http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Sadaf Ul Hassan,Sadaf Ahmad,Muhammad Asim Farid,Sohail Nadeem,Zulfiqar Ali,Rashid Abro,Aysha Mohyuddin,Muhammad Shahid Nazir,Murid Hussain,박영권 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
Hydrodesulfurization is a common but less effective technique to remove sulfur content of oils due to severe operating conditions of temperature, pressure and cost. Oxidative desulfurization(ODS) is preferable due to low cost and mild operating conditions. Coupling of the extractive catalytic desulfurization with the ODS give rise to extractive catalytic oxidative desulfurization(ECODS), a more promising for the elimination of sulfur contents of fuel oil. Herein we present by polyoxometalate based hybrids, [H2TPP][K5BVW11O40]•2CH3CN•2H2O (1), [H2TPP]2[K3BVW11O40]•CH3CN•3H2O (2), and [H2TPP]3[KBVW11O40]•2CH3CN (3) for efficient ECODS of hazardous model fuel. These were synthesized by facile method and characterized by elemental analysis, inductive couple plasma, powder X-ray diffraction analysis, thermo-gravimetric/differential thermal analysis, fourier transform infrared, and UV–visible analysis. These polyoxometalate based hybrids contain cations [H2TPP]2+(organic) and [BVW11O40]7−(inorganic) with stoichiometric ratios(i.e., 1:1, 2:1, 3:1). The stoichiometry of these hybrids was also established by Job’s analysis which agreed well with the results of TG-DTA and elemental analyses. Interestingly, an increase in catalytic efficiency is observed with increase of organic cations. The maximum ∼99.5 % conversion of dibenzothiophene at 60 °C after 2 h has been achieved with hybrid 3 which could be employed up to ten cycles without a significant decrease in efficiency.
Structural, Magnetic and Dielectric Properties of Perovskite (Tb0.874Mn0.106)Mn1-xNixO3-δ
Muhammad Asim Farid,Guobao Li,Jianhua Lin,Attia Firdous,Sadaf ul Hassan 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.3
(Tb 0.874 Mn 0.106 )Mn 1− x Ni x O 3−δ (0.0 ≤ x ≤ 0.20) solid solutions have been synthesized by solid state method. They all crystallizein orthorhombic Pnma space group with perovskite structure at room temperature. The unit cell volume decreases with anincrease of Ni in (Tb 0.874 Mn 0.106 )Mn 0.80 Ni 0.20 O 3−δ . The samples show two magnetic orderings. The temperature dependentdielectric constant shows an abnormal step like increase for all the solid solutions. The dielectric constants decrease withan increase in frequency. The activation energies calculated from dielectric loss are related to the oxygen vacancies in thesamples.
Akhter Parveen,Bhatti Taseer Yasrab,Shafiq Iqrash,Jamil Farrukh,Nazar Rabia,Nazir Muhammad Shahid,Hassan Sadaf Ul,Hussain Murid,박영권 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.12
Sea buckthorn (SBT) combines very fascinating nutritional composition with vital vitamins (A, C, E, D, K, and B complexes). Flavonoids, sterols, α-carotene, linoleic acid, and many more unsaturated fatty acids are present in the sea buckthorn plant. The organic extract of SBT seeds is commonly utilized as an anti-aging ingredient in numerous cosmetics. SBT oil extracts are used in pharmaceuticals that treat diseases like diabetes, cancer, cardiovascular disease, and neurological disorders, in addition to cosmetology. In this investigation, various concentrations of organic solvents such as n-hexane, isopropyl alcohol, ethyl acetate, ethanol, methanol, and ascorbic acid (standard) were used for the extraction of oil from sea buckthorn seeds. The antioxidant activity of such extracts was checked by the iron chelating, commonly known as the ferric chloride (FeCl3) method, which is based on the ferric reducing ability of plasma (FRAP) assay with the help of UV-Vis. Our results indicate that seed extract of Hippophae rhamnoides, should be considered as a non-toxic source and the ferric reducing ability of plasma (FRAP) assay is used to evaluate the anti-oxidant potential by various organic solvents. The highest (68%) of FRAP is scavenged by the ethyl acetate and least (53%) of isopropyl extracts.