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in zeolites are very significant performances for understanding these processes of zeolite applications, especially the catalytic performance of chemical reaction over zeolites. However, adsorption and diffusion limitations are often observed when the processes involve large molecules [4]. To alleviate this, hierarchical porous materials have attracted a wide spread attention with the advantages of enhancing the mass transfer and improving the accessibility of the molecules in intracrystalline. There are different approaches to synthesize hierarchical zeolites. Among which, introducing mesopores into the original structure of microporous zeolites is one of the most efficient methods [5–7]. Such mesostructured zeolite materials have not only the advantages of micropores, which ensure acidity and shape selectivity, but also the advantages of mesopores, which promote the adsorption of molecules [8–10] and diffusion rate for mass transfer within zeolites [8,11–13]. As zeolite Beta has large window diameter and strong acidic sites, it has become a member of zeolitic materials of great substantial industrial importance, displaying unique catalytic reactivity in chemical reactions of hydrocarbons. Beta zeolite belongs to a complex intergrowth family, which consists of two (polymorph A and B) or more polymorphs [14]. It is a high-silica zeolite with three-dimension channel system and consists of straight ring channels of a free aperture of 0.76 × 0.64 nm and zig-zag ring channels of 0.55 × 0.55 nm which are similar to other large-pore molecular sieves such as FAU and EMT zeolites. Even Beta zeolite can be classified as a large pore zeolite with a 12-ring structure, it still suffers from strong steric and diffusion limitations from crystal sizes in the micrometer range in a number of catalytic reactions with participation of bulky molecules [15]. Thus, it is of prime importance to develop mesoporous Beta zeolite which can improve the catalytic activities substantially in various organic reactions involving large molecules compared with microporous Beta zeolites. Three xylene isomers, namely o-xylene, m-xylene and p-xylene, are very important basic chemicals and find wide and various applications in chemical industry. Mixed xylenes are produced from petroleum by various catalytic reactions. However, as a result of important application to individual xylene isomers, it is necessary that mixed xylene is separated out through adsorption separation and isomerization reaction processes to obtain desired xylene isomers. In fact, the remarkable advances in p-xylene production from m-xylene isomerization using zeolite catalyst have been achieved over the last several decades [16–20]; meanwhile, the separation of xylene isomers through zeolite adsorbents has also gained considerable interest. The great success of zeolites as catalysts and adsorbents is exactly due to their unique shape selective properties from pore structure [21,22]. Shape-selective conversion and separation of xylenes over zeolites can be attributed the differences in the adsorptions and diffusivities of the three xylene isomers in the zeolite structures. 240PDF Image | Zeolite Catalysis
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