Adsorption and diffusion behavior of C4 fractions (n-butane and butene-1) on special shape-selective and acidic ZSM-5 zeolite with different Si/Al ratios, which is used as catalyst in olefins catalytic cracking (OCC) technology, was investigated using an intelligent gravimetric analysis apparatus (IGA-003, HIDEN) at 275, 288 and 300 K.

Study of the effects of Si/Al ratio of HZSM-5 on the direct synthesis of DME;

Determination of Si/Al Ratio of Molecular Sieve by X-Ray Diffraction;

The direct synthesis of dimethyl ether was studied over the bifunctional catalysts of mechanical mixed commercial methanol synthesis catalysts(CuO/ZnO/Al2O3) and dehydration catalysts HZSM-5 with different Si/Al ratio(25,38,50 and 150) in a fixed-bed and high-pressure reactor.

Adsorption capacity for H 2O?H 2S and NH 3 of zeolite modified by decreasing ratio of silicon and aluminum was 16.

ZSM 5 zeolites with high silica alumina ratio were synthesized by using n butylamine as template at temperature range of 160-180℃ for 28-40h with a put in silica alumina ratio range of 100-300.

A comparative investigation on the XRD spectra of coal series kaolin and high-SiO 2/Al 2O 3 kaolin before calcining and acid-leaching and after that, clearly shows that these two kinds of kaolins have the same calcining and acid-leaching mechanisms.

A PERSONAL COMPUTER BASED SOLID STATE NMR SIMULATION SYSTEM FOR Si/Al RATIO DETERMINATION OF Y ZEOLITES;