http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Role of ceria in CO2 adsorption on NaZSM-5 synthesized using rice husk ash
PUSHPARAJHEMALATHA,Margandan Bhagiyalakshmi,Mani Ganesh,Muthaihpillai Palanichamy,Velayutham Murugesan,장현태 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Ceria (3, 5, 7, 11, 19 wt%) impregnated NaZSM-5 was synthesized and studied for adsorption of CO2. They were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive Xray analysis (EDS), CO2-temperature programmed desorption (CO2-TPD) and Brunauer–Emmett–Teller (BET) techniques. The heat of the reaction (DHr) derived from differential scanning calorimetry (DSC)analysis was 490 Btu/lb. XRD analysis showed a decrease in the intensity of patterns with the increase in the ceria loading but crystallization of ceria to larger size was clearly evident for 11 and 19% loading. The surface area decreased for 3 and 5% loading, but increased for 7, 11 and 19% loading illustrating difference in dispersion. The maximum adsorption capacity of CeO2(5%)/NaZSM-5 was 130 mg/g of sorbent. Extraction of silica from the agricultural waste, rice husk, and its use in the zeolite synthesis was an advantage in this study. Hence, from the study it was concluded that ceria impregnated NaZSM-5 could be treated as a novel material for CO2 adsorption, as they were regenerable and recyclable. This study can also be applied to all other zeolites.
Margandan Bhagiyalakshmi,장현태,PUSHPARAJHEMALATHA,Mani Ganesh,Mei Mei Peng 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3
Copper-encapsulated heteropolyacid-impregnated mesoporous MCM-48 (Cu-HPA-MCM-48) with copper in a reduced state was synthesized, and the CO_2 adsorption capacity was monitored. The synthesized material was characterized by XRD, N_2 adsorption–desorption, FT-IR, DSC, CO_2-TPD and XPS. The low angle X-ray diffraction pattern of the Cu-HPA-MCM-48 demonstrates the encapsulation of copper inside the pore by the disappearance of higher-order peaks. This result is further supported by the presence of Cu_(2p)^3 andW4f peaks in XPS. The CO_2 adsorption capacity of Cu-HPA-MCM-48was 70 mg/g at 25℃. The energy of desorption and the heat of the reaction (DHr) were 21.2 kJ/mol and 490 Btu/lb,respectively, as determined by CO_2-TPD and DSC. As the DHr value of Cu-HPA-MCM-48 approaches the CO_2 benchmark value (580 Btu/lb), the catalyst exhibited improved CO_2 capturing capacity.
Mani Ganesh,Krishnan Rajasekar,PUSHPARAJHEMALATHA,Peng Mei Mei,장현태 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
A new type of mesoporous silica nanoparticle (MSN) was synthesized in fluoride media via sol–gel technique using TritonX 100 and Tween-20. The surface area and pore volume of the MSN particles were modified by varying the concentration of Tween-20. The prepared MSN nanoparticles with large surface area and pore volume (T-2, T-3) were selected to accommodate the model drug duloxetine hydrochloride (DX) for evaluation of their drug-loading and release abilities. Calcined and DX loaded nanoparticles were characterized by Brunauer–Emmett–Teller technique (BET), powder X-ray diffraction (XRD),scanning electron microscopy (SEM), thermogravimetric (TG) analysis and UV-diffuse reflectance (UVDRS). In vitro release studies proved that the particle displays an initial burst release followed by sustained release for up to 140 h. From the studies it is evident that the synthesized particle may be useful as a carrier for sustained release of active pharmaceutical ingredients (APIs).