Effect of water vapor on NH_3–NO/NO_2 SCR performance of fresh and aged MnO_x–NbO_x–CeO_2 catalysts

A MnOx-NbOx-CeO2 catalyst for low temperature selective catalytic reduction（SCR） of NOx with NH3 was prepared by a sol-gel method, and characterized by NH3-NO/NO2 SCR catalytic activity, NO/NH3 oxidation activity, NOx/NH3 TPD, XRD, BET, H2-TPR and in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy（DRIFTS）. The results indicate that the Mn Ox-Nb Ox-CeO2 catalyst shows excellent low temperature NH3-SCR activity in the temperature range of 150-300℃. Water vapor inhibits the low temperature activity of the catalyst in standard SCR due to the inhibition of NOx adsorption. As the NO2 content increases in the feed, water vapor does not affect the activity in NO2 SCR. Meanwhile, water vapor significantly enhances the N2 selectivity of the fresh and the aged catalysts due to its inhibition of the decomposition of NH4NO3 into N2O.

Synthesis of an electron-rich aniline-containing dye and its dyeing behaviors on silk through a three-component Mannich-type reaction

Under the guidance of the finding that the tyrosine residues in proteins could undergo three-component Mannich-type reactions with formaldehyde and electron-rich aniline-containing compounds,which forms covalent bonding connections between the protein of interest and the aniline with high levels of selectivity under relatively mild conditions,an orange aromatic primary amine-containing acid dye AMODB was designed and readily synthesized.The molecular structure was characterized by FTIR,^1H NMR,mass spectrometry and elemental analysis.The synthesized dye and a similar control dye（C.I.Acid Yellow 11） without primary amine groups were applied to dye silk fabric by three dyeing processes：Mannich-type dyeing（with and without the addition of formaldehyde） and acidic dyeing.Their washing and rubbing fastness properties with different dyeing methods were examined and compared.It was found that the dyed silk fabric with AMODB by the Mannich-type dyeing showed higher color depth,better anti-stripping ability to DMF and better washing fastness than those of the dyed silk fabric with C.I.Acid Yellow 11 by acidic dyeing due to the covalent bond formation between the dye chromophore of AMODB and silk fiber.In addition,mild Mannich dyeing conditions suitable for silk（AMODB at 3%owf,75：1 liquor-to-goods ratio,dyebath pH 5.5,30℃,10 h） were provided.

A detailed report on mycobacteriosis in Pampus argenteus along the coast of Bay of Bengal,West Bengal,India

Objective:To investigate granuloma associated mycobacteriosis in Pampus argenteus(P.argenteus)(silver pomfrets)and its seasonal prevalence in marine and coastal aquaculture systems of West Bengal,India.Methods:P.argenteus having granulomatous infection were sampled from coastal areas of East Midnapore District of West Bengal from January 2014 to December 2015,encompassing the various seasons.Tissue samples were collected for confirmation by biochemical studies and their prevalence and degree of infection and histopathology was conducted.Results:A total of 197 fishes having haemorrhage like infections in skin and viscera were confirmed for mycobacteria by biochemical analysis,with prevalence of 22.6%.Post-winter season showed higher prevalence(47.97%)followed by winter(35.25%),pre-winter(27.81%),summer(12.5%)and rainy season(2.57%)respectively.Histopathological assessment showed necrotic granuloma in skin,gills and some internal tissues.Ziehl-Neelsen staining of infected tissue samples showed the deposition of acid fast organisms causing swelling and haemorrhages in the tissues.Severity of infection was evaluated by mean cumulative granuloma score(7.89)score.Majority of the acid fast bacilli were recovered from skin,gills and other organs.Biochemical assessment of the acid fast rods confirmed the presence of Mycobacterium spp.Conclusions:The result suggests that the nontuberculous mycobacterial species are responsible for the granulomatous infection in P.argenteus.This infection seems to be influenced by environmental temperature,with the lower temperature favoring the pathogens.