“…Results showed that hydroxyapatite catalyst pore size reduced with increasing the calcination temperature. Optimize biodiesel yield (89 wt%) was achieved through the process of transesterification with optimum reaction conditions of 4 wt% catalyst, oil to ethanol molar ratio of 1:7 and temperature 75 °C for 3 h reaction time. …”
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“…This study presents an approach to produce biodiesel from Elaeis guineensis using natural heterogeneous catalysts derived from raw, calcined, and acid-activated forms of waste snail shells. …”
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“…This investigation tried seeking a new approach to reuse them to high quality, including turning PG into calcinated PG (CPG) via washing and calcination, as well as adopting sodium metasilicate nonahydrate (SMN) to strengthen the roadbase materials of cement-stabilized CPG and RCA. …”
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“…The effects of the calcination temperature, ratio, initial methylene blue (MB) concentration, and catalyst dosage on the adsorption and photocatalytic performance were investigated. …”
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“…The pristine MMT and TiO(2)-MMT calcined at 800 °C (TiO(2)-MMT800) were used for comparison to better understand the immobilization mechanism. …”
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“…Here, we provide new, direct radiocarbon and physico-chemical analyses on calcined bones which elucidates the complex depositional history of the assemblage. …”
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“…The sediment in a malodorous river (PS) in Beijing, China was selected and modified via calcination (PS-D), Na(+) doping (PS-Na) and calcination–Na(+) doping (PS-DNa). …”
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“…The amorphous powders, upon a mild calcination step, gave rise to the formation of stable solid solutions of fluorite-structured ceria maintaining the same morphology of the starting powders. …”
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“…The results showed that the activating agent destroyed the crystal structure of the quartz sand under calcination, and formed Si-O-Na and Si-OH groups to realize activation. …”
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“…The ratio of coal gangue (calcined and uncalcined) coarse aggregate replacing the gravel was 0%, 30%, 50%, 70%, and 100%. …”
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“…Cobalt oxide nanoparticles (CoO NPs) were synthesized by the calcination method from the Co (II) complex which has the formula [Co(PVA)(P-ABA)(H(2)O)(3)], PVA = polyvinyl alcohol, and P-ABA = para-aminobenzoic acid. …”
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“…Besides silica fume, three different types of calcined clays were investigated as SCMs. These were a relatively pure metakaolin, a quartz-rich metakaolin, and a mixed calcined clay, where the amount of other types of clays was two times higher than the kaolinite content. …”
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“…The results show that the novel SAC-MKPC that was prepared from aluminum slag, carbide slag, coal gangue, and magnesium desulfurization slag was composed mainly of mineral MgO, [Formula: see text] , and C(2)S and the calcination temperature of the main mineral phases was 1250–1350 °C. …”
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“…NiO, Ni–Co–Mn–O(x) and NiO/Ni–Co–Mn–O(x) on nickel foam substrates were prepared via a chemical bath deposition–calcination. The thermodynamic behavior was observed by TG/DTA. …”
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“…Optimum conditions for catalyst preparation were obtained as: 15% Ni loading, 723 K calcination temperature, and 723 K reduction temperature for 2.5 h. …”
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“…Graphitic carbon nitride (g-C(3)N(4)) was prepared by high-temperature calcination of urea. A mixture of g-C(3)N(4) and nano-ZrO(2) precursor was directly calcined to prepare g-C(3)N(4)/ZrO(2) hybrid photocatalysts. …”
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“…These alkoxides were calcined at 400 °C to prepare the oxide catalysts (named as TiEt400 and TiPr400). …”
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“…The eluting efficiency of HCl was 97.5%, and the optimal parameters of the precipitation and calcination processes were set as pH 5, NH(4)Cl:V = 2:1, and 350 °C. …”
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“…X-ray diffraction of the powders calcined by the microwave process shows the formation of perovskite structure with orthorhombic geometry, but it is possible to observe the presence of other phases. …”
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“…Metakaolin was obtained by calcination of kaolin at 750 °C for 1 h while geopolymer samples were calcined at 900 °C, which is the key transition temperature. …”
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