CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Jingang Wang,Jianbo Zhang,Cheng Xing,Taosheng Jin,Jinpeng Liu,Meiting Ju,Xuejiao Tang
Phosphorus (P) poisoning of NH 3 -SCR catalysts is inevitable in application of NO x abatement of diesel exhaust. The distinct effects on Cu-SSZ-13 of P from different precursors (H 3 PO 4 and (NH 4 ) 2 HPO 4 ) were figured out and the mechanism was further investigated. P-poisoned Cu-SSZ-13 (Si/Al = 6) catalysts were prepared and characterized using N 2 adsorption, X-ray powder diffraction (XRD), scanning electron microscope with energy-dispersive X-ray spectroscopy mapping (SEM-EDX), ammonia temperature-programmed desorption (NH 3 -TPD), X-ray photoelectron spectroscopy (XPS), hydrogen temperature programmed reduction (H 2 -TPR), electron paramagnetic resonance (EPR) and 27 Al solid-state magic angle spinning nuclear magnetic resonance spectroscopies ( 27 Al NMR). Significant enhancement of high-temperature activities (400–600 °C) were observed for the catalysts with P loading of 0.3–0.9 wt%, since the appropriate incorporation enabled to bind P atoms to CuO x in remained framework. However, the high P content of 1.5 wt% resulted in a detrimental effect on framework to induce the accumulation of Cu species. Interestingly, the dominant P from H 3 PO 4 was inclined to directly attack the framework Al leading to more severe dealumination, while the P from (NH 4 ) 2 HPO 4 interacted with Cu 2+ to form copper phosphate with more Cu 2+ migrating to the surface of the catalyst which promoted the NO x conversation at each active site resulting in the low-temperature catalytic activity unchanged. So, control of the P/Cu and form of P is capable of preventing P poisoning and unlocks the potential of Cu-SSZ-13 in exhaust treatment.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yuan Zhong,Yue Zhou,Cheng Zhou,Hongxi Chen,Zhi Zhou,M.G. Brik,Mao Xia
Greenhouse plant cultivation (GPC) has attracted great attention in recent years, and the search for novel high efficiency far-red emitting phosphor is a crucial task. With this aim in view, in the present paper Ca 14 Al 10 Zn 6 O 35 :Mn 4+ (CAZO:Mn 4+ ) was investigated as a prototype phosphor. By simply incorporating excessive amount of Al, CA 10.25 ZO:Mn 4+ can meet two criteria simultaneously: it has relatively high quantum efficiency (QE) and good thermal stability, which tackle the goal of “killing two birds with one stone”. The internal QE (IQE) could further enhance from 83.9% to 90.0% due to the increased occupancy capability of Mn 4+ in [AlO 6 ] octahedron, which is evidenced by solid-state 27 Al nuclear magnetic resonance (NMR) and energy dispersive spectra (EDS) measurements. In addition, the Mn 4+ concentration-dependent excitation and emission spectra also demonstrate that the optimal doping concentration of Mn 4+ in CA 10.25 ZO host increases from 0.15 to 0.17 mol. Moreover, compared with CA 9.85 ZO:0.15Mn 4+ , the thermal stability of CA 10.25 ZO:0.15Mn 4+ improves from 55% to 58% at 150 °C and 38%–45% at 200 °C, respectively. The as-fabricated plant growth LED devices shows better potential to be applied in GPC. This design strategy shown here provides an alternative pathway to further improve the luminescence properties of phosphors.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
FUEL
·
2023
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IF 7.4
Jie Tuo,Jilong Wang,Xianchen Gong,Chengwei Zhai,Hao Xu,Teng Xue,Jingang Jiang,Yejun Guan,Peng Wu
Enriching Al atoms in T2 and T4 sites of FER zeolite is decisive for achieving high catalytic activity in the carbonylation reaction of dimethyl ether (DME). Regulating the spatial position of Al atoms in targeted framework sites remains to be a great challenge during the synthesis of FER zeolite. The FER nanosheets with preferential Al-sitting in T2 and T4 sites were successfully synthesized with the assistance of cetyltrimethylammonium bromide (CTAB). The effect of CTAB on the morphology and Al distribution has been investigated in detail. CTAB mostly adsorbed on external surface serving as growth inhibitors, which resulted in nanosheet morphology and changed the length ratio along the b -axis to c -axis of the crystals. A minor portion of CTAB located in the channels may favor the spatial Al location in T2 and T4 sites, indicated by the results from 27 Al MAS NMR spectra. The FER nanosheets exhibited improved DME conversion, stability, space–time yield (STY), and lifetime compared to conventional FER in DME carbonylation reaction.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Jian Wang,Yueyang Xu,Erjian Huang,Liming Kong,Jie Li,Yongping Zeng
The combustion of thiophene sulfides in fuel leads to the release of sulfur oxides (SO x ), which pose significant threats to both ecological systems and human health. Adsorption desulfurization has gained considerable attention from researchers due to its mild operating conditions, low production costs, and minimal impact on octane number. This study investigates the use of Cu-BTC as a platform for developing a novel adsorbent aimed at efficiently removing thiophenic compounds from fuel. Aluminum atoms were incorporated into the framework of Cu-BTC to create micro/mesoporous Al/Cu-BTC. Subsequently, the π-complexation adsorbent Al/Cu(I)-BTC, featuring Lewis acid sites, was synthesized through the in-situ reduction of Al/Cu-BTC using sodium thiosulfate. The adsorption properties of Al/Cu(I)-BTC for thiophene were assessed through both batch and breakthrough experiments. Al/Cu(I)-BTC-0.10(0.28) demonstrated exceptional adsorption performance. The static and dynamic adsorption capacities of thiophene at 500 and 200 ppm were 18.54 mg S/g and 9.49 mg S/g, respectively. Importantly, the adsorption capacity of Al/Cu(I)-BTC-0.10 (0.28) for thiophene in fuel containing 500 ppm sulfur remained at 15.45 mg S/g after six regeneration cycles. In the competitive adsorption of toluene, the adsorption capacity of the adsorbent for thiophene in the fuel containing 200 ppm sulfur was 7.84 mg S/g.
研究领域:
材料科学
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环境科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2025
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IF 8.2
Chun Li,Jiaxun Yao,Jiayi Xu,Huanhuan Yang,Guangfu Luo,Yanhao Yu
Nucleation behavior governs the selectivity of area-selective atomic layer deposition (AS-ALD). Ideally, nontargeted regions should exhibit delayed nucleation or sparse nucleation that can be easily removed by post-treatment. Here, we report a burst nucleation phenomenon during AS-ALD on perfluoroalkyl self-assembled monolayer (SAM)-treated surfaces. Burst nucleation results in discontinuous particle deposition with weak interfacial adhesion on nontargeted regions, in contrast to the progressive nucleation that forms uniform and adherent films on alkyl SAMs. These weakly adhered particles can be completely removed by gentle wiping without affecting the ALD film in targeted areas. The burst window depends on the SAM chain length, the ALD precursor, and the ALD temperature. When applied to Cu/SiO2 substrates, the nucleation control enables 99.9% selectivity after 30 cycles of Al2O3 ALD, while that of alkyl SAMs is 52.2%. The burst nucleation strategy is broadly effective for enhancing the selectivity of AS-ALD oxides (e.g., ZrO2, HfO2, ZnO) and polymers (e.g., polyimide).
研究领域:
材料科学
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纳米技术
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薄膜沉积
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表面化学
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半导体工艺
✓ 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）