Abstract: An air purification system for a heating, ventilation, and air conditioning (HVAC) system includes an ozone generating device that is used to introduce ozone into an air stream flowing through the ozone generating device. The ozone is used to remove contaminants, including volatile organic compounds (VOCs), from the air stream. The purification system includes sensors in various locations within the HVAC system to measure a concentration of constituents in the air. In some embodiments, the constituents may include ozone and VOCs, such as toluene, butene, and propanal. To control an amount of ozone generated, the purification system controls an amount of electrical power to the ozone generating device. To control a concentration of ozone generated, the purification system controls a flow rate of air through the ozone generating device.

Abstract: A contaminant removal system is disclosed for selectively removing contaminants from a fluid stream. The contaminant removal system has a catalytic reactor of the type that is susceptible to deactivating agents, and is configured to remove contaminants from a fluid stream. The contaminant removal system has a first adsorbent device positioned upstream, with respect to the fluid stream direction, of the catalytic reactor, that is configured to chemically bind with and remove the deactivating agents from the fluid stream. The contaminant removal system can have a second adsorbent device positioned downstream, with respect to the fluid stream direction, of the catalytic reactor. The second adsorbent device is configured to remove undesirable byproducts that may be generated when the catalytic reactor removes contaminants from the fluid stream.

Abstract: Deactivation resistant photocatalysts can be formulated by coating one or more photocatalyst crystals onto a suitable substrate. The photocatalyst crystals are doped with a dopant M. The dopant can be used to repel the silicon-based compound or be used to attract the silicon-based compound. The dopant can uniformly be distributed in the photocatalyst crystals. The dopant can be introduced only to photocatalyst crystals between about 0.1 to about 2 nanometers below the surface of the structure. The doped photocatalyst crystals can be interdispersed with non-doped photocatalyst crystals.

Abstract: Ultraviolet photocatalytic oxidation (UV-PCO) air purification system includes controller that coordinates operation of photocatalytic reactor that removes volatile organic compounds from air and a regeneration mode that removes contaminants adsorbed in UV-PCO system. Controller coordinates operation of the regeneration mode and photocatalytic reactor so that when air purification system is turned on, the regeneration mode begins to operate before photocatalytic reactor is activated. The initial operation of the regeneration mode allows contaminants that have adsorbed in UV-PCO system to be removed before controller initiates a normal operation mode by activating photocatalytic reactor to cleanse the air.

Abstract: A contaminant removal system for selectively removing contaminants from a fluid stream. The contaminant removal system has a catalytic reactor of the type that is susceptible to deactivating agents. The catalytic reactor is configured to remove contaminants from a fluid stream. The contaminant removal system has a first adsorbent device positioned upstream, with respect to the fluid stream direction, of the catalytic reactor, that is configured to remove the deactivating agents from the fluid stream. The contaminant removal system has a second adsorbent device positioned downstream, with respect to the fluid stream direction, of the catalytic reactor. The second adsorbent device is configured to remove undesirable byproducts that may be generated when the catalytic reactor removes contaminants from the fluid stream.

Abstract: A system and method (60) for a purifying a fluid (such as air or water) containing contaminants includes removing the contaminants from the fluid (70) using a capturing device, such as an adsorbent and/or a particle filter. The contaminants may include volatile organic compounds (VOCs) and microorganisms. The method (60) further includes generating ozone molecules using an ozone generating device (62). An ozone decomposition device is used to decompose at least a portion of the ozone molecules into oxygen and oxygen radicals (68). The captured contaminants (VOCs and microorganisms) react with the oxygen radicals and the ozone molecules to denature the contaminants (72), rendering them less harmful than the original contaminants in the fluid. In some cases, the contaminants may be reduced to carbon dioxide and water.