carbon molecular sieve membranes (cmsms) have been considered as very promising candidates for gas separation, in terms of separation properties as well as thermal and chemical stability. due to the numerous advantages and wide applications of carbon membranes, their application for gas separation is of special importance. because of the importance of carbon membranes and a large number of stud...

The experimentally investigation for dehydration of gas streams in a fixed-bed adsorption column using 4A molecular sieve was reported the first time. Different operating conditions system were performed, such as flow rate (2.0, 5.0 and 8.0 L min.-1) bed depths (10, 20 30 cm). A significantly decreased (p ≤ 0.05) exhaustion time verified result increase rate. On other hand, rupture mass transfe...

For nearly 200 years since their discovery in 1756, geologists considered the zeolite minerals to occur as fairly large crystals in the vugs and cavities of basalts and other traprock formations. Here, they were prized by mineral collectors, but their small abundance and polymineralic nature defied commercial exploitation. As the synthetic zeolite (molecular sieve) business began to take hold i...

incorporation of [fe(bipy)cl4][bipy.h] (1) (where bipy is 2,2′-bipyridine) in the molecular sieves of the type lta, nay and mesoporous al-mcm-41 by using a “ship in a bottle synthesis” approach was investigated. [fe(bipy)cl4][bipy.h] was successfullyincorporated in the channels ofmesoporousal-mcm-41, and the product was characterized by x-ray diffraction, ftir and bet analysis. it was fou...

nay zeolites with different framework si/al ratios were synthesized via hydrothermal technique. structural characteristics of the synthesized zeolites were determined by using xrd, xrf, sem, bet analyses. the effects of operating conditions of hydrothermal dealumination, i.e. time, temperature and partial pressure of water vapor on dealumination of the y zeolites framework and their structure w...

Magnesium chloride hexahydrate and magnesium nitrate were tested for their thermal energy storage in a mixture with carbon materials. The graphite, graphene zeolite-templated replicas used as nucleating agent to supress supercooling. addition of any type into did not lead decrease the supercooling significant enthalpy fusion crystallisation was observed. mixtures after cycling apparently wet, i...

Clinoptilolite is used as an adsorbent to remove heavy metal cations due its function a molecular sieve. This sieve characteristic has made it possible study the efficiency of clinoptilolite and D-Penicillamine in comparative way terms adsorption metals (especially copper) from biological medium. For this purpose, was subjected grinding produce homogenized micronized powder two sizes with d90=7...