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/m 2 UV light Acid 0.01 N HCl 14 d Neutral H 2 O 40 °C
Green chemistry approach for the synthesis of PbSnO3
An effective photocatalyst for the degradation of dyes under sunlight
.11.010 . 16. Alaton , LA , Ferry , JL . Near-UV–VIS light induced acid orange 7 bleaching in the presence of SiW 12 O 40 4− catalyst . J Photochem Photobiol A . 2002 ; 152 : 175 – 181 . 10.1016/S1010
. Heydari , A , Shiroodi , RK , Hamadi , H , Esfandyari , M , Pourayoubi , M . N - tert -butoxycarbonylation of amines using H 3 PW 12 O 40 as an efficient heterogeneous and recyclable catalyst . Tetrahedron Lett 2007 48 : 5865 – 5868 10.1016/j
X-ray diffraction was performed using a Rigaku Geigerflex diffractometer, with monochromated Cu K α radiation ( λ = 1.5418 Å) over the 2 θ range 4º–40º with 0.1º resolution. Thermal analysis was carried out by thermogravimetry and
alcohols with hydrogen peroxide, such as Na 12 [WZnZn 2 (H 2 O) 2 (ZnW 9 O 34 ) 2 ] [ 13 , 14 ], Na 6 [SiW 11 ZnH 2 O 40 ]·12H 2 O [ 15 ], K 8 [BW 11 O 39 H]·13H 2 O [ 16 ] and K 8 [γ-SiW 10 O 36 ]·13H 2 O [ 17 ]. The catalysts could be reused without
solution of (NH 4 ) 6 H 2 W 12 O 40 (Strem chemicals) or La(NO 3 ) 3 ·6H 2 O (Wako pure chemical industries) and dried at 100 °C, followed by calcination for 5 h at 600 °C. In the tungsten modification, W/Al 2 ratios were 1.0, 2.0, and 3.0 mol/mol, these
Empirical formula Co 5 Na 8 P 10 O 40 H 42 S Molecular mass/g 3006
Wang SG Qu LY ( 2002 ) The solid-state synthesis of polyaniline/H 4 SiW 12 O 40 materials . Synth Met 129 : 187 – 192 http://dx.doi.org/10.1016/S0379
( C c ) 0.89 Unified Soil Classification System (USCS) Poorly-graded sand (SP) ASTM D422 and ASTM D2487 Permeability coefficient, k (cm sec −1 ) 5.5∙10 −3 ASTM D2434 Dry friction angle, Ø (°) 40° Direct shear test ASTM 3080 Saturated friction angle
, difficulty of regeneration of solid heteropoly acid catalysts (decoking) [ 34 ]. The temperature at which H 3 PW 12 O 40 starts loss of all acidic protons is 465 °C and complete decomposition to the constituent oxides occurs at 610 °C. Catalyst regeneration
