Titanium impregnation

Chappelow AV, McMahon JT, Jones CL, Kosmorsky G. Granulomatous orbital inflammation associated with intraorbital titanium-impregnated acetate fiber. Orbit... 

Organic titanates can be used to cross-link sUicones on leather (49). Tetrabutyltitanate and tetrakis( P-aminoethoxy)titanium cross-link sUicones, eg, poly(dimethyl sUoxane), to iacrease both water repeUency and durabUity. For example, good repeUency results from the impregnation of leather with a solution of 10 wt % tetrabutyltitanate ia butyl acetate, foUowed by impregnation with a 9 1 mixture of sUicones and tetrabutyltitanate (50). 

Similar procedures adopted for the synthesis of TS-1 (the mixed alkoxide method, dissolved titanium method, pre-hydrolysis method, wetness impregnation method, and promoter induced synthesis method) were also used for the synthesis of TS-2. Tetrabutylammonium hydroxide (TBAOH) instead of TPAOH was used as the template (6,7,305-308). 

OH ratio on the rate of crystallization and crystallite size investigated Prehydrolysis method. Synthesis using binary mixtures of tetrabutylphosphonium hydroxide and tetraethylphosphonium hydroxide instead of TPAOH as base and template TEOS and TBOT are sources of Si and Ti, respectively. Molar gel composition, SiO2 xTiO2 0.4 ( TEPOH + (1 — jd)TBPOH) 30H2O (x = 0-0.02) temperature = 443 K and synthesis time = 4 days Influence of nature of silicon and titanium alkoxides on the incorporation of Ti Wetness impregnation method... 

Incipient wetness method. For every 1 g of SBA-15, varying amounts of titanium isopropoxide in 10 g of ethanol were used for impregnation. The titanium concentration in the solution varies from 0.05 to 5 M, depending on the desired titanium loading. The impregnated material was dried and calcined at 723 K for 5 h. 0.6-36 (XPS) Pore size = 4.2-5.1 nm, specific surface area = 690-997 m2/g, volume = 0.81-1.17 cm3/g (27)... 

An interesting variation on sulfated metal oxide type catalysts was presented by Sun et al. (198), who impregnated a dealuminated zeolite BEA with titanium and iron salts and subsequently sulfated the material. The samples exhibited a better time-on-stream behavior in the isobutane/1-butene alkylation (the reaction temperature was not given) than H-BEA and a mixture of sulfated zirconia and H-BEA. The product distribution was also better for the sulfated metal oxide-impregnated BEA samples. These results were explained by the higher concentration of strong Brpnsted acid sites of the composite materials than in H-BEA. 

Point of Use Wastewater Treatment Using Agglomerated Nanoparticles of Titanium (IV) oxide and Blotter Paper Impregnated with Silver Nanoparticles in Colum Mode... 

Fig. 13.3 Schematic diagram of two different membrane units, (a) Membrane separator unit composed of two machined blocks of PTFE or Ti (A), and PTFE membrane (B), impregnated with stationary liquid, (b) Membrane unit. The PTFE membrane is placed between the two blocks made of titanium. The two channels (donar and acceptor) that are formed have a nominal volume of 12 pL.

The SCR catalyst designed for FCCU regenerator flue gas service is a homogenous monolith, typically made from 1 mm thick material. Some catalysts are extruded clays that receive a wash coat of titanium dioxide before impregnation of the vanadium and tungsten metals. Another type involves painted plates of expanded metal... 

Ermakova and co-workers manipulated the Ni particle size to achieve large CF yields from methane decomposition. The Ni-based catalysts employed for the process were synthesized by impregnation of nickel oxide with a solution of the precursor of a textural promoter (silica, alumina, titanium dioxide, zirconium oxide and magnesia). The optimum particle size (10 0 nm) was obtained by varying the calcination temperature of NiO. The 90% Ni-10% silica catalyst was found to be the most effective catalyst with a total CF yield of 375 gcp/gcat- XRD studies by the same group on high loaded Ni-silica... 

Figure 12 shows the XANES and FT-EXAFS spectra of the titanium oxide catalysts chemically doped with Cr ions (a and A) and physically implanted with Cr ions (b and B). Analyses of these XANES and FT-EXAFS spectra show that in the titanium oxide catalysts chemically doped with Cr ions by an impregnation or sol-gel method, the ions are present as aggregated Cr oxides having an octahedral coordination similar to CriOs and tetrahedral coordination similar to CrOs, respectively. On the other hand, in the catalysts physically implanted with Cr ions, the ions are present in a highly dispersed and isolated state in octahedral... 

A unique titanium(IV)-silica catalyst prepared by impregnating silica with TiCLt or organotitanium compounds exhibits excellent properties with selectivities comparable to the best homogeneous molybdenum catalysts.285 The new zeolite-like catalyst titanium silicalite (TS-1) featuring isomorphous substitution of Si(IV) with Ti(IV) is a very efficient heterogeneous catalyst for selective oxidations with H2C>2.184,185 It exhibits remarkable activities and selectivities in epoxidation of simple olefins.188,304-306 Propylene, for instance, was epoxidized304 with 97% selectivity at 90% conversion at 40°C. Shape-selective epoxidation of 1- and 2-hexenes was observed with this system that failed to catalyze the transformation of cyclohexene.306 Surface peroxotitanate 13 is suggested to be the active spe-... 

---