Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 8, pp. 1275−1279.
Pleiades Publishing, Ltd., 2013.
Original Russian Text © N.R. Popova, T.V. Tortseva, K.G. Bogolitsyn, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86, No. 8, pp. 1301−1306.
AND POLYMERIC MATERIALS
Catalytic Deligniﬁ cation of Cellulose Fibers
by Hydrogen Peroxide in Presence of Polyoxometalates
N. R. Popova, T. V. Tortseva, and K. G. Bogolitsyn
M. V. Lomonosov North (Arctic) Federal University, Arkhangelsk, Russia
Received May 16, 2013
Abstract—Peroxide deligniﬁ cation of cellulose ﬁ bers in acid medium in presence of polyoxometalates as catalysts
was studied. The effects of the hydrogen peroxide concentration, the catalyst nature, and the addition of the alkali
processing stage on the process of deligniﬁ cation of leafy and coniferous celluloses were investigated.
Processes involving the use of compounds free from
chlorine, molecular oxygen, hydrogen peroxide, and
peroxyacids as deligniﬁ cating reagents are promising
and environmentally safety methods for the cellulose
production . To intensify such processes, compounds
containing variable-valence metals, in particular molyb-
dates, tungstates [2, 3], and also polyoxymetalates, are
used . First investigations of the use of polyoxymeta-
lates as catalysts of the bleaching process were fulﬁ lled
in USA and Portuguese universities [4, 5]. Evtyugin and
coworkers studied the catalytic bleaching of sulfate cel-
lulose prepared from eucalyptus using molecular oxygen
as the oxidizing agent . An examination of the obtained
data has shown that the use of such schemes makes it
possible to produce cellulose with the same parameters
as those for the traditional scheme involving chlorine di-
oxide, the advantage of such schemes consists in the fact
that it makes it possible to decrease considerably chlorine
dioxide consumption and in some cases to exclude this
treatment. All this allowed Technical Center of Paper
(France) to construct a pilot installation for the produc-
tion of bleached kraft-cellulose using polyoxymetalates
as catalysts .
The promising character of such a process was dem-
onstrated in the earlier studies of the oxidation of lignin
compounds (dioxanelignin and market sulfate lignin)
 by dissolved oxygen in acid media in the presence of
polyoxometalates of compounds simulating a lignin struc-
tural unit (vanillin, ferulic acid, and isoeugenol) [7, 8].
The aim of the present work was the study of the
process of deligniﬁ cation of leafy and coniferous cellu-
loses in acid media in the presence of polyoxometalates
As subjects of the study we have chosen market
coniferous cellulose of Solombal pulp-and-paper plant
and leafy cellulose produced in the third production line
of Arkhangelsk pulp-and-paper plant and selected at the
washing-up production area. Characteristics of the initial
celluloses determined by the standard procedures [10–13]
are presented in Table 1. Humidity of the coniferous cel-
lulose was 6.45 ± 0.01 and that of the leafy cellulose
– 6.99 ± 0.34%.
Sodium vanadomolybdophosphate Na
(NRA-5) and manganese-containing sodium vanadomo-
synthesized by the procedure described in the work 
were used as liquid-phase catalysts.
Before running the deligniﬁ cation process, preliminar-
ily weighted cellulose (6 g) was moistened with water by
adding 270 ml of distilled water heated up to the experi-
ment temperature. After that the content of the beaker was
crushed using a homogenizer, and the resulting mixture