Non-covalent immobilisation of p-toluenesulfonic acid in a porous molecular crystal for size-specific acid-catalysed reactions

2016 ◽  
Vol 52 (49) ◽  
pp. 7657-7660 ◽  
Author(s):  
Shohei Tashiro ◽  
Hirotaka Yonezawa ◽  
Ryou Kubota ◽  
Tsutomu Umeki ◽  
Mitsuhiko Shionoya
Keyword(s):  
Molecular Crystal ◽  
Acid Catalyst ◽  
Toluenesulfonic Acid ◽  
Heterogeneous Acid Catalyst ◽  
Covalent Immobilisation ◽  
Acid Catalysed Reactions

A porous molecular crystal non-covalently immobilising p-toluenesulfonic acid in the nanochannels serves as a size-specific heterogeneous acid catalyst.

An efficient heterogeneous acid catalyst derived from waste ginger straw for biodiesel production

2021 ◽  
Author(s):  
Hewei Yu ◽  
Yunlong Cao ◽  
Heyao Li ◽  
Gaiju Zhao ◽  
Xingyu Zhang ◽  
...  
Keyword(s):  
Acid Catalyst ◽  
Biodiesel Production ◽  
Heterogeneous Acid Catalyst

scholarly journals Optimization of Biodiesel Production from Waste Cooking Oil Using S–TiO2/SBA-15 Heterogeneous Acid Catalyst

Catalysts ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 67 ◽  
Author(s):  
Muhammad Hossain ◽  
Md Siddik Bhuyan ◽  
Abul Md Ashraful Alam ◽  
Yong Seo
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Waste Cooking Oil ◽  
Biodiesel Production ◽  
Catalyst Loading ◽  
Esterification Reaction ◽  
Impregnation Method ◽  
Cooking Oil ◽  
Heterogeneous Acid Catalyst

The aim of this research was to synthesize, characterize, and apply a heterogeneous acid catalyst to optimum biodiesel production from hydrolyzed waste cooking oil via an esterification reaction, to meet society’s future demands. The solid acid catalyst S–TiO2/SBA-15 was synthesized by a direct wet impregnation method. The prepared catalyst was evaluated using analytical techniques, X-ray diffraction (XRD), Scanning electron microscopy (SEM) and the Brunauer–Emmett–Teller (BET) method. The statistical analysis of variance (ANOVA) was studied to validate the experimental results. The catalytic effect on biodiesel production was examined by varying the parameters as follows: temperatures of 160 to 220 °C, 20–35 min reaction time, methanol-to-oil mole ratio between 5:1 and 20:1, and catalyst loading of 0.5%–1.25%. The maximum biodiesel yield was 94.96 ± 0.12% obtained under the optimum reaction conditions of 200 °C, 30 min, and 1:15 oil to methanol molar ratio with 1.0% catalyst loading. The catalyst was reused successfully three times with 90% efficiency without regeneration. The fuel properties of the produced biodiesel were found to be within the limits set by the specifications of the biodiesel standard. This solid acid catalytic method can replace the conventional homogeneous catalyzed transesterification of waste cooking oil for biodiesel production.

Sulfonated magnetic nanobiochar as heterogeneous acid catalyst for esterification reaction

2020 ◽  
Vol 8 (4) ◽  
pp. 103912 ◽  
Author(s):  
S.N. Aisyiyah Jenie ◽  
Anis Kristiani ◽  
Sudiyarmanto ◽  
Deni S. Khaerudini ◽  
Kaoru Takeishi
Keyword(s):  
Acid Catalyst ◽  
Esterification Reaction ◽  
Heterogeneous Acid Catalyst

scholarly journals Acetylation of Eugenol over 12-Molybdophosphoric Acid Anchored in Mesoporous Silicate Support Synthesized from Flint Kaolin

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2995 ◽  
Author(s):  
Alex de Nazaré de Oliveira ◽  
Erika Tallyta Leite Lima ◽  
Deborah Terra de Oliveira ◽  
Rômulo Simões Angélica ◽  
Eloisa Helena de Aguiar Andrade ◽  
...  
Keyword(s):  
Acetic Anhydride ◽  
Acid Catalyst ◽  
Kinetic Studies ◽  
Molar Ratio ◽  
Molybdophosphoric Acid ◽  
Mesoporous Silicate ◽  
First Order Kinetics ◽  
Eugenyl Acetate ◽  
Heterogeneous Acid Catalyst ◽  
Excellent Stability

A new prepared catalyst, 12-molybdophosphoric acid (HPMo) anchored to the mesoporous aluminosilicate AlSiM, synthesized from Amazon kaolin, was characterized and used as a heterogeneous acid catalyst for the production of eugenyl acetate by acetylation of eugenol with acetic anhydride. The effect of various reaction parameters, such as catalyst concentration, eugenol/acetic anhydride molar ratio, temperature and reaction time, was studied to optimize the conditions of maximum conversion of eugenol. The kinetics studies showed that in eugenol acetylation, the substrate concentration follows a first order kinetics. The results of activation energy was 19.96 kJ mol−1 for HPMo anchored to AlSiM. The reuse of the catalyst was also studied and there was no loss of catalytic activity after four cycles of use (from 99.9% in the first cycle to 90% in the fifth cycle was confirmed), and an excellent stability of the material was observed. Based on catalytic and kinetic studies, HPMo anchored to AlSiM is considered an excellent catalyst.

A Greener Route for Synthesis of Fly Ash Supported Heterogeneous Acid Catalyst

2019 ◽  
Vol 9 ◽  
pp. 551-559
Author(s):  
Sakshi Kabra Malpani ◽  
Ashu Rani
Keyword(s):  
Fly Ash ◽  
Acid Catalyst ◽  
Heterogeneous Acid Catalyst

Esterification of rapeseed oil fatty acids using a carbon-based heterogeneous acid catalyst derived from cellulose

2016 ◽  
Vol 519 ◽  
pp. 99-106 ◽  
Author(s):  
Kristaps Malins ◽  
Janis Brinks ◽  
Valdis Kampars ◽  
Ilze Malina
Keyword(s):  
Fatty Acids ◽  
Rapeseed Oil ◽  
Acid Catalyst ◽  
Heterogeneous Acid Catalyst ◽  
Carbon Based
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