Self-assembled hybrid precursors towards more efficient propane ODH NiMoO₄ catalysts

Abstract

This work shows a novel method to synthesize bulk NiMoO4 from hybrid materials made of guest ions (Ni and Mo precursors) and a polyampholytic comb-like copolymer displaying a supramolecular organization.

A viewpoint on catalytic origin of boron nitride in oxidative dehydrogenation of light alkanes

“…As summarized in Fig. 1(A) for the well-developed metal oxide catalysts, the over-oxidation product, CO2, constitutes a very high proportion of the products, typically around 20% and in some cases even 50%, at conversion levels of ~20%, a typical value of industrial interest [13][14][15][16][17][18][19][20][21][22]. There is therefore an urgent need to develop new catalysts that can produce olefins with high selectivity under the severe conditions of alkane activation, but this is a great challenge.…”

Catalyst development for O2-assisted oxidative dehydrogenation of propane to propylene

“…Thus, the Ni doping and surface hydroxylation (Lewis base addition) could be a reliable strategy for achieving selective O 2 -ODHP. Another example of Ni as a foreign doping element was reported by Farin et al 87 This work fabricated mesoporous b-NiMoO 4 using Ni as the guest ion. Due to the coordination by the copolymer COO À functions, Ni cations were stable in the main b-phase.…”

The Effect of Hydrophobicity on the Synthesis of Homogeneous and Nanostructured NiMo-Based Hybrid Materials

“…By correlating these results, complexation of nickel seems to promote the expansion of the matrix lamellar organization due to the insertion of nickel within the copolymer hydrophilic regions. Besides, the absence of (NH 4 ) 6 Mo 7 O 24 .4H 2 O on the hybrid diffractograms suggests a homogeneous dispersion of Mo ions within the matrix. The over‐sized nature of MoO 4 2− makes their insertion between the copolymer backbones not plausible.…”

“…The over‐sized nature of MoO 4 2− makes their insertion between the copolymer backbones not plausible. These anions are rather believed to establish electrostatic interactions with the positively charged amines in the inter‐sheet space located in between two copolymer layers. The d Bragg increase and the ν as COO− band shift are both maximized and stabilized around an I/R ratio=1 (cfr.…”