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Efficient Pt/KFI zeolite catalysts for the selective catalytic reduction of NOxby hydrogen

Journal of Environmental Sciences 2024年第4期138卷 102-111页

作者： Ligang Zhang Yulong Shan Zidi Yan Zhongqi Liu Yunbo Yu Hong He School of Rare Earths University of Science and Technology of ChinaHefei 230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341119China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Aiming at purification of NO_(x)from hydrogen internal combustion engines(HICEs),the hydrogen selective catalytic reduction(H_(2)-SCR)reaction was investigated over a series of Pt/KFI zeolite catalysts.H_(2)can readily reduce NO_(x)to N_(2)and N_(2)O while O_(2)inhibited the deNO_(x)efficiency by consuming the reductant H_(2).The Pt/KFI zeolite catalysts with Pt loading below 0.1wt.% are optimized H_(2)-SCR catalysts due to its suitable operation temperature window since high Pt loading favors the H_(2)-O_(2)reaction which lead to the insufficient of reactants.Compared to metal Pt^(0)species,Pt^(δ+)species showed lower activation energy of H_(2)-SCR reaction and thought to be as reasonable active sites.Further,Eley-Rideal(E-R)reaction mechanism was proposed as evidenced by the reaction orders in kinetic studies.Last,the optimized reactor was designed with hybrid Pt/KFI catalysts with various Pt loading which achieve a high NO_(x)conversion in a wide temperature range.

关键词： Pt/KFI zeolite Pt loading H_(2)-SCR reaction conditions Kinetics studies

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Adjust the reaction conditions of enzyme catalysis to product fructooligosaccharides containing different components proportions

Adjust the reaction conditions of enzyme catalysis to produc...

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2010 First International Conference on Cellular,Molecular Biology, Biophysics and Bioengineering(CMBB 2010)

作者： Ding Jicheng Key Laboratory of Nutrition and Safety Ministry of Education Tianjin University of Science & Technology Tianjin China 300457Lv xiaoling Key Laboratory of Nutrition and Safety Ministry of Education Tianjin University of Science & Technology Tianjin China 300457

Fructooligosaccharides （FOSs）, as a mixture of 1-kestose, nystose, and 1F-fructofuranosylnystose oligosaccharides, exhibit lots of beneficial effects on our health and have been used as food ingredients. There have been a lot of reports on how to raise FOSs yield in different ways, but almost nobody did any deeply studies on the composition of FOSs—proportion of each component. However, different components may have different functions and some even show side-effects. In this research, we employed immobilized fructosyltransferase to produce FOSs and got a maximum yield of 56.12 %. Then we successfully produced FOSs of different components proportions by adjusting the reaction parameters—pH, temperature, and fermentation time. We designed six groups to investigate the relationship between reaction parameters and components proportions, and the results showed that pH condition mainly affects the yield while reaction time mainly affects components proportions. It is the first time that the components proportions of FOSs are systemically investigated, and we finally figured out six protocols for producing different FOSs. This is a basic investigation on the relationship between FOSs components proportions and reaction conditions. We hope this research can be helpful for other researchers who are interested in this area.

关键词： Fructooligosaccharides Components proportions reaction conditions Optimization

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Effect of reaction conditions on the Average Particle Size of Ferrous Oxalate

Effect of Reaction Conditions on the Average Particle Size o...

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加速功能材料自主创新，促进西部战略性新兴产业发展——2...

作者： Jian WU,Yaochun YAO National Engineering Laboratory for Vacuum Metallurgy,Kunming University of Science and Technology,KMUST,Kunming,China,650093

In this study,ferrous oxalate was prepared from ferrous sulfate and oxalic acid by precipitation reaction.The effect of the reaction conditions,such as reaction temperature,reaction time,reaction mode,laying-aside time,ball mill time and additive agents on the average particle size of ferrous oxalate was investigated.The optimal reaction conditions for the particle size of ferrous oxalate were obtained as follow:reac-tion temperature of 20℃,reaction time of 55min,reaction mode of ultrasound,laying-aside time of 30m in after titrating,ball mill time of 120min and adding ethanol absolute with the proportion of 3/4 in the dissolution of oxalic acid.Under these optimal conditions,the average particle size which represented by D50 of prepared sample could reach up to 3μm.

关键词： ferrous oxalate precipitation reaction particle size reaction conditions

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Effect of reaction conditions on the Purity of Ferrous Oxalate

Effect of Reaction Conditions on the Purity of Ferrous Oxala...

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加速功能材料自主创新，促进西部战略性新兴产业发展——2...

作者： Yaochun YAO,Jian WU National Engineering Laboratory for Vacuum Metallurgy,Kunming University of Science and Technology,KMUST,Kunming,China,650093

In this study,ferrous oxalate was prepared from ferrous sulfate and oxalic acid by precipitation reaction.The effect of the reaction conditions,such as reaction temperature,reaction time,reaction mode,laying-aside time,drying temperature and additive agent on the purity of ferrous oxalate was investigated.The optimal reaction conditions for the purity of ferrous oxalate were obtained as follow:reaction temperature of 60℃,reaction time of 55m in,reaction mode of ultrasound,laying-aside time of 30min after titrating,drying temperature of 120℃ without additive agent.Under these optimal conditions,the purity of prepared sample was 99.66%,containing PPM-grade impurities.

关键词： ferrous oxalate precipitation reaction purity reaction conditions

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Preparation of a highly efficient Pt/USY catalyst for hydrogenation and selective ring-opening reaction of tetralin

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Petroleum Science 2018年第3期15卷 605-612页

作者： Qi Wang Zhang-Gui Hou Bo Zhang Jian Liu Wei-Yu Song De-Sheng Xue Li-Zhi Liu Dong Wang Xin-Guo Chen State Key Laboratory of Heavy Oil Processing and Beijing Key Laboratory of Oil and Gas Pollution Control China University of Petroleum Beijing 102249 China CNOOC Research Institute of Oil and Petrochemicals Beijing 102249 China

Ultrastable Y zeolite（USY）-supported Pt catalyst was prepared by gas-bubbling-assisted membrane reduction. The influence of reaction conditions and the metal and acid sites of catalysts on the catalytic performance of catalyst in hydrogenation and selective ring opening of tetralin, 1,2,3,4-tetrahydronaphthalene（THN）, was studied. It was found that the optimal reaction conditions were at a temperature of 280 °C, hydrogen pressure of 4 MPa, liquid hourly space velocity of 2 h^-1 and H2/THN ratio of 750. Under these optimal conditions, a high conversion of almost 100% was achieved on the 0.3 Pt/USY catalyst. XRD patterns and TEM images revealed that Pt particles were highly dispersed on the USY, favorable to the hydrogenation reaction of tetralin. Ammonia temperature-programmed desorption and Py-IR results indicated that the introduction of Pt can reduce the acid sites of USY, particularly the strong acid sites of USY. Thus, the hydrocracking reaction can be suppressed.

关键词： Hydrogenation and selective ring opening reaction conditions Supported Pt catalyst Tetralin

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Optimization of ISSR-PCR System and conditions for Portulaca oleracea L.

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Agricultural Biotechnology 2017年第4期6卷 23-24,42页

作者： Zhaoyun WANG Dongchen NA Modern College of Arts and Sciences Shanxi Normal University Linfen 041000 China College of Life Sciences Shanxi Normal University Linfen 041000China

With Portulaca oleracea L. as an experimental material, its total DNA was extracted by the improved CTAB method, the ISSR-PCR primers were screened, and the ISSR-PCR reaction system and reaction conditions for P. oleracea were Optimized. The results showed that there were 8 primers suitable for ISSR-PCR of P. oleracea. The optimal reaction system had a volume of 25 μl, including 2 x Taq Platinum PCR Master Mix 12.5 μl, primer 2 μl, ddH20 9.5 μl, and DNA template 1μl. The optimized ISSR-PCR of P. oleracea was started with pre-denaturation at 94 ℃ for 360 s, followed by 30 cycles of denaturation at 94 ℃ for 60 s, annealing at 54 ℃ for 60 s and extension at 72 ℃ for 90 s, and completed by extension at 72 ℃ for 300 s.

关键词： Portulaca oleracea L. ISSR-PCR reaction system reaction conditions

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Catalytic Behavior and Synergistic Effect of Nonthermal Plasma and CuO/AC Catalyst for Benzene Destruction

Catalytic Behavior and Synergistic Effect of Nonthermal Plas...

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第十八届中国科协年会——分12大气雾霾及PM2.5...

作者： Lianfang CAO Chi HE Xiaohe LIU Department of Environmental Science and Engineering School of Energy and Power EngineeringXi’an Jiaotong University

Nonthermal plasma-catalysis hybrid technology(NTP-C) operated at ambient temperature and pressure offers an innovative and effective approach to solving the problem of dilute volatile organic compounds pollution. Herein, the destruction of benzene(50–450 ppm) over an in-plasma NTP-C composite system was investigated. The AO/active carbon(AO/AC), AO/A molecular sieve(AO/MS), and AO/γ-AlO(A = Fe, Ag, Zn, Mn, and Cu) catalysts were prepared by the incipient-wetness impregnation method. The destruction performances of NTP alone and NTP-C are compared under different reaction conditions, such as inlet reactant concentration, catalyst type, and energy density. AC exhibits the best benzene removal efficiency among three catalyst supports, and the performances of AO/AC under different conditions follow the trend of Cu O/AC > Mn O/AC > Mn O/AC > FeO/AC > AC > Zn O/AC > AgO/AC. The NTP with Cu O/AC system exhibits the highest benzene elimination capability with almost 90.6 % inlet benzene removed at energy density of 70 and 70 J L-1. The strong adsorption ability of AC and the optimal catalytic ability of crystalline structure of Cu O on the AC support may be contributed to the excellent performance of Cu O/AC. It is found that the NOx by-product also can be well controlled over NTP-Cu O/AC system. Additionally, the surface of Cu O/AC is more slipperier and homogeneous with the reaction proceeding, indicating higher stability of Cu O/AC.

关键词： Nonthermal plasma Benzene CuO/AC reaction conditions Synergistic effect

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