Macroporous Niobium Phosphate-Supported Magnesia Catalysts for Isomerization of Glucose-to-Fructose

Abstract

The catalytic performance of hierarchically porous niobium phosphate (NbP) supported magnesia for the glucose isomerization to fructose, was investigated under atmospheric air atmosphere. Porous NbP showed improved support effects on MgO in comparison to other metal oxides tested for glucose isomerization. Also, the amount and distribution of basic sites were largely changed by supporting magnesia on NbP. Although the textural properties were reduced and solid acids formed on the MgO/NbP catalysts, glucose isomerization was promoted by increasing magnesium content. The maximum yield of fructose reached ∼24.6% over 40%MgO/NbP-500 with selectivity of 65.7% for 1.0 wt % glucose at 120 °C. The fructose productivity peaked as high as 13.6 g gcatalyst –1 h–1 over 40%MgO/NbP-700 catalyst. The leaching of cations and anions resulted in a homogeneous system for glucose isomerization. Regeneration almost fully reactivated the catalyst to its initial activity. The MgO/NbP showed high stability under air atmosphere for 15 days, and high potential use for glucose isomerization.

Tuning Brønsted and Lewis acidity on phosphated titanium dioxides for efficient conversion of glucose to 5-hydroxymethylfurfural

“…[4][5][6] Due to the high cost of fructose, it is more desirable to synthesize HMF from highly available resources such as glucose, the most common monosaccharide unit found in cellulose. [7][8][9] However, this process requires a catalytic system capable of performing (i) glucose isomerization to fructose catalyzed by a Lewis acid and (ii) fructose dehydration to HMF which is favored under Brønsted acid conditions. [10][11][12] Consequently, the use of bifunctional solid catalysts, consisting of both Lewis and Brønsted acid sites, is an efficient approach to promote glucose conversion to HMF.…”

Catalytic Production of Oxygenated and Hydrocarbon Chemicals From Cellulose Hydrogenolysis in Aqueous Phase

“…Generally, fructose is derived from the isomerization of glucose obtained after the hydrolysis of cellulose in the presence of enzymes, homogeneous acids, bases, or Lewis acidic sites, which plays a key role in the way of producing platform chemicals and fuels (Lee and Hong, 2000;Tanase et al, 2001;Moliner et al, 2010;Liu C. et al, 2014). Recently, the catalytic performance of macroporous niobium phosphate (NbP) supported by MgO catalysts for isomerization of glucose to fructose was investigated and shows high efficiency in water and air atmosphere (Gao D. et al, 2019). The TON (defined as the number of moles of fructose formed per mole of basic sites on the fresh catalyst when the yield of fructose reached maximum value) values increased with the increase of MgO content from 20 to 60 wt%.…”

Preparation of hierarchically porous spinel CoMn2O4 monoliths via sol–gel process accompanied by phase separation

“…Meanwhile, the nanopores typically smaller than 100 nm are formed as interstices of structural units in the macropore skeletons. Such HPMs can be applied to the fields of high-performance liquid chromatography (HPLC), 16,17 adsorption, 7,18 and catalyst/catalyst supporter, [19][20][21] where they show their advantages in terms of easy handling and transport efficiency in contrast to the powder materials and the materials with no pores or only unimodal pores.…”