scholarly journals Condensation of Indole with Isatin over AlCl3/Mesoporous Aluminosilicate

2015 ◽  
Vol 15 (1) ◽  
pp. 56-63
Author(s):  
Tri Esti Purbaningtias ◽  
Didik Prasetyoko ◽  
Hasliza Bahruji ◽  
Yusuf Muhammad Zein ◽  
Sugeng Triwahyono ◽  
...  
Keyword(s):  
Surface Area ◽  
Lewis Acid ◽  
Acid Site ◽  
Aluminium Chloride ◽  
Total Acidity ◽  
Bronsted Acid ◽  
Site Number ◽  
Brönsted Acid ◽  
Maximum Conversion ◽  
Mesoporous Aluminosilicate

Aluminium chloride immobilized on mesoporous aluminosilicate was investigated as catalysts in the condensation of isatin with indole. AlCl3/mesoporous aluminosilicate (AlCl3/AM) catalysts were prepared by impregnation of 1, 5, 10 and 15 wt% AlCl3 on the surface of mesoporous aluminosilicate. A maximum conversion of isatin was achieved using 15% AlCl3/AM catalyst whereas the highest selectivity of 68.97% towards trisindoline was obtained using pure AM. The activity of the catalysts was depended on their acid site number and surface area. The number of Brønsted acid and the surface area affected to the conversion of isatin while the total acidity and the number of Lewis acid influenced the selectivity.

scholarly journals Sintesis Dan Karakterisasi H-Aluminosilikat Sebagai Katalis Sintesis Biogasoline Dari Asam Oleat

2019 ◽  
Vol 4 (2) ◽  
pp. 100
Author(s):  
Deasi Adhiani Farida ◽  
Abdulloh Abdulloh ◽  
Ahmadi Jaya Permana
Keyword(s):  
Oleic Acid ◽  
Hydrothermal Method ◽  
Lewis Acid ◽  
Acid Site ◽  
Lewis Acid Site ◽  
Bronsted Acid ◽  
Bronsted Acid Site ◽  
Brønsted Acid Site ◽  
Brönsted Acid ◽  
Cracking Reaction

ABSTRACT          Aluminosilicate can be used for cracking reaction. In this study, catalyst of H-aluminosilicate has been synthesized by hydrothermal method with ratio molar Si/Al is 20. The characterizations has been performed by XRD, FTIR and acidity test. Characterization by XRD showed that catalyst of H-aluminosilicate have structure amorphous, while FTIR showed Si-O-Al bond at 457 cm-1. The acidity test showed that catalyst of H-aluminosilicate have Brønsted acid site 0.0272 mmol/g and Lewis acid site 0.0005 mmol/g. Oleic acid was cracking at 340 oC for 3 and 5 hours. The product has been analyzed by GC-MS not showed compound forming biogasoline.Keywords: H-aluminosilicate, biogasoline, oleic acid ABSTRAK          Aluminosilikat dapat digunakan sebagai katalis dalam reaksi prengkahan. Pada penelitian ini telah dilakukan sintesis katalis H-aluminosilikat melalui metode hidrotermal dengan rasio Si/Al sebesar 20. Karakterisasi yang telah dilakukan meliputi uji XRD, FTIR, dan keasaman.Hasil XRD menunjukkan katalis H-aluminosilikat berbentuk amorf, sedangkan pada FTIR menunjukkan ikatan Si-O-Al pada bilangan gelombang 457 cm-1. Uji situs asam menunjukkan katalis H-aluminosilikat memiliki jumlah asam Brønsted sebesar 0.0272 mmol/g dan jumlah sisi asam Lewis sebesar 0.0005 mmol/g. Proses perengkahan asam oleat telah dilakukan pada suhu 340oC selama 3 jam dan 5 jam. Produk cracking yang diuji dengan GC-MS tidak menunjukkan pembentukan senyawa biogasoline.Kata kunci: H-aluminosilikat, biogasoline, asam oleat

Brønsted acid site number evaluation using isopropylamine decomposition on Y-zeolite contaminated with vanadium in a simultaneous DSC–TGA analyzer

2008 ◽  
Vol 470 (1-2) ◽  
pp. 36-39 ◽  
Author(s):  
Yonnathan Osorio Pérez ◽  
Liliam Alexandra Palomeque Forero ◽  
Diana Vanessa Cristiano Torres ◽  
Carlos Alexander Trujillo
Keyword(s):  
Acid Site ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Y Zeolite ◽  
Bronsted Acid Site ◽  
Site Number ◽  
Brønsted Acid Site ◽  
Brönsted Acid

scholarly journals Tailoring Lewis/Brønsted acid properties of MOF nodes via hydrothermal and solvothermal synthesis: simple approach with exceptional catalytic implications

2021 ◽  
Author(s):  
Sergio Rojas-Buzo ◽  
Benjamin Bohigues ◽  
Christian W. Lopes ◽  
Débora M. Meira ◽  
Mercedes Boronat ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Active Site ◽  
Solvothermal Synthesis ◽  
Simple Approach ◽  
Organic Reactions ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Acid Properties ◽  
Brönsted Acid

The Brønsted/Lewis acid properties of Hf-MOF-808 can be tuned by simply controlling the solvent employed in its synthesis, with direct catalytic implications on the activity and selectivity of organic reactions sensitive to the active site nature.

Effects of Brønsted acid site proximity in chabazite zeolites on OH infrared spectra and protolytic propane cracking kinetics

2021 ◽  
Vol 395 ◽  
pp. 210-226
Author(s):  
Philip M. Kester ◽  
Jerry T. Crum ◽  
Sichi Li ◽  
William F. Schneider ◽  
Rajamani Gounder
Keyword(s):  
Infrared Spectra ◽  
Acid Site ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Bronsted Acid Site ◽  
Brønsted Acid Site ◽  
Brönsted Acid ◽  
Propane Cracking

Study on the removal and depolymerization of lignin from corn stover through the synergistic effect of Brønsted acid, Lewis acid and hydrogenation sites

Fuel ◽  
2021 ◽  
Vol 305 ◽  
pp. 121509
Author(s):  
Baikai Zhang ◽  
Wenzhi Li ◽  
Tingwei Zhang ◽  
Xu Li ◽  
Ajibola T. Ogunbiyi ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Corn Stover ◽  
Lewis Acid ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brönsted Acid

Critical role of Bronsted acid in Lewis-acid-catalyzed synthesis of Amadori and Heyns compounds of β-amino acids

2021 ◽  
pp. 1-11
Author(s):  
Debasree Chanda ◽  
Gangothri M. Venkataswamy ◽  
Lagamawwa V. Hipparagi ◽  
Nanishankar V. Harohally
Keyword(s):  
Amino Acids ◽  
Lewis Acid ◽  
Critical Role ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brönsted Acid ◽  
Acid Catalyzed

Formation of Brønsted acid site on halide clusters of group 5 and 6 transition metals

2005 ◽  
Vol 226 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Satoshi Kamiguchi ◽  
Satoru Nishida ◽  
Hideki Kurokawa ◽  
Hiroshi Miura ◽  
Teiji Chihara
Keyword(s):  
Transition Metals ◽  
Acid Site ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Bronsted Acid Site ◽  
Brønsted Acid Site ◽  
Brönsted Acid ◽  
Group 5
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