Ethylene Hydrogenation over Platinum Nanoparticle Array Model Catalysts Fabricated by Electron Beam Lithography:  Determination of Active Metal Surface Area

2002 ◽  
Vol 106 (44) ◽  
pp. 11463-11468 ◽  
Author(s):  
Jeff Grunes ◽  
Ji Zhu ◽  
Erik A. Anderson ◽  
Gabor A. Somorjai
Keyword(s):  
Electron Beam ◽  
Surface Area ◽  
Metal Surface ◽  
Electron Beam Lithography ◽  
Nanoparticle Array ◽  
Ethylene Hydrogenation ◽  
Platinum Nanoparticle ◽  
Metal Surface Area ◽  
Active Metal

COH2 titration for the determination of super small metal surface area

1989 ◽  
Vol 120 (2) ◽  
pp. 370-376 ◽  
Author(s):  
Shin'ichi Komai ◽  
Tadashi Hattori ◽  
Yuichi Murakami
Keyword(s):  
Surface Area ◽  
Metal Surface ◽  
Metal Surface Area

CuCr2O4 derived by the sol–gel method as a highly active and selective catalyst for the conversion of glycerol to 2,6-dimethylpyrazine: a benign and eco-friendly process

2017 ◽  
Vol 7 (15) ◽  
pp. 3399-3407 ◽  
Author(s):  
Krishna Vankudoth ◽  
Naresh Gutta ◽  
Vijay Kumar Velisoju ◽  
Suresh Mutyala ◽  
Hari Padmasri Aytam ◽  
...  
Keyword(s):  
Surface Area ◽  
Metal Surface ◽  
Sol Gel ◽  
Selective Catalyst ◽  
Gel Method ◽  
Sol Gel Method ◽  
Basic Sites ◽  
Metal Surface Area ◽  
Highly Active

A direct correlation between Cu metal surface area and surface basic sites of CuCr2O4 and the 2,6-dimethylpyrazine rate is established.

Reply to the comment by Bailey and Waugh on the use of temperature programmed desorption of H2 to determine metal surface area of Cu catalysts

1993 ◽  
Vol 17 (3-4) ◽  
pp. 375-376 ◽  
Author(s):  
Martin Muhler ◽  
Lars P. Nielsen ◽  
Eric Törnqvist ◽  
Bjerne S. Clausen ◽  
Henrik Topsøe
Keyword(s):  
Surface Area ◽  
Metal Surface ◽  
Temperature Programmed Desorption ◽  
Metal Surface Area ◽  
Cu Catalysts ◽  
Temperature Programmed

Grating Coupled Waveguide Biosensor Based on Porous Silicon

2011 ◽  
Vol 1301 ◽  
Author(s):  
Xing Wei ◽  
Sharon M. Weiss
Keyword(s):  
Electron Beam ◽  
Porous Silicon ◽  
Nucleic Acids ◽  
Surface Area ◽  
Small Molecule ◽  
Electron Beam Lithography ◽  
Low Cost ◽  
Grating Couplers ◽  
Silicon Waveguides ◽  
A New Technique

ABSTRACTPorous silicon waveguides with integrated porous silicon grating couplers are demonstrated as small molecule biosensors. Two fabrication methods are presented for the grating couplers: standard electron beam lithography with reactive ion etching and a new technique based on direct imprinting of porous substrates. Although the gratings fabricated using standard lithographic techniques have steeper sidewalls and enable a larger available sensing surface area inside the waveguide, the imprinted gratings have the advantage of rapid and low-cost fabrication. Both the lithographically and imprinted sensors are shown to have waveguide losses on the order of 10 dB/cm, and both are demonstrated for detection of 16mer nucleic acids.

scholarly journals Characterization and performance of W-ZSM-5 and loaded Cu/ZsM-5 catalysts

2018 ◽  
Vol 4 (1) ◽  
pp. 137
Author(s):  
Didi Dwi Anggoro ◽  
Nor Aishah Saidina Amin
Keyword(s):  
Metal Oxides ◽  
Surface Area ◽  
Methane Oxidation ◽  
Metal Surface ◽  
Reaction Temperature ◽  
Methane Conversion ◽  
Liquid Hydrocarbons ◽  
Olefin Oxidation ◽  
Metal Surface Area ◽  
And Performance

The metal oxides with sufficiently high dehydrogenation and low olefin oxidation activities reduces the acidity of ZSM-5. As a result, the metal containing ZSM-5 can produce higher hydrocarbons in methane oxidation. Many researchers studied the applicability of HZSM-5 and modify ZSM-5 to methane conversion to liquid hydrocarbons but result of their research still lead to low conversion and selectivity. The modified HZS-5 by loading with Tungsten (W) enhanced its heat resistant performance, and the high reaction temperature (800ºC) did not lead to the loss of W component by sublimation. The loading of HZSM-5 with Tungsten and Cooper (Cu) resulted in an increment in the methane conversion, CO2 and C5+ selectivities. In contrast, CO, C2-3, and H2O selectivities were reduced. The process to convert methane to liquid hydrocarbons (C5+) was dependent on the metal surface area and the acidity of zeolite. The high methane conversion and C5+ selectivity, and low H2O selectivity are obtained by using W/3.0Cu/HZSM-5.  Keywords : Characterization W-ZSM-5, Modified HZSM-5, Tungsten, Copper, Methane  Abstrak  Logam oksida dengan kemampuan dehidrogenasi yang tinggi dan aktifasi oksidasi olefin berkurang dengan sifat keasaman dari ZSM-5. Sebagai hasilnya, ZSM-5 yang mengandung logam dapat memproduksi hidrokarbon rantai panjang dari oksidasi gas metana. Telah banyak para peneliti mempelajari kemampuan HZSM-5 dan ZSM-5 yang telah dimodifikasi untuk mengubah gas metana menjadi hidrokarbon cair tetapi hasil konversi dan selektivitasnya masih rendah. Modifikasi HZSM- 5 dengan penambahan logam Tungsten (W) meningkatkan daya tahan panas dan pada reaksi suhu tinggi (800ºC) tidak menyebabkan hilangnya logam W dikarenakan proses sublimasi. Penambahan logam Tungsten dan Copper (Cu) menyebabkan meningkatnya konversi metana, selektifitas CO2 dan C5+ Sebaliknya, selektifitas CO,C2-3, dan H2O menurun. Proses konversi metana menjadi hidrokarbon cair ditentukan oleh luas permukaan logam dan sifat keasaman dari zeolite.  Penggunaan katalis W/3.0Cu/HZSM-5 menghasilkan konversi metana dan selektifitas C5+ tinggi dan selektifitas H2O rendah.  Kata kunci : Karakterisasi W-ZSM-5, Modifikasi HZSM-5, Tungsten, Copper, Metana

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