Layered double hydroxide precursor, their preparation process and catalysts prepared therefrom
AssigneesOxford University Innovation Limited, SCG Chemicals Co., Ltd.
InventorsDermot O'Hare, Shik Chi Tsang, Meng-Jung Li
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Abstract
New layered double hydroxide materials useful as intermediates in the formation of catalysts are described, as well as methods of preparing the layered double hydroxides. Also described are catalysts suitable for catalysing the hydrogenation of CO2 to methanol, as well as methods for preparing the catalysts. The LDH-derived catalysts of the invention are active in the hydrogenation of CO2 to methanol, and show improved activity with respect to Cu/ZnO catalysts derived from copper-zinc hydroxycarbonate precursors.
Claims15
A layered double hydroxide of formula (I) shown below
- [M1-xM′x(OH)2]a+(Xn−)a/n·bH2O·c(solvent) (I)
- wherein
- M represents a mixture of divalent cations comprising Cu2+ and Zn2+;
- M′ represents Ga3+, and optionally one or more other trivalent cations selected from Al3+ and Y3+;
- 0<x≤0.4;
- 0<b≤10;
- 0<c≤10;
- X represents at least one anion;
- n is the charge on anion X and has a value of 1 or 2;
- 0.2≤a≤0.4;
- and
- the solvent represents at least one organic solvent capable of hydrogen-bonding to water;
- wherein a molar ratio of Cu:Zn:Ga within the layered double hydroxide of formula (I) is 1:(0.42-1.00):(0.18-0.65);
- and
- wherein, when the layered double hydroxide is thermally treated at a temperature of 250-400° C. the thermally treated layered double hydroxide is amorphous, optionally containing traces of ZnO phase, and no spinel phase is formed.
Dependencies are inferred from the claim text.