Study of CA-treated ZSM-22 zeolite with enhanced catalytic performance in the hydroisomerization of long-chain n-dodecane

Abstract

Pt catalysts on citric acid treated ZSM-22 zeolites exhibited enhanced n-dodecane conversion (89.7%) and C12-isomer yield (68.8%) compared with the parent ZSM-22 zeolite (19.6% and 16.4%).

Brønsted‐Acidic Mesoporous Beta Zeolite H‐MBeta Catalyzes the Conversion of Benzhydrol into Diphenylmethane and Diphenyl Ketone

“…Physically adsorbed NH3 was then removed by passing helium gas over the sample for 2 h at 120 °C, after then, the sample was heated from 120 to 530 °C at a rate of 10 °C min −1 . The pyridine‐adsorbed infrared spectrum was recorded on a Bruker TENSOR 27 spectrophotometer according to previous publication [23,24] . Scanning electron microscopy (SEM) images and transmission electron microscopy (TEM) of the samples were carried out on a SUPRA 5 field emission electron microscope and JEM 2100F microscope.…”

“…The pyridine-adsorbed infrared spectrum was recorded on a Bruker TENSOR 27 spectrophotometer according to previous publication. [23,24] Scanning electron microscopy (SEM) images and transmission electron microscopy (TEM) of the samples were carried out on a SUPRA 5 field emission electron microscope and JEM 2100F microscope.…”

Shape selectivity of zeolite for hydroisomerization of long-chain alkanes

“…Pt with strong hydrogenation/dehydrogenation capacity was used to provide sufficient hydrogenation/dehydrogenation function in this research. 27,33,34 The correlation between the zeolite pore size and the isomerization mechanism was established by analyzing the product distribution of dodecane hydroisomerization in full detail. Meanwhile, molecular dynamics (MD) simulations were carried out to study the diffusion behavior of these zeolite channels.…”

Investigation of n-heptane hydroisomerization over alkali-acid-treated hierarchical Pt/ZSM-22 zeolites

“…However, the above-mentioned alkali-acid treatment was intended to introduce only the hierarchical structure, and the hierarchical ZSM-22 supports were usually used to investigate the isomerization reaction of long-chain alkanes in diesel and lubricating oil to improve quality and lowtemperature fluidity. 23,24 To the best of the authors' knowledge, there have been seldom any systematic reports about the manipulation of hierarchical structure and morphology of ZSM-22 zeolite, simultaneously and applying to short-chain alkanes hydroisomerization reactions, especially n-heptane.…”