We present detailed studies of potassium doping in PbTe(1-y)Se(y) (y = 0, 0.15, 0.25, 0.75, 0.85, 0.95, and 1). It was found that Se increases the doping concentration of K in PbTe as a result of the balance of electronegativity and also lowers the lattice thermal conductivity because of the increased number of point defects. Tuning the composition and carrier concentration to increase the dens...

Zeolite Y, as a solid acid catalyst with excellent performance, is landmark in petroleum refining and chemical industry production–especially catalytic cracking reactions. Improving the SAR of Y zeolite, enriching its pore structure, modifying it heteroatoms can realize multifunctional catalysis improve application value it, then meet demands refining. In this review, synthesis zeolites high SA...

INTRODUCTION The pros and cons for implementing protocol biopsies (PB) after kidney transplantation are still a matter of debate. We aimed to address the frequency of pathological findings in PB, to analyze their impact on long-term graft survival (GS) and to analyze the risk factors predicting an abnormal histology. METHODS We analyzed 946 kidney PB obtained at a median time of 6.5 (±2.9) mo...

Structural properties of Pb-exchanged zeolites are interest because their applications in environmental remediation and industrial processes. In this study, we report on a stellerite (Pb-STI), with particular focus the cationic species, which form inside zeolitic pores as result exchange experiments. The produced zeolite had chemical composition Pb 13.4 (OH) 10 Al 17.4 Si 54.6 O 144 ∙38H 2 O, i...

In this work, the interactions of methyl tert-butyl ether (MTBE) on different dealuminated high silica zeolites were studied by means of both experimental and computational approaches. Zeolites with different textural and surface features were selected as adsorbents and the effect of their physico-chemical properties (i.e. pore size architecture and type and amount of surface OH sites) on sorpt...

The synthesis of calcium silicate supported zeolite membrane was carried out by second growth method. The chemical nature of the functionalizing agent on the formation of homogenous zeolite membrane was evaluated. One monomer and two cationic polymers were used: 3-aminopropyltriethoxysilane (APS), polyethylenimine (PEI) and polydiallyldimethylammonium chloride (PDDA). The support was subjected ...

"!$# &%' (# ) * !+ !, )# . / ) 0 1) 2! 3 ( 45 ( 16 7 ) 8 9 ) ):<;=# ( > ) (# )?/@ ) 2! A )% . B BC D ! %E ' FB ) G# ( )BH IJ%' (# ) ) 3 BK %L 8K!$ M >B )-$ ) !$ BN F !$%O M%L P# & -$ 9# !$ %' Q !PB!$ > Y -S 6 8$ Y ) )1) Y (1)! )?

Iron-substituted MFI, Y and USY zeolites prepared by two preparation routes-classical ion exchange and the ultrasound modified ion-exchange method-were characterised by micro-Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet (UV)/visible diffuse reflectance spectroscopy (UV/Vis DRS). Ultrasound irradiation, a new technique for the preparation of th...

A series of reactions of the type Y. + XH(4) --> YH + .XH(3) and Y'. + HX(CH(3))(3) --> Y'H + .X(CH(3))(3), where Y = H, CH(3); Y' = CH(3), C(CH(3))(3); and X = Si, Ge, Sn, Pb are studied using state-of-the-art ab initio electronic structure methods. Second-order Møller-Plesset perturbation theory; the coupled-cluster singles, doubles, and perturbative triples method; and density functional the...

On the basis of the v a n der Waals concept of Ascarelli and Paskin the hard sphere theory of self diffusion is extended to binary l iquid alloys. Using only the melt ing temperature of the pure metals and the densities, component self-diffusion coefficients and, w i t h the help of Darken's equation, mutua l diffusion coefficients were calculated. Agreement w i t h experimental results is good...