Hydrolysis of cellulose by the heteropoly acid H3PW12O40

Abstract

The potential of heteropoly acid H 3 PW 12 O 40 to catalyze the hydrolysis of cellulose to glucose under hydrothermal conditions was explored. This technology could contribute to sustainable societies in the future by using cellulose biomass. A study to optimize the reaction conditions, such as the amount of catalyst, reaction time, temperature, and the amount of cellulose used, was performed. A remarkably high yield of glucose (50.5%) and selectivity higher than 90% at 453 K for 2 h with a mass ratio of cellulose to H 3 PW 12 O 40 of 0.42 were achieved. This was attributed to the high hydrothermal stability and the excellent catalytic properties, such as the strong Brønsted acid sites. This homogeneous catalyst can be recycled for reuse by extraction with diethyl ether. The results illustrate that H 3 PW 12 O 40 is an environmentally benign acid catalyst for the hydrolysis of cellulose.

A Single Bio-based Catalyst for Bio-fuel and Bio-diesel

“…But with the low yield, this is not economical for large scale applications. Inorganic catalysts such as HNMoO 6 [27] and H 3 PW 12 O 40 has been used to catalyze the hydrolysis [26]. But due to the lower cost, non-toxic nature of the catalyst, and renewability, application of the biobased sugar catalyst if successful will be more advantageous.…”

“…Looking at these examples, it appears that high yield of glucose is achievable from breaking cellulose, but the right combination of catalyst, temperature, and solvent has to be found for consistent result at the large scale. II-1.Procedure for deconstruction of cellulose [26]: Cellulose, 0.1 g, catalyst, 0.08 mmole, and distilled water, 5 ml were placed in a steel autoclave lined with Teflon. Autoclave was heated at 180⁰C for 2 hrs while sample was being agitated at 30rpm.…”

Combined Microwave-Acid Pretreatment of the Biomass

“…Another superacid used for the selective conversion of cellulose to glucose is the heteropoly acid H 3 PW 12 O 40 (Tian et al, 2010). The selectivity of the pretreatment method is very high (around 90%) and requires mild reaction conditions (160-180°C).…”

“…The selectivity of the pretreatment method is very high (around 90%) and requires mild reaction conditions (160-180°C). Another advantage of this method is the possibility to reuse the catalyst, which can be recycled by extraction with diethyl ether (Tian et al, 2010).…”

Hydrophobic Lurylamine Modified Heteropoly Acid as an Efficient and Recyclable Catalyst for the Hydrolysis Reaction in Aqueous Solution under Microwave

“…For example, in the hydrolysis of cellulose, H 3 PW 12 O 40 (HPW) exhibited high yield and selectivity of glucose (50.5% and >90% separately) due to its strong Bronsted acid strength and high hydrothermal stability. 11 The effects of Bronsted and Lewis acidity on the activity and selectivity of the HPA-based catalyst for the hydrolysis of cellulose were also discussed in another reports. 12 HPAs together with supported ruthenium catalysts showed not only high activity but also remarkable selectivity to sugar alcohols reaching up to 81% yield of C4 to C6 sugar alcohols in aqueous phase with 7 h at 160 o C. 13 Although the HPAs are unique acid catalysts in the aqueous reaction, the high solubility in polar reaction media largely hinder their practical utilizations.…”