Abstract: An aluminosilicate molecular sieve catalyst, its preparation and application thereof are provided. The catalyst shows a desorption curve having three peaks P1, P2 and P3 in its NH3-TPD pattern. The desorption temperatures corresponding to the summits of the three peaks P1, P2 and P3 are respectively in a range of 180-220° C., 250-290° C. and 370-410° C. The catalyst shows a higher activity, selectivity and stability when used for producing alkylaromatic hydrocarbons by gas-phase alkylation of aromatics with olefins.

Abstract: This invention relates to a molecular sieve, especially a SCM-1 molecular sieve or SCM-2 molecular sieve of the MWW family as represented in FIGS. 1 and 2. As compared with a prior art molecular sieve, the molecular sieve according to this invention exhibits improved catalytic performance and good service life and regeneration performance. The molecular sieve can be produced with a simplified procedure, under mild operation conditions, with less energy and material consumption and fewer side reactions, with a high product purity at low cost and a high yield. This invention further relates to a process for producing these molecular sieves and use thereof as an adsorbent or a catalyst.

Abstract: This invention relates to a molecular sieve, which has a specific XRD diffraction pattern and a specific layered structure. As compared with a prior art molecular sieve, the molecular sieve according to this invention exhibits improved catalytic performances and good service life and regeneration performance. The molecular sieve can be produced with a simplified procedure, under mild operation conditions, with less energy and material consumption and less side reactions, with a high product purity at low cost and a high yield. The molecular sieve according to this invention is especially suitable for use as an adsorbent or a catalyst.