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Zn-modified mesoporous Al<sub>2</sub>O<sub>3</sub> for CO<sub>2</sub> hydrogenation to methanol
( Mansoor Ali ),배종욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
For the reduction of atmospheric CO<sub>2</sub> emission, considerable achievements have been made in CO<sub>2</sub> hydrogenation to various chemicals such as alcohols, lower olefins and fuels. However, the synthesis of aromatics from one-pass CO<sub>2</sub> hydrogenation is still a great challenge owing to the extreme inertness of CO<sub>2</sub> and higher C-C coupling barrier. Therefore, the mesoporous Zn/Al<sub>2</sub>O<sub>3</sub> by varying Zn content was investigated for the CO<sub>2</sub> hydrogenation to methanol and dimethyl ether (DME). At a relatively higher temperature, ZnO and ZnAl<sub>2</sub>O<sub>4</sub> were active for CO<sub>2</sub> hydrogenation and Lewis acidic Al<sub>2</sub>O<sub>3</sub> sites were active for methanol dehydration to DME. Furthermore, Zn/Al<sub>2</sub>O<sub>3</sub> in combination with HZSM-5 was prepared to directly synthesize aromatics from oxygenates formed by CO<sub>2</sub> hydrogenation.
Mansoor Anbia,Seyyed Ershad Moradi 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.6
Chemically modified mesoporous carbon (CMMC) and chemically modified activated carbon (CMAC)were prepared by an acid surface modification method from mesoporous carbon (MC) and commercial activated carbon (AC) by wet impregnation method. The structural order and textural properties of the nanoporous materials were studied by XRD and nitrogen adsorption. The presence of carboxylic functional groups on the carbon surface was confirmed by FTIR analyses. Adsorption of 1-naphthol over various porous adsorbents such as CMMC, CMAC, MC and AC was studied. The adsorption isotherms of 1-naphthol were in agreement with a Langmuir model; moreover, the uptake capacity of 1-naphthol followed the order: CMMC>MC>CMAC>AC.
Mansoor Sheikh,Mir Javid I.,Sharma Manish,Mir Mudasir A.,Masoodi Khalid Z.,정용석 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.5
Apple is rich in secondary metabolites, which play a role in maintaining health and disease prevention. Polyphenols are the principal constituents of apples. In this study, 25 apple cultivars cultivated at the same field conditions were analyzed for their antioxidant potential and polyphenolic content. The total phenolic content of apples ranged from 7.22 to 143.57 mg GAE/100 g fw, the flavonoid content varied from 17.54 to 143.00 mg CE /100 g fw. The maximum catechin content 2310 ± 7.45 µg/g fw. The maximum epicatechin, quercetin and phloridzin content was observed in Malus Floribunda i.e., 1740 ± 5.03 µg/g fw, 5110 ± 4 93 µg/g fw, and 2170 ± 8.76 µg/g fw, respectively. Maximum content observed significant relations with catechin (r = 0.2943) epicatechin (r = 0.2597), quercetin (r = 0.3995), apigenin (r = 0.4054), phloridzin (r = 0.3329). The most significant correlation was observed between DPPH and apigenin (r = 0.4054). Principal component analysis and component score matrix show the distribution of polyphenolics between 25 apple cultivars of diverse origins. The HCA divided the cultivars into three main metabolically rich clusters. Our study elucidates the variation in antioxidant potential of different apple cultivars which could be useful for the development of new apple cultivars by conventional and modern breeders.
Synthesis and characterization of nanocomposite MCM-48-PEHA-DEA and its application as CO2 adsorbent
Mansoor Anbia,Vahid Hoseini,Sakineh Mandegarzad 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.12
Three nanocomposites containing MCM-48-35PEHA-15DEA (35 and 15 as weight percent of amine addition),MCM-48-30PEHA-20DEA and MCM-48-25PEHA-25DEA of mesoporous silica MCM-48 modified by the mixture of pentaethylenehexamine (PEHA) and diethanolamine (DEA) have been synthesized and used to study the adsorption of carbon dioxide (CO2). They are characterized by low angle x-ray diffraction (XRD), Fourier transform infrared (FT-IR) and Brunauer-Emmet-Teller (BET) analysis. MCM-48-35PEHA-15DEA (as optimized adsorbent)shows CO2 adsorption capacity of 0.51 (m·mol CO2/g-adsorbent) at 1 bar and 298 K, much higher than CO2 adsorption capacity on polyethyleneimine, pyrrolidinepropyl and polymerized aminopropyl loaded MCM-48.
Mansoor Anbia,Vahid Hoseini,Sara Sheykhi 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
Iron terephthalate, MOF-235, metal-organic framework synthesized hydrothermally and was used for gas adsorption. Resulting sample was characterized by X-ray diffraction (XRD), Brunauer–Emmet–Teller (BET) and FT-IR analysis. Adsorption properties of CH4, H2 and CO2 on MOF-235 were investigated by volumetric measurements. The absolute adsorption capacity was found in the order of CH4 >> H2 > CO2. The high CH4 adsorption capacity of MOF-235 was attributed to the high pore volume and large number of open metal sites. The high selectivity for CH4 over CO2 (14.7) and H2 (8.3), suggests that MOF-235 is a potential adsorbent for the separation of CH4 from gas mixtures.
Effects of a Recessed Camel-gate Head Structure on Normally-off AlGaN/GaN HEMTs
Mansoor Ali Khan,허준우,김영진,박현창,박형무,김현석,문재경 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.5
In this paper, a standalone camel-gate (┐) head structure has been studied to investigate the effects of the field plate (FP) in the source access region in AlGaN/GaN high electron mobility transistors (HEMTs). The camel gate serves as an FP toward the source side. Using this concept of the camel gate, the transconductance and other forward characteristics have been analyzed with regard to the T-gate. It is confirmed that the recessed camel-gate FP scaling enhances the breakdown voltage, transconductance, and output current by reducing the electric field, leakage current, and dispersion in the source access regime. Further, the optimized recessed camel-gate AlGaN/GaN HEMT is suitable for use in RF devices, as it exhibits a frequency in the order of gigahertz.
Mansoor Anbia,Sara Sheykhi 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Multi-walled carbon nanotubes (MWCNTs) incorporated MIL-53-Cu composite MOF material (MWCNT@MIL-53-Cu) has been synthesized by adding purified multi-walled carbon nanotube (MWCNT) in situ during the synthesis of MIL-53-Cu. Resulting sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmet–Teller (BET), and FT-IR analysis. Methane sorption capacities of MIL-53-Cu were observed to increase from 8.52 to 13.72 mmol g-1 at 298 K and 35 bar. The increment in the methane uptake capacities of composite MOF materials was attributed to the decrease in the pore size and enhancement of micropore volume of MIL-53-Cu by multi-walled carbon nanotube incorporation.