Catalytic performance of surface modified-niobic acid

Adid Adep Dwiatmoko,S Ma’Mun,M.R.A Purnomo,H Tamura

doi:10.1051/matecconf/201815401011

Adid Adep Dwiatmoko, S Ma’Mun + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/201815401011

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Abstract

Surface modification of niobic acid with phosphoric acid and its catalytic performance in the hydrolysis reaction has been studied. A series of catalysts, surface-modified with different concentration of phosphoric acid, have been prepared and characterized. It was found that the catalyst selectivity to glucose increased with the increase of acid concentration used for the surface modification. The extent of selectivity enhancement of the modified catalysts showed a good relationship with the atomic ratio of phosphorous and niobium on the surface.

Highlights

Since the first report by Tanabe [1], niobic acid (NA) has been recognized to be an effective catalyst for several reactions involved with participation or liberation of water molecules [2, 3]
We have demonstrated in this work, that the surface modification of the niobic acid catalyst (Nb2O5·xH2O) with phosphoric acid has improved the selectivity in the formation of glucose from cellobiose hydrolysis
Selectivity of glucose increased up to 82.7% with the increase of phosphoric acid concentration used for surface modification up to 1 mol·L-1

Summary

Introduction

Since the first report by Tanabe [1], niobic acid (NA) has been recognized to be an effective catalyst for several reactions involved with participation or liberation of water molecules [2, 3]. We have synthesized phosphoric acidtreated niobic acid catalyst exhibited high activities for hydrolysis of disaccharides to glucose in water, where the conversion and glucose selectivity were 52% and 82%, respectively [7]. Expected products formed from cellobiose would be glucose, fructose, HMF and organic acids (levulinic acid and formic acid). Aside from these products identified, some unidentified products could be produced. From the result that glucose, instead of HMF or organic acids, was favorably produced using the catalyst; an indepth explanation was formulated for unveiling the effect of phosphoric acid treatment on enhancing the selectivity of glucose

Catalyst preparation

Catalyst characterization

Catalytic Reaction

Results and Discussion

Conclusions