of the heterocyclic ring; and (b) precursor compounds with R = aryl or methyl, which leads to a mixture of compounds, tetrazolo[1,5-a] pyrimidines (R in the 5-position of the ring) and 2-azidopyrimidines (R in the 4-position of the ring), which was attributed to an equilibrium of azide–tetrazole. In the solid state, all compounds were found as 2-azidopyrimidines. The regiochemistry of the reaction and the stability of the products are discussed on the basis of the data obtained by density functional theory (DFT) for energetic and molecular orbital (MO) calculations.

A simple method for efficient synthesis of tetrapyridyl-porphyrin using Adler method in acidic ionic liquids

RSC Advances ◽  
2014 ◽  
Vol 4 (51) ◽  
pp. 26777-26782 ◽  
Author(s):  
Satoshi Kitaoka ◽  
Kaoru Nobuoka ◽  
Keita Ihara ◽  
Yuichi Ishikawa
Keyword(s):  
Ionic Liquids ◽  
Efficient Synthesis ◽  
Simple Method ◽  
Acidic Ionic Liquids ◽  
Synthesis Methodology

The TPyP synthesis methodology using acidic ionic liquids can remove the ionic liquids from TPyP by easy filtration in contrast to the traditional Adler method.

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