The adsorptions of polyethylene glycol monomethyl ether (PEGMME) and dimethyl (PEGDME) on CaA, NaX, NaY, ZSM-5 zeolites have been analyzed by using experimental FT-IR Raman spectroscopies. vibration wavenumbers polymers adsorbed reported the adsorption properties with different molecular sizes cations compared. Disappearing some modes or shifts to higher lower frequency region after zeolites; i...

In fiber concretes, microcracks in the boundary area between the cement paste and the surface of aggregates or fibers are higher. Natural and artificial pozzolans can be used for reinforcing this area. In this research, the combination of glass fiber, zeolite, and nano silica particles were used in lightweight self-compacting concrete containing scoria. Fiber volume fractions between 0% to 1.5%...

h-zsm-5 nano-zeolites were synthesized by hydrothermal method using tetrapropylammonium hydroxide (tpaoh) as a template in the presence of various tpabr concentrations. the effect of different tpabr/tpaoh molar ratios was studied on the catalytic performance of dehydration of methanol to dimethyl ether (dme) in a fixed bed reactor under the same operating conditions (t=300°c, p=1 atm, and whsv=...

Fibrous erionite is a mineral fibre of great concern but to date mechanisms by which it induces cyto- and geno-toxic damage, and especially the role of iron associated to this zeolite species, remain poorly understood. One of the reasons is that we still don't know exactly where iron is in natural erionite. This work is focused on fibrous erionite-Na from Jersey (Nevada, USA) and attempts to dr...

2,6-Dimethylnaphthalene (DMN) is the key intermediate in the synthesis of poly(ethylene naphthalate) (PEN), a high-performance polymer. The detailed reaction mechanism of the catalyzed 1,5to 2,6DMN isomerization via 1,6-DMN by acidic beta zeolite is investigated at the ONIOM(M06-L/6-31G(d,p):UFF) level of theory. The M06-L method, a newly developed density functional theory, is applied for the ...

Alkaline protease from brinjal leaf (Solanum melongena) having milk clotting activity has been purified to 9.44 fold to a final specific activity of 45.71 U/mg. SDS-PAGE of the final preparation revealed a single protein band of approx 14 kDa. Purified enzyme was characterized and was successfully immobilized into the amorphous mesoporous silica (SBA-15) and crystalline mesoporous zeolite (Nano...