Steam Catalytic Cracking of n-Dodecane over Ni and Ni/Co Bimetallic Catalyst Supported on Hierarchical BEA Zeolite

Abstract

Steam catalytic cracking was performed over metal modified BEA zeolite. Nickel and cobalt were introduced to the desilicated BEA zeolite by substitution treatment. The method of metal incorporation used here allowed incorporation of the metal(s) into the framework matrix of BEA in tetrahedral form together with the external surface. The successful incorporation of nickel/cobalt into the BEA framework in tetrahedral form was confirmed from FTIR spectra and UV–vis. The quantity of metals attached to BEA zeolite was calculated by EDX. The changes and defects of the BEA structure were studied from XRD patterns and SEM micrographs. The metal incorporation significantly increased the total acidity, as confirmed by NH3-TPD and pyridine FTIR analysis. The attachment of metals considerably increased the conversion of n-dodecane as compared to the parent sample. The stability of BEA zeolite was also enhanced significantly. However, the addition of Co to Ni incorporated BEA zeolite had a negative effect on both n-dodecane conversion and BEA stability.

Metal and acid sites instantaneously prepared over Ni/SAPO-11 bifunctional catalyst

“…UV-vis diffuse reflectance spectra of the calcined catalysts are shown in Fig. 2 in framework of the SAPO-11 [39][40][41]; the peak at 400 nm (Fig. 2 (b)) is assigned to the octahedrally coordinated nickel species in nickel aluminate spinel [42,43].…”

Synthesis of Azoxybenzenes by Selective Oxidation of Anilines on Titanium Silicate Molecular Sieves

“…The precipitate was collected, dried in the oven at 393 K, and calcined in a muffle furnace at 823 K for 16 h. The supported metal (Al, Fe, and Mg) catalyst was synthesized by an impregnation method. [16] First, the above TS-1 sample was kept dry in dryer. -1 was used, and the TS-1 (1 g) was impregnated into the support under room temperature for 2 h. Then, the catalyst was dried in an oven for 6 h at 120 ℃ to remove water.…”

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

“…[339] The second group of desilication strategies includes template-free alkaline treatments and has been employed by several groups. In general, most research groups employ a 0.2 m NaOH solution as desilication agent, [340][341][342][343][344] while the effect of other synthesis parameters was explored. For instance, Dos Santos et al investigated the influence of temperature and treatment time on the synthesis outcome.…”