scholarly journals Co3O4/g-C3N4 Hybrids for Gas-Phase Hg0 Removal at Low Temperature

Processes ◽  
2019 ◽  
Vol 7 (5) ◽  
pp. 279 ◽  
Author(s):  
Zhen Zhang ◽  
Jiang Wu ◽  
Dongjing Liu
Keyword(s):  
Electron Transfer ◽  
Low Temperature ◽  
Gas Phase ◽  
Cobalt Oxide ◽  
Cooperative Effect ◽  
Side Reactions ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Interfacial Contact ◽  
Mercury Capture

The Co3O4/g-C3N4 hybrids are constructed via the incipient wetness impregnation method by depositing Co3O4 onto the exterior of g-C3N4, and then employed for Hg0 capture within 60–240 °C. The results show that the Co3O4/g-C3N4 hybrid with a Co3O4 content of 12 wt% performs optimally with the highest Hg0 removal efficiency of ~100% at or above 120 °C. The high performances of the Co3O4/g-C3N4 hybrids are probably attributed to the tight interfacial contact between Co3O4 and g-C3N4, with its improved electron transfer, inferring that cobalt oxide and g-C3N4 display a cooperative effect towards Hg0 removal. NO and SO2 shows a significant suppressive influence on the mercury capture performance, plausibly owing to the competing adsorption and side reactions.

scholarly journals The Influence of Ce or Mn Doping on Cu-Based Catalysts for De-NOx with NH3-SCR

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Lei Jiang ◽  
Yixi Cai ◽  
Miaomiao Jin ◽  
Zengzan Zhu ◽  
Yinhuan Wang
Keyword(s):  
Low Temperature ◽  
Physicochemical Properties ◽  
Topological Structure ◽  
Zeolite Catalysts ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Performance Tests ◽  
Nh3 Scr ◽  
Temperature Window ◽  
Different Doses

In this study, the de-NOx performance of Cu-based zeolite catalysts supported on topological structure (SSZ-13, BEA, ZSM-5) and loaded with different doses of copper (from 2 to 6 wt.%) was investigated. The preparation of copper-based catalysts adopted the incipient wetness impregnation method. To analyze the physicochemical properties of the catalysts, advanced techniques like BET, XRD, NH3-TPD, H2-TPR, and DRS UV-Vis were used. The performance tests suggested the 4Cu/SSZ-13 catalyst exhibited higher low-temperature activity and wider temperature window. Furthermore, compared with Mn-Cu/SSZ-13, the Ce-Cu/SSZ-13 catalysts exhibited better de-NOx performance.

Ordered Mesoporous Carbon/Cobalt Oxide Composites as the Electrode Materials for Supercapacitor

2011 ◽  
Vol 239-242 ◽  
pp. 1026-1029 ◽  
Author(s):  
Jing Li Xu ◽  
Ping Liu ◽  
Yang Lu ◽  
Jia Chang Zhao ◽  
Ji Cheng Feng ◽  
...  
Keyword(s):  
Cobalt Oxide ◽  
Mesoporous Carbon ◽  
Electrode Materials ◽  
Ordered Mesoporous Carbon ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Ordered Mesoporous ◽  
Scan Rate ◽  
Loading Amount ◽  
Oxide Composites

A series of ordered mesoporous carbon/cobalt oxide composites as electrode materials for supercapacitor were prepared via incipient wetness impregnation method. The results show that the structure and electrochemical properties of the composites depend mainly on the cobalt oxide loading amount in the ordered mesoporous carbon. The optimum loading amount of cobalt oxide is found to be 30 wt.%, and the composite derived from which exhibits 283.52 F/g of specific capacitance at the scan rate of 5 mV/s. The specific capacitances of which are higher than that of OMC and pure Co3O4 at every given scan rate, showing good synergetic effect.

scholarly journals PREPARASI KARBON TEREMBAN OKSIDA COBALT DARI LIMBAH KULIT MANGGIS SEBAGAI ADSORBEN PENJERAP ETILEN UNTUK PENGAWETAN BUAH

REAKTOR ◽  
2015 ◽  
Vol 15 (3) ◽  
pp. 165 ◽  
Author(s):  
Nur Indah Fajar Mukti ◽  
Imam Prasetyo ◽  
Aswati Mindaryani
Keyword(s):  
Shelf Life ◽  
Cobalt Oxide ◽  
Silica Gel ◽  
Pore Network ◽  
Carbon Surface ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Banana Fruit ◽  
Incipient Wetness ◽  
Fruit Preservation

Ethylene is a compound produced naturally by fruit that can accelerate the maturity of the fruit. Controlling ethylene gas as a product of metabolism of fruit during storage will prolong the shelf life of the fruit. Controlling ethylene gas is carried out by adsorption process using carbon-impregnated cobalt oxide. In this study, carbon as a support made by pyrolysis of extraction waste of mangosteen peel at a temperature of  850°C for 15 minutes. Furthermore, the process of impregnating of cobalt oxide into the carbon pore network was carried out by using the incipient wetness impregnation method by adding a cobalt salt solution into the carbon pore network,  followed by heating at a temperature of 110oC for 8 hours and calcination at a temperature of 200oC for 6 hours. Ethylene adsorption test performed at 30°C using a static volumetric test. While Cavendish banana fruit preservation process was carried out at ambient temperature (20-32oC) by observing the changing of skin color from day to day. Adsorption test results showed that the ethylene uptake increased with the increasing of the composition of cobalt oxide on the carbon surface. The highest ethylene uptake of 6.094 mmol/(gram of adsorbent) was obtained from adsorption of ethylene using carbon-impregnated 30% cobalt oxide. Fruit preservation process indicated that the increasing of amount of adsorbent can improve the shelf life of bananas Cavendish. The highest result was obtained from the addition of 15 grams of carbon-impregnated cobalt oxide and silica gel that can extend the shelf life of bananas Cavendish for 15 days.   Keywords: adsorption; carbon;  cobalt oxide;  ethylene; impregnation Abstrak Etilen merupakan senyawa yang dihasilkan secara alami oleh buah yang dapat mempercepat kematangan pada buah. Pengontrolan gas etilen sebagai produk metabolisme buah selama penyimpanan akan memperpanjang masa simpan buah tersebut. Pengontrolan gas etilen dilakukan dengan proses adsorpsi menggunakan karbon teremban oksida cobalt. Pada penelitian ini, karbon sebagai pengemban dibuat dari pirolisis limbah kulit manggis sisa ekstraksi pada suhu 850oC selama 15 menit. Selanjutnya, proses pengembanan oksida cobalt pada permukaan karbon dibuat melalui proses impregnasi dengan incipient wetness method yang dilakukan dengan menambahkan larutan garam cobalt ke dalam jaringan pori karbon yang dilanjutkan dengan pemanasan pada suhu 110oC selama 8 jam dan kalsinasi pada suhu 200oC selama 6 jam. Uji adsorpsi etilen dilakukan pada suhu 30oC menggunakan alat uji static volumetric. Sedangkan proses pengawetan buah pisang Cavendish dilakukan pada suhu lingkungan (20 – 32oC) dengan mengamati perubahan warna kulitnya dari hari ke hari. Hasil uji adsorpsi menunjukkan bahwa semakin banyak komposisi oksida cobalt pada permukaan karbon akan meningkatkan kapasitas penjerapan terhadap etilen. Hasil tertinggi sebesar 6,094 mmol/(gram adsorben) diperoleh dari adsorpsi etilen menggunakan karbon teremban 30% oksida cobalt. Dari proses pengawetan buah menunjukkan bahwa jumlah karbon teremban oksida cobalt yang semakin meningkat dapat meningkatkan umur simpan dari buah pisang Cavendish. Hasil tertinggi diperoleh dari penambahan 15 gram karbon teremban cobalt dan silica gel dapat memperpanjang umur simpan buah pisang Cavendish selama 15 hari. Kata kunci: adsorpsi; karbon; oksida cobalt; etilen; impregnasi

scholarly journals Preparation and Characterization of Ni/ZrTiAlOx Catalyst via Sol-Gel and Impregnation Methods for Low Temperature Dry Reforming of Methane

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1335
Author(s):  
Seol A Shin ◽  
Ali Alizadeh Eslami ◽  
Young Su Noh ◽  
Hyun-tae Song ◽  
Hyun Dong Kim ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Sol Gel ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Ternary Metal ◽  
Inhibition Property ◽  
Diffuse Reflectance Infrared

Recently, the dry reforming of methane (DRM) has received much attention as a conversion technology of greenhouse gases. Ni-based catalysts supported on ternary metal oxide composite (ZrTiAlOx) were prepared to improve the coke resistance properties in the DRM (CH4:CO2 = 1) at low temperature. The ZrTiAlOx supports with different ratios of Zr/Ti were prepared through the modified Pechini sol-gel method, and then the Ni was impregnated on the synthesized support via the incipient wetness impregnation method. Considering the Zr/Ti ratios, different catalytic activity and durability in the DRM were identified. The Ni/ZrTiAlOx catalyst with Zr/Ti of 2 exhibited enhanced coke inhibition property compared to the others at low temperature DRM for 50 h. The catalysts with a high Zr/Ti ratio under the same condition were rapidly deactivated, while the catalyst with a low Zr/Ti ratio showed deficient activity. It was found from temperature-programmed surface reactions (TPSR) and DRIFTS (Diffuse Reflectance Infrared Fourier Transform Spectroscopy) analysis that the addition of Ti has led in to higher catalytic stability at Zr/Ti = 2, which could be as a result of oxygen vacancies generated by the ternary metal oxides. Ni/ZrTiAlOx catalyst with ratio of Zr/Ti = 2 showed high stability and good catalytic activity towards DRM for the production of syngas.

scholarly journals Study on Low-Temperature Catalytic Dehydrogenation Reaction of Tail Chlorine by Pd/Al2O3

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Hanhan Wang ◽  
Tingting Lu ◽  
Yuna Li ◽  
Bo Wu ◽  
Jianwei Xue ◽  
...  
Keyword(s):  
Low Temperature ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Incipient Wetness Impregnation ◽  
Catalytic Dehydrogenation ◽  
Impregnation Method ◽  
Pd Catalysts ◽  
Dehydrogenation Reaction ◽  
Loading Amount ◽  
Oxygen Reaction

The catalytic dehydrogenation reaction of tail chlorine by Pd was studied using a fixed-bed reactor at low temperature from 30 to 100°C. Different catalyst supports such as SiO2 and Al2O3 were applied to prepare Pd catalysts by the incipient-wetness impregnation method. And the catalysts were characterized by XRD, FTIR, XPS, SEM, and N2 adsorption-desorption. The catalyst Pd loading on both SiO2 and Al2O3 had a catalytic effect on the dehydrogenation reaction, but the carrier Al2O3 was more superior. The hydrogen conversion and selectivity of hydrogen-oxygen reaction increased first and then decreased with Pd loading amount and temperature by using Pd/Al2O3 as catalysts, but the influence of temperature was limited when it was higher than 60°C. The hydrogen conversion was 97.38% and selectivity of hydrogen-oxygen reaction was 79% when the reaction temperature was at 60°C with 1 wt.% Pd/Al2O3.

scholarly journals Allyl Alcohol Production by Conversion of Glycerol Over Supported Iron and Nickel Bimetallic Oxides

2020 ◽  
Vol 64 (4) ◽  
Author(s):  
Nancy Martín ◽  
María de Lourdes Rodríguez ◽  
Margarita Viniegra ◽  
Dora Solis-Casados
Keyword(s):  
Gas Phase ◽  
Allyl Alcohol ◽  
Oxide Catalysts ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Iron Species ◽  
N2 Adsorption ◽  
Alcohol Production ◽  
Reduction Of Iron ◽  
Iron Nickel

Abstract. The study of catalysts based on iron, nickel, and iron-nickel oxides (Fe, Ni and FeNi) supported on a commercial mesoporous alumina is presented. The metal oxides were synthesized by the incipient wetness impregnation method. The samples were characterized by XRD, TPR-H2, Raman spectroscopy, XPS and N2 adsorption. The catalytic activity was evaluated in the dehydration-dehydrogenation reaction of glycerol in the gas phase. In the iron oxide and nickel oxide catalysts, the result of TPR-H2 showed that the presence of nickel influences the reduction of iron species. In the reaction, the catalysts showed similar conversion. However, the selectivity of the bimetallic oxide catalysts is modified, and the production of allyl alcohol increases noticeably forming a greater amount allyl alcohol than that observed in the monometallic oxides, in which a greater amount of hydroxyacetone is formed. The results indicate that the redox pairs Fe+3/Fe+2 influence the selectivity of these oxides. A decrease in the ratio Fe+3/Fe+2 species favored the formation of allyl alcohol.   Resumen. Se presenta el estudio de catalizadores basados en óxidos de hierro y níquel (Fe, Ni y FeNi) soportados en una alúmina mesoporosa comercial. Los óxidos metálicos se sintetizaron por el método de impregnación de humedad incipiente. Las muestras se caracterizaron por XRD, TPR-H2, espectroscopía Raman, XPS y adsorción de N2. La actividad catalítica se evaluó en la reacción de deshidratación-deshidrogenación de glicerol en la fase gaseosa. En los catalizadores de óxido de hierro y óxido de níquel, el resultado de TPR-H2 mostró que la presencia de níquel influye en la reducción de las especies de hierro. En la reacción, los catalizadores mostraron una conversión similar. Sin embargo, la selectividad en los catalizadores de óxidos bimetálicos se modifica formando una mayor cantidad de alcohol alílico que la observada en los óxidos monometálicos, donde se forma una mayor cantidad de hidroxiacetona. Los resultados obtenidos indican que los pares redox Fe+2/Fe+3 influyen en el comportamiento catalítico de estos óxidos, en la selectividad. Una disminución de la relación Fe+3/Fe+2 favorece la formación de alcohol alílico.

scholarly journals Surface Structure and Catalytic Performance of Ni-Fe Catalyst for Low-Temperature CO Hydrogenation

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Fanhui Meng ◽  
Pengzhan Zhong ◽  
Zhong Li ◽  
Xiaoxi Cui ◽  
Huayan Zheng
Keyword(s):  
Low Temperature ◽  
Iron Content ◽  
Co Hydrogenation ◽  
Catalytic Performance ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Synthetic Natural Gas ◽  
Fe Catalyst ◽  
Ni Species ◽  
Shift Reaction

Catalysts 16NixFe/Al2O3(xis 0, 1, 2, 4, 6, 8) were prepared by incipient wetness impregnation method and the catalytic performance for the production of synthetic natural gas (SNG) from CO hydrogenation in slurry-bed reactor were studied. The catalysts were characterized by BET, XRD, UV-Vis DRS, H2-TPR, CO-TPD, and XPS, and the results showed that the introduction of iron improved the dispersion of Ni species, weakened the interaction between Ni species and support and decreased the reduction temperature and that catalyst formed Ni-Fe alloy when the content of iron exceeded 2%. Experimental results revealed that the addition of iron to the catalyst can effectively improve the catalytic performance of low-temperature CO methanation. Catalyst 16Ni4Fe/Al2O3with the iron content of 4% exhibited the best catalytic performance, the conversion of CO and the yield of CH4reached 97.2% and 84.9%, respectively, and the high catalytic performance of Ni-Fe catalyst was related to the property of formed Ni-Fe alloy. Further increase of iron content led to enhancing the water gas shift reaction.

scholarly journals Insight into the Promoting Role of Er Modification on SO2 Resistance for NH3-SCR at Low Temperature over FeMn/TiO2 Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 618
Author(s):  
Huan Du ◽  
Zhitao Han ◽  
Xitian Wu ◽  
Chenglong Li ◽  
Yu Gao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalyst Surface ◽  
Impregnation Method ◽  
In Situ Drifts ◽  
Tio2 Catalyst ◽  
Nh3 Scr ◽  
Nh3 Adsorption ◽  
So2 Resistance ◽  
Fast Scr

Er-modified FeMn/TiO2 catalysts were prepared through the wet impregnation method, and their NH3-SCR activities were tested. The results showed that Er modification could obviously promote SO2 resistance of FeMn/TiO2 catalysts at a low temperature. The promoting effect and mechanism were explored in detail using various techniques, such as BET, XRD, H2-TPR, XPS, TG, and in-situ DRIFTS. The characterization results indicated that Er modification on FeMn/TiO2 catalysts could increase the Mn4+ concentration and surface chemisorbed labile oxygen ratio, which was favorable for NO oxidation to NO2, further accelerating low-temperature SCR activity through the “fast SCR” reaction. As fast SCR reaction could accelerate the consumption of adsorbed NH3 species, it would benefit to restrain the competitive adsorption of SO2 and limit the reaction between adsorbed SO2 and NH3 species. XPS results indicated that ammonium sulfates and Mn sulfates formed were found on Er-modified FeMn/TiO2 catalyst surface seemed much less than those on FeMn/TiO2 catalyst surface, suggested that Er modification was helpful for reducing the generation or deposition of sulfate salts on the catalyst surface. According to in-situ DRIFTS the results of, the presence of SO2 in feeding gas imposed a stronger impact on the NO adsorption than NH3 adsorption on Lewis acid sites of Er-modified FeMn/TiO2 catalysts, gradually making NH3-SCR reaction to proceed in E–R mechanism rather than L–H mechanism. DRIFTS.

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