Yueli Wen

The Dehydration of Methanol to Dimethyl Ether over a Novel Solid Acid-base Catalyst

A novel polymer solid acid-base catalyst Cat-AAA (Al + aminoacetic acid) with aluminum and nitrogen was prepared from aminoacetic acid and Al by using triblock copolymer Pluronic F127 as a template via evaporation induced organic–organic assembly method. Cat-AAA was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectra. The acid-base properties of the catalysts were determined by temperature programmed desorption using CO2 and NH3 as probe molecules. The dehydration of methanol to dimethyl ether over Cat-AAA had been studied; the results showed that the conversion of methanol and selectivity of dimethyl ether is higher at a high reaction temperature. The key requirements for a good catalyst for dehydration of methanol to dimethyl ether are: (i) weak acid-sites activate O in a methanol molecule; (ii) at the same time, weak base-sites activate H of hydroxy group in another methanol molecule.

Synthesis and application of novel solid acid-base catalysts for side chain alkylation of toluene with methanol

Novel solid acid-base catalysts with aluminum and nitrogen were prepared from phenolic compounds and formaldehyde by using triblock copolymer Pluronic F127 as a template via evaporation induced organic-organic assembly method. The catalysts were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectra (XPS). The acid-base properties of the catalyst were determined by temperature programmed desorption (TPD) using CO2 and NH3 as probe molecules. The side chain alkylation of toluene with methanol over the catalyst was studied, the results demonstrated that the catalyst Cat-TDMMP was of the higher activity [(ethylbenzene + styrene) yield was 41.0%] than the conventional alkali exchanged zeolites [(ethylbenzene + styrene) yield was about 20%]. This fact may due to the strength and distance of the specific surface acid-base pairs of the catalyst, which are favored to bimolecular side-chain alkylation reaction.

Synthesis of novel polymer as solid acid-base catalyst for styrene from toluene

A novel solid acid-base catalyst Cat-NH2C2H4NH2 with aluminum and nitrogen was prepared from phenol and formaldehyde by using triblock copolymer Pluronic F127 as a template and resol as a catalyst precursor via evaporation induced organic-organic assembly method. The catalyst was characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectra (XPS). The acid-base properties of the catalyst were determined by temperature programmed desorption (TPD) using CO2 and NH3 as probe molecules. The side chain alkylation of toluene with methanol over the catalysts had been studied. The results showed that Cat-NH2C2H4NH2 has demonstrated the higher activity and selectivity than the conventional alkali exchanged zeolites. This may be because that the weak or middle acid-base pairs on the catalyst are favored to bimolecular side-chain alkylation reaction.

Styrene from Toluene by Side Chain Alkylation over a Novel Solid Acid-base Catalyst

Abstract A novel solid acid-base catalyst with aluminum and nitrogen was prepared from aluminum and amine by using triblock copolymer Pluronic F127 as a template and resol as a framework via evaporation-induced organic–organic assembly method. The catalyst was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectra. The acid-base properties of the catalyst were determined by temperature-programmed desorption using CO2 and NH3 as probe molecules, and the side chain alkylation of toluene with methanol over the catalyst has been investigated. The results show that the catalyst demonstrates the higher activity and selectivity.

Side-chain Alkylation of Toluene With Methanol over a Novel Solid Acid-base Catalyst

Abstract A novel solid acid-base catalyst Cat-NH(CH3)2 with aluminum and nitrogen was prepared from phenol and formaldehyde by using the triblock copolymer Pluronic F127 as a template and resol as a catalyst precursor via evaporation induced by the organic–organic assembly method. The catalyst was characterized by Fourier transform infrared spectroscopy and X-ray diffraction. The base properties of the catalyst were determined by temperature programmed desorption using CO2 as a probe molecule. The side chain alkylation of toluene with methanol over the catalyst had been studied, the results showed that Cat-NH(CH3)2 has demonstrated a higher activity and selectivity than the alkali exchanged zeolites. This may be because the strength of the specific surface base sites of this catalyst is favored to bimolecular side-chain alkylation reaction.