Background: Sulfur dioxide gas is known to include pollutants that are harmful to human health and the environment. Therefore, due to the increase of industrial activities, SO2 gas pollution control is very important. Objectives: The purpose of this study was to investigate the efficiency of sulfur dioxide removal by iron oxide nanoparticles deposited on CLINOPTILOLITE zeolite. Methods: Two materials, natural CLINOPTILOLITE and CLINOPTILOLITE containing iron oxide nanoparticles, were used as adsorbents of SO2. Both materials were characterized via scanning electron microscopy imaging, infrared spectroscopy, andN2 porosimetry, along with the determination of the thermodynamic properties and kinetics of SO2 adsorption. Therefore, breakthrough experiments were carried out at different temperatures and with different contact times. Sulfur dioxide adsorption of a real sample was considered for both adsorbents. Results: The adsorption efficiency of SO2 in the synthetic and actual sample was obtained at 80. 3% and 66. 7%, respectively, under optimum conditions (temperature of 25° C and duration of 28. 5 minutes) by modified zeolite with iron oxide nanoparticles. The removal percentage average of SO2 was also obtained in the synthetic and actual sample at 43. 8% and 31. 3%, respectively, by zeolite in optimum conditions (temperature of 25° C and contact time of 20. 5 minutes). The adsorption of SO2 with both adsorbents followed the pseudo-second-order equation and the adsorption process was an exothermic and spontaneous process. Conclusions: The addition of these iron oxide nanoparticles had a positive impact on the surface area and on SO2 capacity.

Background and Objectives: Benzene, toluene and Xylenes (BTX) are organic pollutants, which are mainly associated with oil and its derivatives. BTX is environmental contaminants and considered harmful to human health. Application of surface absorbents such as zeolite is one of several methods for the removal of these compounds. In this study, BTX compounds’ removal efficiencies were investigated and compared by using CLINOPTILOLITE type zeolite and zeolite with copper oxide nanoparticles.Materials and Methods: In this study, the modified zeolite by hydrochloric acid in the grain size 1-2 mm and modified zeolite with nano particle of copper oxide were used. Artificially-Contaminated Air flow was used continuously.To determine BTX concentrations, samplings were done by charcoal tube in current input and output. The concentrations of contaminants were determined by gas chromatography with FID detector.Results: Removal efficiency of benzene, toluene, p-xylene, m-xylene and o-xylene by CLINOPTILOLITE were 78.3%, 62.1%, 32.2% 32.15% and 18.8%, respectively. For the CLINOPTILOLITE containing cooper oxide nano particles efficiency were 25.42%, 35.65%, 36.33%, 33.24% and 29.39%, respectively.Average removal efficiency of BTX compounds observed when the zeolite without nanoparticles used (43.31%) was more than zeolite with nanoparticles (32%). The results showed that the concentration of CO2 in the outlet air of the zeolite-containing nanoparticle (550 ppm) was more than the zeolite without nanoparticle (525 ppm).Conclusion: Results showed that adding nanoparticles to the zeolite, although the removal efficiency of benzene and toluene can be reduced. The results showed that adding nanoparticles to the zeolite, although can be reduced removal efficiency of benzene and toluene, which may be due to occupying or blocking of the pollution absorption sites by the nanoparticles on the zeolite, but It cause promote more catalytic effect of zeolite in the decomposition process of contaminants by breaking the molecules of pollutants and their further degradation progress is done for conversion to carbon dioxide.

The objective of this research is to find an economically attractive alternative method for hydrodesulfurization of petroleum fractions and to select a suitable adsorbent for this process. Deep desulfurization of transportation fuels (gasoline, diesel, and jet fuels) is being mandated by governments and is also needed for future fuel cell applications. However, it is extremely difficult and costly to achieve with current technology, which requires catalytic reactors operated at high pressure and temperature. Zeolites are a family of crystalline aluminosilicate minerals. About fifty natural zeolites are now known and more than one hundred and fifty have been synthesized. CLINOPTILOLITE is a naturally occurring zeolite, formed by the diversification of volcanic ash in lake and marine waters millions of years ago. It is the most researched of all zeolites and is widely regarded as the most useful. It is an abundant natural zeolite. We show that Hg+2 and Ag+ CLINOPTILOLITE can adsorb sulfur compounds from commercial fuels selectively and with high capacities. The desulfurization of 83.60 % by Ag+ CLINOPTILOLITE at liquid to solid ratio of 50/100 gr.ml-1, 353 K, and flow rate of 3.0 ml.min-1 was obtained.

Much of world`s natural gas reserves are impure, one of the principal contaminants being nitrogen which makes it unsuitable for application and, hence, its separation is important. In this research, CLINOPTILOLITE, the most abundant natural zeolite with an open aluminosilicate framework structure and high internal surface area, was modified by ion exchange process to highly exchanged forms of cations of Na+, K+ and H+. The adsorption of N2, CH4 and C2H6 on natural CLINOPTILOLITE (Cp) and on its cation-exchanged forms (Na-Cp, K-Cp and H-Cp) was studied at 25°C. The influence of cation exchange on equilibrium adsorption of N2 showed that selectivity decreased in the order of Cp > Na-Cp > K-Cp and H-Cp has no affinity to nitrogen.