David T Shepard

US Patent:

20230090959, Mar 23, 2023

Filed:

Jan 14, 2021

Appl. No.:

17/793979

Inventors:

- Ann Arbor MI, US
Mila Bortun - Ypsilanti MI, US
Geng Zhang - Utsunomiya, JP
David Shepard - Canton MI, US

International Classification:

C01G 25/00
B01J 23/10
B01J 23/40
B01D 53/94
H01M 8/1253
H01M 8/126

Abstract:

A cerium-zirconium oxide-based ionic conductor (CZOIC) material including zirconium oxide in an amount ranging from 5 wt. % up to 95 wt. %, cerium oxide in an amount ranging from 95 wt. % to 5 wt. %, and at least one oxide or a rare earth metal in an amount ranging from 30 wt. % or less, based on the overall mass of the CZOIC material. The CZOIC material exhibits a structure comprising one or more expanded unit cells and a plurality of crystallites having ordered nano-domains. The structure of the CZOIC material exhibits a crystal lattice defined by a d-value measured at multiple (hkl) locations using a SAED technique that exhibit distortions, such that the d-values for the same (hkl) location varies from about 2% to about 5% from the d-value measured for a reference cerium-zirconium material at the same (hkl) location.

US Patent:

20210069680, Mar 11, 2021

Filed:

Jan 7, 2019

Appl. No.:

16/959460

Inventors:

- Ann Arbor MI, US
Mila Bortun - Ypsilanti MI, US
David Shepard - South Lyon MI, US
Yunkui Li - Ann Arbor MI, US
Jin Cho - Utsunomiya, JP
Wei Wu - Ann Arbor MI, US
Jeffery Lachapelle - Northville MI, US

International Classification:

B01J 23/83
B01D 53/94
B01J 37/03
B01J 37/06
B01J 37/04
B01J 37/08
F01N 3/10
F01N 3/28

Abstract:

An oxygen storage material (OSM) that exhibits enhanced redox properties, developed mesoporosity, and a resistance to sintering. The oxygen storage material (OSM) has a high oxygen storage capacity (i.e., OSC>1.5 mmol H/g) and enhanced reducibility (i.e., bimodal TPR-Hprofile with two Tin the temperature range from 150 C. to 550 C.). The OSM is suitable for use as a catalyst and a catalyst support. The method of making the oxygen storage material comprises the preparation of a solution containing zirconium, cerium, rare earth and transition metal salts, followed by the co-precipitation of all constituent metal hydroxides with a base.

US Patent:

20210071558, Mar 11, 2021

Filed:

Jan 7, 2019

Appl. No.:

16/959465

Inventors:

- Ann Arbor MI, US
Mila Bortun - Ypsilanti MI, US
David Shepard - South Lyon MI, US
Yunkui Li - Ann Arbor MI, US
Jin Cho - Utsunomiya, JP
Wei Wu - Ann Arbor MI, US
Jeffery Lachapelle - Northville MI, US

International Classification:

F01N 3/10
B01J 23/00
B01J 23/04
B01J 35/10
B01J 35/00
B01J 37/08
B01J 37/03

Abstract:

A method of making an oxygen storage material (OSM) with developed mesoporosity having a small fraction of pores