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https://www.readbyqxmd.com/read/27689392/self-protection-mechanism-of-hexagonal-wo3-based-denox-catalysts-against-alkali-poisoning
#1
Li Zheng, Meijuan Zhou, Zhiwei Huang, Yaxin Chen, Jiayi Gao, Zhen Ma, Jianmin Chen, Xingfu Tang
A good catalyst for efficiently controlling NOx emissions often demands strong resistance against alkali poisoning. Although the traditional ion-exchange model, based on acid-base reactions of alkalis with Brønsted acid sites, has been established over the past two decades, it is difficult to be used as a guideline to develop such an alkali-resistant catalyst. Here we establish a self-protection mechanism of deNOx catalysts against alkali poisoning by systematically studying the intrinsic nature of alkali resistance of V2O5/HWO (HWO = hexagonal WO3) that shows excellent resistance to alkali poisoning in selective catalytic reduction of NOx with NH3 (SCR)...
October 12, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27490908/epidemiologic-trends-of-chemical-ocular-burns-in-the-united-states
#2
R Sterling Haring, Isaac D Sheffield, Roomasa Channa, Joseph K Canner, Eric B Schneider
Importance: Determining the national epidemiologic trends of chemical ocular burns can assist physicians and policy makers in appropriate allocation of resources for treatment and prevention. Objective: To describe the epidemiologic trends and risk factors for chemical burns of the eye. Design, Setting, and Participants: Between August 1, 2015, and April 25, 2016, data from the Nationwide Emergency Department Sample were analyzed from January 1, 2010, through December 31, 2013...
October 1, 2016: JAMA Ophthalmology
https://www.readbyqxmd.com/read/26648509/a-high-performing-sulfur-tolerant-and-redox-stable-layered-perovskite-anode-for-direct-hydrocarbon-solid-oxide-fuel-cells
#3
Hanping Ding, Zetian Tao, Shun Liu, Jiujun Zhang
Development of alternative ceramic oxide anode materials is a key step for direct hydrocarbon solid oxide fuel cells (SOFCs). Several lanthanide based layered perovskite-structured oxides demonstrate outstanding oxygen diffusion rate, favorable electronic conductivity, and good oxygen surface exchange kinetics, owing to A-site ordered structure in which lanthanide and alkali-earth ions occupy alternate (001) layers and oxygen vacancies are mainly located in [LnOx] planes. Here we report a nickel-free cation deficient layered perovskite, (PrBa)0...
2015: Scientific Reports
https://www.readbyqxmd.com/read/26587749/alkali-and-sulfur-resistant-tungsten-based-catalysts-for-nox-emissions-control
#4
Zhiwei Huang, Hao Li, Jiayi Gao, Xiao Gu, Li Zheng, Pingping Hu, Ying Xin, Junxiao Chen, Yaxin Chen, Zhaoliang Zhang, Jianmin Chen, Xingfu Tang
The development of catalysts with simultaneous resistance to alkalis and sulfur poisoning is of great importance for efficiently controlling NOx emissions using the selective catalytic reduction of NOx with NH3 (SCR), because the conventional V2O5/WO3-TiO2 catalysts often suffer severe deactivation by alkalis. Here, we support V2O5 on a hexagonal WO3 (HWO) to develop a V2O5/HWO catalyst, which has exceptional resistance to alkali and sulfur poisoning in the SCR reactions. A 350 μmol g(-1) K(+) loading and the presence of 1,300 mg m(-3) SO2 do not almost influence the SCR activity of the V2O5/HWO catalyst, and under the same conditions, the conventional V2O5/WO3-TiO2 catalysts completely lost the SCR activity within 4 h...
December 15, 2015: Environmental Science & Technology
https://www.readbyqxmd.com/read/26457585/renewable-feedstocks-the-problem-of-catalyst-deactivation-and-its-mitigation
#5
REVIEW
Jean-Paul Lange
Much research has been carried out in the last decade to convert bio-based feedstock into fuels and chemicals. Most of the research focuses on developing active and selective catalysts, with much less attention devoted to their long-term stability. This Review considers the main challenges in long-term catalyst stability, discusses some fundamentals, and presents options for their mitigation. Three main challenges are discussed: catalyst fouling, catalyst poisoning, and catalyst destruction. Fouling is generally related to the deposition of insoluble components present in the feed or formed by degradation of the feed or intermediates...
November 2, 2015: Angewandte Chemie
https://www.readbyqxmd.com/read/26104355/spore-resistance-properties
#6
REVIEW
Peter Setlow
Spores of various Bacillus and Clostridium species are among the most resistant life forms known. Since the spores of some species are causative agents of much food spoilage, food poisoning, and human disease, and the spores of Bacillus anthracis are a major bioweapon, there is much interest in the mechanisms of spore resistance and how these spores can be killed. This article will discuss the factors involved in spore resistance to agents such as wet and dry heat, desiccation, UV and γ-radiation, enzymes that hydrolyze bacterial cell walls, and a variety of toxic chemicals, including genotoxic agents, oxidizing agents, aldehydes, acid, and alkali...
October 2014: Microbiology Spectrum
https://www.readbyqxmd.com/read/25696956/-a-case-of-favourable-outcome-of-the-treatment-of-extremely-severe-acute-poisoning-with-methanol
#7
B V Batotsyrenov, G A Livanov, S A Vasil'ev, A V Fedorov, A Iu Antrianov
A case of favourable outcome of the treatment of extremely severe acute poisoning after prolonged exposure to lethal doses of methanol is reported. The complex treatment included urgent and effective elimination of the poison (multiple gastric lavage, hemodialysis), antidote therapy (administration of ethanol), correction of decompensated metabolic acidosis (alkali therapy and infusion therapy with reamberin). These measures had beneficial effect on the clinical course of poisoning and ensured its favourable outcome...
2013: Klinicheskaia Meditsina
https://www.readbyqxmd.com/read/25251454/a-novel-method-applied-in-determination-and-assessment-of-trace-amount-of-lead-and-cadmium-in-rice-from-four-provinces-china
#8
MULTICENTER STUDY
Shan Li, Mei Wang, Bingyi Yang, Yizhou Zhong, Le Feng
Heavy metal contamination of soils or water can lead to excessive lead (Pb) and cadmium (Cd) levels in rice. As cumulative poisons, consumption of Pb and Cd in contaminated rice may cause many toxic effects in humans. In the present study, Pb and Cd levels in rice samples from Hubei, Jiangxi, Heilongjiang, and Guangdong provinces in China were analyzed by cloud point extraction and graphite furnace atomic absorption spectrometry (GFAAS). The heavy metals in the rice samples were reacted with 8-quinolinol to form a complex at pH 9...
2014: PloS One
https://www.readbyqxmd.com/read/25153822/feasible-conversion-of-solid-waste-bauxite-tailings-into-highly-crystalline-4a-zeolite-with-valuable-application
#9
Dongyang Ma, Zhendong Wang, Min Guo, Mei Zhang, Jingbo Liu
Bauxite tailings are a major type of solid wastes generated in the flotation process. The waste by-products caused significant environmental impact. To lessen this hazardous effect from poisonous mine tailings, a feasible and cost-effective solution was conceived and implemented. Our approach focused on reutilization of the bauxite tailings by converting it to 4A zeolite for reuse in diverse applications. Three steps were involved in the bauxite conversion: wet-chemistry, alkali fusion, and crystallization to remove impurities and to prepare porous 4A zeolite...
November 2014: Waste Management
https://www.readbyqxmd.com/read/24910027/enhanced-formaldehyde-oxidation-on-pt-mno%C3%A2-catalysts-modified-with-alkali-metal-salts
#10
Ying Chen, Junhui He, Hua Tian, Donghui Wang, Qiaowen Yang
Novel Pt/MnO2 catalysts modified with alkali metal salts were prepared and exhibited excellent catalytic activity for formaldehyde oxidation. The effects of both cation and anion in the salts were investigated on the structure of catalysts and their catalytic activity. The Na(+) modification was demonstrated to be a facile and effective method to improve the catalysts performance for formaldehyde oxidation, but the anions remaining on the support might act as a mild poison by covering the surface active sites of manganese oxides...
August 15, 2014: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/24634979/deactivation-mechanism-of-potassium-on-the-v%C3%A2-o%C3%A2-ceo%C3%A2-catalysts-for-scr-reaction-acidity-reducibility-and-adsorbed-nox
#11
Yue Peng, Junhua Li, Xu Huang, Xiang Li, Wenkang Su, Xiaoxu Sun, Dezhi Wang, Jiming Hao
A series of V2O5/CeO2 catalysts with different potassium loadings were prepared to investigate alkali deactivations for selective catalytic reduction of NOx with NH3. An alkali poisoning mechanism could be attributed to surface acidity, reducibility, and NOx adsorption/desorption behaviors. The detailed factors are as follows: (1) decrease of surface acidity suppresses NH3 adsorption by strong bonding of alkali to vanadia (major factor); (2) low reducibility prohibits NH3 activation and NO oxidation by formation bonding of alkali to vanadia and ceria (important factor); (3) active NOx(-) species at low temperature diminish because of coverage of alkali on the surfaces (minor factor); and (4) stable, inactive nitrate species at high temperature increase by generating new basic sites (important factor)...
April 15, 2014: Environmental Science & Technology
https://www.readbyqxmd.com/read/24091119/signs-and-symptoms-of-methylmercury-contamination-in-a-first-nations-community-in-northwestern-ontario-canada
#12
COMPARATIVE STUDY
Shigeru Takaoka, Tadashi Fujino, Nobuyuki Hotta, Keishi Ueda, Masanobu Hanada, Masami Tajiri, Yukari Inoue
In 1970, fish caught in the English-Wabigoon River system in northwestern Ontario, Canada, were found to be contaminated with mercury coming from a chlor-alkali plant in the province. In the 1970s, patients exhibiting some of the symptoms of the Hunter-Russell syndrome (e.g. paresthesias, visual field constriction, ataxia, impaired hearing, and speech impairment) were reported by some researchers. However attempts to diagnose the patients as suffering from methylmercury poisoning proved to be controversial...
January 15, 2014: Science of the Total Environment
https://www.readbyqxmd.com/read/23327910/-epidemiological-investigation-of-605-patients-with-chemical-burns-in-northeastern-china
#13
Hua Fan, Feng-bin Liu, Bao-xiang Tian, Xiong Yang, Hai-long Lin, Yang Liu, Chun-lin Wei
OBJECTIVE: To investigate the pathogenic and clinical characteristics of chemical burns in recent years, so as to provide reference for its prevention and treatment. METHODS: Medical records of patients with chemical burns out of 6299 burn patients admitted to our unit from January 1992 to December 2011 were screened and retrospectively analyzed, including gender, age, onset time of the injury, pre-hospital management, injury cause, injury-causing chemicals, body site of wound, burn area and depth, complications, treatment and follow-up results...
December 2012: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/23172835/a-smart-hollandite-deno-x-catalyst-self-protection-against-alkali-poisoning
#14
Zhiwei Huang, Xiao Gu, Wen Wen, Pingping Hu, Michiel Makkee, He Lin, Freek Kapteijn, Xingfu Tang
Banish the villains to their own realm: biomass has gained widespread attention as a renewable energy source. However, commercial catalysts used in power plants (co-)fuelled by biomass are deactivated by the alkali-rich flue gas. In contrast, one of two types of active sites in a promising alkali-resistant hollandite catalyst traps alkali-metal ions to free up the catalytically active sites for the reduction of NO by NH(3).
January 7, 2013: Angewandte Chemie
https://www.readbyqxmd.com/read/23143186/unconventional-promoters-of-catalytic-activity-in-electrocatalysis
#15
YuYe J Tong
Promoters and poisons for catalytic activity have been a subject of intensive research in both heterogeneous catalysis and electrocatalysis for decades, driven primarily by profound financial and societal implications involved because catalyzed reactions are at the center of many enterprises of chemical and petroleum industries. Consequently, there exist well-identified promoters and poisons, such as electropositive alkali elements for the former and electronegative later 2p elements for the latter, respectively...
December 21, 2012: Chemical Society Reviews
https://www.readbyqxmd.com/read/23116295/design-strategies-for-development-of-scr-catalyst-improvement-of-alkali-poisoning-resistance-and-novel-regeneration-method
#16
COMPARATIVE STUDY
Yue Peng, Junhua Li, Wenbo Shi, Jiayu Xu, Jiming Hao
Based on the ideas of the additives modification and regeneration method update, two different strategies were designed to deal with the traditional SCR catalyst poisoned by alkali metals. First, ceria doping on the V(2)O(5)-WO(3)/TiO(2) catalyst could promote the SCR performance even reducing the V loading, which resulted in the enhancement of the catalyst's alkali poisoning resistance. Then, a novel method, electrophoresis treatment, was employed to regenerate the alkali poisoned V(2)O(5)-WO(3)/TiO(2) catalyst...
November 20, 2012: Environmental Science & Technology
https://www.readbyqxmd.com/read/22755274/accidental-poisoning-in-children
#17
Syed Kashif Abbas, Shiyam Sundar Tikmani, Nida Tariq Siddiqui
OBJECTIVE: To assess the pattern of acute poisoning in children at Liaquat National Hospital, Karachi. METHODS: The one-year descriptive study was conducted in the Paediatric Emergency Unit of the Liaquat National Hospital, Karachi, from April 1, 2006 to March 31, 2007, involving all patients under 12 years of age who visited the unit with a history of accidental exposure to toxic substances. Demographic data and all other relevant information were obtained mainly by retrieving hospital records and the admission register...
April 2012: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/22429533/health-effects-associated-with-long-term-occupational-exposure-of-employees-of-a-chlor-alkali-plant-to-mercury
#18
Masoud Neghab, Mohamad Amin Norouzi, Alireza Choobineh, Mohamad Reza Kardaniyan, Jafar Hassan Zadeh
This study aimed to evaluate possible health effects associated with long-term occupational exposure to low levels of mercury vapors. Forty-six subjects exposed to mercury and 65 healthy unexposed employees were studied. The subjects were administered a questionnaire on experienced symptoms and underwent clinical examinations as well as routine biochemical tests. Atmospheric and urinary concentrations of mercury were measured, too. Environmental concentrations of mercury were estimated to be 3.97 ± 6.28 μg/m(3) and urinary concentrations of mercury in exposed and referent groups were 34...
2012: International Journal of Occupational Safety and Ergonomics: JOSE
https://www.readbyqxmd.com/read/22303920/alkali-metal-poisoning-of-a-ceo2-wo3-catalyst-used-in-the-selective-catalytic-reduction-of-nox-with-nh3-an-experimental-and-theoretical-study
#19
Yue Peng, Junhua Li, Liang Chen, Jinghuan Chen, Jian Han, He Zhang, Wei Han
The alkali metal-induced deactivation of a novel CeO(2)-WO(3) (CeW) catalyst used for selective catalytic reduction (SCR) was investigated. The CeW catalyst could resist greater amounts of alkali metals than V(2)O(5)-WO(3)/TiO(2). At the same molar concentration, the K-poisoned catalyst exhibited a greater loss in activity compared with the Na-poisoned catalyst below 200 °C. A combination of experimental and theoretical methods, including NH(3)-TPD, DRIFTS, H(2)-TPR, and density functional theory (DFT) calculations, were used to elucidate the mechanism of the alkali metal deactivation of the CeW catalyst in SCR reaction...
March 6, 2012: Environmental Science & Technology
https://www.readbyqxmd.com/read/22055264/microbial-aspects-of-protein-recovery-from-meat-industry-by-products
#20
G R Swingler, P E Naylor, R A Lawrie
A significant reduction in the number of micro-organisms associated with the bovine meat by-products, lung, rumen and blood plasma, was noted after their alkali-extractable proteins had been spun into a fibrous form. Most of the effect was found when the protein was coagulated in a 10% acetic acid/10% sodium chloride bath. Whereas the approximate shelf-life of raw rumen and lung was three and four days, respectively (at 0°C), proteins isolated from these tissues were relatively stable and could be stored for up to three weeks...
April 1979: Meat Science
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