Patent ID: 7247598

Claim:
A nano-scale magnetic solid base catalyst having the formula: M-N—(O)/M′Fe 2 O 4 , Wherein M′Fe 2 O 4 is a nano-scale magnetic core, and M-N—(O) is a composite oxide obtained from calcination of a corresponding layered double hydroxides M-N-LDH, which is coated on the surface of said M′Fe 2 O 4 ; Wherein M is a divalent metal cation selected from the group consisting of Mg 2+ , Ni 2+ , Zn 2+ , Ca 2+ and Co 2+ ; N is a trivalent metal cation selected from the group consisting of Fe 3+ , V 3+ , Al 3+ and Cr 3+ and M′ is a divalent metal cation selected from the group consisting of Mg 2+ , Cu 2+ , Ba 2+ , and Ni 2+ , and said M′ can be the same as said M or different; and wherein M′Fe 2 O 4 comprises about 15 wt. % to about 38 wt. %, and M-N—(O) comprises about 62 wt. % to about 85 wt. %, of the total weight of said nano-scale magnetic solid base catalyst.