Jih-mirn Jehng

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Jayjit Majumdar

University of Kalyani

Dr. Goutam Thakur

Manipal Academy of Higher Education

Sambit Sahoo

Cleveland Clinic

Akhilesh Gaharwar

Texas A&M University

Anis Nurashikin Nordin

International Islamic University Malaysia

Sudheesh K Shukla, PhD

LOVELY PROFESSIONAL UNIVERSITY

shivani R pandya

Parul university

Elsie Effah Kaufmann

University of Ghana

Carlos Luna Criado

Universidad Autónoma de Nuevo León

Franz Giessibl

University of Regensburg

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Papers by Jih-mirn Jehng

Catalytic Properties of Ethylene Reactions Using Silver and Reduced Vanadium Oxide Catalysts on MEMS Chips with Micro Hot Plate

Sensors and materials, Jan 31, 2024

PETR 57-Oxidation catalysis over the nanosupported metal oxide catalysts

Preparation and characterization of hydrotalcite-like compounds containing transition metal as a solid base catalyst for the transesterification

Applied Catalysis A-general, Oct 1, 2012

Abstract Hydrotalcite-like compounds (HTLCs) containing Mg 2+ , Fe 3+ and Al 3+ layered double hy... more Abstract Hydrotalcite-like compounds (HTLCs) containing Mg 2+ , Fe 3+ and Al 3+ layered double hydroxide (LDH) were synthesized by co-precipitation method and calcined at 873 K for 16 h. These heterogeneous base catalysts were used for the transesterification of soybean oil with methanol to produce biodiesel. The Mg/Fe molar ratio was varied from 6 to 15, but the MgAlFe catalysts have a constant Al composition in the hydrotalcite-like structures. The catalysts were characterized by nitrogen physisorption, X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), CO 2 temperature programmed desorption (CO 2 -TPD), field-emission scanning electron microscope (FE-SEM), and Fourier transfer infrared spectroscopy (FTIR). The conversion of fatty acid methyl ester (FAME) has been affected by the basicity and Mg content in the MgAlFe catalysts. When MgAlFe 15 was used, the highest basicity and high conversion of FAME (81%) was obtained due to the formation of Mg 2+ –O 2− , Al 3+ –O 2− pairs, and the higher CO 2 -desorption temperature.

Alumina-Supported Manganese Oxide Catalysts

Journal of Catalysis, Nov 1, 1994

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Recent Catalytic Applications of Niobium-Based Materials

High Temperature Materials and Processes, 1993

The literature review of niobium oxide catalysts reveals that niobium-based materials are effecti... more The literature review of niobium oxide catalysts reveals that niobium-based materials are effective catalysts for many catalytic reactions: pollution abatement, selective oxidation, hydrocarbon conversion, dehydrogenation, carbon monoxide hydrogenation for synthetic fuels and chemicals, hydration/dehydration, and photochemistry. The niobium oxide catalytic materials are present as bulk layered niobium oxides, surface niobium oxide phases, hydrated niobium oxide, oxide support, or mixed oxide. Recent research activities are focusing on the development of new niobium-based catalysts such as surface niobium oxide phases and layered niobium oxide compounds. Recent Catalytic Applications of Niobium-Based Materials Recent Catalytic Applications of Niobium-Based Materials Recent Catalytic Applications of Niobium-Based Materials Recent Catalytic Applications of Niobium-Based Materials Recent Catalytic Applications of Niobium-Based Materials

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The ZnO–Au-Titanium oxide nanotubes (TiNTs) composites photocatalysts for CO2 reduction application

Ceramics International, Nov 1, 2021

ChemInform Abstract: Surface Modified Niobium Oxide Catalyst: Synthesis, Characterization, and Catalysis

ChemInform, Aug 21, 2010

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

A High-Performance Nanocomposite Material Based on Functionalized Carbon Nanotube and Polymer for Gas Sensing Applications

AIP Conference Proceedings, 2009

The aim of this study is to develop a novel chemical gas sensing nanocomposite material. The trad... more The aim of this study is to develop a novel chemical gas sensing nanocomposite material. The traditional use for carbon nanotube in gas sensing polymer is to increase the composite's conductivity. However, we added functionalized carbon nanotube to fill the free volume of the sensing polymer films and enhance the gas absorption/desorption response time of these nanocomposites. These sensing materials were prepared by mixing functionalized multiwalled carbon nanotubes (MWNTs) and Poly (n, n dimethylamino propylsilsequioxane) SXNR polymer. These new materials were coated on the Surface Acoustic Wave (SAW) device, which is expected to increase its sensitivity in analyzing specific classes of vapors. The proposed materials showed an enhanced sensitivity upon exposure to ethanol and dimethyl methylphosphonate (Dmmp) vapors. Additionally, the performances of our nanocomposite film are much higher than those polymers without functionalized carbon nanotubes.

Plasmon Ag/AgVO3/ TiO2-nanowires S-scheme heterojunction photocatalyst for CO2 reduction

Journal of environmental chemical engineering, Jun 1, 2022

Synthesis and characterization of carbon nanotubes synthesized over NiO/Na-montmorillonite catalyst and application to a hydrogen peroxide sensor

Materials Chemistry and Physics, 2009

In this study, we demonstrate the synthesis of carbon nanotubes (CNTs) on clay mineral layers, an... more In this study, we demonstrate the synthesis of carbon nanotubes (CNTs) on clay mineral layers, and the preparation of hydrogen peroxide (H2O2) sensor based on CNT/Nafion/Na-montmorillonite (Clay) composite film for the detection of H2O2. The nickel oxide metallic catalyst (NiO) has been prepared by the polyol method and then dispersed onto the clay mineral layers. The CNTs were successfully synthesized over the NiO/Clay catalyst onto clay layers to form a three-dimensional CNT/Clay network by thermal chemical vapor deposition method. From field-emission scanning electron microscope images, the results of X-ray diffraction and Fourier transfer infrared spectra; the layered clay platelets are apparently delaminated and exfoliated after the growth of CNTs onto the surface of clay minerals. The mixed hybrid film of Nafion and CNT/Clay is coated on the glassy carbon electrode to detect hydrogen peroxide (H2O2). This composite film performs a detection limit of 1.0×10−4M for H2O2 and the current is linear for H2O2 concentrations from 0.1 to 12.8mM. Furthermore, the sensitivity of the GCE modified with the CNT/Clay/Nafion hybrid film to H2O2 was calculated to be 1.71×105μAM−1cm−2. Consequently, the CNT/Clay/Nafion medium can probably be a useful electrode for the development of sensors due to its high sensitivity and applicability.

Synthesis and characterization of carbon nanotubes on clay minerals and its application to a hydrogen peroxide biosensor

Materials Science and Engineering: C, 2009

In this study, we demonstrate the synthesis of carbon nanotubes (CNTs) on clay minerals, and the ... more In this study, we demonstrate the synthesis of carbon nanotubes (CNTs) on clay minerals, and the development of biosensors based on Nafion–CNT/Clay–Au and Nafion–CNT/Clay–Au–Glucose oxidase (GOD) composite films for the detection of hydrogen peroxide (H2O2) and glucose, respectively. The CNTs are synthesized on nickel cation exchanged clay mineral platelets. From field-emission scanning electron microscope images, X-ray diffraction, Fourier transfer infrared

Molecular structures of supported niobium oxide catalysts under in situ conditions

The Journal of Physical Chemistry, Sep 1, 1991

Supported niobium oxide catalysts were investigated by in situ Raman spectroscopy as a function o... more Supported niobium oxide catalysts were investigated by in situ Raman spectroscopy as a function of NbzO5 loading and oxide support (MgO, A1203, TiO,, ZrO,, and S i 0 3 in order to determine the molecular structures of the dehydrated surface niobium oxide species. On the S O 2 support, only one dehydrated surface niobium oxide species corresponding to the highly distorted Nb06 octahedral structure at-980 cm-' is present. The highly distorted Nb06 octahedra responsible for Raman bands at-985 and-935 cm-' are also observed on the TiO, and ZrOz supports at high surface coverages; however, the dehydrated surface niobium oxide phases possessing Raman bands in the 600-700-cm-' region cannot be directly observed for Nb205/Ti02 and Nb20S/Zr02 because of the strong vibrations of the oxide supports in this region. Below half a monolayer coverage on the A1203 support, two kinds of dehydrated surface niobium oxide species possessing highly and moderately distorted Nb06 octahedra with Nb=O Raman bands at-980 and-883 cm-I, respectively, are present. Upon approaching monolayer coverage on the A1203 support, additional Raman bands at-935 and-647 cm-' characteristic of highly and slightly distorted Nb06 octahedra are present and are suggestive of a layered niobium oxide structure. Multiple niobium oxide species are present in the Nb,Os/MgO system and are due to the strong acid-base interactions between Nb2OS and Mg2+ as well as Ca2+ impurity cations present on the surface. The various dehydrated surface niobium oxide species present in the supported niobium oxide catalysts appear to be related to the oxide support surface hydroxyl chemistry.

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Temperature-Programmed (TP) Techniques

Springer eBooks, 2023

Determination of the nature of active surface sites present on bulk mixed Mo-V-Te-Nb-O metal oxide catalysts

THE INTERACTION OF V2Os AND Nb2Os WITH OXIDE SURFACES

The interaction of vanadium oxide and niobium oxide with A1203 and TiO2 supports is examined with... more The interaction of vanadium oxide and niobium oxide with A1203 and TiO2 supports is examined with Raman spectroscopy. The Raman spectra of the supported metal oxides reveal that the strong interaction of the metal oxides with AI203 and TiO2 supports results in the formation of two-dimensional surface metal oxide overlayers. The surface vanadium oxide overlayers are unstable to high calcination temperatures and readily undergo solid state transformations. The surface niobium oxide overlayers are much more stable to high-temperature calcination treatments and retard solid state transformations of the mixed oxide systems.

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Molecular engineering of V205-supported on mixed oxide supports during methanol oxidation

Synthesis, characterization and electrochemical properties of Fe/MnO2 nanoparticles prepared by using sol–gel reaction

Journal of The Taiwan Institute of Chemical Engineers, Mar 1, 2014

ABSTRACT The δ-MnO2 has been prepared by using sol–gel reaction of fumaric acid and KMnO4 in a mi... more ABSTRACT The δ-MnO2 has been prepared by using sol–gel reaction of fumaric acid and KMnO4 in a mixed alcohol/aqueous solution, and modified with HCl and ferrous ion (Fe2+) to form different MnO2-based materials possessing different electrochemical properties. These MnO2-based materials have been characterized by BET, XRD, ICP, FESEM, and TEM. The electrochemical performance was measured by CV and charge/discharge tests in 1 M Na2SO4 aqueous solution. From the charge/discharge test, the calculated specific capacitance of the Fe/MnO2 sample was 210 F/g at a specific current of 0.4 A/g. It indicates that Fe-modified δ-MnO2 has well electrochemical properties for supercapacitor applications.

Resolving the Oxygen Species on Ozone Activated AgAu Alloy Catalysts for Oxidative Methanol Coupling

The Journal of Physical Chemistry C

The Activity and Selectivity Properties of Supported Metal Oxide Catalysts During Oxidation Reactions

ACS Symposium Series, 1996

Structure-reactivity studies involving model supported metal oxide catalysts reveal that the effi... more Structure-reactivity studies involving model supported metal oxide catalysts reveal that the efficiency of a particular selective oxidation reaction depends on the specific supported metal oxide species, the coverage of the surface metal oxide species, the oxide support, and the presence of secondary metal oxide additives. In situ Raman spectroscopy, activity, and selectivity of the partial oxidation of methanol, alkanes, and the selective catalytic reduction of NO with ammonia are discussed with respect to the above factors for supported metal oxide catalysts. Supported metal oxide catalysts are extensively employed in the petrochemical and pollution control industries as oxidation catalysts. For example, titania supported vanadia catalysts are used for the selective oxidation of o-xylene to phthalic anhydride, ammoxidation of aromatic methyl groups and the selective catalytic reduction (SCR) of NO x with ammonia. The active redox components (V, Mo, Cr or Re) of supported metal oxide catalysts are present as two-dimensional metal oxide overlayers on the high surface area oxide supports (e.g., titania, alumina, silica, niobia, zirconia, etc.). Such supported metal oxide catalysts are also ideal model systems to study the fundamental aspects of selective oxidation reactions because the active surface redox sites can be molecularly characterized with in situ Raman, IR, solid state NMR, DRS and EXAFS/XANES. Furthermore, the environment around the active redox sites can also be varied by changing the surface metal oxide coverage, changing the specific oxide support or by the addition of secondary metal oxide additives (e.g., oxides of W, Nb, P, etc.) to the two-dimensional overlayer. In the present investigation, Raman

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Application of Graphene Oxide Aerogel to the Adsorption of Polycyclic Aromatic Hydrocarbons Emitted from the Diesel Vehicular Exhaust

Journal of Environmental Chemical Engineering, 2019

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Catalytic Properties of Ethylene Reactions Using Silver and Reduced Vanadium Oxide Catalysts on MEMS Chips with Micro Hot Plate

Sensors and materials, Jan 31, 2024

PETR 57-Oxidation catalysis over the nanosupported metal oxide catalysts

Preparation and characterization of hydrotalcite-like compounds containing transition metal as a solid base catalyst for the transesterification

Applied Catalysis A-general, Oct 1, 2012

Alumina-Supported Manganese Oxide Catalysts

Journal of Catalysis, Nov 1, 1994

Download

Recent Catalytic Applications of Niobium-Based Materials

High Temperature Materials and Processes, 1993

Download

The ZnO–Au-Titanium oxide nanotubes (TiNTs) composites photocatalysts for CO2 reduction application

Ceramics International, Nov 1, 2021

ChemInform Abstract: Surface Modified Niobium Oxide Catalyst: Synthesis, Characterization, and Catalysis

ChemInform, Aug 21, 2010

A High-Performance Nanocomposite Material Based on Functionalized Carbon Nanotube and Polymer for Gas Sensing Applications

AIP Conference Proceedings, 2009

Plasmon Ag/AgVO3/ TiO2-nanowires S-scheme heterojunction photocatalyst for CO2 reduction

Journal of environmental chemical engineering, Jun 1, 2022

Synthesis and characterization of carbon nanotubes synthesized over NiO/Na-montmorillonite catalyst and application to a hydrogen peroxide sensor

Materials Chemistry and Physics, 2009

Synthesis and characterization of carbon nanotubes on clay minerals and its application to a hydrogen peroxide biosensor

Materials Science and Engineering: C, 2009

Molecular structures of supported niobium oxide catalysts under in situ conditions

The Journal of Physical Chemistry, Sep 1, 1991

Download

Temperature-Programmed (TP) Techniques

Springer eBooks, 2023

Determination of the nature of active surface sites present on bulk mixed Mo-V-Te-Nb-O metal oxide catalysts

THE INTERACTION OF V2Os AND Nb2Os WITH OXIDE SURFACES

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Molecular engineering of V205-supported on mixed oxide supports during methanol oxidation

Synthesis, characterization and electrochemical properties of Fe/MnO2 nanoparticles prepared by using sol–gel reaction

Journal of The Taiwan Institute of Chemical Engineers, Mar 1, 2014

Resolving the Oxygen Species on Ozone Activated AgAu Alloy Catalysts for Oxidative Methanol Coupling

The Journal of Physical Chemistry C

The Activity and Selectivity Properties of Supported Metal Oxide Catalysts During Oxidation Reactions

ACS Symposium Series, 1996

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Application of Graphene Oxide Aerogel to the Adsorption of Polycyclic Aromatic Hydrocarbons Emitted from the Diesel Vehicular Exhaust

Journal of Environmental Chemical Engineering, 2019

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