summer school, september 18 -24 , 2011 cellulose conversion … · 2011. 12. 1. · m. aresta, a....
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Cellulose conversion into Cellulose conversion into hydroxymethylfurfuralhydroxymethylfurfural (HMF): (HMF):
Catalysis under sustainable conditions in Catalysis under sustainable conditions in aqueous media in absence of polluting aqueous media in absence of polluting
chemicals chemicals
Dr. Carlo PastoreVALBIOR-APULIA, Italy
METEA Research Center andDepartment of Chemistry, University of Bari, Italy
e-mail: [email protected]
Summer School, September 18th-24th, 2011
- Synthesis of mixed oxides tuning the Acid-Base properties- Control of the Strong-Weak basic and acid sites- Study of the Surface Properties (BET)- Study of the Structure-Activity relationship- Definition of the best operative conditions
Our Approach
Summer School, September 18th-24th, 2011 Dr. Carlo Pastore
HOH H
OH
O
OHHOH OH
OOHO
HMF
- 3 H2O
cat,
Fructose
Cellulose
Hemycellulose+
H2O
cat,
O
OHOH
HOHO
HOCH2
Glucose
HOH H
OH
O
OHHOH OH
Fructose
O
OHOH
HOHO
HOCH2
Glucose
OOHO
HMF
- 3 H2O
cat,
Basic Acid
We need a bifunctional catalyst!!!Al3+
Nb5+
Cerium oxides loadedwith different metals
M. Aresta, A. Dibenedetto, C. Pastore… Cat. Today 2008 137 125-131M. Aresta, A. Dibenedetto, C. Pastore… Journal of Catalysis 2010 269 44-52
Summer School, September 18th-24th, 2011 Dr. Carlo Pastore
Glucose into HMF
In each reactor 20 mg ofcatalyst and 2 mL of a 5%wglucose solution have beencharged and heated at 423 Kfor 3 h. At the end of thereaction, the solution has beenfiltered and analyzed usingHPLC equipped with a BioradHPX87H column (60 °C) and aRI detector.
Batch Conditions…
Summer School, September 18th-24th, 2011 Dr. Carlo Pastore
0.4% 1.2% 2.3% 5% By-products3% 6.5% 9.7% 15.8% Yield HMF
The glucose may be converted into HMFin the range of 10-16%w, dependingfrom i) the flow, ii) the startingconcentration of the glucose and iii) thetemperature. In all cases we haveobtained a selectivity higher than 95%:the residence time has a key role.
Continous Flow
Summer School, September 18th-24th, 2011 Dr. Carlo Pastore