Promoting Effect of SO2 on Activated Carbon-Supported Vanadia Catalyst for NO Reduction by NH3 at Low Temperatures

1999 ◽  
Vol 187 (1) ◽  
pp. 245-248 ◽  
Author(s):  
Zhenping Zhu ◽  
Zhenyu Liu ◽  
Hongxian Niu ◽  
Shoujun Liu
Keyword(s):  
Activated Carbon ◽  
Low Temperatures ◽  
No Reduction ◽  
Promoting Effect ◽  
Vanadia Catalyst

NO reduction with NH3 over an activated carbon-supported copper oxide catalysts at low temperatures

2000 ◽  
Vol 26 (1) ◽  
pp. 25-35 ◽  
Author(s):  
Zhenping Zhu ◽  
Zhenyu Liu ◽  
Shoujun Liu ◽  
Hongxian Niu ◽  
Tiandon Hu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Copper Oxide ◽  
Low Temperatures ◽  
No Reduction ◽  
Oxide Catalysts

MnOx–CeO2/Activated Carbon Honeycomb Catalyst for Selective Catalytic Reduction of NO with NH3 at Low Temperatures

2012 ◽  
Vol 51 (36) ◽  
pp. 11667-11673 ◽  
Author(s):  
Yanli Wang ◽  
ChuanZhang Ge ◽  
Liang Zhan ◽  
Cui Li ◽  
Wenming Qiao ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Selective Catalytic Reduction ◽  
Low Temperatures ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Carbon Honeycomb

Capturing ability for COS gas by a strong bridge bonding of a pair of potassium anchored on carbonate of activated carbon at low temperatures

2019 ◽  
Vol 211 ◽  
pp. 421-429 ◽  
Author(s):  
Junyeong Kim ◽  
Jeong Yeon Do ◽  
Keepyung Nahm ◽  
No-Kuk Park ◽  
Junhwa Chi ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Low Temperatures

scholarly journals Electrical Promotion-Assisted Automotive Exhaust Catalyst: Highly Active and Selective NO Reduction to N2 at Low-Temperatures

2021 ◽  
Author(s):  
Yuki Omori ◽  
Ayaka Shigemoto ◽  
Kohei Sugihara ◽  
Takuma Higo ◽  
Toru Uenishi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Electric Field ◽  
Low Temperatures ◽  
No Reduction ◽  
Lattice Oxygen ◽  
Pd Catalyst ◽  
Highly Active ◽  
Automotive Exhaust Catalyst ◽  
Activated Surface

Pd catalyst (Pd/Ce<sub>0.7</sub>Zr<sub>0.3</sub>O<sub>2</sub>) in an electric field exhibits extremely high three-way catalytic activity (TWC: NO-C<sub>3</sub>H<sub>6</sub>-CO-O<sub>2</sub>-H<sub>2</sub>O). By applying an electric field to the semiconductor catalyst, low-temperature operation of TWC can be achieved even at 473 K by virtue of the activated surface-lattice oxygen.

Optimization and mechanism of Acid Orange 7 removal by powdered activated carbon coupled with persulfate by response surface method

2019 ◽  
Vol 79 (6) ◽  
pp. 1195-1205 ◽  
Author(s):  
Xuxu Wang ◽  
Xuebin Hu ◽  
Chun Zhao ◽  
Zhihua Sun ◽  
Huaili Zheng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Response Surface ◽  
Response Surface Method ◽  
Acid Orange 7 ◽  
Promoting Effect ◽  
Acid Orange ◽  
Carbon Reduction ◽  
Decolorization Rate ◽  
Surface Method ◽  
Initial Ph

Abstract In this study, powder activated carbon (PAC) utilized to activate peroxydisulfate (PDS) was investigated for decolorization of Acid Orange 7 (AO7). The results indicated a remarkable synergistic effect in the PAC/PDS system. The effect of PAC, PDS dosages and initial pH on AO7 decolorization were studied and the processes followed first-order kinetics. Response surface method with central composite design (CCD) model was utilized to optimize these three factors and analyze the combined interaction. The optimum condition for the decolorization rate of AO7 was analyzed as the following: PAC (0.19 g/L), PDS (1.64 g/L), and initial pH (4.14). Cl− and SO42− showed a promoting effect on AO7 decolorization while HCO3− had a slightly inhibiting effect. Quenching experiments confirmed that both sulfate and hydroxyl radicals were the oxidizing species, and the oxidation reaction occurred on the surface of PAC. The results of UV-vis spectrum with 100% decolorization rate and the 50% total organic carbon reduction indicated highly efficient decolorization and mineralization of AO7 in the PAC/PDS system. Finally, the recovery performance of PAC was studied and the result indicated PAC had poor reuse in reactivity.

The promoting effect of visible light on the CO + NO reaction over the Pd/N–TiO2 catalyst

2019 ◽  
Vol 9 (14) ◽  
pp. 3637-3646
Author(s):  
Xiaofang Tan ◽  
Gang Cheng ◽  
Xinjie Song ◽  
Xun Chen ◽  
Wenxin Dai ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
No Reduction ◽  
Light Irradiation ◽  
Promoting Effect ◽  
Efficient Catalyst ◽  
Tio2 Catalyst ◽  
No Reduction By Co ◽  
Lower Temperature

Pd/N–TiO2 was readily synthesized as an efficient catalyst for NO reduction by CO at lower temperature under visible light irradiation.

Activated carbon-supported catalyst loading of CH4N2O for selective reduction of NO from flue gas at low temperatures

2019 ◽  
Vol 44 (26) ◽  
pp. 13523-13537 ◽  
Author(s):  
Kaijie Liu ◽  
Qingbo Yu ◽  
Baolan Wang ◽  
Huaqing Xie ◽  
Wenjun Duan ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Flue Gas ◽  
Low Temperatures ◽  
Supported Catalyst ◽  
Selective Reduction ◽  
Catalyst Loading ◽  
Reduction Of No

scholarly journals Photoconductivity of activated carbon fibers

1991 ◽  
Vol 6 (5) ◽  
pp. 1040-1047 ◽  
Author(s):  
K. Kuriyama ◽  
M.S. Dresselhaus
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Carbon Fibers ◽  
Low Temperatures ◽  
Room Temperature ◽  
High Surface ◽  
Localized States ◽  
Activated Carbon Fibers ◽  
Disordered Carbon ◽  
Increasing Temperature

The conductivity and photoconductivity are measured on a high-surface-area disordered carbon material, i.e., activated carbon fibers, to investigate their electronic properties. This material is a highly disordered carbon derived from a phenolic precursor, having a huge specific surface area of 1000–2000 m2/g. Our preliminary thermopower measurements show that the dominant carriers are holes at room temperature. The x-ray diffraction pattern reveals that the microstructure is amorphous-like with Lc ≃ 10 Å. The intrinsic electrical conductivity, on the order of 20 S/cm at room temperature, increases by a factor of several with increasing temperature in the range 30–290 K. In contrast, the photoconductivity in vacuum decreases with increasing temperature. The magnitude of the photoconductive signal was reduced by a factor of ten when the sample was exposed to air. The recombination kinetics changes from a monomolecular process at room temperature to a bimolecular process at low temperatures, indicative of an increase in the photocarrier density at low temperatures. The high density of localized states, which limits the motion of carriers and results in a slow recombination process, is responsible for the observed photoconductivity.

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