Selective Production of Phenol on Bifunctional, Hierarchical ZSM-5 Zeolites

Abstract

Mono- and bimetallic Ni-, Ru- and Pt-modified hierarchical ZSM-5 materials were prepared by impregnation technique and characterized by X-ray diffraction (XRD), N2 physisorption, temperature-programmed reduction (TPR–TGA), ATR–FTIR and solid state NMR spectroscopy. Formation of finely dispersed nickel, ruthenium and platinum species was observed on the bimetallic catalysts. It was found that the peculiarity of the used zeolite structure and the modification procedure determine the type of formed metal oxides and their dispersion and reducibility. The samples’ acidity was studied via FTIR spectroscopy of adsorbed pyridine. The changes in the zeolite structure were studied via solid-state NMR spectroscopy. The catalysts were investigated in a gas-phase hydrodeoxygenation, transalkylation and dealkylation reaction of model lignin derivative molecules for phenol production.

An efficient green protocol for the synthesis of 1,2,4,5-tetrasubstituted imidazoles in the presence of ZSM-11 zeolite as a reusable catalyst

“… 29,45–48 Pyridine-IR spectra of a series of ZSM-11 zeolites show that the peaks intensity of Lewis acid sites and Brønsted acid sites increases with time from 18 h to 48 h. Hence, we conclude that the percentage insertion of aluminum was increased in the framework of zeolites by increasing time from 18 to 48 h, due to which the acidity of zeolites increased simultaneously. 46,49 …”

A comparison of Ni, Pt, and NiPt catalysts supported on SBA-15 in anisole hydrodeoxygenation: Exploring the effect of platinum addition to a nickel catalyst

“…Bimetallic NiPt catalysts supported on hierarchical ZSM-5 materials were investigated in a gas-phase hydrodeoxygenation, transalkylation and dealkylation reaction of model lignin derivative molecules for phenol production. [26] Among the studied catalysts, 10Ni1Pt/Z-h showed the highest activity and selectivity for phenol production, which was attributed to the additive effect of Pt related to the increase in the metal dispersion and enhancement of NiO reducibility.…”

CO2 Hydrogenation to Renewable Methane on Ni/Ru Modified ZSM-5 Zeolites: The Role of the Preparation Procedure

“…Even with double nickel content, the N size did not increase. It is highly probable, based on our former study [16] metal ions was incorporated into the lattice cationic positions of zeolite.…”