CWAO of phenol using CeO2/gamma-Al2O3 with promoter--effectiveness of promoter addition and catalyst regeneration.

The effect of promoter addition on activity of CeO(2)/gamma-Al(2)O(3) was assessed via the CWAO of phenol. Adding Cu as the promoter rendered the most effective performance, followed by Mn, although the performance of Mn-promoted catalyst was inferior to CeO(2)/gamma-Al(2)O(3). Mineralization of phenol was effectively implemented at 160 degrees C using Cu-promoted catalyst (Ce15Cu5).

Performance of the supported copper oxide catalysts for the catalytic incineration of aromatic hydrocarbons.

A fixed bed reactor was used to assess the catalytic incineration of toluene by various transition-metal oxide species supported on gamma-Al(2)O(3). CuO/gamma-Al(2)O(3) was found to be the most active of seven catalysts investigated. The CuO species, with a Cu content of 5% (wt), was hence used with four different supports (CeO(2), gamma-Al(2)O(3), TiO(2) and V(2)O(5)) in order to define the optimal combination.

An assessment of the suitable operating conditions for the CeO2/gamma-Al2O3 catalyzed wet air oxidation of phenol.

It has been shown that the CeO2/gamma-Al2O3 catalyst is a feasible alternative to CeO2 for the catalytic wet air oxidation (CWAO) of phenol because it remains an effective catalyst and yet is cheaper to prepare. In this study, we found that the optimal cerium content in the CeO2/gamma-Al2O3 catalyst was 20 wt.%, regardless of catalyst loading.

Catalytic wet air oxidation of phenol using CeO2 as the catalyst. Kinetic study and mechanism development.

Using a CeO2 catalyst prepared from CeCl3.7H2O under high thermal impact, the catalytic wet air oxidation (CWAO) of phenol was effectively implemented. With initial phenol concentrations of between (400 and 2500) mg/L, and at a temperature of 160 degrees C, the rate of phenol conversion increased with increased catalyst loading (0.

Study on catalytic incineration of methane using Cr2O3/gamma-Al2O3 as the catalyst.

A fixed bed reactor was employed to investigate the catalytic incineration of CH4 by various supported transition metal oxide catalysts, with a view of finding the optimal one. Results indicated that the active species, the support, the metal content, the weight hourly space velocity (WHSV), and the inlet CH4 concentration were all important factors affecting CH4 oxidation. Cr2O3/gamma-Al2O3 was found to be the most active catalyst among the seven gamma-Al2O3-supported metal oxide catalysts tested.

Wet air oxidation of a reactive dye solution using CoAlPO(4)-5 and CeO(2) catalysts.

Wet air oxidation of a prepared reactive dye solution was performed to assess the efficacy of CoAlPO(4)-5 and CeO(2) as catalysts in the reaction. Via adsorption and oxidation of dye, CoAlPO(4)-5 effectively decreased American Dye Manufacturers Institute and chemical oxygen demand (COD) values in the dye solution. At a reaction temperature of 135 degrees C and an applied pressure of 1.

Catalytic wet air oxidation of phenol by CeO2 catalyst--effect of reaction conditions.

The effect of catalyst loading, oxygen pressure, reaction temperature and phenol concentration on phenol conversion and total organic carbon (TOC) conversion, using CeO(2) as the catalyst, was investigated. There appeared a maximum rate of phenol conversion and TOC conversion as the catalyst loading increased. With phenol concentrations in the range of 400-2500 mg/L and oxygen pressure of 0.

Effect of oxygenates on exhaust emissions from two-stroke motorcycles.

The advantages of adding oxygenates to gasoline include their raising of the octane rating and their ability to reduce toxic compounds in the gasoline. A study of impacts of various oxygenates used in 50cc two-stroke motorcycle fuel was conducted, using the two most popular motorcycles in Taiwan, to determine the effect of oxygenates on exhaust emissions. Oxygenates used in the study were methanol, ethanol, benzene, methyl tert-butyl ether (MTBE) and isopropyl ether (IPE).

The kinetics of catalytic incineration of (CH3)2S2 over the CuO-MoO3/gamma-Al2O3 catalyst.

In this study, by varying reaction conditions including particle size, space velocity, reactant concentration and reaction temperature, the kinetics of catalytic incineration of (CH3)2S2 catalyzed by the CuO-MoO3/gamma-Al2O3 catalyst was investigated. Three kinetic models, i.e.

The promoter effect and a rate expression of the catalytic incineration of (CH3)2S2 over an improved CuO-MoO3/gamma-Al2O3 catalyst.

The CuO-MoO3/gamma-Al2O3 catalyst, confirmed previously as having good activity in the catalytic incineration of (CH3)2S2, was employed as the principal catalyst in this study. With the aim of improving catalyst activity and resistance to deactivation by sulfur compounds, a promoter was added either before adding the precursors of Cu and Mo or together with Cu and Mo onto the gamma-Al2O3. Promoters included transition metals and elements from groups IA-VIIA in the chemical periodic table.

Catalytic wet air oxidation of phenol by various CeO2 catalysts.

Investigations of various CeO2 catalysts using XRD, 02-TPD, H2-TPR and catalytic wet air oxidation of phenol showed that CeO2 calcined under higher thermal impact (designated as type A) displayed excellent catalytic ability for the redox reaction of organics. Results of the investigations mentioned above showed that type A CeO2 has a less stable structure, more structure oxygen exchangeable and more oxidizing ability for the consumption of H2 and conversion of phenol. At phenol concentrations between 400 and 2,500 mg/L, oxygen pressure in the range of 0.

Effect of catalyst preparation conditions on the hydrodesulfurization of thiophene over Co-Mo/gamma-Al2O3.

The purpose of this research was to study the effects of preparation conditions on the catalytic properties of the Co-Mo/gamma-Al2O3 catalyst. The work included catalyst preparations and reactions. In the preparations, cobalt-impregnated Mo/gamma-Al2O3 (designated as IcIM) was found to have a promoting effect on the hydrodesulfurization (HDS) of thiophene.

EFFECT OF CATALYST PREPARATION CONDITIONS ON THE HYDRODESULFURIZATION OF THIOPHENE OVER Co-Mo/γ-AlO.

The purpose of this research was to study the effects of preparation conditions on the catalytic properties of the Co-Mo/γ-AlO catalyst. The work included catalyst preparations and reactions. In the preparations, cobalt-impregnated Mo/γ-AlO (designated as IcIM) was found to have a promoting effect on the hydrodesulfurization (HDS) of thiophene.