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141.
The oxidation characteristics of NO over Pt/TiO2 (anatase, rutile) catalysts have been determined in a fixed bed reactor as a function of O2, CO and SO2 concentrations in the presence of 8% water. The conversion of NO to NO2 increases with increasing O2 concentration up to 12% and it levels off. This saturation effect is more pronounced over rutile-Pt/TiO2 (r-Pt/TiO2) than that of anatase-Pt/TiO2 (a-Pt/TiO2). The presence of CO increases NO oxidation significantly and this enhanced effect is more pronounced on a-Pt/TiO2 than that on r-Pt/TiO2 with increasing CO concentration at lower temperatures. The same effect is also observed on the catalysts with different Pt and tungsten oxide (WO3) loadings. With increasing Pt and WO3 loadings on TiO2 support (Pt-WO3/TiO2), formation of NO2 is high even at lower temperatures. The presence of SO2 significantly suppresses the oxidation of NO over both r-Pt/TiO2 and a-Pt/TiO2 catalysts but it is less pronounced due to low stability of sulfate on a-Pt/TiO2. 相似文献
142.
The selective catalytic reduction (SCR) characteristics of NO and NO(2) over V(2)O(5)-WO(3)-MnO(2)/TiO(2) catalyst using ammonia as a reducing agent have been determined in a fixed-bed reactor at 200-400 degrees C. The presence of NO(2) enhances the SCR activity at lower temperatures and the optimum ratio of NO(2)/NO(x) is found to be 0.5. During the SCR reactions, there are some side reactions occurred such as ammonia oxidation and N(2)O formation. At higher temperatures, the selective catalytic oxidation of ammonia and the nitrous oxide formation compete with the SCR reactions. The denitrification (DeNO(x)) conversion decreases at lower temperatures but it increases at higher temperatures with increasing SO(2) concentration. The presence of SO(2) in the feeds inhibits N(2)O formation. 相似文献
143.
The Korean government recently proposed expanding the number of soil-quality standards to 30 by 2015. The objectives of our
study were to construct a reasonable protocol for screening priority soil contaminants for inclusion in the planned soil quality
standard expansion. The chemical ranking system of soil pollution substances (CROSS) was first developed to serve as an analytical
tool in chemical scoring and ranking of possible soil pollution substances. CROSS incorporates important parameters commonly
used in several previous chemical ranking and scoring systems and the new soil pollution parameters. CROSS uses soil-related
parameters in its algorithm, including information related to the soil environment, such as soil ecotoxicological data, the
soil toxic release inventory (TRI), and soil partitioning coefficients. Soil TRI and monitoring data were incorporated as
local specific parameters. In addition, CROSS scores the transportability of chemicals in soil because soil contamination
may result in groundwater contamination. Dermal toxicity was used in CROSS only to consider contact with soil. CROSS uses
a certainty score to incorporate data uncertainty. CROSS scores the importance of each candidate substance and assigns rankings
on the basis of total scores. Cadmium was the most highly ranked. Generally, metals were ranked higher than other substances.
Pentachlorophenol, phenol, dieldrin, and methyl tert-butyl ether were ranked the highest among chlorinated compounds, aromatic
compounds, pesticides, and others, respectively. The priority substance list generated from CROSS will be used in selecting
substances for possible inclusion in the Korean soil quality standard expansion; it will also provide important information
for designing a soil-environment management scheme. 相似文献
144.
Uddin Md. Jamal Jeong Yeon-Koo 《Environmental science and pollution research international》2022,29(7):9422-9447
Environmental Science and Pollution Research - Nanoadsorbents having large specific surface area, high pore volume with tunable pore size, affordability and easy magnetic separation gained much... 相似文献