This study describes a new simple, sensitive and selective catalytic kinetic spectrophotometricmethod for the determination of vanadium (V). The method is based upon the catalytic effect ofvanadium (V) on the oxidation of Carminic acid by bromate in sulfuric acid media. The reaction wasfollowed spectrophotometrically by measuring the decrease in absorbance at 490 nm and thedependence of sensiti...

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=...

Determination of metal oxidation state under relevant working conditions is crucial to understand catalytic behaviour. The reduction behaviour of Pt and Re was evaluated simultaneously as a function of support and solvent in a pressurized reactor (autoclave). The bimetallic catalysts are used in selective hydrogenation of carboxylic acids and amides. Gas phase reduction reduced the metals more ...

Hydrocarbon (HC) assisted selective catalytic reduction (SCR) is an appealing technology for NOx reduction in oxygen excess. In particular, a catalyst formulation with silver supported on alumina (Ag/Al2O3) has been measured to have high activity for this reaction [1,2]. Although numerous experimental studies have clarified issues concerning the Ag/Al2O3 catalyst, the nature of the active phase...

Purpose The introduction of flue gas denitrification technologies by selective catalytic reduction (SCR) or non-catalytic (SNCR) in coal fired plants resulted an increase ammonia content fly ash. utilization ash fire and ventilation prevention hard mines causes the release from a ash-water mixture. In applied technology water mixture, gaseous form is discharged mixes with air flowing through mi...

Despite many benefits of agricultural biomass utilization as an energy source, there are certain disadvantages such the possible high emission nitrogen oxides (NOx). NOx represents one key challenges for use a fuel. The experimental denitrification chamber was used to evaluate impact initial NO content, NH3:NO molar ratio, flue gas temperature, and temperature difference between two sections on...

Among the different factors contributing to a good chemical manufacturing process, the process efficiency and specifically volume–time output in terms of reactor capacity and cycle time, respectively, have been given the largest weight – among the conversion costs, with material cost being the second [1]. Raw materials or intermediates with a higher oxidation state than the target products are ...