Abstract
The isomerization of glucose to fructose and its subsequent dehydration to hydroxymethylfurfural (HMF) have been investigated on nanohybrid catalysts that stabilize emulsions comprising aqueous and organic phases. Significant improvement in catalyst stability was observed when NaX faujasite catalysts were functionalized with multiwalled carbon nanotubes (MWCNT-NaX), with a large fraction of the initial activity and selectivity preserved after several recycles. The combination of MWCNT-NaX, containing Lewis acid sites, and MWCNT-SO3H, containing Brønsted acid sites, enables glucose isomerization and fructose dehydration at high conversion and HMF selectivity. The use of a water/oil biphasic emulsion favors the continuous separation of the HMF product into the organic phase. Furthermore, selective conversion of HMF into added-value products can be accomplished in the same emulsion by incorporating a metallic function on the amphiphilic nanohybrids in the presence of hydrogen. Depending on the metal used, different final products can be obtained. For example, when Ru was added, the main product was 2,5-hexanedione (47.8 mol %), followed by 2,5-bis(hydroxymethyl)furan (15 mol %) and γ-hydroxyvaleric acid (7.8 mol %). When Pd was used, γ-hydroxyvaleric acid (84 mol %) dominated the product distribution, with only small amounts of 2,5-bis(hydroxymethyl)furan (2.9 mol %).
| Original language | English |
|---|---|
| Pages (from-to) | 4761-4771 |
| Number of pages | 11 |
| Journal | ACS catalysis |
| Volume | 5 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 7 Aug 2015 |
| Externally published | Yes |
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Keywords
- carbon nanotubes
- glucose
- water/oil emulsions
- zeolites
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Carbon Nanotube/Zeolite Hybrid Catalysts for Glucose Conversion in Water/Oil Emulsions. / Faria, Jimmy; Pilar Ruiz, M.; Resasco, Daniel E.
In: ACS catalysis, Vol. 5, No. 8, 07.08.2015, p. 4761-4771.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Carbon Nanotube/Zeolite Hybrid Catalysts for Glucose Conversion in Water/Oil Emulsions
AU - Faria, Jimmy
AU - Pilar Ruiz, M.
AU - Resasco, Daniel E.
PY - 2015/8/7
Y1 - 2015/8/7
N2 - The isomerization of glucose to fructose and its subsequent dehydration to hydroxymethylfurfural (HMF) have been investigated on nanohybrid catalysts that stabilize emulsions comprising aqueous and organic phases. Significant improvement in catalyst stability was observed when NaX faujasite catalysts were functionalized with multiwalled carbon nanotubes (MWCNT-NaX), with a large fraction of the initial activity and selectivity preserved after several recycles. The combination of MWCNT-NaX, containing Lewis acid sites, and MWCNT-SO3H, containing Brønsted acid sites, enables glucose isomerization and fructose dehydration at high conversion and HMF selectivity. The use of a water/oil biphasic emulsion favors the continuous separation of the HMF product into the organic phase. Furthermore, selective conversion of HMF into added-value products can be accomplished in the same emulsion by incorporating a metallic function on the amphiphilic nanohybrids in the presence of hydrogen. Depending on the metal used, different final products can be obtained. For example, when Ru was added, the main product was 2,5-hexanedione (47.8 mol %), followed by 2,5-bis(hydroxymethyl)furan (15 mol %) and γ-hydroxyvaleric acid (7.8 mol %). When Pd was used, γ-hydroxyvaleric acid (84 mol %) dominated the product distribution, with only small amounts of 2,5-bis(hydroxymethyl)furan (2.9 mol %).
AB - The isomerization of glucose to fructose and its subsequent dehydration to hydroxymethylfurfural (HMF) have been investigated on nanohybrid catalysts that stabilize emulsions comprising aqueous and organic phases. Significant improvement in catalyst stability was observed when NaX faujasite catalysts were functionalized with multiwalled carbon nanotubes (MWCNT-NaX), with a large fraction of the initial activity and selectivity preserved after several recycles. The combination of MWCNT-NaX, containing Lewis acid sites, and MWCNT-SO3H, containing Brønsted acid sites, enables glucose isomerization and fructose dehydration at high conversion and HMF selectivity. The use of a water/oil biphasic emulsion favors the continuous separation of the HMF product into the organic phase. Furthermore, selective conversion of HMF into added-value products can be accomplished in the same emulsion by incorporating a metallic function on the amphiphilic nanohybrids in the presence of hydrogen. Depending on the metal used, different final products can be obtained. For example, when Ru was added, the main product was 2,5-hexanedione (47.8 mol %), followed by 2,5-bis(hydroxymethyl)furan (15 mol %) and γ-hydroxyvaleric acid (7.8 mol %). When Pd was used, γ-hydroxyvaleric acid (84 mol %) dominated the product distribution, with only small amounts of 2,5-bis(hydroxymethyl)furan (2.9 mol %).
KW - carbon nanotubes
KW - glucose
KW - water/oil emulsions
KW - zeolites
UR - http://www.scopus.com/inward/record.url?scp=84938703015&partnerID=8YFLogxK
U2 - 10.1021/acscatal.5b00559
DO - 10.1021/acscatal.5b00559
M3 - Article
VL - 5
SP - 4761
EP - 4771
JO - ACS catalysis
JF - ACS catalysis
SN - 2155-5435
IS - 8
ER -