Authors:Jianli Zhang, Subing Fan, Tiansheng Zhao, Wenhuai Li, and Yuhan Sun
–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
Authors:Pawel Mierczynski, Tomasz P. Maniecki, Waldemar Maniukiewicz, and Wojciech K. Jozwiak
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
Authors:Yuelun Wang, Bo Hou, Jiangang Chen, and Yuhan Sun
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
Authors:Yuelun Wang, Bo Hou, Debao Li, Jiangang Chen, and Yuhan Sun
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
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
Authors:Bijan Barghi, Moslem Fattahi, and Farhad Khorasheh
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