Study of physisorbed and chemisorbed carbon dioxide (CO2) species was carried out on the NaX zeolite modified by cationic exchanges with bivalent cations (Ca2+ Ba2+) temperature-programmed desorption CO2 (CO2-TPD). Others results were obtained infrared to complete study. The this research showed, in physisorption region (213 - 473 K), that increase slightly interactions molecule adsorbents and/...

Silicon and aluminum sources are most important reactants in the synthesis of zeolite. The use of the silicon source has an important effect on the crystallization of zeolites. Also, it can change the properties of the end product. This work reports the influence of three common commercial silica sources such as colloidal silica (Ludox AM-30), fumed silica and water glass on the crystallinity o...

The task of this research cycle was to measure adsorption isotherms (а) in the temperature range from 273 373 K, based on measured at different temperatures, calculate isosteric heats ( Qd ) and entropies (∆ Sd order select an effective adsorbent for purifying natural gas oil products sulfur-containing compounds. This article presents results studies COS NaX, carried out four temperatures: 273,...

Herein, optimization of zeolite NaA/NaX synthesis conditions in order to obtain the final product with high surface area and pore volume was investigated. An optimal condition 5 days aging time crystallization 9 h co-addition cetyltrimethylammonium bromide (CTAB) heptane. All those provided mixed phase between NaA NaX, addition organic phases improved synthesized zeolite. The role CTAB heptane ...

Many efforts have been made to develop amine-based solid adsorbents for capture of CO2 by adsorption. Compared with the traditional process of absorption in aqueous solutions of amines, the adsorbents with amine immobilized in solids generally result in processes with lower capital and energy costs. The literature contains some experimental studies of CO2 adsorption in impregnated materials; ho...

The adsorption of Co(II) from the simulated solution was investigated using zeolite NaX derived rice husk ash as an alternative adsorbent. behavior depended strongly on equilibrium pH, Co (II) concentration, dosage, and reaction time. high efficiency by obtained under conditions: pH 3.0, 100 mg/L Co(II), 5 g/L NaX, a time 75 min. loading onto well-fitted to Freundlich isotherm capacity around 3...

nickel doped tio2 nano particles (1% w/w) were prepared and immobilized on nax zeolite and after characterization by x-ray diffraction (xrd) and scanning electron microscopy (sem) used as photo catalyts for degradation of orange g. the xrd patterns show that the supported tio2 are crystallized in anatase form and the intensity of the zeolite peaks decreases with the increase of tio2 loading. sc...

The spin-lattice relaxation time T\ of 2 , N a N M R in dehydrated zeolite NaY has been measured from 26 to 300 K. The magnetization recovery curve is not single-exponential at all measured temperatures and 1 increases in proportion to the square of temperature above 200 K. The result is analyzed with a theory of the Raman process based on covalency. The value of T\ is compared with that of NaX...

The decrease in elastic moduli (Young's, bulk, and shear modulus), the variations in their asymmetries, the Poisson's ratio and the linear compressibility due to carbonate formation in NaX, have been compared to those produced by dealumination of the zeolite HY framework, from the Al-Si-Al fragment positioned in joined 4R rings. All these systems have been considered at the density functional t...