Presentation is loading. Please wait.

Presentation is loading. Please wait.

Maretva Baricot Mendoza Supervisor Dr. Josep Font Capafons Chemical Reaction Engineering and Process Intensification Group, Department of Chemical Engineering,

Similar presentations


Presentation on theme: "Maretva Baricot Mendoza Supervisor Dr. Josep Font Capafons Chemical Reaction Engineering and Process Intensification Group, Department of Chemical Engineering,"— Presentation transcript:

1 Maretva Baricot Mendoza Supervisor Dr. Josep Font Capafons Chemical Reaction Engineering and Process Intensification Group, Department of Chemical Engineering, Universitat Rovira i Virgili Tarragona, February 3 rd 2005 Experimental design for the functionalization of activated carbon as catalyst in Catalytic wet air oxidation of phenol

2 Content 1.Introduction 2.State of the art 3.Objectives 4.Methodology 5.Expected Results 6.Future work 2/13

3 Introduction Environmental problem Adsorption Membranes Filtration Ultrafiltration Reverse osmosis Chemical Oxidation Biological Treatments 3/13

4 Introduction Activated Carbon Adsorption, catalyst support but lately….. As catalyst itself!!! What is it ? Growing interest!!! 4/13 Carbonaceous materials, highly crystalline form Extensively developed internal pore structure

5 State of the Art Characterization of carbon surface Chemical titrations Temperature programmed desorptions Infrared and X-ray photoelectron spectroscopy Most common functional groups Phenolics Carbonyls Carboxyls Quinones Lactones Anhydrides 5/13

6 State of the Art Carboxylic acid Lactone Phenol Carbonyl Anhydride Ether Quinone 6/13 Functional groups

7 State of the Art Baçaoui et al Environ. Sci. & Technol, (17): p Herbicides Pereira et al Appl. Catal., A, (1): p Activated carbon as catalyst in the oxidative dehydrogenation of ethylbenzene Modified AC 7/13

8 State of the Art CREPI Phenol oxidation in a Trickle bed reactor 160ºC and Oxygen partial pressure 0,82 MPa (1) Conversion up to 99 % Commercial activated carbon as Catalyst 8/13 (1) J. Chem. Technol. Biotechnol., (7): p

9 Objectives Design an experimental procedure to functionalize activated carbon in order to obtain a good surface chemistry that improves the catalytic activity of carbon in the TBR. Main Secondary Superficial functional groups Carbon texture Defunctionalization-Refunctionalization process 9/13

10 Methodology Defunctionalization Heat treatment under Inert atmosphere Elimination of surface functional groups Temperatures ranges Refunctionalization Heat treatment under Oxygen and Nitrogen atmosphere Formation of specific surface functional groups Varying T, P O 2 and time Carbon treatment 10/13

11 Methodology From Refunctionalization Stage MAC tests Adsorption tests Catalytic activity tests Batch configuration TBR, Milder conditions Set of Modified Activated Carbon MAC 11/13

12 Methodology From the set of MAC those that shows better performance as catalyst and adsorptive material… MAC characterization Chemical titrations TGA + TPD Infrared Spectroscopy Thermogravimetric analysis + Thermal programmed desorptions 12/13

13 Expected Results 1.Clarification of the influence of the surface chemistry on the AC catalytic performance 2.Determination of better surface chemistry on activated carbon for it to show catalytic activity 3.Obtaining a better catalyst for phenol oxidation than commercial AC 4.Procedure to design tailor made AC active for CWAO, from any source 13/13

14 Future work 1.Develop an experimental procedure combining oxidizing treatments and characterization techniques to obtain catalyst useful in oxidation of several compounds as halogenated phenols 2.Improve adsorptive performance of AC with chemical surface modification 3.Establish experimental procedures to specifically functionalize AC surface in order to improve its behavior as catalyst, support or adsorptive material 14/13

15 Questions Thanks for your attention!!! Questions ????


Download ppt "Maretva Baricot Mendoza Supervisor Dr. Josep Font Capafons Chemical Reaction Engineering and Process Intensification Group, Department of Chemical Engineering,"

Similar presentations


Ads by Google