Mesoporous heteropolyacid nanorods for heterogeneous catalysis in polysaccharide conversion

Abstract

Mesoporous heteropolyacid (HPA) nanorods having a composition of [C16H33N(CH3)3]xH3-xPW12O40 ((CTA)xH3-xPW, x = 1, 2, and 3) were synthesized by surfactant encapsulation and were evaluated for their catalytic activity in cellulose hydrolysis. The (CTA)H2PW nanorods were found to be most active with 57.2% yield of 5-hydroxymethylfurfural (5-HMF) at ~100% conversion in water/methyl isobutyl ketone (MIBK) biphase, which was higher than (CTA)H2PW nanosphere at 140 °C for 11 h. The yields of 5-HMF and glucose were obtained as 4.5% and 54.3% at 160 °C for 8 h in water system, respectively. (CTA)H2PW nanorods showed higher tolerance to such feedstocks as lignocellulose, i.e. corn straw with 19.8% and 8.3% yields for glucose and xylose at 35.4% conversion in water. Moreover, (CTA)H2PW nanorods showed higher stability and long duration with ten times reuse. (CTA)H2PW nanorods presented higher efficiency and reusability in conversion of cellulosic biomass.

H2SO4 assisted hydrothermal conversion of biomass with solid acid catalysis to produce aviation fuel precursors

“… 36 Corn straw (CTA)H 2 PW 150°C, 12 h, Water – c X 8.3, d G 19.8 – Song et al. 37 Cellobiose [HO 3 S-(CH 2 ) 3 -mim]Cl-FeCl 3 180°C, 10 h Water – —, d G 10.9 LA 67.5 Liu et al. 38 Glucose Cation exchange resin 145°C, 24 h Water 100 – LA 70.7 Pyo et al.…”

In situ bifunctional solid acids bearing B–OH and –COOH groups for efficient hydrolysis of cellulose to sugar in a pure aqueous phase

“…9,12 Solid acid catalysts can overcome the drawbacks of traditional liquid acids and have gained increasing attention. [13][14][15][16] A series of heterogeneous solid acids have been developed, including sulfonated solid acids, [17][18][19][20] zeolites, 21 metal oxides, 22 cation-exchange resins, [23][24][25] hetero-poly acids, 26,27 and other materials. 28,29 However, there is an obvious heterogeneous interface between cellulose and solid acids which thus extremely weakens the contact catalysis.…”