ZSM-5 Zeolite , ZSM-5 Molecular Sieve With High Silica To Alumina Ratio

ZSM-5 Zeolite , ZSM 5 Molecular Sieve With High Silica To Alumina Ratio



Specifications



Mole Ratio: 15-1000
Nominal Cation Form: Ammonium/Hydrogen



JIULONG

Products

SiO2/Al2O3M , ole Ratio Nominal Cation Form Na2O Weight % Surface Area,
m2/g
JL 01 25 Sodium/Hydrogen 0.05 340
JL O2 30 Sodium/Hydrogen 0.05 340
JL 03 50 Sodium/Hydrogen 0.05 340
JL 04 80 Sodium/Hydrogen 0.05 340
JL 05 280 Sodium/Hydrogen 0.05 340


















Na2O Weight %: 0.05
Surface Area, m2/g: 340





Description:

ZSM-5 zeolite properties



Thermal stability

High thermal stability of ZSM-5 zeolite. This is caused by a skeleton in a
stable five-membered ring structure and a high silica to alumina ratio. For
example, the sample calcined at 850 ℃ After 2 hours, the crystal structure
unchanged. Even can withstand high temperature of 1100 ℃. So far, ZSM-5
zeolites are known to one of the highest qualitative hot temperature.
Therefore, it is used in high-temperature process is particularly suitable. For
example, use it as a hydrocarbon cracking catalyst, regeneration of the
catalyst can withstand passage of time.



Acid resistance

ZSM-5 zeolite has good acid resistance, it is resistant to various acids except
hydrofluoric acid.



Steam stability

Wang, IKai other studies have shown that when other zeolites by steam and hot
water, and their general structure is destroyed, leading to irreversible
deactivation. The Mobil company with ZSM-5 as the conversion of methanol (water
is one of the major product) catalyst. This suggests that ZSM-5 to water vapor
with good stability. 540 ℃ lower partial pressure of 22mmHg steaming column
and HY zeolite HZSM-5 after 24 hours, a crystallinity of HZSM-5 and about 70
percent of fresh catalyst, but under the same conditions, HY zeolite skeleton
almost completely damage.



Hydrophobic

ZSM-5 having a high silica to alumina ratio, the smaller the surface charge
density. The water molecule is polar, so you will not ZSM-5 is adsorbed.
Although water molecules smaller than the diameter of n-hexane, but the amount
of adsorption of n-hexane ZSM-5 is generally greater than water.



Easy to coke

ZSM-5 V-shaped aperture effective, pore size and bending, preventing a large
condensate formation and accumulation. Meanwhile, ZSM-5 framework is no greater
than the bore of the cavity (cage) exist, so limiting the formation of large
molecules from the secondary condensation reactions. So that the possibility of
ZSM-5 catalyst coke is reduced. ZSM-5 for an alkyl aromatics into the tunnel
barrier is formed, and thus the reaction process it can not continue to react
in smaller pores, the final condensation formed coke. ZSM-5 so much slower than
the rate of coke deposition and Y-type mordenite, difference of almost two
orders of magnitude. Capacity of ZSM-5 zeolite carbon content is higher.



Excellent shape-selective selectivity

Zeolite molecular sieve as catalyst, only smaller than the hole crystal
molecules can catalyze the reaction out of control pore size crystalline
zeolite suffering zeolite catalyst size and shape of reactant and product
molecules showed great selectivity. Pore ​​system of ZSM-5 zeolite having a 10-MR
constituted medium size orifice diameter, it has a good shape-selective
selectivity.

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