Sol Binder Research Articles

Effects of different silica sol binders on properties of natural zeolite/silica sol deposits prepared by electrophoretic deposition

Effects of different silica sol binders on properties of natural zeolite/silica sol deposits prepared by electrophoretic deposition

Unmolded refractories with a silica sol binder

Results are provided for a study of unmolded refractories based on silica sol binder, and comparison of them with unmolded refractories with a binder based on high-alumina cement. It is shown that with respect to strength and thermal shock resistance unmolded refractories with a silica sol binder surpass those with a cement binder. Refractories with a silica sol binder make it possible to use them for drying up to 110°C, and this reduces considerably the preparation time to use for a molded refractory.

S0405-1-3 電気泳動堆積により作製したゼオライト厚膜のシリカゾル結合剤を用いた耐久性向上(セラミックス/セラミックス基礎合材料I)

S0405-1-3 電気泳動堆積により作製したゼオライト厚膜のシリカゾル結合剤を用いた耐久性向上(セラミックス/セラミックス基礎合材料I)

Preparation and Structure Characterization of Mullite Fiber Porous Ceramic

Mullite fiber porous ceramic was prepared by forced liquid displacement forming and using Mullite precursor sols as binders. SEM studies have shown that the uniformity of integral ceramic is good although the binder and fiber congregate slightly. Mullite precursor sols spread to films or congregate together in miniature. The mullite sol binders between fibers limit to the contact points and the redundant binders form flat film even if they are superfluous, and the pores were not built up even where the binders congregate badly. The results from mercury porosimetry testing of the mullite fiber porous ceramic showed the relationship of cumulative intrusion and diameter for mullite fiber porous ceramic using colloidal mullite binder, and the mean pore size is 45.6μm. The pore size distribution is very broad, from about 0.2 to 174.9μm.

Particle design and evaluation of dry [formula omitted] recovery sorbent with a liquid holding capability

For CO 2 capture at high-temperature/high CO 2 partial pressure conditions a new dry CO 2 removal sorbent was developed based on lithium silicate with additives to accelerate CO 2 sorption. To avoid adhesion and defluidization associated with the formation of the liquid carbonate phase in the temperature range of 500 – 600 ∘ C , the sorbent particles were designed whereby the granulated lithium silicate core was coated with a layer of coarse alumina particles. This prevents the liquid lithium carbonate from wetting the sorbent surface. Several different types of sorbents were manufactured by granulation and coating with different ceramic sol binders and different prescriptions in a tumbling fluidized bed. Minimum fluidization velocity, fluidizing behavior and adsorption/desorption properties of the sorbent particles were determined in a laboratory scale fluidized bed reactor (i.d., 0.03 m) in the temperature range up to 1073 K. During a repeated cyclic adsorption/desorption, a gradual decrease in both the overall conversion and maximum adsorption capacity took place. Nevertheless, the performance obtained for the sorbent manufactured with alumina sol was found to be the most successful one characterized by no defluidization and a high adsorption capacity of 50% in conversion (10 wt% including the coat layer) over 60 cycles.

Pore Structure of Specimens Prepared from Graphite-Containing Refractory Mixtures

The effect of technological factors (composition, temperature, and holding time) on pore structure, gas permeability, and specific surface of specimens molded from graphite-containing refractory mixtures is studied. Dense refractories based on crucible and muffle mixtures can be prepared at 1100 – 1400°C using a silica sol binder. Heat treatment of the refractories at higher temperatures (about 1600°C) is not recommended because of the sharp increase in open pore size, which may lead to degradation of performance characteristics.

The Influence of Alumina on the Performance of FCC Catalysts during Hydrotreated VGO Catalytic Cracking

Two categories of FCC catalysts were prepared. The first one is an FCC catalyst containing Y−zeolite and amorphous matrix. The second category is amorphous catalyst without Y−zeolite. Alumina was systematically added to both catalyst categories. The addition of alumina to the FCC catalyst containing Y−zeolite forms an active matrix. The inactive matrix of the catalyst is composed of kaolin filler and silica sol binder. The experimental data clearly show that alumina addition to both catalyst categories substantially increased both catalyst surface area and acidity. The addition of alumina to the amorphous catalyst resulted in a significant increase in hydrotreated VGO conversion. However, similar alumina addition to Y−zeolite containing catalysts did not appear to have a significant effect on the hydrotreated VGO conversion.

The influence of Y-zeolite unit cell size on the performance of FCC catalysts during gas oil catalytic cracking

FCC catalysts were prepared from Y-zeolite with different unit cell size (UCS). The matrix of the catalysts composed of kaolin filler and silica sol binder. The experimental data clearly show that UCS controls the product distribution of VGO cracking with Y-zeolite catalysts. Coke model was presented to predict coke formation as a function of VGO conversion and catalyst UCS. Gasoline yield was slightly higher at low UCS range (lower than 24.36 Å) while, coke, LPG, and dry gas yields were higher at high UCS range (higher than 24.36 Å). The effect of UCS on hydrogen transfer and isomerization reactions was also investigated.

Inorganic binders for graphite-containing crucibles

Some technological features of obtaining acid silica sol from slags of ferroalloy production are considered. A new binder (Vanal analog) was synthesized on the basis of the V2O3−Al2O3−TiO2−SiO2−Na2O system. Advantages of using slag binders in the fabrication of graphite-containing crucibles are demonstrated. Articles using these binders exhibit lower open porosity, gas permeability, specific volume, and permeable-pore size. The thermal stability of crucibles for casting black silumin, fabricated using the silica sol binder, was 3.8 times that of crucibles with the usual binder.

Aluminosilicate fibre mats fired with alumina/silica sol binders containing 1% and 2% K 2O

Aluminosilicate fibre mats fired with alumina/silica sol binders containing 1% and 2% K 2O