Authors:Yue Yao, Jianhong Wang, Yanyan Deng, and Jun Wang
include SAPO molecular sieves [ 6 , 7 ], Y zeolite [ 8 , 9 ], βzeolite [ 10 , 11 ], SO 4 2− /ZrO 2 [ 12 , 13 ] and heteropolyacids [ 14 , 15 ], among which, the three-dimensional 12-membered ring βzeolite is known as one of the most effective
Authors:Ping Liu, Xingguang Zhang, Yue Yao, and Jun Wang
Alkaline earth metal (Mg, Ca, Sr and Ba) ions were exchanged into Hβ zeolite, which were used as the supports to load the
noble metal Pt to prepare bifunctional catalysts for hydroisomerization of n-heptane. The catalysts were characterized by ICP, XRD, BET, NH3-TPD, H2-TPR and H2-chemisorption techniques, and evaluated in an atmospheric fixed bed reactor. The catalysts promoted by the alkaline earth
metals are revealed to present much higher selectivity to isomerization than the counterpart Pt/Hβ. Moreover, the Ba-bearing
catalyst loaded with 0.4 wt% Pt and 5:1 molar ratio of Ba to Pt gives a very high selectivity to iso-heptanes 95.4% with a
considerable high conversion of n-heptane 61.7%. The promotion effect of alkaline earth metals is briefly discussed in relation to characterization data.
Authors:F. Genoni, G. Casati, S. Palmery, G. Spanò, R. Buzzoni, G. Girotti, and F. Rivetti
An accurate description of coke burn off is obtained from a catalyst based on β-zeolite and used for benzene alkylation with
propylene giving cumene by using the thermogravimetric technique.
A simple empirical kinetic model was successfully applied to interpolate the data of thermogravimetric analysis performed
on samples after partial burn off.
Different temperatures, partial pressures of oxygen and gas flow rates were the variables studied in order to calculate the
apparent rates and the activation energy for the coke oxidation reaction and to outline the best conditions for the industrial
regeneration procedure of our proprietary catalyst PBE-1 for cumene synthesis. Combining the unusually long lifetime per reaction
cycle with the optimized regeneration procedure leads to an outstanding overall catalyst life.
β-MCM41 composite molecular sieves were hydrothermally synthesized using NaOH treated β zeolite as precursors, and Pt/β-MCM41
bifunctional catalysts were prepared by impregnation. Hβ, desilicated Hβ by NaOH treatment (Dβ), and the physical mixture
of Hβ and MCM41 (β+MCM41) were also used as control supports for bifunctional catalysts. All the catalysts were characterized
by ICP, XRD, BET, nitrogen adsorption–desorption isotherm and NH3-TPD, and evaluated in the hydroisomerization of n-heptane using an atmospheric fixed bed flow reactor. Dβ, β+MCM41, or β-MCM41 supported Pt catalysts showed higher selectivity
to isoheptanes than the counterpart Pt/Hβ did due to the presence of mesopores in addition to the zeolite micropores. Moreover,
Pt/β-MCM41 was demonstrated to be a much more selective catalyst among them because the connection between mesopores and micropores
accelerated the diffusion of larger molecules of isoheptanes. Under optimal conditions, Pt/β-MCM41 provided a very high selectivity
to isomerization of 96.5%, coupled with a considerable high conversion of n-heptane of 56.0%.
Authors:Bianca V. Sousa, Karoline D. Brito, José J. N. Alves, Meiry G. F. Rodrigues, Carlos M. N. Yoshioka, and Dilson Cardoso
, regardless of the fact that it shows reduced selectivity and stability compared with βzeolite and mazzita [ 1 , 9 ]. According to Rabo [ 16 ], mordenite is excellent for hydroisomerization reactions because its cations are easily replaced by ammonium ions