| 论文简介 |
Abstract: The La/beta molecular sieve catalyst was prepared by the ion-exchange method using microwave heating and conventional heating. The catalyst was characterized by infrared spectroscopy, scanning electron microscopy, X-ray, diffraction, and energy dispersive spectroscopy. Hydration and etherification reactions of isobutylene with an ethanol-water mixture to produce a fuel mixture were carried out over these catalysts. The effects of the preparation method and La loading on the catalytic performance of La/beta catalysts were studied, and the reaction mechanism was proposed. The results indicated that the ion-exchange degree and La loading of the La/beta catalyst prepared by the microwave heating method were higher than the one prepared by the conventional heating method, and the ion-exchange time was shorter. The conversion of water and ethanol over the modified La/beta molecular sieve catalyst was increased by 10% similar to 20% compared with the unmodified H beta molecular sieve, and the catalyst activity increased with the La loading. The hydration and the etherification mainly occurred on the external surface of the beta molecular sieve catalyst. Bridging Al-OH-Si acid sites, i.e., Bronsted acid sites, were the main active sites, and the carbonium ion was formed during the reaction. |
(创新港)
