3m Innovative Properties Company

Minnesota Mining and Manufacturing Company

US Government As Represented by the Secretary of the Army

USA As Represented by Secretary of the Navy

Larry A Brey

Thomas Edward Wood

Marvin E Jones

Gina M Buccellato

Allen Raymond Siedle

Craig S Chamberlain

Duane Douglas Fansler

Badri Veeraraghavan

Britton G Billingsley

John T Brady

John S Huberty

Gregory William Peterson

Joseph Anthony Rossin

Derek M Maanum

William F Buechter

Donald E Cadwell

Simon J Smith

Thomas I Insley

Philip G Martin

Pierre Legare

John E Trend

Glenn E Weagle

Gezahegan D Damte

Larry A Schumann

A filtration device including a fluid-impermeable housing having a gas inlet and outlet, and containing within the housing first filter media particles of an extended surface area substrate and containing at least one metal impregnant, and second filter media particles of an extended surface area zirconium hydroxide substrate and zinc (hydr)oxide. The device may be used in atmospheres containing various harmful gases, and may provide particularly useful improvements in NObreakthrough times compared to a device containing only the first filter media particles or only the second filter media particles.

Layered or mixed sorbent bed protective filtration device

A filtration device including a fluid-impermeable housing having a gas inlet and outlet, and containing within the housing first filter media particles of an extended surface area substrate and containing at least one metal impregnant, and second filter media particles of an extended surface area zirconium hydroxide substrate. The device may be used in atmospheres containing various harmful gases, and may provide particularly useful improvements in NObreakthrough times compared to a device containing only the first filter media particles or only the second filter media particles.

A filtration device including a fluid-impermeable housing having a gas inlet and outlet, and containing within the housing first filter media particles of an extended surface area substrate and containing at least one metal impregnant, and second filter media particles of an extended surface area zirconium hydroxide substrate and containing zinc (hydr)oxide. The first or second filter media particles also contain an amine-functional material. The device may be used in atmospheres containing various harmful gases, and may provide particularly useful improvements in breakthrough times for nitrogen dioxide, hydrogen sulfide, ammonia and formaldehyde compared to a device containing only the first filter media particles or only the second filter media particles.

Use of physical vapor deposition methodologies to deposit nanoscale gold on activating support media makes the use of catalytically active gold dramatically easier and opens the door to significant improvements associated with developing, making, and using gold-based, catalytic systems. The present invention, therefore, relates to novel features, ingredients, and formulations of gold-based, heterogeneous catalyst systems generally comprising nanoscale gold deposited onto a nanoporous support.

Catalysts, activating agents, support media, and related methodologies useful for making catalyst systems especially when the catalyst is deposited onto the support media using physical vapor deposition

Heterogeneous catalyst systems, methods of making these systems, and methods of using these systems, wherein catalytically active gold is deposited onto composite support media. The composite support media is formed by providing nanoporous material on at least a portion of the surfaces of carbonaceous host material. In representative embodiments, relatively fine, nanoporous guest particles are coated or otherwise provided on surfaces of relatively coarser activated carbon particles. Catalytically active gold may be deposited onto one or both of the guest or host materials either before or after the guest and host materials are combined to from the composite host material. PVD is the preferred catalyst system of depositing gold.

Heterogeneous, composite, carbonaceous catalyst system and methods that use catalytically active gold

An air filter that includes a primary filter and a polishing filter. The primary filter comprises a monoliththat contains active-particulate. The air-to-be-filtered travels through the primary filter in a path generally parallel to the passageways. The polishing filterhas first and second major surfaces and also contains active-particulate. The polishing filter is generally arranged such that air travels from the first major surface to the second major surface when passing through it. The inventive filter demonstrates extraordinary performance over the same primary and polishing filters taken individually.

Active-particulate air filter having monolith primary filter and polishing filter

The present invention provides technology for controlling, or tuning, the catalytic activity of gold provided upon nanoporous supports such as those derived from nanoparticulate titania. It has been discovered that the nature of the surfaces of the nanoparticles used to support a nano-metal catalyst, such as catalytically active gold, has a profound effect upon the catalytic properties of the supported catalyst. The support surface may be altered as desired to control the activity of the gold. The present invention teaches how thermal treatment of nanoparticulate media incorporated into a nanoporous support prior to deposition of catalytically active gold dramatically suppresses the ability of a resultant catalyst system to oxidize hydrogen. Yet, the system still readily oxidizes CO.

Catalytically active gold supported on thermally treated nanoporous supports

Highly active, low pressure drop catalyst systems. Catalytically active material is provided on at least a portion of the channel sidewalls of a body comprising one or more flow-through channels. The channel sidewalls preferably bear a charge, e.g., an electrostatic or electret charge, to help adhere the catalytically active material to the sidewall. The catalytically active material preferably includes gold provided on a particulate support, and PVD techniques are used to deposit catalytically active gold onto the support. Optionally, the gold-bearing particulates may be charged as well in a manner to facilitate attraction between the particulates and the sidewalls.

Low pressure drop, highly active catalyst systems using catalytically active gold

Growing community of inventors

Woodbury, MN, United States of America

Larry A Brey