FUEL
·
2024
·
IF 6.7
Zhongwei Meng,Zhongqiang Bao,Zhao Chen,Bosong Zeng,Zihan Qin,Jie Tan,Ping Pu
The regeneration characteristics of a diesel particulate filter (DPF) are studied on a regeneration test bench, with a focus on the effects of ash and catalyst, including the effects of ZnO and CeO 2 on the regeneration performance and emission characteristics of the DPF. The results indicate that the addition of ZnO and CeO 2 can easily lead to local high temperatures during the regeneration process of the DPF, with the highest peak temperature appearing in a 1:3 ratio for both ZnO and CeO 2 , leading to a significant increase in CO 2 . Compared with ZnO, CeO 2 can advance the DPF rapid regeneration period by about 300 s. When the ratio of PU: CeO 2 is 1:5, the total particulate matter emitted is reduced to the lowest level, but it will significantly increase the emission of nuclear model particles, especially particles below 23 nm. Under the same mixing ratio, an increase in carbon loading can enhance the oxidation ability of ZnO towards carbon black, but the difference between the number of particles emitted during DPF regeneration and regeneration efficiency will gradually decrease.
研究领域:
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2019
·
IF 5.128
Jia Fang,Rong Shi,Zhongwei Meng,Yuan Jiang,Zihan Qin,Qian Zhang,Yuan Qin,Jie Tan,Weilian Bai
The interaction effect of catalyst and ash on commercial carbon black (Printex U, PU) oxidation is investigated using non-isothermal thermogravimetric analysis (TGA). The presence of commercial catalysts TiO 2 and CeO 2 decrease the start, peak and end temperatures of soot oxidation, and increase the comprehensive oxidation index. Compared with PU/TiO 2 mixture, PU/CeO 2 mixture has lower activation energy and higher comprehensive oxidation index because CeO 2 has the higher oxygen storage and better active oxygen generation capacities. The impact of CeO 2 is shown to be the most significant at 1:5 wt ratio between soot and catalyst among various ratios. Compared with pure PU, the comprehensive oxidation index for 1:5 wt ratio of PU/CeO 2 increases from 0.97*10 −7 % 2 min −2 °C −3 to 1.58*10 −7 % 2 min −2 °C −3 . The comprehensive oxidation index can further increase by adding ashes. Compared with PU/CeO 2 /Al 2 O 3 , PU/CeO 2 /MgO and PU/CeO 2 /CaSO 4 mixtures, PU/CeO 2 /ZnO mixture has the maximum comprehensive oxidation index. The most significant impact of potential ash on PU/CeO2 is observed with 1:5:5 wt ratio of PU/CeO 2 /ZnO among soot, catalyst and ash, which has the maximum comprehensive oxidation index 2.41*10 −7 % 2 min −2 °C −3 . The comprehensive oxidation index of 1:5:5 wt ratio of PU/CeO 2 /ZnO increases by 148% compared with pure PU. This work is beneficial to demonstrate the interaction mechanism of the catalyst and ash on soot oxidation process under O 2 /N 2 atmosphere.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 21
·12311-12320
·
IF 4.4
Fang Jia,Yi Chengcheng,Pu Ping,Chen Chen,Yang Yi,Wang Jiaxin,Lin Bin
Ag/CeO 2 catalyst is synthesized by hydrothermal method, which has been studied under the effects of different catalyst content, ash and Ag load through activity and characterization tests. Ag loading increases the catalytic activity of CeO 2 , and the peak combustion temperature of soot decreases by 74 °C. The catalytic effect of Ag/CeO 2 is affected by catalyst content, Ag load and ash content. The optimum mass ratio of soot/catalyst is 1/10, and 10 mass% is the saturation value of Ag loading at CeO 2 . Ash inhibits the promoting effect of Ag/CeO 2 in the oxidation process of soot. This study provides a theoretical basis for the industrial application of Ag/CeO 2 catalyst in gasoline engine and also provides a research idea for the low-temperature oxidation of soot.
研究领域:
催化
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Jia Fang,Zihan Qin,Zhongwei Meng,Yuan Jiang,Jing Liu,Qian Zhang,Jie Tan
This paper studies the impact of ash component, ash particle diameter, soot particles (Printex U, PU)/ash stratification method, and PU/ash mixing ratio on the oxidation process by the thermogravimetric method. Compared with PU/Al2O3 and PU/MgO mixtures, the PU/ZnO mixture has the lowest peak temperature 560 °C and the highest comprehensive oxidation index 2.15 × 10–7%2 min–2 °C–3. ZnO particles (50 nm) lead to lower peak temperature and larger comprehensive oxidation index compared with 200 nm ZnO particles. The tight contact stratification method is better than other ash up and ash down stratification methods because of the heat transferring and the diffusion of oxygen within the particle stratification methods. The 1:15 wt ratio is the best ratio between PU/ZnO particles. The maximum comprehensive oxidation index is 2.21 × 10–7%2 min–2 °C–3, and the minimum peak temperature is 545 °C. Compared with the pure PU, the comprehensive oxidation index and minimum peak temperature improve 126 and 12%, respectively. This study is beneficial for modeling diesel particulate filter regeneration and designing efficient regeneration techniques.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2021
·Vol. 36
·期 3
·435-442
·
IF 1.04
Yuanyuan Bai,Hao Wang,Tsolmon Borjigin,Han Zheng,Yang Yang,Jiao Xie,Meng Wang,Jianbo Zhan,Ying Wan,Wen Liu
The ash condensation ability of the cigarette paper is an important factor affecting the cigarette grades. In this study, we put forward an effective method of improving this ability. Xanthan gum was successfully synthesized, applied as an ash integrator in the dip-coating process of cigarette paper production, and showed good performance. Cationic guar gum, cellulose phosphate and Hydroxyapatite (HAP) have been added in the pulp and showed better performance of the ash condensation property. The ash become much whiter and the scatter of the ash have been suppressed. Moreover, the further addition of HAP would result in a worse combustion efficiency, leading to the burning out of the cigarette in early time.
研究领域:
材料科学
·
烟草研究
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yanjie Niu,Jie Xu,Zekai Miao,Fanhui Guo,Yixin Zhang,Jianjun Wu
From the perspective of environmental protection and resource utilization, the feasibility of treating m -cresol wastewater with coal gasification fine slag (GFS) as particle electrodes in an electrocatalytic system was evaluated to achieve the purpose of treating waste with waste. Characterization by scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET), Raman, and fourier transform infrared spectroscopy (FTIR) confirmed that the GFS featured a diverse inorganic framework, large specific surface area (as large as above 155 m 2 g −1 ), hierarchical porous structure, and plenty of catalytic sites. The Venn diagram method was used to systematically propose the following distribution modes of residual carbon (RC) and ash in GFS: discrete distribution, embedded distribution, crosslinked distribution, and association and bonding. Only 8 g L −1 of GFS particle electrodes prevented the formation of a yellow sticky passivation film on the anode. Compared to the two-dimensional electrocatalytic system (47.89%), the wastewater treatment efficiency was increased by 108.81%. Zero-order kinetic results showed that the reaction rate constant was the highest (2.1106 mg L −1 ·min −1 ) when the secondary flotation RC was adopted as particle electrodes. It was indicated that GFS in discrete mode played either no role or at most a minor role. Last but not least, the synergy of RC and ash was revealed from a molecular perspective. The RC exhibited hierarchical microporous/mesoporous/macroporous structure, which facilitated the entry of H 2 O 2 into the catalytic sites of ash. Abundant catalytic sites in ash accelerated adsorption and oxidation processes on RC surfaces.
研究领域:
环境科学
·
资源利用
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2023
·
IF 5.7
Chengcheng Yi,Jia Fang,Xilong Xu,Kejian Wang,Zinong Zuo,Zhiqiang Han
This paper studies the effects of ash species and ash aging deposition on the physical and chemical properties of KC catalysts. By thermogravimetric analysis (TGA), the pure KC catalyst has good stability and catalytic activity at 600 °C. In the loosely contacting soot particles (PU)/ash/KC mixtures, the negative effect of ash on KC catalytic soot oxidation is relatively weak. The addition of ash makes the active site areas between PU and KC catalyst lose contact without changing the physicochemical properties of the catalyst. By contrast, the ash aging deposition on KC at 400 °C has an obviously negative effect on the soot combustion catalyzed by KC, because ash aging deposition leads to enormous changes in the chemical properties and catalytic activity of KC. This finding is consistent with characterization analyses such as XRD , SEM, XPS and Raman. Ash aging deposition destroys the KC structure and reduces the activity of KC to catalyze soot oxidation, and CaSO 4 has the greatest effect on the oxidation activity. Consequently, ash aging deposition causes structural property damage of as-prepared catalysts, leading to the failure of CDPF catalytic layer. This study provides a new idea for the selection and optimization strategy of catalysts in CDPF.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2025
·
IF 3.1
Fang Jia,Xu Xilong,Yang Yi,Han Zhiqiang,Zuo Zinong,Han Weiqiang,Lin Bin
Effective removal of soot deposited in diesel particulate filter by catalysts has attracted great attention in the aftertreatment field to achieve environment protection, but the problem is short by incomplete and poor soot combustion. Herein, an integrated ZnO–SnO 2 semiconductor n–n heterostructure strategy of catalysts and ash is proposed for promoting diesel soot combustion. The integrated effects of different catalysts and ZnO ash on soot oxidation are studied with thermogravimetric analysis and gas emission analysis. The diesel soot is simulated by Printex U (PU) particles, and the catalysts include SnO 2 , ZrO 2 , TiO 2 , CeO 2 and Pt/Al 2 O 3 nanoparticles. Compared with other catalysts, the best catalytic effect on soot oxidation is achieved when SnO 2 catalyst is mixed with PU/ZnO at 1:1:1 mass ratio in tight contact method. The S and R w indexes reach the largest values of 9.33 × 10 –8 % 2 min −2 ℃ −3 and 38.64 × 10 5 , and the CO 2 amount reaches the maximum value at 3462 ppm, which is correspondingly with the XRD and XPS spectrum results of PU/ZnO/SnO 2 with ZnO–SnO 2 heterojunction structure having more adsorbed oxygen. The excessive catalyst is negative to the heat and oxygen transfer among the nanoparticles. When the mass ratio of PU/ZnO/SnO 2 is 1:1:1, the soot combustion presents the comparatively superior state. The results of this study innovate the soot oxidation influenced by catalyst and ash, which benefits the optimization of passive regeneration strategy in DPF application.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
WASTE MANAGEMENT
·
2020
·
IF 5.448
Juan Luo,Junhao Lin,Rui Ma,Xing Chen,Shichang Sun,Peixin Zhang,Xiangli Liu
To study the effects of different ash/organics and C/H/O ratios on bio-fuel characteristics and energy efficiency, four kinds of sludge with different properties were used for microwave pyrolysis (800 °C). Moreover, the microwave pyrolysis reaction mechanisms of different sludge were also explored. The results showed that high-ash sludge could accelerate the frequency of polar molecule rotation in the microwave field due to the presence of oxides with dielectric properties in ash, thereby achieving faster heating rates and higher temperatures. However, compared with high-organic sludge, high-ash sludge exhibited lower bio-gas yield and higher bio-char yield. As the H/C ratio increased from 0.127 to 0.148, the bio-gas yield increased from 15.41% to 40.01%, and the content of H 2 in bio-gas and aliphatics in bio-oil increased to 36.69 vol% and 26.54 wt%, respectively. When the O/C ratio was reduced to 1.31, the content of CO and oxygenated compound in bio-oil increased to 31.25 vol% and 40.04 wt%, which lowered the quality of the bio-oil. Those consequences also determined that a mixture of sludge with different ash/organic ratios could be pyrolyzed to obtain high-quality bio-fuels and high energy efficiency. Differences in C/H/O ratios in the mixed sludge greatly affected the microwave pyrolysis heating process, which affected the pyrolysis reactions and the quality of the bio-fuels. Therefore, this study provides a theoretical basis to elevate the quality of bio-fuels and reduce microwave pyrolysis costs.
研究领域:
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2022
·
IF 7.425
Qingqing Yu,Zhiyu Xiong,Tong Shi,Li Yuan,Yulong Bao,Ruichang Gao
In order to elucidate the gelling mechanism of Premna microphylla turcz (PMT) induced by plant ash (PA), PA was fractionated into supernatant (PA-S) and precipitation (PA-P) and added to the PMT suspension, respectively. The effects of different concentrations (1–9%) and fractions (PA, PA-S, PA-P) of PA suspension on the gel properties were studied. Results showed that the electrical conductivity, content of monovalent cations, pH were higher in PA-S than PA-P. Both the PA-S and PA-P fractions induced the gelation of PMT (except for the low concentration at 1% for PA-S), and the PA-P-PMT gels showed much higher gel strength and hardness than PA-S-PMT gels. With increased concentration, the gel strength increased in PA-P-PMT, but decreased in PA-S-PMT. A hypothesis for the gelation of PMT induced by PA was proposed: the divalent cations in PA bind to carboxyl group in pectin and form gels; when higher content of PA is added, a higher pH leads to extensive dissociation of carboxyl groups thereby increases the electrostatic repulsion between pectin chains, which ultimately weakens the gelling forces. This study can provide theoretical support for further optimization of the traditional processing of PMT gels.
研究领域:
食品科学
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2024
·
IF 4.7
Hui-chuan REN,Xiao-bo MIN,Yong KE,Long-gong XIA,Yun-yan WANG,Cong PENG,Yun LI,Rong-he TAN,Chuan-fu ZHANG
A method to upgrade the iron grade in copper slag was proposed using lime to decompose Al 2 O 3 -containing fayalite melt (AFMT). Thermodynamic calculations indicated that adjusting the CaO/AFMT ratio can yield a residual melt with a FeO concentration of 75-88 wt.% and produce Ca 2 SiO 4 . In-situ observations suggested that the reaction was impeded in some way. Quenching experiments revealed that the initial reaction products consisted of calcium ferrite compounds and FeO-CaO melt. At the FeO-CaO melt/AFMT interface, Ca 2 SiO 4 particles precipitated, forming a dense Ca 2 SiO 4 film that significantly impeded mass transfer. Although trace amounts of Al 2 O 3 in AFMT temporarily enhanced mass transfer, they were insufficient to overcome this retardation effect. The decomposition reaction was far from achieving equilibrium, demonstrating a self-retardation effect. Measures must be implemented to eliminate this self-retardation effect and enhance the efficiency of reaction kinetics.
研究领域:
冶金工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 55
·33436-33443
·
IF 3.119
Qian Zhang,Jia Fang,Zhongwei Meng,Chen Chen,Zihan Qin
Soot (Printex U, PU) combustion in the presence of ash and soluble organic fraction (SOF) was studied by thermogravimetric analysis (TGA). The comprehensive combustion index, combustion stability index and peak temperature were collected to evaluate the combustion performance of soot/ash/SOF mixtures. Compared with SiO2, Fe2O3 and CaSO4 nanoparticles, ZnO nanoparticles efficiently accelerate soot combustion with excellent oxygen carrying abilities. When the weight ratio of the PU/ZnO mixture is 1 : 1, this acceleration effect is maximized in the soot combustion process. The comprehensive combustion and combustion stability indices increase from 0.667 × 10−7%2 min−2 °C−3 and 23.53 × 105 to 1.296 × 10−7%2 min−2 °C−3 and 39.53 × 105, compared to pure PU, respectively. Compared with the PU/ZnO mixture, the soot combustion had inferior results after adding two oils as the simulative SOF. The 15W lubricant had the minimum negative impact compared to 0# diesel fuel. The comprehensive combustion and combustion stability indices reach the maximum values of 1.074 × 10−7%2 min−2 °C−3 and 33.29 × 105 at the 1 : 1 : 0.1 weight ratio of PU/ZnO/15W, which grew by 62% and 42% compared to pure PU, respectively. This work contributes to an understanding of the combined effect of ash and SOF on soot combustion.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）