Production of High-Purity Titanium Dioxide from Spent Selective Catalytic Reduction (SCR) Catalyst

2019 ◽  
pp. 119-129 ◽  
Author(s):  
Gyeonghye Moon ◽  
Jin-Hyung Kim ◽  
Yeon-Chul Cho ◽  
In-hyeok Choi ◽  
Hee-Nam Kang ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Selective Catalytic Reduction ◽  
High Purity ◽  
Catalytic Reduction ◽  
Scr Catalyst ◽  
Purity Titanium

Heterogeneous Mercury Reaction on a Selective Catalytic Reduction (SCR) Catalyst

2007 ◽  
Vol 121 (3-4) ◽  
pp. 219-225 ◽  
Author(s):  
Yujin Eom ◽  
Seok Ho Jeon ◽  
Thanh An Ngo ◽  
Jinsoo Kim ◽  
Tai Gyu Lee
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Scr Catalyst

scholarly journals Reduction of NOx Emission of a Diesel Engine with a Multiple Injection Pump by SCR Catalytic Converter

2016 ◽  
Vol 64 (4) ◽  
pp. 1205-1210 ◽  
Author(s):  
Vít Marek ◽  
Lukáš Tunka ◽  
Adam Polcar ◽  
Dušan Slimařík
Keyword(s):  
Diesel Engine ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Catalytic Converter ◽  
Nox Emission ◽  
Multiple Injection ◽  
Scr Catalyst ◽  
Exhaust Gases ◽  
Injection Pump ◽  
Reduction Of Nox

This paper deals with reduction of NOx-emission of a diesel engine with multiple injection pump by SCR catalytic converter. Main aim of the measurement was the detection of SCR catalyst converter efficiency. Tests were realized at the Research and Development workplace of Zetor Tractor a.s. Used engine was equipped with a multiple injection pump with electromagnetic regulator of a fuel charge. During the experiment selective catalytic reduction and diesel particulate filter were used as an after treatment of harmful pollutants reduction. Testing cycle of the eight-point test was chosen and Non-Road Steady Cycle (NRSC) was maintained according to 97/68/EC directive. Results confirmed the dependencies between temperatures of SCR catalyst and exhaust gases and the volume of exhaust gases on efficiency of SCR catalyst. During the operation load of the engine, selective catalytic reduction reached efficiency over 90 %. Used after treatment system is suitable for reduction of harmful pollutants according to the Tier 4f norm.

scholarly journals Recent Developments in the Recycling of Spent Selective Catalytic Reduction Catalyst in South Korea

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 182 ◽  
Author(s):  
In-Hyeok Choi ◽  
Yeon-Chul Cho ◽  
Gyeonghye Moon ◽  
Hee-Nam Kang ◽  
YoungBok Oh ◽  
...  
Keyword(s):  
South Korea ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Scale Up ◽  
Practical Method ◽  
Recycling Process ◽  
Scr Catalyst ◽  
Recent Developments ◽  
Process Scale Up ◽  
Commercial Process

Spent selective catalytic reduction (SCR) catalyst installed in power and incineration plants is used to convert nitrogen oxide (NOx) gas to nitrogen (N2) gas. Currently, most spent SCR catalyst in South Korea is eventually discarded in landfills. Recently, a novel and efficient recycling process has been developed to recover tungsten (W), vanadium (V) and titanium (Ti) from spent SCR catalyst. In this process, after soda-melting reactions between the spent SCR catalyst and sodium carbonate (Na2CO3) at 1273 K, hydrometallurgical treatments were carried out for the production of high-purity products, such as 99.3% sodium tungstate (Na2WO4), 99.3% vanadium oxide (V2O5) and 99.6% titanium dioxide (TiO2). On the basis of the fundamental investigation of this novel recycling process, process scale-up has been attempted to establish a commercial process. In this paper, recent developments in the recycling process for spent SCR catalyst and the results obtained using the scaled-up process will be discussed. Therefore, this study will provide a practical method for the recovery of W, V and Ti from spent SCR catalyst.

scholarly journals Promotional effect of niobium substitution on the low-temperature activity of a WO3/CeZrOxmonolithic catalyst for the selective catalytic reduction of NOxwith NH3

RSC Advances ◽  
2017 ◽  
Vol 7 (75) ◽  
pp. 47570-47582 ◽  
Author(s):  
Haidi Xu ◽  
Qingjin Lin ◽  
Yun Wang ◽  
Li Lan ◽  
Shuang Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Promising Candidate ◽  
Scr Catalyst ◽  
Promotional Effect

Optimal WO3substituted by Nb2O5could obviously improve the low-temperature NH3-SCR activity of WO3/Ce0.68Zr0.32O2, and the Nb-substituted catalyst showed excellent SO2and H2O tolerance could be a promising candidate for NH3-SCR catalyst.

scholarly journals Scalable synthesis of high-purity TiO2 whiskers via ion exchange method enables versatile applications

RSC Advances ◽  
2019 ◽  
Vol 9 (41) ◽  
pp. 23735-23743 ◽  
Author(s):  
Mingxu Wang ◽  
Qiang Gao ◽  
Hao Duan ◽  
Mingqiao Ge
Keyword(s):  
Titanium Dioxide ◽  
Ion Exchange ◽  
High Purity ◽  
Exchange Method ◽  
Crystal Forms ◽  
Ion Exchange Method ◽  
Scalable Synthesis ◽  
Purity Titanium

In this work, high-purity titanium dioxide (TiO2) whiskers with different crystal forms were synthesized via ion exchange and controlled calcination methods.

A Novel MnOx Supported Palygorskite SCR Catalyst for Lower Temperature NO Removal from Flue Gases

2011 ◽  
Vol 356-360 ◽  
pp. 974-979 ◽  
Author(s):  
Xian Long Zhang ◽  
Bo Wen Shi ◽  
Xue Ping Wu ◽  
Wei Ping Jiang ◽  
Bao Jun Yang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Manganese Oxide ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Flue Gases ◽  
Scr Catalyst ◽  
No Removal ◽  
Highly Active ◽  
Lower Temperature ◽  
Scr Of Nox

Palygorskite supported manganese oxide catalysts (MnOx/PG) were prepared for lower temperature selective catalytic reduction (SCR) of NOx by NH3. Catalyst’s SCR activity was estimated at varied temperatures. Catalyst’s properties were characterized by XRD, NH3adsorption and TPD. Results showed that MnOx/PG catalyst was highly active for SCR at low-temperature. It was also found that NH3 was mainly adsorbed on palygorskite in two forms. Weakly adsorbed NH3, which was seldom inhibited by loading of MnOx, but was more favorable to SCR. Whereas strongly adsorbed NH3was more likely to be inhibited by MnOx loading but was inessential for SCR.

The deactivation mechanism of Pb on the Ce/TiO2 catalyst for the selective catalytic reduction of NOx with NH3: TPD and DRIFT studies

2017 ◽  
Vol 19 (7) ◽  
pp. 5333-5342 ◽  
Author(s):  
Shu-xian Wang ◽  
Rui-tang Guo ◽  
Wei-guo Pan ◽  
Ming-yuan Li ◽  
Peng Sun ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Scr Catalyst ◽  
Tio2 Catalyst ◽  
Poisoning Effect ◽  
Reduction Of Nox ◽  
Deactivation Mechanism

It was well recognized that Pb had a poisoning effect on a SCR catalyst. In this study, the deactivation mechanism of Pb on the Ce/TiO2 catalyst was investigated based on the characterization results of TPD and in situ DRIFT studies.

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