Natural Zeolite CAS 1318-02-1

Adsorption homes
Because the pores as well as channels in All-natural Zeolite are filled with water molecules, when the water in the zeolite framework is removed, pores with a huge internal area are formed, which generates a big diffusion force and also can adsorb and also store a lot of molecules. Far more than various other substances, so it can be used as an adsorbent with great performance The quantity of the holes and networks inside the zeolite latticework accounts for more than 50% of the total quantity of the zeolite crystal. They are dealt with in dimension and also regular in shape. The holes are connected to each other through open channels as well as interact with the outdoors. The content of water molecules they fill changes with the outside world. Changes with adjustments in temperature level and also humidity.

Ion exchange efficiency
Ion exchange properties are one more important residential property of zeolites. Cations such as K+, Na +, Ca 2+ as well as water particles in the pores of zeolite are not firmly bound to the framework and also can quickly exchange with cations in the bordering aqueous service. The zeolite latticework structure after exchange is not damaged. The ion exchange of zeolite reveals noticeable selectivity, which is primarily related to the dimension of zeolite pores, the proportion of silicon to aluminum and the nature of cations. Researches have actually shown that the exchange ability of residential clinoptilolite for NH 4 + ions ranges 50-220mmol/ 100g, and the exchange capacity for K + ions is normally 9-26mg/ g, with very few listed below 9mg/g; The total exchange ability of mordenite for NH 4+ ions is usually 50-188.73 mmol/100g, and also the overall exchange ability for K+ ions is typically 1-9 mg/g, with a couple of going beyond 9 mg/g [2] It can be seen that the ammonium ion exchange ability of mordenite as well as clinoptilolite are both high, while the potassium ion exchange ability of clinoptilolite is a lot more than that of mordenite. This is established by the inner architectural characteristics of the zeolite as well as is related to the sizes and shape of the pores. If the proportion of Si/Al is various, the ion exchange performance of zeolites with the exact same silica-alumina framework will certainly be considerably various. For instance, heulandite as well as clinoptilolite have the very same structure, however clinoptilolite has a very good option of Cs and Sr. Exchange ability, can be made use of to remove Cs137 as well as Sr 90 in contaminated wastewater.

Catalytic efficiency.
Natural Zeolite has great catalytic buildings and also is a reliable stimulant as well as stimulant carrier. Many of the reactions it militarizes are carbon ion-type reactions, such as catalytic cracking, hydrocracking, catalytic reforming, isomerization and also alkylation, etc, mostly Utilized in petrochemical industry. The distinctive feature of zeolite catalysis is that it has catalytic activity for lots of responses, just like enzyme catalysis in biochemical responses, yet has a broader range of response temperature levels and pH worths than enzymes.

Thermal security
All-natural zeolites such as clinoptilolite, mordenite, chabazite, erionite, etc have excellent thermal security. The thermal security of zeolite depends on the proportion of silicon to light weight aluminum and also balance cations of the zeolite. Usually, within the range of changes in its structure, the higher the silicon material, the far better the security; modifications in the residential properties of the equilibrium cations have a significant influence on the stability of the zeolite. As an example, natural clinoptilolite, which is abundant in calcium, can break down at 500 ° C. Nevertheless, if the very same sample is ion exchanged with potassium, it will certainly not be damaged when the temperature level gets to 800 ° C. When the mordenite sample is heated to 850 ° C for 12 hrs, the crystal structure is ruined; the thermal security of clinoptilolite is second only to mordenite, as well as the structure is typically destroyed when warmed to 800 ° C for 12 hrs.

Acid resistance
Natural zeolite has good acid resistance. Someone experimentally examined the acid resistance of Zhejiang morden zeolite in my nation. The example was treated with 2mol/L HCl, 4mol/L HCl, 6mol/L HCl and also aqua regia at 90 ° C for 2 hours, and also the crystal lattice was still not destroyed., just when the hydrochloric acid concentration reaches 10mol/L, the crystal lattice starts to be damaged.

Regeneration efficiency
Saturated zeolites utilized in wastewater treatment can recover their adsorption and ion exchange capacities via some ways. Generally made use of regrowth methods consist of: wet method, organic approach, gas stripping method, direct roasting, etc. Ammonia nitrogen can provide a nitrogen resource for microbial growth, which is the theoretical basis for microbial regrowth of zeolite; the gas stripping technique uses high-temperature and also high-pressure steam to eliminate ammonia molecules from zeolite; adsorption is generally an exothermic reaction, as well as raising the temperature level can trigger the exothermic reaction. The response proceeds in the reverse instructions, which is beneficial to the adsorbate leaving the surface area of the zeolite, to ensure that the adsorption ability of the zeolite has a particular recovery. This is the principle of the direct roasting approach.