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–manganese spinel phases appeared in the bulk as the carbon content increased, implying that the samples were gradually reduced during calcination. At high carbon content (S 4 –S 6 ), the intensity of the peaks became weaker and broader as the carbon content

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mono-oxides (strongly disordered γ-Al 2 O 3 , α-Cr 2 O 3 phases with low crystallinity and CuO) bi-oxide phases, copper chromite spinel-like structure CuCr 2 O 4 [ 10 – 12 ] and Al 1.54 O 3 Cr 0.46 [ 13 ] were observed. The presence of the identified

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diameter All catalysts showed the characteristic peaks of Co 3 O 4 spinel at 2θ = 36.7° (see Fig. 3 ). Obviously, the silica structures could significantly affect the average crystallite size of supported Co 3 O 4

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numerous open pores and resulting in irregular changes in pore structure. XRD patterns of two series of catalysts are shown in Fig. 1 . All catalysts showed the characteristic peaks of spinel Co 3 O 4 phase at 36.7°. The weaker diffraction peaks

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Reaction Kinetics, Mechanisms and Catalysis
Authors: Soipatta Soisuwan, Benjamas Netiworaruksa, Channarong Charoendechanukor, Tassanee Tubcharoen, Joongjai Panpranot, and Piyasan Praserthdam

modification on zirconia support synthesized by different routes and Co/La 2 O 3 The TPR profiles of all the catalysts are shown in Fig. 4 and the reduction temperature are listed in Table 2 . The spinel Co 3 O 4

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] γ-Al 2 O 3 Cu/ZnO/Al 2 O 3 , CuB 2 O 4 (spinels) (B = Mn, Al, Fe, Cr) 250–450 [ 21 ] Al 2 O 3 , Ga 2 O 3 , Ga 2 O 3 –Al 2 O 3

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suppress coke formation and under operation and regeneration, the promoted platinum supported on zinc aluminate spinels has shown good activity and stability [ 9 – 11 ]. As the catalyst is progressively coked, the modifiers play an important role in

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