Selective Adsorptive Desulfurization with Alkaline-Earth Metal-Modified Zeolites in Oil in the Presence of Olefin.

Adsorptive desulfurization (ADS) was a hopeful method for deep desulfurization of oil in mild conditions. In this paper, based on the alkaline-earth (AE) metal-modified Y zeolite (AEY), synthesis, systematic characterization, ADS performance test, and analysis of related adsorption mechanisms were carried out. The crystal and pore structure of Y zeolite were not damaged after ion exchange of AE, while the amount of acid sites and the ratio of Lewis/Bronsted acid sites were both decreased. Although surface acid sites on zeolites were believed to be active sites for ADS, the performance test results showed that AEY adsorbents had rather good S adsorption capacity compared to NaY. Moreover, the S adsorption selectivity in the presence of hexene-1 in oil was also desirable for all AEY adsorbents. Based on these experimental results and previously proposed mechanisms for S-containing compound adsorption, a new adsorption mechanism was proposed for AEY, and this mechanism was further supported by the aid of DFT calculations. The good S-removal performance of AEY adsorbents as well as the new proposed adsorption mechanism may help people design and synthesize further improved S-compound adsorbents for ADS processes in an oil refinery.

Supported Ni Catalysts: Simple Vapor Deposition Preparation Method and Improved Catalytic Performance for Oxidative Dehydrogenation of Ethane.

Developing new methods of catalyst preparation is one of the most important tasks in the field of catalysis. A simple one-tube vapor deposition (VD) is provided in this paper for preparing the supported Ni catalyst. Ni(acac)2 was used as the Ni precursor. This preparation method was successfully applied to three types of catalytic supports, that is, Al2O3 and zeolites 5A and Hß. Varying Ni contents of less than 8 wt % can be obtained by employing different conditions. The Ni content, depending on different deposition conditions, was preliminarily explored. The catalytic performance for oxidative dehydrogenation of ethane (ODHE) was tested for the prepared Ni catalysts by the VD method. Several cases of catalytic tests showed that for the same Ni content, the VD-prepared Ni catalyst presented better performance for ODHE than the one prepared by a traditional impregnation method. Besides the improvement in catalytic performance, several advantages of our VD preparation method for catalysis are discussed.