Iron oxide dispersion test

Evaluation of the Copolymers The polymer solutions were evaluated for their deposit control and dispersant activities. The tests included calcium phosphate inhibition, calcium carbonate inhibition, iron oxide dispersion, and clay dispersion. The procedures for these tests have been previously reported (12). A commercially available polyacrylic acid was also tested for comparison. The results are shown in Tables II to V. 

Dispersant Activity Tests were conducted utilizing iron oxide and clay suspensions in order to establish the efficacy of the copolymers as dispersants for suspended particulate matter. Kaolin clay was used for the clay dispersion study. According to the procedure, separate 0.1% iron oxides and 0.1% clay suspensions in... 

As shown In Tables IV and V, copolymers were quite effective in dispersing iron oxide and clay as compared to polyacrylic acid. Among the polymers tested, acrylic acid/N-(2-hydroxyethyl)acrylamide seemed to be the most effective. 

There aie indications fmm the relative small line width in both XRD patterns and Messbauer spectra that the imn(ir)sulfatc easily sinters, even at the relative low temperatures of the catalytic reaction. This is also indicated by the catalytic performance test of the catalyst B. Catalyst B containing iron oxide not interacting with the support shows a large deactivation. The time required for stabilization is much longer, and the remaining activity and selectivity is low. The effect of the dispersion, and the interaction with the carrier stresses the great importance of the preparation procedure [4]. 

The wavelength-dispersive x-ray spectroscopy method (ASTM D6376) provides a rapid means of measuring metallic elements in coke and provides a guide for determining conformance to material specifications. A benefit of this method is that the sulfur content can also be used to evaluate potential formation of sulfur oxides, a source of atmospheric pollution. This test method specifically determines sodium, aluminum, silicon, sulfur, calcium, titanium, vanadium, manganese, iron, and nickel. 

Structural sensitivity of the catalytic reactions is one of the most important problems in heterogeneous catalysis [1,2]. It has been rather thoroughly studied for metals, while for oxides, especially for dispersed ones, situation is far less clear due to inherent complexity of studies of their bulk and surface atomic structure. In last years, successful development of such methods as HREM and STM along with the infrared spectroscopy of test molecules has formed a sound bases for elucidating this problem in the case of oxides. In the work presented, the results of the systematic studies of the bulk/surface defect structure of the oxides of copper, iron, cobalt, chromium, manganese as related to structural sensitivity of the reactions of carbon monoxide and hydrocarbons oxidation are considered. 

A novel preparation method was developed for the preparation of iron and gold/iron supported eatalysts using metaUic carbonyl clusters as precursors of highly dispersed nanoparticles over Ti02 and Ce02. A series of catalysts with different metal loadings were prepared and tested in the complete oxidation of methanol and the preferential oxidation of CO in the presence of H2 (PROX) as model reactions. The characterization by BET, XRD, TEM, H2-TPR, ICP-AES and XPS spothghts the interaction between Au and Fe and their influence on the catalytic activity. 

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