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Fast Catalytic Oxidation Of Phenol Over Modified Zeolite L Nanocrystals, Eng-Poh Ng Dr.
Fast Catalytic Oxidation Of Phenol Over Modified Zeolite L Nanocrystals, Eng-Poh Ng Dr.
Eng-Poh Ng
Iron modified zeolite L nanocrystals (Fe/KL) were synthesized hydrothermally by the incorporation of Fe3+ in zeolite L lattice. XRD results showed an increase in the inter-planar spacing and lattice parameters. Transition characteristic of the tetrahedral Fe3+ species were observed in the UV–Vis spectrum. The oxidation of phenol in the presence of acetic acid over Fe/KL gave 93.40% conversion in 30 min with selective formation of 77.47% catechol and 22.53% hydroquinone. The catalytic activity was significantly enhanced by the addition of acetic acid. It was found that the acetic acid was oxidized by hydrogen peroxide to form peracetic acid, which served …
Chapter 5 Adsorption, Eng-Poh Ng Dr.
Sulfonic Acid Functionalized Mcm-41 As Solid Acid Catalyst For Tert-Butylation Of Hydroquinone Enhanced By Microwave Heating, Eng-Poh Ng
Eng-Poh Ng
Covalently linked sulfonic acid (-SO3H) modified MCM-41 mesoporous catalysts was prepared, characterized and its catalytic activity under microwave irradiation was evaluated. The NH2-MCM-41 was first prepared by anchoring (3-aminopropyl)triethoxysilane (APTES) on Si-MCM-41 and further reacted with 1,4-butane-sultone to yield the desired acid catalyst. The mesophase and porosity of samples were determined by XRD, TEM and N2 sorption isotherm analyses. The presence of sulfonic acid moiety was confirmed by FT-IR, TG/DTA, sulfur elemental analysis and in situ IR study of pyridine and ammonia adsorptions. The catalyst showed high catalytic activity and high selectivity in tert-butylation of hydroquinone under microwave irradiation. No …
Kaa 507 Surface Analysis (Adsorption), Eng-Poh Ng Dr.
Kaa 507 Surface Analysis (Adsorption), Eng-Poh Ng Dr.
Eng-Poh Ng
No abstract provided.
Extractive Bioconversion Of Cyclodextrins By Bacillus Cereus Cyclodextrin Glycosyltransferase In Aqueous Two-Phase System, Eng-Poh Ng Dr.
Extractive Bioconversion Of Cyclodextrins By Bacillus Cereus Cyclodextrin Glycosyltransferase In Aqueous Two-Phase System, Eng-Poh Ng Dr.
Eng-Poh Ng
No abstract provided.
Ionothermal Approach For Synthesizing Alpo-5 Hexagonal Thin Plate Influenced By Various Parameters At Ambient Pressure, Eng-Poh Ng Dr.
Ionothermal Approach For Synthesizing Alpo-5 Hexagonal Thin Plate Influenced By Various Parameters At Ambient Pressure, Eng-Poh Ng Dr.
Eng-Poh Ng
No abstract provided.
The Immobilization Of Iron(Iii) Aminopyridine Complex On Mcm-41: Its Preparation And Characterization, Eng-Poh Ng Dr.
The Immobilization Of Iron(Iii) Aminopyridine Complex On Mcm-41: Its Preparation And Characterization, Eng-Poh Ng Dr.
Eng-Poh Ng
No abstract provided.