Temperature Oxidation Research Articles

Effect of Oxidation Temperature on the Crystalline Phase of Polypropylene in Composites with Single-Walled Carbon Nanotubes

Effect of Oxidation Temperature on the Crystalline Phase of Polypropylene in Composites with Single-Walled Carbon Nanotubes

High-temperature oxidation behavior of Inconel 693 alloy at 900 °C–1200 °C

Inconel 693 alloy is a potential nuclear waste vitrification electrode material. The resistance to oxidation at high temperatures can affect the service life of the vitrification process equipment. The high-temperature oxidation behavior of Inconel 693 alloy has been investigated at temperatures of 900 °C, 1050 °C, and 1200 °C. The results show that the kinetic curves obeyed the parabolic-rate law at different oxidation temperatures without abnormal turning points. The oxide film showed a multilayer structure and the oxidation products were similar at different temperatures. Differently, a new product of AlN was generated at 1050 °C and 1200 °C compared with that at 900 °C. At 900 °C, the surface of the alloy was covered with relatively dense and complete oxide films. As the temperature increased, the oxide films were flaked seriously. The oxidation provided effective oxidation protection after 50 h at 1200 °C. In addition, part of the internal oxidation products Al2O3 acted as an effect of pegging Cr2O3 films.

The foaming mechanism and properties of SiO2–Al2O3–CaO-based foamed ceramics with varied foaming agents

To select suitable high-temperature foaming agents, SiO2–Al2O3–CaO-based foam ceramics (SACFC) were successfully prepared with different foaming agents based on phosphorus tailings and coal gangue. The effects of high-temperature foaming agents (CaCO3, carbon black, MnO2 and Fe2O3) on the microstructure and compressive strength of the SACFC were investigated, and the corresponding foaming mechanism was revealed. The results indicated that CaCO3 could increase the porosity of SACFC due to high-temperature decomposition. However, the precipitation of needle-like anorthite reduced the mechanical properties. Because the high-temperature oxidation temperature of carbon black was lower than the molten phase formation temperature, bubbles floated up and gathered on the surface of SACFC, leading to a decrease in strength. The continuous release of O2 from MnO2 during the sintering process promoted the growth and aggregation of large pores, which was detrimental to the strength. The CO2 generated by the redox of Fe2O3 by CO/C was the main factor for the foaming of SACFC. During the high-temperature foaming, the synergy effect of Fe2+ and Fe3+ promoted the formation of a uniformly distributed pore structure. When 2 wt.% Fe2O3 was added, SACFC obtained the optimal comprehensive performance with bulk density and compressive strength of 0.78 g/cm3 and 3.50 MPa.

Oxidation behaviors of Hongqian heavy crude oil characterized by TG-DSC-FTIR-MS within full temperature regions

To better understand in-situ combustion (ISC) theory and reveal the oxidation behavior and mechanism of Hongqian (HQ) heavy crude oil, the thermo-oxidative characteristics and kinetics of HQ heavy oil were studied under air conditions using TG-DSC-FTIR-MS technique. According to the TG/DTG-DSC curves, the oxidation reactions of HQ heavy oil can be divided into low temperature oxidation (LTO), fuel deposition (FD) and high temperature combustion (HTC) stages. The reaction mechanism for each reaction interval was comprehensively analyzed by online FTIR and MS analysis. In FTIR spectra, H2O, hydrocarbon, CO2, CO, –COOH, and aromatic ring were observed during the oxidation process, which are used to explain the occurrence of the possible decomposition/isomerization of hydroperoxides in the later stage of LTO and the important role of light hydrocarbons evaporation, thermal oxidative cracking and polycondensation for coke formation at FD stage, coke combustion at HTC stage, as well as the possible hysteresis of dehydrogenation and aromatization at FD and HTC stages. The strong variation of activation energy with conversion degree confirms the complex oxidation reactions. MS analysis of H2, CH4, H2O, CO, O2, and CO2 produced during oxidation process helps to verify these reaction mechanisms; and provide more information about the in-situ H2 generation and the conditions where H2 generation may occur as well as the generation of CO and its possible reaction mechanism in LTO reactions. These obtained data aid in a deeper insight into crude oil oxidation mechanism and provide reference for establishing accurate reaction scheme and reaction kinetic model for the precise simulation of ISC processes.

The enhancement of benzene total oxidation over RuxCeO2 catalysts at low temperature: The significance of Ru incorporation

Catalytic oxidation is considered to be the most efficient technology for eliminating benzene from waste gas. The challenge is the reduction of the catalytic reaction temperature for the deep oxidation of benzene. Here, highly efficient RuxCeO2 catalysts were utilized to turn the number of surface oxygen vacancies and Ce–O–Ru bonds via a one-step hydrothermal method, resulting in a preferable low-temperature reducibility for the total oxidation of benzene. The T50 of the Ru0.2CeO2 catalyst for benzene oxidation was 135 °C, which was better than that of pristine CeO2 (239 °C) and 0.2Ru/CeO2 (190 °C). The superior performance of Ru0.2CeO2 was attributed to its large surface area (approximately 114.23 m2·g−1), abundant surface oxygen vacancies, and Ce–O–Ru bonds. The incorporation of Ru into the CeO2 lattice could effectively facilitate the destruction of the CeO bond and the facile release of lattice oxygen, inducing the generation of surface oxygen vacancies. Meanwhile, the bridging action of Ce–O–Ru bonds accelerated electron transfer and lattice oxygen transportation, which had a synergistic effect with surface oxygen vacancies to reduce the reaction temperature. The Ru0.2CeO2 catalyst also exhibited high catalytic stability, water tolerance, and impact resistance in terms of benzene abatement. Using in situ infrared spectroscopy, it was demonstrated that the Ru0.2CeO2 catalyst can effectively enhance the accumulation of maleate species, which are key intermediates for benzene ring opening, thereby enhancing the deep oxidation of benzene.

An improved flamelet/progress variable modeling in a hydrogen-fueled scramjet

The compressible nature of the supersonic combustion flow field results in significant temperature and pressure fluctuations. In the standard Flamelet/Progress Variable (FPV) model, not only is it difficult to specify the tabulation boundary conditions for the flamelet database, but using a single fixed flamelet database to describe the entire complex flow field will likely introduce significant errors. To account for this, an improved FPV model is proposed in this study. Dynamic adjustment of the tabulation pressure in the flamelet database is achieved by scaling the benchmark flamelet database to match the local pressure. Real-time calibration of the tabulation oxidant temperature and fuel temperature is also achieved by real-time statistics and interpolation between four flamelet databases. This allows the improved FPV model to adaptively match the target supersonic combustion flow field without the difficulty of specifying tabulation pressures and temperatures as in the standard FPV model, and it avoids the limitations imposed by the single flamelet database. An additional species transport equation is also incorporated into this model to improve species prediction. Based on the simulations of a hydrogen-fueled scramjet with low-and-high total temperature, the improved model is shown to better restore wall-pressure profiles, combustion mode predictions and OH (hydroxyl radical) distributions, compared to the standard FPV model and comparable studies. This indicates that the effects of compressibility on the chemical reaction rates have been considered.

Low temperature synthesis of VO2 and hysteresis free VOx thin films with high temperature coefficient of resistance for bolometer applications

Vanadium dioxide (VO2) is an insulator to metal phase transition material, which finds many electronic and optical applications due to its reversible switching while VOx-based bolometers are widely used in commercial uncooled infrared detectors due to their high-temperature coefficient of resistance and low resistivity. Atmospheric pressure thermal oxidation (APTO) of Vanadium (V) is a simple process used to synthesize VO2 films without the need for precise control of oxygen partial pressure unlike other synthesis methods. In this work, we report the effect of reducing the V oxidation temperature to 250–450 °C during APTO and synthesize films with different oxidation durations. For an optimized oxidation duration at each oxidation temperature, VO2 films are obtained with more than two orders of resistance switching. This optimum oxidation duration is found to decrease exponentially with increase in oxidation temperature with an activation energy of 1.05 eV. The phase transition temperature of these VO2 films is found to decrease monotonically with decrease in oxidation temperature. We also observe that partially oxidized (oxidation time less than optimized oxidation duration to form VO2) VOx films show broad resistance switching from room temperature up to 70 °C instead of steep switching at the phase transition temperature. The partially oxidized film shows a temperature coefficient of resistance (TCR) as high as ∼10%/K, which is 3–4 times greater than TCR of commercial VOx thin films used in bolometers while showing similar resistivity. The resistivity of these films also exhibits almost zero hysteresis with temperature, an important requirement for bolometer applications. This study will widen the usefulness of the APTO process for fabricating VO2-based devices and high TCR VOx films for bolometer applications. The demonstrated low temperature process will especially be suitable to integrate VO2/VOx on substrates which can sustain only low temperatures such as some of the flexible substrates.

Production of silicon nanoparticles and surface modification through photochemical nanocatalysis reaction

In this research, a novel method for manufacturing silicon (Si) nanoparticles (NPs) has been proposed. The process involves the use of ultraviolet (UV) irradiation and acrylic acid (AA) to induce Si NPs-AA polymerization. Si particles of varying sizes and an AA dispersion solution were subjected to UV radiation, leading to the formation of Si NPs coated with AA polymer, which separated to the top due to the volume increase. The Fourier-transform infrared (FT-IR) spectra confirmed the reaction between Si and AA by verifying the peak positions of the newly formed Si–C bond. The physical and chemical particle size measurements revealed that the Si NPs were surrounded by short-chain AA polymer clusters, accounting for approximately 15% of the cluster weight. Moreover, the Si particles' oxidation temperature in the Si NPs-AA cluster significantly decreased to about 450 °C. This technology holds promising potential for use in luminescent semiconductor materials, as it enables the selective separation of Si NPs.

Thermal oxidation of degradation products from thermoplastic polyvinyl alcohol: Determination on oxidation temperature and residence time

The degradable protective articles made of thermoplastic polyvinyl alcohol (TPVA) are widely used in nuclear power plants, and they are thermally decomposed after use to reduce solid waste. However, in the real decomposition of TPVA, the temperature in the oxidation reactor is not self-sustaining; as a result, the degradation products contain a lot of CO, resulting in more pollution and energy waste. In this paper, jet stirred reactor (JSR) and Chemkin software were used to study the reaction kinetics characteristics of the oxidation process of degradation products from TPVA in the range of 550 °C–700 °C. Both experiments and kinetic simulation show that a higher average temperature of the oxidation reactor is needed to achieve lower CO emissions. When using 5% or 10% TPVA degradation solution, the average temperature should not befall below 625 °C or 675 °C. The corresponding residence time should be greater than 6 s and 5 s respectively. The combination of research findings and engineering practice provides great help to the optimization of the actual work process.

Time-Dependent Power-Law Growth of Oxide with Anomalous Diffusion in the Thermal Oxidation of 4H-SiC\((11\bar{2}0)\) and 4H-SiC\((000\bar{1})\)

A model for the oxide growth in the thermal oxidation of SiC with a non-polar surface orientation is proposed. It is based on the reaction–diffusion equations (RDEs), in which the diffusion of both SiO and O2 molecules is considered. By taking the 4H-SiC\((11\bar{2}0)\) a-face as an example, the RDEs are integrated numerically at the oxidation temperature of T = 1150 °C and the partial pressure of oxygen molecules in the ambient environment of Pox = 0.25, 0.5, 1, 2, and 4 (atm). By analyzing the simulation results on the evolution of the oxide thickness xo, it is found that xo obtained by the simulations and those of the experiments reported in the literature collapse onto a single curve when they are plotted against the rescaled time t′ = (ωp/ω1)t, where t denotes the oxidation time and ωp is defined as ωp = Θs(Pox)νinc. Here, Θs(Pox) and νinc denote the steady-state density of the oxygen molecules chemisorbed on the oxide surface and the prefactor for the incorporation rate of the oxygen molecules from the oxide surface into the oxide layer, respectively; ω1 is a constant, which is given by \(\omega_{1} = \omega_{p}|_{P_{\text{ox}} = 1(\text{atm})}\). The curve yielded by the collapse is found to follow the time-dependent power law (TDPL) as xo(t) ∝ (t/τ)ν(t), where the exponent ν(t) is given by \(\nu (t) = 0.565 + 0.2/(1 + \sqrt{2t/\tau } )\) with τ [= 1 (h)] a constant. This property is found to be valid also for the oxidation of a polar surface, 4H-SiC\((000\bar{1})\), by comparing the results of the calculations according to xo(t) ∝ (t/τ)ν(t) with the experiments reported in the literature. Therefore, the oxide growth in these systems follows the TDPL with the anomalous diffusion of νD = 0.565, which is larger than the normal diffusion of νD = 0.5 observed in the thermal oxidation of Si. In addition, the transition between the etching mode at low Pox and the oxidation mode at high Pox on the 4H-SiC\((11\bar{2}0)\) a-face is found to occur at \(P_{\text{c}} \simeq 0.73\) (atm) at T = 1150 °C.

Influence of Cr Content on the High-Temperature Oxidation Behavior and Mechanism of Low-Alloy Steels.

The high-temperature oxidation behavior of low-carbon steel (AISI 1015, AISI 8617, AISI 4115) was investigated over the temperature range from 600 to 1000 °C in humid air containing 25% water vapor. Mass gain of oxidation measurement was performed to study the oxidation kinetics. The microstructure, thickness, and composition of the oxide scale formed were investigated via optical microscope (OM), scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS), X-ray diffraction (XRD), and electron probe microanalyzer (EPMA). The oxidation process was performed from 2 to 100 min. As the oxidation time increased, the trend of mass gain per unit area switched from a linear to a parabolic law, regardless of the steel grade used. As the chromium content increased, the duration of time during which the oxidation rate followed a linear relationship decreased. In the low-alloy steel with higher chromium content, the thickness of the mixed oxide layer containing Cr increased and the oxidation rate decreased at all oxidation temperatures.

Impact of thermal oxidation parameters on micro-hardness and hot corrosion of Ti-6Al-3Mo-2Nb-2Sn-2Zr-1.5Cr alloy

Protective oxide layers on Ti-6Al-3Mo-2Nb-2Sn-2Zr-1.5Cr (TC21) alloy with equiaxed microstructure considerably influence micro-hardness and hot corrosion resistance. The present work’s thermal oxidation of TC21 alloy was performed at 600, 700, and 800 °C for 5, 20, and 50 h durations. Hot corrosion methods in NaCl and NaCl + Na2SO4 salt media were applied to raw (unoxidized) and oxidized samples at 600 and 800 °C for 50 h. Hot corrosion was conducted at 600 °C for 5 cycles with 10-h steps. The best oxide layer thickness was observed at 800 °C, which increased with increased oxidation time and temperature. The surface hardness of the oxide layer at 800 °C was 900 ± 60 HV0.05 owing to the formation of TiO2 and Al2O3 phases. Raw material hardness was 342 ± 20 HV0.05, increasing threefold due to thermal oxidation. In the case of NaCl, weight loss dominated all samples except at 800 °C for 5 h. In the case of NaCl + Na2SO4, weight gain occurred at 600 and 800 °C for 5 h. Weight loss occurred for the raw samples and those processed at 800 °C for 20 and 50 h, where the oxide layer flaked off. Surface hardness increased upon hot corrosion testing because of the formation of brittle phases, such as TiO2 and Na4Ti5O12. Samples that oxidized at 800 °C for 5 h had the highest hardness and corrosion resistance.

Numerical investigations on hydrothermal flame characteristics of water-cooled hydrothermal burner

Abstract Supercritical hydrothermal combustion, as a quick homogeneous oxidizing process, offers a promising treatment option for industrial wastewater. This paper established a computational fluid dynamics model of a water-cooled hydrothermal combustion burner to investigate the thermal flame characteristics. The effects of the fuel mass flow rate, fuel concentration, initial reactor temperature, reaction pressure, and oxidant temperature on the thermal combustion ignition were revealed. The results indicate that the fuel concentration (from 10 wt% to 60 wt%) and initial reactor temperature (from 623 to 773 K) had less effect on the ignition temperature. In contrast, the ignition temperature increases by 398 K with increasing fuel mass flow rate (from 24 kg h−1 to 1080 kg h−1). As the oxygen temperature increases (from 273 to 673 K), the ignition temperature gradually decreases to 573 K and then increases. An increase in reaction pressure can facilitate a decrease in ignition temperature to a certain extent, and the optimal reaction pressure is 25 MPa. This study provides a vital reference for a hydrothermal burner’s scale-up design and ignition operation.

An experimental and modeling study on the ozone-assisted low-temperature ignition of methylcyclohexane in an RCM

Methylcyclohexane (MCH) is a significant component of practical fuels and has garnered significant research interest in recent years. However, due to the low reactivity of MCH, ignition data below the temperature of 680 K are still lacking. To extend the experimental condition of MCH ignition to a lower temperature range, ozone (O3) was used as an active additive to assist in the kinetic investigation of the low-temperature ignition chemistry of MCH. Ignition delay times (IDTs) and the first-stage IDTs for MCH containing varying concentrations of O3 (0, 100, and 500 ppm) were determined in a rapid compression machine (RCM) under the pressure of 20 bar, equivalence ratios of 1.0 and 1.5, and temperatures in the range of 616–864 K. Species profiles during the auto-ignition of MCH at 615 K and 795 K were recorded using a fast sampling system combined with the gas chromatography (GC) technique. A kinetic model for MCH ignition with O3 addition was developed with some key reaction rates updated based on our newly obtained data. The promotional effects of O3 on the ignition of MCH were observed through both the IDTs and species evolutions. The negative temperature coefficient (NTC) behavior of MCH ignition disappeared in the presence of 500 ppm O3. The production of intermediate species displayed varying tendencies, with the formation of acetaldehyde (CH3CHO) being favored over other small alkenes. Moreover, the production of ethane (C2H6) was detected under 615 K with 500 ppm O3 addition, which was not reported in previous works concerning MCH combustion. Model analysis revealed that the oxidation pathways for ROO radicals of MCH altered because the addition of O3 shifted the onset of the oxidation temperature to a lower region, making the generation of RO radicals significantly favored. Therefore, the experimental species profiles can provide additional kinetic information for the low-temperature oxidation chemistry of MCH, and the corresponding data effectively highlighted and constrained the reaction rates of ROO radicals yielding RO radicals. Further model simulation indicated that the intramolecular hydrogen immigration of ROO radicals and the following secondary O2 addition oxidation pathways of MCH can be nearly frozen if the onset oxidation temperature is shifted as low as 550 K with 1000 ppm O3.

Promising SnOx electron transport layer for polymer solar cells

In this study, SnOx films were synthesized via thermal oxidation of Sn films at various temperatures ranging from 300 °C to 500 °C. The impact of oxidation temperature on the structural, optical, and electronic properties of the SnOx films was investigated using SEM, EDX, optical absorption, and impedance spectroscopy techniques. It was found that the oxidation temperature has a significant impact on the SnOx resistance, which decreases as the temperature increases due to improved SnOx crystallinity and enhanced electron mobility. Furthermore, an increase in recombination resistance suggests an improvement in interface quality and reduced charge recombination processes. Finally, the impact of SnOx electron transport layer properties on the photovoltaic characteristics of organic solar cells was investigated. It was observed that OSCs based on SnOx ETL obtained at higher oxidation temperature reveal enhanced photovoltaic characteristics.

Effect of rare-earth-containing inhibitors on the low-temperature oxidation characteristics and thermodynamic properties of coal

The frequent occurrence of coal spontaneous combustion (CSC) disasters poses a serious threat to green and safe coal production. Currently, inhibitor application is a crucial method for preventing CSC. In this study, layered double hydroxides (LDHs) were modified using the rare-earth element La3+ to prepare inhibitors (La/LDHs) with varying La3+ content. The prepared La/LDHs were characterized through X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Through a temperature-programmed method and thermogravimetry–differential scanning calorimetry, the effect of the prepared La/LDHs on the low-temperature (30–170 °C) oxidation characteristics and thermodynamic properties of coal were investigated, and the CSC inhibition mechanism of La/LDHs was determined. The results indicated that five La/LDH inhibitors were successfully prepared. The CO concentration, CO generation rate, and oxygen absorption rate of coal samples decreased after the addition of La/LDHs. Moreover, the CSC inhibition effect of the La/LDHs was the strongest at oxidation temperatures of 110–130 °C. The composite coal samples containing La/LDHs exhibited higher adsorption temperature (T0), critical temperature (T1), stagnation temperature (T2), growth-rate temperature (T3), and burnout temperature (T7) but lower mass-maxima temperature (T4), kindling-point temperature (T5), and maximum-weight-loss-rate temperature (T6). The La/LDHs shortened the heat release process of coal and considerably reduced the quantity of heat released, with a maximum reduction of 474 J/g. Moreover, the apparent activation energy increased in the mass gain stage and the thermal decomposition stage, with the highest increases of 148.7 and 233.2 kJ/mol, respectively. Among the prepared samples, La/LDH-3 and La/LDH-5 exhibited the strongest CSC inhibition effects. These research results have important practical implications for the prevention and control of CSC during coal production and storage, and for improving environmental protection and safety in coal production.

Effect of Ag addition on the oxidation behavior of CrAlN coating at elevated temperatures

The effect of oxidation temperature and amount of Ag addition on CrAlN coating was investigated in this study. No Ag and Ag-based CrAlN coatings were deposited on a substrate using a physical vapor deposition (PVD) technique. The coatings then were isothermally heated at 800 °C and 900 °C for the 2 hr. Interestingly it is found that even with a small difference in temperature (100 °C), CrAlNAg coating shows different nature of oxidation, mass gain curve, coating microstructure and surface morphology.Surface morphology revels the Ag clusters formation on the top associated with the high temperature heating. While cross-section morphology gives information about Ag distribution and oxides layer formation. Mass gain curve and EDS (Energy-dispersive X-ray spectroscopy) results revealed that the oxidation resistant behavior of the CrAlN coating was degrade with increasing Ag content and/or increasing oxidation temperature. Overall, the results suggest that the temperature has a significant effect on the microstructure and properties of Ag-based coatings, and optimizing the deposition temperature can improve the performance of these coatings in various applications.

High Temperature Oxidation Behavior of 439 Ferritic Stainless Steel at Different Temperatures

In recent years, due to the installation of selective catalytic reduction (Selective Catalytic Reduction, hereinafter referred to as SCR) devices, high temperature oxidation failure has occurred frequently in automobile exhaust systems. To explore its high temperature failure mechanism, this paper takes 439 ferritic stainless steel which is often used in automobile exhaust pipes as an example and uses XRD, SEM, and EDS experimental methods to study its oxidation behavior at 700 °C, 800 °C and 900 °C. The results show that the oxide layer becomes thicker and the failure degree increases with the increase of the working temperature of 439 stainless steel. The oxidation products at different temperatures are different. When the oxidation temperature is 700 °C, the phase structure of the oxide layer on the surface of the sample is Cr2O3 and Fe2O3, and the oxide layer is dense and uniform. As the temperature rises to 800 °C, the surface oxidation products are sintered together, and the needle-like Fe2O3 structure appears on the oxide film. When the oxidation temperature rises to 900 °C, the oxide layer appears inner and outer layers, the outer layer is Fe2O3 shell structure, the inner layer is generated FeO, Fe2O3, and other iron oxides, and oxidation is very serious. At the junction of the oxide layer and the substrate, there are particles such as SiO2, TiO2, Fe2Nb in the substrate, which has a positive effect on the high temperature oxidation.

Design of Nano-Catalyst for Removal of Phenolic Compounds from Wastewater by Oxidation Using Modified Digital Basket Baffle Batch Reactor: Experiments and Modeling

Removal of phenol and phenolic compounds from wastewater using various techniques has received considerable attention in recent years. In this work, the removal of phenol from a model solution of phenol via catalytic oxidation is investigated with oxidant H2O2. For this purpose, we designed a new nano-catalyst (8% Fe2O3/AC) by loading iron oxide nanoparticles over nano-activated carbon via the impregnation process. We modified the recently developed digital basket baffle batch reactor (DBBBR) and used it for the catalytic oxidation process in order to examine the activity of the prepared nano-catalyst. The highest efficiency of phenol removal was found to be 95.35% under the following parameters: oxidation time of 120 min, oxidation temperature at 85 °C, and stirrer speed of 600 rpm. The minimization of the sum of the squared error between the experimental data and predicted results of phenol removal was considered as a base for the optimization technique to estimate the optimal parameters for the kinetic process. The predicted conversion of phenol excellently agreed with the experimental results (absolute average errors < 5%) for a wide range of process parameters.

Assessment of the safety and probiotic properties of Lactobacillus delbrueckii DMLD-H1 based on comprehensive genomic and phenotypic analysis

Lactobacillus delbrueckii is widely used in the fermentation industry. Previously, we identified Lactobacillus delbrueckii DMLD-H1, a strain of Lactobacillus delbrueckii subsp. bulgaricus, from traditional Chinese fermented milk. In this research, we sequenced the complete genome of DMLD-H1, which contains 1,836,627 bp in length with a total of 1947 genes and an average G + C content of 49.86%. In total, 103 carbohydrate metabolism genes are annotated in the KEGG database, and it is showed that DMLD-H1 has the ability to transport lactose, glucose, fructose, and mannose. Antibiotic resistance genes, genes encoding toxins and virulence factor genes are absent in risk-associated sequences of DMLD-H1. We also confirm its safety by indole assay, nitroreductase assay, and antibiotic resistance tests. A wide range of stress-related proteins may contribute to the survival of DMLD-H1 in the gastrointestinal environment, including oxidative stress, pH, bile salts, and temperature stress. The large number of adhesion proteins and stress response genes identified in DMLD-H1 in the genome-wide analysis, as well as phenotypic experiments including resistance to bile salts and acid, antioxidant, antimicrobial and self-cohesion activity, exhibited its excellent probiotic properties. This study demonstrates that DMLD-H1 can be a candidate fermentative agent in fermented dairy products.