In this study the catalytic dehydrogenation of ethylbenzene to styrene was investigated in a simulated tubular sodalite membrane reactor. The high quality microporous sodalite membrane was synthesized by direct hydrothermal method and characterized by single gas permeation measurements. The performance of the prepared membrane showed high potential for application in a dehydrogenation membrane ...

Zeolite Rho is able to successfully separate CO(2) from CH(4) with the highest selectivity ever observed on the basis of pore diameter and surface polarity. The adsorption of CO(2) provokes structural changes in the zeolite Rho.

This paper investigates the composition, properties and reactivity of a red mud waste generated in Saudi Arabia with view to find alternative materials replace construction binders high environmental impact. The phase transformation triggered by sintering RM up 1000°C is determined thermal X-Ray Diffraction analyses. Reactivity investigated chemical physical methods including Chapelle test, set...

Class F Fly ash-based geopolymers are prone to various high-temperature phenomena, such as cracking, spalling, and thermal shrinkage. Here we study the effect of enriching fly ash with synthetic sodalite phase in order enhance properties formed geopolymer. The morphological changes, compositional alterations porosity, gel behaviour, on deformation material after exposure up 1000 °C investigated...

MFI type zeolite membranes were synthesized on two types of supporting materials, alumina (α-alumina) and yttria-stabilized zirconia (YSZ) coated alumina. Membranes were prepared by template-free secondary growth method with multiple growth steps in order to minimize intercrystalline gaps. Gas permeation characteristics, thermal and hydrothermal stability for MFI type zeolite membranes were exa...

In this study, zeolite was employed for the separation and recovery of P from synthetic wastewater and its use as phosphorus (P) source for the cultivation of the green microalga Chlorella vulgaris and the cyanobacterium Arthrospira (Spirulina) platensis. At P-loaded zeolite concentration of 0.15-1 g/L, in which P was limited, the two species displayed quite different behavior regarding their g...

We present a systematic study to investigate the effects of nonframework cations and the role of phonon scattering mechanisms on the thermal transport properties of zeolite LTA, via experiment and semiempirical lattice dynamics calculations. Our study is motivated by the increasing interest in accurate measurements and mechanistic understanding of the thermal transport properties of zeolite mat...

X-ray powder methods have been used to study the room-temperature structures of the synthetic sodalites: Li8(AI6Si6024)CI2, KT.6Nao.4(A16Si6Oz4)CI2, and Nas(A16Si6024)I ~. Natural sodalite was also studied and the atomic coordinates show satisfactory agreement with those determined from the single-crystal data of L6ns and Schulz (1967). The LiC1and KCIas well as the NaCl-sodalites refined in th...

A genetic algorithm has been used to generate crystal framework structures, including that of sodalite and chabazite, from the knowledge of only the unit cell dimensions, constituent elements and by defining exclusion zones–regions within the unit cell where the constituent elements are forbidden, as opposed to being discouraged. We present details of a direct approach to restricting the possib...