Regeneration of H3PW12O40 catalyst in the direct preparation of dichloropropanol (DCP) from glycerol and hydrochloric acid gas

Abstract

Methods for regenerating H 3 PW 12 O 40 catalyst in the solvent-free direct preparation of dichloropropanol (DCP) from glycerol and hydrochloric acid gas were investigated. Regenerated H 3 PW 12 O 40 catalyst was then applied to the solvent-free direct preparation of DCP. In the solvent-free direct preparation of DCP, selectivity for DCP over H 3 PW 12 O 40 catalyst regenerated by method I (recovery of solid H 3 PW 12 O 40 catalyst by evaporating homogeneous liquidphase product solution) significantly decreased with increasing recycling run, while that over H 3 PW 12 O 40 catalyst regenerated by method II (regeneration of H 3 PW 12 O 40 catalyst by oxidative calcination of solid product recovered by method I) was slightly decreased with no significant catalyst deactivation with respect to recycling run. On the other hand, selectivity for DCP over H 3 PW 12 O 40 catalyst regenerated by method III (regeneration of H 3 PW 12 O 40 catalyst by recrystallization and subsequent oxidative calcination of solid product recovered by method II) was the same as that over fresh catalyst without any catalyst deactivation with respect to recycling run. Thus, method III was found to be the most efficient method for the regeneration of H 3 PW 12 O 40 catalyst.

Recent Advances in Catalytic Conversion of Glycerol

“…The H 3 PW 12 O 40 catalysts were able to be regenerated by evaporating the solution after the reaction, followed by oxidative calcination and recrystallization. Such a regenerated H 3 PW 12 O 40 catalyst showed catalytic activity and a selectivity of dichlorohydrin similar to the fresh catalyst (394). It was found that water formed during the reaction had a negative effect on Downloaded by [Princeton University] at 04:47 17 September 2013 the formation of dichloropropanol.…”

Construction of a polyoxometalate-based magnetic composite MOF for the effective adsorption of cationic dyes

“…Compared to Fe 3 O 4 @ZIF-8, the Fe 3 O 4 @ZIF-8@H 3 PW 12 O 40 not only retains the characteristic peak of Fe 3 O 4 @ZIF-8, but also contains the characteristic peak of POM: bands at 891, 980 and 1077 cm −1 can be assigned to W–O–W, WO and P–O in H 3 PW 12 O 40 . 41 However, the characteristic peaks of H 3 PW 12 O 40 show deviation, possibly due to the strong interaction between H 3 PW 12 O 40 and Fe 3 O 4 @ZIF-8, leading to the change of electron cloud density. 42 As can be seen from Fig.…”

Lead zirconium titanate thin films prepared by thermal annealing of multilayer structures composed of PbO, ZrO2 and TiO2

“…Oxygen at 6N was used as an oxidizing gas. The typical growth conditions of PbO, ZrO 2 and TiO 2 thin film are listed in Table 1; MOCVD details are available in the literature [14]. A multilayer structure of binary oxides was prepared as follows: first, an initial oxide layer of either PbO, ZrO 2 or TiO 2 was deposited.…”