Synthesis and Crystal Structure of Zeolite RUB-41 Obtained as Calcination Product of a Layered Precursor: a Systematic Approach to a New Synthesis Route

Abstract

Zeolite RUB-41, framework type code RRO, having a new framework structure has been synthesized as a calcination product using a layered silicate, RUB-39, as precursor. The precursor was obtained from hydrothermal synthesis using dimethyldipropylammonium hydroxide as structure directing agent. RUB-41, 18SiO2 per unit cell, crystallizes in the monoclinic space group P2/c with a = 7.345(1) Å, b = 8.724(1) Å, c = 17.125(1) Å, and β = 114.2(1)°. The material has a 2-dimensional channel system with intersecting 8- and 10-membered ring pores. The pore openings determined from structure analysis are 5.8 Å × 4.1 Å (8MR) and 5.9 Å × 4.1 Å (10MR). The surface area determined from nitrogen adsorption experiments is 510 m2/g and the pore space is accessible for linear molecules. The material shows high sorption interaction for C4 alkenes and excludes i-butane from the pore system.