Addition Of Ammonia Research Articles

Explosion hazard evaluation of renewable hydrogen/ammonia/air fuels

Due to low ignition energy and wide range of flammability limit, explosion hazard of hydrogen/ammonia fuel must be evaluated to ensure safety application. In this work, effects of equivalence ratio, ammonia addition and initial pressure on the flame morphology and explosion pressure are revealed. The results demonstrate that effects of three factors on explosion hazard are ranked from the most important to the least important as initial pressure, equivalence ratio and ammonia hydrogen. The cellular flame formation by varying the equivalence ratio could be mainly attributed to the diffusional-thermal instability. The expanding flame of Φ = 0.8, 1.0 and 1.5 tends to be stable with ammonia addition. As initial pressure increases, there exists a joint and competitive effect of the diffusional-thermal instability and hydrodynamic instability. Maximum explosion pressure of Φ = 0.8, 1.0 and 1.5 decreases monotonously with ammonia addition and increases linearly with initial pressure. The explosion pressure prediction is underestimated using the smooth flame model and reproduced satisfactorily using the wrinkled flame model. By varying equivalence ratio, ammonia addition and initial pressure, the most elementary reaction that enhances laminar flame velocity is R9 and the first two inhibiting reactions to laminar burning velocity are R10 and R168.

Fabrication and study of superficially porous core-shell SiO2@SiO2 microspheres

ABSTRCTCore-shell structure particles are attracting considerable attention because of their applications in drug delivery and catalysis carrier. In this study, SiO2@SiO2 core-shell structure with tunable shell thickness was successfully prepared by using tetraethoxysilane (TEOS) as the silica source. Monodisperse nonporous silica spheres with a diameter of 1.7 μm were synthesized by a modified Stöber method. An template CTAB was first grafted onto the SiO2 microsphere surface. Then TEOS was hydrolyzed with the addition of ammonia. Finally, superficially porous core-shell SiO2@SiO2 microspheres were obtained through calcination to remove the template.

One-step preparation of emulsion-templated amino-functionalized porous organosilica monoliths for highly efficient Cr(VI) removal

In this study, we reported that the amino-functionalized organosilica monoliths (amino-OSMs) without need post-synthesis functionalization were prepared in one-step emulsion-templated method. Herein, formation of organosilica skeleton and amino-functionalization of skeleton surface can be simultaneously realized by addition of ammonia. The SEM images showed that the amino-OSMs had a rich pore structures with high adjustability via the simple change in formulation of the emulsions. The successful graft of amino groups on the surface of the organosilica monolith was confirmed by EDS and XPS measurements. The amino-OSMs prepared in this work show the excellent Cr(VI)-removal capacity from the aqueous solution. It is demonstrated that Cr(VI) adsorption on amino-OSM-3 was best described by Langmuir models and pseudo-second-order kinetic. The adsorption efficiency of amino-OSM-3 for Cr(VI) was measured to be 92.8% at room temperature, still remained as high as 85.1% after five recycles as indicative of the good durability. Furthermore, the treated capacity of amino-OSM-3 is 4.25 kg·g−1 with initial concentration of 200 μg·L−1 through the column with a height of 0.5 cm. Correspondingly, Cr(VI) aqueous solution after treatment meet the requirement of the World Health Organization water discharge standard with Cr(VI) concentration as low as 50 μg·L−1. This work paves the way for the scale-up production of amino-OSMs using emulsion-templated technique for potential application in heavy metal removal.

Effect of Ionic Liquid Additives on the Solubility Behavior and Morphology of Calcium Sulfate Dihydrate (Gypsum) in the Aqueous Sodium Chloride System and Physicochemical Solution Properties at 30 °C

We have investigated the solubility behavior of calcium sulfate dihydrate (gypsum, CaSO4·2H2O) in aqueous NaCl solutions upon the addition of ammonium- or imidazolium-based ionic liquids (ILs), viz., ethylammonium lactate (EAL), 1-ethyl-3-methyl imidazolium hydrogen sulfate ([C2mim]HSO4), and 1-butyl-3-methyl imidazolium hydrogen sulfate ([C4mim]HSO4) at 30 °C. The addition of ammonium lactate ILs increased solubility significantly, ∼500%, whereas the addition of imidazolium hydrogen sulfate ILs decreased the solubility by ∼60%. The addition of ILs shifted the solubility maximum of CaSO4·2H2O toward either higher or lower concentration of NaCl in solution depending on the nature of IL additive. Solution properties such as density (ρ) and speed of sound (u) have been measured for the quaternary systems (CaSO4·2H2O + NaCl + ILs + H2O) at 30 °C. Solution isentropic compressibility (κS) has been derived from measurements of u and ρ. Physical and derived properties have been fitted with suitable polynomial equations. Crystal growth formation and surface morphology of CaSO4·2H2O crystals recrystallized from different aqueous IL solutions have also been examined. IL additives have shown good potential for calcium sulfate scale removal and as calcium sulfate precipitation agent.

Biodegradation of gaseous emissions of 2-chlorotoluene by strains of Rhodococcus sp. in polyurethane foam packed biotrickling filters

About 60,000–70,000 tons of 2-chlorotoluene, which shows high toxicity in aquatic ecosystems, are produced worldwide and used in a tremendous field of applications. However, clear proofs of biodegradation were only presented for Comamonas testosteroni KT5 and Rhodococcus sp. OCT10. Hence, this study aims on the isolation of additional strains and their characterization in pilot-scale biotrickling filters.Three strains named OCT2, OCT9, and OCT14 of the genus Rhodococcus were isolated, able to mineralize gaseous 2-chlorotoluene like the previously isolated strain Rhodococcus sp. OCT10. The performance levels of these strains were tested in four biotrickling filters each containing 18.8 L of polyurethane foam package, showing elimination capacities of carbon (C) of 30.9 (OCT2), 30.1 (OCT9), 32.2 (OCT10), and 3.9 g C·m−3·h−1 (OCT14) at an average crude gas level of 397.6 mg C·m−3 and an empty bed residence time (EBRT) of 22.6 s. Since OCT10 showed the highest performance levels, this strain was characterized in a second biotrickling filter configuration at long-term conditions of 985 days, varying crude gas levels, EBRT and nutrient supply.Chloride balancing showed a recovery of 94.4% of 2-chlorotoluene eliminated out of the gas phase, pointing out mineralization of 2-chlorotoluene. German emission limit values were met at crude gas levels up to 750 mg C·m−3 at EBRTs of 120 s or higher. The maximum elimination capacity was 51.2 g C·m−3·h−1 at a specific freight of 51.9 g C·m−3·h−1 and an EBRT of 254 s. Performance levels were strongly boosted by addition of ammonia as nutrient and stabilized at efficiency levels higher than 90% at a feed rate of 4 g ammonium sulfate per week and 100 L of package volume. Repetitive monitoring of the established 2-chlorotoluene degrading community by BOX-PCR fingerprinting revealed a high long-term stability of OCT10, underlining its suitability in this kind of application.

Computational redesign of enzymes for regio- and enantioselective hydroamination.

Introduction of innovative biocatalytic processes offers great promise for applications in green chemistry. However, owing to limited catalytic performance, the enzymes harvested from nature's biodiversity often need to be improved for their desired functions by time-consuming iterative rounds of laboratory evolution. Here we describe the use of structure-based computational enzyme design to convert Bacillus sp. YM55-1 aspartase, an enzyme with a very narrow substrate scope, to a set of complementary hydroamination biocatalysts. The redesigned enzymes catalyze asymmetric addition of ammonia to substituted acrylates, affording enantiopure aliphatic, polar and aromatic β-amino acids that are valuable building blocks for the synthesis of pharmaceuticals and bioactive compounds. Without a requirement for further optimization by laboratory evolution, the redesigned enzymes exhibit substrate tolerance up to a concentration of 300 g/L, conversion up to 99%, β-regioselectivity >99% and product enantiomeric excess >99%. The results highlight the use of computational design to rapidly adapt an enzyme to industrially viable reactions.

Effects of inorganic and organic nitrogen additions on CO2 emissions in the coastal wetlands of the Yellow River Delta, China

Human activities have increased atmospheric nitrogen (N) deposition, in turn changing CO2 emissions. Many studies concentrated on the relationships between the amount of N deposition and CO2 emissions. However, how N forms affect CO2 emissions is still poorly understood. A two-year field experiment was conducted to investigate the effects of N forms on CO2 emissions in the coastal wetlands of the Yellow River Delta. The N forms consisted of nitrate (NaNO3), ammonium (NH4Cl) and organic N (urea-N: glycin-N = 1: 1), and the level of N addition was 8 g N m−2 yr−1. The CO2 emissions were measured in the growing season from April to October. The results showed that three types of N addition stimulated CO2 emissions (P < 0.05). Compared with the control treatment, nitrate, ammonium and organic N additions increased CO2 emissions by 23.24%, 32.92% and 49.02%, respectively. Nitrate and ammonium additions produced similar and positive effects on CO2 emissions, whereas organic N addition had larger and positive effects on CO2 emissions than those of inorganic N addition (P < 0.05). This may be attributed to the following reasons. First, three types of N addition tended to increase soil β-glucosidase activity and Q10 value of CO2 emissions, but only organic N addition significantly enhanced soil β-glucosidase activity and Q10 value (P < 0.05). Second, inorganic N addition had neutral and negative effects on the decomposition of soil organic carbon (SOC), whereas organic N addition increased SOC decomposition compared with control treatment (P < 0.05). Together, these findings highlight the significance of differentiating the influences of N forms on CO2 emissions.

Effect of the N/C Ratios of Ammonia Added to Process Gas Mixtures on the Morphology and Structure of MPCVD Diamond Films

In this study, N-doped diamond films were prepared through microwave plasma chemical vapor deposition with NH3/CH4/H2 gas mixtures. The effects of the ammonia addition to the process gas mixture on the morphology and structure of diamond films were systematically investigated through characterization by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). This work focuses on the ammonia addition to the process gas mixtures in the narrow range of N/C ratios from 0.4% to 1.0%. The results reveal that different N/C ratios can affect the morphology, the preferred crystal orientation, and the sp3/sp2 ratio in the films. When the N/C ratio of the process gas mixture ranges from 0.6% to 1.0%, the XRD and SEM results show that ammonia addition is beneficial for the growth of the (110) faceted grains. When the N/C ratio of the process gas mixture ranges from 0.8% to 1.0%, the XPS and Raman results indicate that the diamond films exhibit a considerable enhancement in the sp3 fraction.

Tailored Mutants of Phenylalanine Ammonia-Lyase from Petroselinum crispum for the Synthesis of Bulky l- and d-Arylalanines.

Tailored mutants of phenylalanine ammonia‐lyase from Petroselinum crispum (PcPAL) were created and tested in ammonia elimination from various sterically demanding, non‐natural analogues of phenylalanine and in ammonia addition reactions into the corresponding (E)‐arylacrylates. The wild‐type PcPAL was inert or exhibited quite poor conversions in both reactions with all members of the substrate panel. Appropriate single mutations of residue F137 and the highly conserved residue I460 resulted in PcPAL variants that were active in ammonia elimination but still had a poor activity in ammonia addition onto bulky substrates. However, combined mutations that involve I460 besides the well‐studied F137 led to mutants that exhibited activity in ammonia addition as well. The synergistic multiple mutations resulted in substantial substrate scope extension of PcPAL and opened up new biocatalytic routes for the synthesis of both enantiomers of valuable phenylalanine analogues, such as (4‐methoxyphenyl)‐, (napthalen‐2‐yl)‐, ([1,1′‐biphenyl]‐4‐yl)‐, (4′‐fluoro‐[1,1′‐biphenyl]‐4‐yl)‐, and (5‐phenylthiophene‐2‐yl)alanines.

Influence of pH on wet-synthesis of silver decorated hydroxyapatite nanopowder.

Here, effect of solution pH on precipitation of silver decorated hydroxyapatite (Ag-HAp) nano powder during its wet-synthesis was systematically studied. XRD pattern of Ag-HAp nano powder synthesised at pH ranging from 5 to 10 shows that calcium hydrogen phosphate was formed as dominating phase when the solution pH was between 5 and 9 and this phase was gradually transformed into a stable HAp above pH 9. A quantitative analysis of silver amount in Ag-HAp nano powder synthesised at different pH showed that silver can be precipitated to its maximum amount at pH 8 and the further addition of ammonia leads to the formation of a silver-ammonium complex, thereby remaining in the solution. HR-TEM and XPS analysis further confirmed the presence of silver in HAp nanocrystals, synthesised at an optimum pH 9. This trace amount of silver in HAp nano powder showed effective antibacterial activity against Staphylococcus aureus and Escherichia coli. In addition, the cytocompatibility studies carried out on MG63 cells further confirmed the present optimised silver concentration of the Ag-HAp nano powder is well within the toxic limit to be useful in various biomedical applications.

Effects of nitrogen and sulphate addition on methane oxidation in the marsh soil of a typical subtropical estuary (Min River) in China

ABSTRACTMethane (CH4) oxidation plays an important role in regulating the atmospheric CH4 balance. Although nitrogen (N) enhancement and sulphate () deposition are major environmental problems facing the Min River estuary in subtropical China, the interactive effects of N and on CH4 oxidation remain poorly understood. We conducted an incubation experiment to investigate the effects of N and additions on CH4 oxidation in marsh soils. CH4 oxidation exhibited distinct seasonal variations, which correlated with changes in temperature and soil moisture; in addition, CH4 oxidation rates were enhanced by the addition of nitrate (), but were slightly inhibited by the addition of ammonium () and . The combined effects of N and on CH4 oxidation were controlled primarily by the form of N, which may imply that inhibition of CH4 oxidation with addition may be counteracted by N addition, especially in estuarine marsh soils with low N and high concentrations. We propose that, although was more effective in stimulating CH4 oxidation and the inhibition caused by and was minor, CH4 oxidation may be inhibited because was dominant and accompanied by strong deposition in the Min River estuary. As such, future CH4 emissions from estuarine wetlands may increase as a result of higher inputs of and .

Soil microbes promote complementarity effects among co‐existing trees through soil nitrogen partitioning

Abstract Plant resource partitioning is a mechanism promoting species coexistence and ecosystem functioning. Yet, we still have limited understanding of how soil microbes, especially plant symbiotic microbes, influence resource partitioning. We hypothesized that soil‐borne microbes, in particular mycorrhizal fungi, facilitate differential performance of tree species depending on different nitrogen sources and that this leads to a positive plant diversity–community productivity relationship. We conducted two complementing glasshouse experiments. In a “monoculture experiment,” we supplied nitrogen as ammonium, nitrate or glycine and tested the growth response of three tree species associated with different root symbionts: one associated with ectomycorrhizal fungi, one associated with arbuscular mycorrhizal fungi, and the third associated with both arbuscular mycorrhizal fungi and N‐fixing bacteria. In an “intermixed experiment,” we grew the tree species at three richness levels (one, two or three species) in soil supplied with a mix of the three nitrogen forms or no added nitrogen, and with or without soil microbes. The monoculture experiment showed that in the presence of soil microbes, the ectomycorrhizal plant species grew best when supplied with glycine and the two arbuscular mycorrhizal plant species grew best with either nitrate or ammonium addition. When the different forms of nitrogen were mixed in the intermixed experiment, plant mixtures produced more biomass than plant monocultures in the presence of soil microbes, with positive complementarity effects indicating microbe‐mediated plant resource partitioning. Our results suggest that co‐existing tree species can partition soil nitrogen when grown with their particular mycorrhizal symbionts or other soil microbes, resulting in positive biodiversity effects in complex resource environments. A plain language summary is available for this article.

Controlling bromate formation in the Co(II)/peroxymonosulfate process by ammonia, chlorine-ammonia and ammonia-chlorine pretreatment strategies

The Co(II)/peroxymonosulfate (Co(II)/PMS) process, producing sulfate radicals (SO4•-), effectively removes organic pollutants in water, while producing a significant amount of bromate (BrO3−) in the presence of bromide (Br−). This paper investigates the ammonia (NH3) addition, chlorine-ammonia (Cl2-NH3) and ammonia-chlorine (NH3-Cl2) pretreatment strategies in controlling BrO3− formation in 20 min in the Co(II)/PMS process at pH 4.0. The addition of NH3 retarded the BrO3− formation, but only at a reduction level of about 9.5% for NH3 concentration of 50 μM, and was mainly attributed to the protonation of NH3 at pH 4 (99.99% as NH4+, did not react with HOBr). Both the Cl2-NH3 and NH3-Cl2 pretreatment strategies at HOCl and NH3 dosages of 15 and 50 μM, respectively, reduced 95% or more of the overall BrO3− formation and retarded the BrO3− formation, with the NH3-Cl2 pretreatment strategy outperforming Cl2-NH3. The reduction of the BrO3− formation was mainly attributed to the formation of monochloramine (NH2Cl) in both pretreatment strategies. NH2Cl effectively outcompetes SO4•- to react with HOBr and forms NHBrCl, with the apparent reaction rate constant between NH2Cl and HOBr more than 100 times faster than that between SO4•- and HOBr. However, the oxidation/degradation of NHBrCl in the Co(II)/PMS process reforms HOBr, and, although less in quantity, is oxidized to BrO3− at higher Co(II) and Br− concentrations. Thus, the NH3-Cl2 and Cl2-NH3 pretreatment strategies inhibit the BrO3− formation more significantly at lower Co(II) and Br− concentrations. In all cases, the generation of SO4•- in 20 min was not affected by the implementation of the three BrO3− pretreatment strategies.

Biological aspects of microbial-induced calcite precipitation

Microbially-induced calcite precipitation (MICP) is an emerging ground-modification technique. This paper presents the results of laboratory experiments that elucidate some biological factors affecting bioaugmentation and biostimulation strategies of MICP. Co-culture experiments suggest that ureolytic bacterium Sporosarcina pasteurii (DSMZ 33) might release the enzyme urease once introduced into a medium containing non-ureolytic bacterium Bacillus subtilis (DSMZ 6397) due to lysis by the latter, resulting in uncontrolled calcite precipitation. This suggests that exogenous bacteria introduced into a native soil might not survive due to adverse action by indigenous bacteria. It is shown that effective biostimulation of indigenous ureolytic bacteria in low-nutrient sand can be achieved using a stimulation medium containing 200 mM urea, complemented with a simple carbon source (molasses). Changes in microbial population following stimulation were quantified, using genetic enumeration, to show that (a) the net increase in urease activity is not accompanied by increases in the relative abundance of ureolytic bacteria, (b) nitrifying bacteria are part of the enriched indigenous population and (c) nitrifying bacteria can be stimulated by the addition of ammonium only. The use of the lowest effective urea concentration and simple carbon is advocated for sustainable biostimulated MICP, yielding lower ammonium emissions and reduced post-treatment recovery overheads.

Differential Responses of Eukaryotic Phytoplankton to Nitrogenous Nutrients in the North Pacific Subtropical Gyre

Fixed inorganic nitrogen (N) is persistently scarce in the well-lit regions of the subtropical ocean gyres and its supply plays an important role in controlling phytoplankton productivity. In a series of experiments conducted in the North Pacific Subtropical Gyre (NPSG), we examined changes in primary productivity and eukaryotic phytoplankton community structure in response to additions of nitrate (NO3-), ammonium (NH4+), or urea in conjunction with phosphate and silicic acid. Overall, we observed large increases in rates of 14C-primary productivity (~2- to 27-fold) and concentrations of chlorophyll a (~2- to 7-fold) following N addition. Much of the physiological response was due to larger (>3 µm) phytoplankton, whose contributions to primary productivity increased ~2-fold while picophytoplankton (0.2-3 µm) contributions decreased by a similar proportion. Five experiments, conducted in the spring, summer and winter, revealed apparent seasonally-dependent responses in phytoplankton community structure to N availability. During the summer, pennate diatoms increased significantly following N addition as evidenced by both photosynthetic pigment analyses and high-throughput sequencing of 18S rDNA. For example, following the addition of N substrates, concentrations of fucoxanthin (a diatom pigment biomarker) increased between 23- and 49-fold, and relative abundances of rRNA genes belonging to Pseudo-nitzschia increased from negligible (~0.3%) to 30-60% of the >3 µm phytoplankton assemblage. However, unlike the diatom-driven responses observed in the summer, experiments conducted in the spring and winter demonstrated large increases in concentrations of 19’-butanoyloxyfucoxanthin (a pelagophyte pigment biomarker) together with increases in the relative abundance of rRNA genes clustering among Pelagomonas. Overall, our findings revealed differences in the responses of major taxa during experiments conducted in different times of the year, with concomitant impacts on patterns of phytoplankton diversity. In addition, the overall responses in chlorophyll a, 14C-primary production, and eukaryotic phytoplankton community composition appeared largely independent of the type of N substrate added. Our results highlight seasonal-scale differences on the role of N availability in shaping eukaryotic phytoplankton diversity in the surface waters of the oligotrophic NPSG.

Short-term influence of nutrient availability on the uptake and translocation of phenanthrene in mangrove seedlings

The uptake and distribution of phenanthrene, a typical polycyclic aromatic hydrocarbon, in plant tissues of Aegiceras corniculatum and Avicennia marina and the relationship with nutrient (nitrate, ammonium, and soluble reactive phosphorus) availability were investigated. After 12 h of exposure, enhancements in the concentration of nitrate and soluble reactive phosphorus markedly decreased the residual level of phenanthrene in roots, while the addition of ammonium significantly increased the residual concentration. Due to the similar enzymatic degradation potential between treatment groups, the variation of phenanthrene concentration in mangrove roots may result from the H+/phenanthrene cotransport at the root surface that was influenced by nutrient uptake. Moreover, both nitrate and soluble reactive phosphorus amendments significantly increased translocation of phenanthrene from roots to leaves, which likely resulted from the change of hydraulic conductivity in mangrove plants triggered by different nutrient availability.

Effects of Electrolyte Composition on Heat Exchange in Anode Plasma Electrolyte Treatment of Commercial Titanium

The study considers heat exchange in a three-phase system: electrolyte solution—vapour-gas envelope (VGE)—a titanium workpiece. The temperature of a workpiece, current intensity, heat fluxes from the envelope to the electrolyte and the workpiece were measured in an aqueous solution of ammonium chloride with addition of ammonia and glycerol. Addition of ammonia and glycerol proved to decrease current intensity, heating temperature, total energy liberation and heat fluxes to the solution and the sample. Furthermore, it was found that heat shares passing to the electrolyte and the workpiece are not affected by ammonia and glycerol concentrations. The addition of ammonia and glycerol affect heat exchange, increasing the VGE thickness due to intense evaporation of these elements.

Leaching and Precipitation of Thorium Ions from Cataclastic Rocks, Abu Rusheid Area, South Eastern Desert, Egypt

THE LEACHING of thorium from representative samples collected from Abu Rusheid area, south Eastern Desert, Egypt using sulphuric acid has been studied. Factors affecting the leaching of thorium were investigated such as, acid type, S/L ratio, H2SO4 concentration, leaching time, temperature and grain size. The best conditions for leaching of thorium were, H2SO4 acid as the best acid, S/L ratio of 1:5, 3.0 M H2SO4, 2.0 hour of leaching time, -200 mesh size at 90°C. After leaching, the mixture was filtrated then divided into two parts the leach liquor and the residue. The leach liquor was adjusted at pH 1.0 by ammonia solution and addition 10 % oxalic acid. The precipitate obtained was filtrated and dried at 120oC for 1 hour. The obtained precipitate showed 91.60 % of thorium content when using 3.0 M H2SO4 acid. The quality of the precipitate was confirmed by XRF

Radical Chemistry in a Femtosecond Laser Plasma: Photochemical Reduction of Ag⁺ in Liquid Ammonia Solution.

Plasmas with dense concentrations of reactive species such as hydrated electrons and hydroxyl radicals are generated from focusing intense femtosecond laser pulses into aqueous media. These radical species can reduce metal ions such as Au3+ to form metal nanoparticles (NPs). However, the formation of H2O2 by the recombination of hydroxyl radicals inhibits the reduction of Ag+ through back-oxidation. This work has explored the control of hydroxyl radical chemistry in a femtosecond laser-generated plasma through the addition of liquid ammonia. The irradiation of liquid ammonia solutions resulted in a reaction between NH3 and OH·, forming peroxynitrite and ONOO−, and significantly reducing the amount of H2O2 generated. Varying the liquid ammonia concentration controlled the Ag+ reduction rate, forming 12.7 ± 4.9 nm silver nanoparticles at the optimal ammonia concentration. The photochemical mechanisms underlying peroxynitrite formation and Ag+ reduction are discussed.

Interactive effects of nitrogen forms and temperature on soil organic carbon decomposition in the coastal wetland of the Yellow River Delta, China

Nitrogen (N) is a limiting nutrient in many terrestrial ecosystems. Many studies concentrated on the relationships between the amount of N deposition and soil organic carbon (SOC) dynamics. However, few studies are dedicated to differentiate the influence of inorganic and organic N deposition on SOC decomposition. In addition, the interactive effect of different forms of N and temperature on SOC decomposition is still unknown. A short-term incubation experiment was conducted to determine the interactive of N addition (nitrate, ammonium and organic N) and temperature on SOC decomposition in the coastal wetland of the Yellow River Delta, China. The results showed that increased temperature had a positive effect on SOC decomposition (P < 0.05). Both ammonium and organic N additions accelerated SOC decomposition at the initial phase of incubation (P < 0.05), while organic N produced larger and positive effects on SOC decomposition than ammonium at high level of N addition in the initial stage of incubation (P < 0.05). Furthermore, the interactive effect of N additions (i.e. two level of nitrate and organic N additions and a high level of ammonium addition) and temperature on SOC decomposition was mainly an additive effect due to the neutral effect of such N additions on the Q10 value of SOC decomposition. However, a low level of ammonium addition and temperature produced an antagonistic effect on SOC decomposition. This may be attributed to the decreased Q10 value of SOC decomposition at a low level of ammonium addition (P < 0.05). This indicates that short-term SOC decomposition under simultaneous influence of temperature and a low level of ammonium addition may be overestimated based on their single effects. Our results also highlight the importance of differentiating the effects of organic and inorganic N additions on SOC decomposition.