Preparation, surface acidity and catalytic performance of Beta/ZSM-5 composite molecular sieve

Rich-O-Vacancy WO3/ZrO2–Hβ with High Lewis/Brønsted Ratio: An Efficient Catalyst for the Highly Selective Synthesis of Dipropylene Glycol

“…The FT-IR spectra of x WO 3 /20ZrO 2 –Hβ are shown in Figure b. The bands at 569, 521, and 459 cm –1 were detected in the spectra of all catalysts, attributed to the vibration of the double ring structure and pore structure of Hβ zeolite . It indicated that the majority of the frames of Hβ zeolite were maintained after loading WO 3 .…”

“…The bands at 569, 521, and 459 cm −1 were detected in the spectra of all catalysts, attributed to the vibration of the double ring structure and pore structure of Hβ zeolite. 36 It indicated that the majority of the frames of Hβ zeolite were maintained after loading WO 3 . The band at 903−894 cm −1 was detected in the spectra of xWO 3 /20ZrO 2 −Hβ after the loading of WO 3 , which was attributed to the Si−O−W vibration.…”

Research progress on adsorption and separation of carbonyl sulfide in blast furnace gas

“…[79][80][81] Some studies have pointed out that the micropores in the molecular sieve provide the active sites for adsorption, and the mesopores increase the diffusion rate of the reaction. 82 In addition to preparing molecular sieves with different pore sizes, the adsorption effect of molecular sieves can also be improved by surface modication. The cations on the molecular sieve framework can be replaced with other metal ions, to adjust the pore size, surface activity and other properties of the molecular sieve, and further improve the adsorption capacity and selectivity of the molecular sieve.…”

Isomerization of n-Dodecane for High Selectivity of Multibranched Iso-dodecane over Pt/ZSM-22 – Y Catalyst

“…To improve the catalytic performance, bifunctional catalysts with mixed acidic supports were also studied. ,− In particular, the development of composite molecular sieves has become a research hot spot. , For example, a series of composite molecular sieves, such as Pt/Beta-MCM-41, Pt/MOR-MCM-4, Pt/beta-KIT-6, and Pt/HZSM-5-HMS, were prepared and applied in hydroisomerization of n -alkanes. Since these composite molecular sieves own a reasonable distribution of acidity, good shape selectivity, and hydrothermal stability, they generally exhibit higher selectivity, stability, and activity than those of the corresponding single molecular sieves.…”