Rajib Bandyopadhyay | Pandit Deendayal Petroleum University, Gandhinagar (original) (raw)
Address: Gandhinagar, Gujarat, India
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Papers by Rajib Bandyopadhyay
Springer Proceedings in Physics, 2019
MCM-22 (SiO2/Al2O3 = 30) was synthesized using colloidal silica and modified in the presence of a... more MCM-22 (SiO2/Al2O3 = 30) was synthesized using colloidal silica and modified in the presence of an organic template, surface active agent, and strong base under alkali treatment conditions. The catalyst characterization techniques confirmed its improved physical and structural properties. The results of the characterization show that modified MCM-22 plays significant role in structure, acidity, and desilication. The experimental studies revealed that hierarchical catalyst was formed by organic species—hexamethyleneimine (HMI) and quaternary ammonium hydroxide (TPAOH), which raised the pH of the solution, thereby increased the solubility of silica in the presence of sodium hydroxide and created mesoporosity. MCM-22 and modified MCM-22 show vital role in catalytic selective glycerol dehydration.
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Journal of Porous Materials, 2016
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SAPO-34 being a microporous crystalline material; its morphology is greatly influenced by synthet... more SAPO-34 being a microporous crystalline material; its morphology is greatly influenced by synthetic parameters. The aim of present investigation is to employ SAPO-34 synthesized under varying synthetic conditions to study its effect for Biginelli reaction. SAPO-34 molecular sieve was successfully synthesized in presence of four different organic templates (DEA, TEA, TEAOH and morpholine) and two different silica sources (colloidal silica and fumed silica). To achieve the SAPO-34 phase in its purest form, the template concentration was optimized by eliminating the competing phases. Synthesized catalyst samples were characterized by XRD, SEM, TG, FTIR and Total acidity analysis. The DEA and morpholine templated SAPO34 samples (colloidal silica as silica source) were found to be more acidic and hence were tested for synthesis of Biginelli condensation products such as dihyropyrimidinons. The reaction is studied further in terms of catalyst concentration and solvent effect.
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European Journal of Inorganic Chemistry, 2020
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Studies in surface science and catalysis
ABSTRACT
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ChemistrySelect
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Advanced Materials Proceedings
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Reaction Kinetics, Mechanisms and Catalysis
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Journal of Chemical Sciences
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Chemistry Letters, Aug 1, 1998
ABSTRACT
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Studies in Surface Science and Catalysis, 2002
ABSTRACT
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Catalysis Lett, 1998
ABSTRACT
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Microporous Mesoporous Mat, 2000
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International Journal of Scientific Research
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Studies in Surface Science and Catalysis, 1995
ABSTRACT
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Studies in Surface Science and Catalysis, 1998
ABSTRACT
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ABSTRACT
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Reaction Kinetics and Catalysis Letters, 1997
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Springer Proceedings in Physics, 2019
MCM-22 (SiO2/Al2O3 = 30) was synthesized using colloidal silica and modified in the presence of a... more MCM-22 (SiO2/Al2O3 = 30) was synthesized using colloidal silica and modified in the presence of an organic template, surface active agent, and strong base under alkali treatment conditions. The catalyst characterization techniques confirmed its improved physical and structural properties. The results of the characterization show that modified MCM-22 plays significant role in structure, acidity, and desilication. The experimental studies revealed that hierarchical catalyst was formed by organic species—hexamethyleneimine (HMI) and quaternary ammonium hydroxide (TPAOH), which raised the pH of the solution, thereby increased the solubility of silica in the presence of sodium hydroxide and created mesoporosity. MCM-22 and modified MCM-22 show vital role in catalytic selective glycerol dehydration.
Bookmarks Related papers MentionsView impact
Journal of Porous Materials, 2016
Bookmarks Related papers MentionsView impact
SAPO-34 being a microporous crystalline material; its morphology is greatly influenced by synthet... more SAPO-34 being a microporous crystalline material; its morphology is greatly influenced by synthetic parameters. The aim of present investigation is to employ SAPO-34 synthesized under varying synthetic conditions to study its effect for Biginelli reaction. SAPO-34 molecular sieve was successfully synthesized in presence of four different organic templates (DEA, TEA, TEAOH and morpholine) and two different silica sources (colloidal silica and fumed silica). To achieve the SAPO-34 phase in its purest form, the template concentration was optimized by eliminating the competing phases. Synthesized catalyst samples were characterized by XRD, SEM, TG, FTIR and Total acidity analysis. The DEA and morpholine templated SAPO34 samples (colloidal silica as silica source) were found to be more acidic and hence were tested for synthesis of Biginelli condensation products such as dihyropyrimidinons. The reaction is studied further in terms of catalyst concentration and solvent effect.
Bookmarks Related papers MentionsView impact
European Journal of Inorganic Chemistry, 2020
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Studies in surface science and catalysis
ABSTRACT
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ChemistrySelect
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Advanced Materials Proceedings
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Reaction Kinetics, Mechanisms and Catalysis
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Journal of Chemical Sciences
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Chemistry Letters, Aug 1, 1998
ABSTRACT
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Studies in Surface Science and Catalysis, 2002
ABSTRACT
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Catalysis Lett, 1998
ABSTRACT
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Microporous Mesoporous Mat, 2000
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International Journal of Scientific Research
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Studies in Surface Science and Catalysis, 1995
ABSTRACT
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Studies in Surface Science and Catalysis, 1998
ABSTRACT
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ABSTRACT
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Reaction Kinetics and Catalysis Letters, 1997
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