Donald S. Santilli

Zeolite SSZ-26

A crystalline zeolite SSZ-26 is prepared using a hexamethyl [4.3.3.0] propellane-8,11-diammonium cation as a template. Also disclosed is a process for converting hydrocarbons with crystalline zeolite SSZ-26.

Inverse shape selectivity in molecular sieves: Observations, modelling, and predictions

Abstract Zeolites with 7–7.4 A pores selectively adsorb and, during cracking reactions, produce branched C6 alkanes. This selectivity for adsorbing branched alkanes over linear ones is caused by attractive forces between the zeolite walls and the adsorbed hydrocarbons. During hydrocracking reactions catalysed by these zeolites, it is likely that stabilizing interactions between the walls and the methyl-branched transition states lead to the selective formation of branched products. We call this preference for adsorbing or producing branched hydrocarbons “inverse shape selectivity”. Competitive adsorption of hydrocarbons was successfully modelled by Monte Carlo methods. These calculations simulated the inverse shape selectivity observed in actual zeolite structures with 6.5 to 7.3 A pores and predict that inverse shape selectivity can be found in pores up to at least 8 A in diameter but not in pores larger than 9 A. The ability to model these observations allows us to predict the efficacy of as yet untested or hypothetical zeolite structures for promoting the selective adsorption of branched C6 alkanes.

Zeolite ssz-41

The present invention relates to new crystalline zeolite SSZ-41 which comprises oxides of (1) silicon or a mixture of silicon and germanium, and (2) zinc, said zinc being present in an amount from about 2 wt % to about 5 wt % of zinc metal based on the total weight of metals in said zeolite. Zeolite SSZ-41 may also optionally contain oxides of aluminum, iron, gallium or mixtures thereof. Zeolite SSZ-41 has the X-ray diffraction lines of Table I and has an argon adsorption capacity of at least about 0.06 g/g argon at 87° K. Also disclosed are methods of making and using zeolite SSZ-41.

Synthesis of 2,6-dimethylnaphthalene from pentenes and toluene

Abstract We report a new technology of more efficiently synthesizing 2,6-dimethylnaphthalene (2,6-DMN) by using pentenes and toluene as low cost feedstocks. The output of 2,6-DMN is maximized and a new technical breakthrough has been made by developing new chemistry with zeolite-based catalysts via a novel hydroisomerization-dehydrogenation sequence.