Alumina effect

Granger, P., Delannoy, L., Lecomte, J.J. et al. (2002) Kinetics of the CO + NO Reaction over Bimetallic Platinum-Rhodium on Alumina Effect of Ceria Incorporation into Noble Metals, J. Catal., 207, 202. 

To show the alumina effect quantitatively, a series of catalysts was made in which the amount of alumina in the matrix was varied from 25 to 100% by adding alumina sol to a 25% alumina, silica-alumina slurry. These catalysts were formulated with REY molecular sieve. The results for SO2 removal are shown in Figure 3 where SO2 removal (corrected for unit factor) increases with increasing alumina. Our conclusion that alumina was important for SO2 adsorption also confirmed the results of Blanton and Flanders at Chevron (22). The non-linearity of the relationship implies an antagonistic effect between silica and alumina. The silica-alumina antagonism will be discussed relative to deactivation subsequently. 

Hydrolysis of esters,1 KOH crushed with neutral alumina effects hydrolysis of even hindered esters at room temperature (4-48 hours). 

Espinoza, R. L., Snel, R., Korf, C. J. and Nicolaides, C. P. Catalytic oligomerization of ethene over nickel-exchanged amorphous silica-aluminas effect of the acid strength of the support. Appl. Catal., 1987, 29, 295-303. 

Hayes, K.E et al.. Application of surface complexation models for radionuclide adsorption Sensitivity analysis of model input parameters, NUREG/CR-5547, US Nuclear Regulatory Commission, Washington DC, 1990, cited after Prikryl, J.D. et al.. Uranium sorption on a alumina Effects of pH and surface area/solution volume ratio, Radiochim. Acta, 66/67, 291, 1994. 

Asbase. KF on alumina effects the formation of trichloroacetimino ethers, and those derived from allylic alcohols readily undergo rearrangement to afford N-allyl trichloroacetamides. Xanthates are similarly prepared." ... 

Marecot, P. et al. Propane and propene oxidation over platinum and palladium on alumina Effects of chloride and water. Applied Catalysis B Environmental 3, 283-294 (1994). 

Briot, P. and M. Primet (1991). Catalytic oxidation of methane over palladimn supported on alumina. Effect of aging under reactants. Appfierf Catalysis 68(1) 301-314. Buchko, C. J., L. C. Chen, Y. Shen, and D. C. Martin (1999). Processing and micro-structural characterization of porous biocompatible protein polymer thin films. Polymer 40(26) 7397-7407. 

Rao and Sircar [5-7] introduced nanoporous supported carbon membranes which were prepared by pyrolysis of PVDC layer coated on a macroporous graphite disk support. The diameter of the macropores of the dried polymer film was reduced to the order of nanometer as a result of a heat treatment at 1,000°C for 3 h. These membranes with mesopores could be used to separate hydrogen-hydrocarbon mixtures by the surface diffusion mechanism, in which gas molecules were selectively adsorbed on the pore wall. This transport mechanism is different from the molecular sieving mechanism. Therefore, these membranes were named as selective sitrface flow (SSF ) membranes. It consists of a thin (2-5 pm) layer of nanoporous carbon (effective pore diameter in the range of 5-6 A) supported on a mesoporous inert support such as graphite or alumina (effective pore diameter in the range of 0.3-1.0 pm). The procedures for making the selective surface flow membranes were described in [5, 7]. In particular, the requirements to produce a surface diffusion membrane were shown clearly in [7]. 

Sullivan, R.C., Thomberry, T., Abbatt, J.P.D. Ozone decomposition kinetics on alumina effects of ozone partial pressure, relative humidity and repeated oxidation cycles. Atmos. Chem. Phys. 4, 1301-1310(2004)... 

---