Photo-degradation of acid green dye over Co–ZSM-5 catalysts prepared by incipient wetness impregnation technique

Fischer–Tropsch Synthesis Using Zeolite-supported Iron Catalysts for the Production of Light Hydrocarbons

“…It appears that the catalysts were disintegrated, at least partially, during the reaction. This may be due to coagulation of iron moieties prepared by impregnation, with a consequent increase in cell volume than that of the original zeolite, as reported by El Bahy et al [25]. The situation is better in the case of ZSM-5 supported system in the present case, wherein some of the diffraction lines are clearly visible.…”

Aerobic oxidation of 4-tert-butyltoluene over cobalt and manganese supported hexagonal mesoporous silicas as heterogeneous catalysts

“…For the Co containing samples, the diffraction peaks at 2Â ca. 31 • , 37 • , 45 • , 60 • and 65 • , corresponding to (2 2 0), (3 1 1), (4 0 0), (5 1 1) and (4 4 0) reflections were discerned, which was a typical feature of Co 3 O 4 in agreement with the previous reports [44][45][46] and the UV-vis data presented above. The diameter of Co 3 O 4 crystallites calculated from the width of the (3 1 1) diffraction peak are shown in Table 1 This may be due to that high Mn amount and more calcination times favor agglomeration of supported cobalt oxide particles.…”

Photodecolorization of Eriochrome Black T using NiS–P zeolite as a heterogeneous catalyst

“…It can be concluded that the decolorization process does not occur in the presence of NiS. The role of the zeolite might be correlated with the adsorption process, in the sense of high surface area and the decrease of particle size [31]. In our idea, in the absence of zeolite, NiS particles tend to aggregate that causes a decrease in active surface sites.…”

“…According to atomic absorption result of nickel determination, their NiS contents were 2.1, 3.7 and 4.3%, respectively. Many authors reported that the kinetic behavior of photocatalytic reaction obey the first-order reaction [2,31]. In order to confirm the speculation, ln(C/C 0 ) was plotted as a function of the irradiation time.…”

“…So the overall number of the photons that can be reached to catalyst particles and the production of OH radicals are decreased with the loading of the catalyst [2]. Another reason may be due to the aggregation of solid particles while using large amount of catalyst was used [31]. Also, Fig.…”