The present work reports the impregnation of palladium (Pd) or platinum (Pt) on hierarchical porous zeolite catalysts for Volatile Organic Compounds (VOCs) oxidation. (NaYmod) was synthesized via a top-down approach to incorporate mesoporosity into microporous NaY. This process achieved through three steps synthesis: dealumination, desilication and alkaline treatment. 0.5 wt% Pd Pt precursors w...

Abstract The forests of the boreal and mid-latitude zones Northern Hemisphere are largest source reactive volatile organic compounds (VOCs), which have an important impact on processes occurring in atmospheric boundary layer. However, composition biogenic emissions from them remains incompletely characterized, as evidenced by significant excess OH radical concentrations predicted models compari...

ing exhaust plume is drastically enhanced compared to that of the ambient atmosphere (9). Reaction rates are magnified relative to normal conditions due to concentrated levels of directly emitted reactive species such as volatile organic compounds (VOCs), carbon monoxide (CO), sulfur dioxide (SO2), and nitrogen oxides (NOx), all of which are categorized as either a criteria air pollutant or a p...

Volatile organic compounds (VOCs) and odors in cattle rumen gas have been characterized by in-vivo headspace sampling by solid-phase microextraction (SPME) and analysis by gas chromatography-mass spectrometry-olfactometry (GC-MS-O). A novel device enabling headspace SPME (HS-SPME) sampling through a cannula was designed, refined, and used to collect rumen gas samples from steers. A Carboxen-pol...

To better understand the processing of biogenic VOCs (BVOCs) in the pine forests of the US Sierra Nevada, we measured HCHO at Blodgett Research Station using Quantum Cascade Laser Spectroscopy (QCLS) during the Biosphere Effects on Aerosols and Photochemistry Experiment (BEARPEX) of late summer 2007. Four days of the experiment exhibited particularly copious HCHO, with midday peaks between 15–2...

California dairies house approximately 1.8 million lactating and 1.5 million dry cows and heifers. State air regulatory agencies view these dairies as a major air pollutant source, but emissions data are sparse, particularly for volatile organic compounds (VOCs). The objective of this work was to determine VOC emissions from lactating and dry dairy cows and their waste using an environmental ch...

Understanding and quantifying the influence of volatile organic compounds (VOCs) on ozone secondary aerosol formation is essential for better prediction/estimation these products. A total 9 VOCs along with surface were measured during year 2019 at Pune (India) location. The potential (OFP) (SOAFP) estimations are compared 2 methods-using VOC concentrations using their photochemical initial (PIC...

Volatile organic compounds (VOCs) and formaldehyde are ubiquitous in indoor environment. 16 Inhalation of VOCs can cause irritations, difficulty breathing, and nausea, and damage the central 17 nervous system as well as other organs. Formaldehyde is even a carcinogen. Removal of VOCs and 18 formaldehyde is thus critical to control indoor air quality (IAQ). Photocatalytic oxidation has been 19 d...

Volatile organic compounds (VOCs) are ubiquitous in indoor environments. Inhalation of VOCs can cause irritation, difficulty breathing, and nausea, and damage the central nervous system as well as other organs. Formaldehyde is a particularly important VOC as it is even a carcinogen. Removal of VOCs is thus critical to control indoor air quality (IAQ). Photocatalytic oxidation has demonstrated f...

A disposable preoxidation technique that dramatically improves the detection and identification of volatile organic compounds (VOCs) by a colorimetric sensor array is reported. Passing a vapor stream through a tube packed with chromic acid on silica immediately before the colorimetric sensor array substantially increases the sensitivity to less-reactive VOCs and improves the limits of detection...