Enhancing catalytic performance of Cu-SSZ-13 for NH3-SCR reaction via in situ introduction of Fe3+ with diatomite

2021 ◽  
Author(s):  
Mengyang Chen ◽  
Yingzhen Wei ◽  
Jinfeng Han ◽  
Wenfu Yan ◽  
Jihong Yu
Keyword(s):  
High Temperature ◽  
Catalytic Performance ◽  
Hydrothermal Stability ◽  
Highly Efficient ◽  
Nh3 Scr ◽  
Cu Catalyst

The SSZ-13 zeolite supported Cu catalyst is highly efficient in eliminating the NOx and introduction of Fe3+ ions can significantly improve the high-temperature activity and the hydrothermal stability of Cu-SSZ-13....

In situ regeneration of commercial NH3-SCR catalysts with high-temperature water vapor

2018 ◽  
Vol 116 ◽  
pp. 57-61 ◽  
Author(s):  
Yao Shi ◽  
Pei Zhang ◽  
Tuotuo Fang ◽  
Erhao Gao ◽  
Fujuan Xi ◽  
...  
Keyword(s):  
Water Vapor ◽  
High Temperature ◽  
Nh3 Scr ◽  
High Temperature Water ◽  
In Situ Regeneration ◽  
Scr Catalysts ◽  
Temperature Water

Oxidative Carbonylation of Methanol to Dimethyl Carbonate by Chlorine-Free Homogeneous and Immobilized 2,2'-Bipyrimidine Modified Copper Catalyst

2007 ◽  
Vol 72 (8) ◽  
pp. 1094-1106 ◽  
Author(s):  
Szilárd Csihony ◽  
László T. Mika ◽  
Gábor Vlád ◽  
Katalin Barta ◽  
Christian P. Mehnert ◽  
...  
Keyword(s):  
High Pressure ◽  
Dimethyl Carbonate ◽  
Copper Catalyst ◽  
Catalytic Performance ◽  
Spectroscopic Studies ◽  
Oxidative Carbonylation ◽  
Cu Catalyst

A chlorine-free catalyst, prepared in situ from Cu(II) acetate and 2,2'-bipyrimidine, can be used for the oxidative carbonylation of methanol to dimethyl carbonate. In situ high pressure IR and NMR spectroscopic studies suggest the formation of [Cu(2,2'-bipyrimidine)(CO)- (OMe)] as one of the key intermediates. The catalytic performance of the 2,2'-bipyrimidine-modified Cu-catalyst is similar to the CuCl-based system. The chlorine free catalyst can be immobilized by using the copolymer of 5-vinyl-2,2'-bipyrimidine and styrene.

scholarly journals The Effect of Tourmaline on SCR Denitrification Activity of MnOx/TiO2 at Low Temperature

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1020
Author(s):  
Yizhe Helian ◽  
Suping Cui ◽  
Xiaoyu Ma
Keyword(s):  
Low Temperature ◽  
Catalytic Reduction ◽  
Catalytic Performance ◽  
Scr Catalyst ◽  
Highly Efficient ◽  
Nh3 Scr ◽  
Catalytic Material ◽  
Acidic Sites ◽  
Denitrification Activity ◽  
The Stability

Selective catalytic reduction (SCR) technology is the most widely used flue gas denitration technology at present. The stability of a catalyst is the main factor limiting the development of this technology. In this study, an environmentally friendly and highly efficient NH3-SCR catalyst was prepared by coprecipitation method from acidolysis residue of industrial waste and tourmaline. We found that the addition of tourmaline has an important impact on the denitration activity of the catalytic material. The NOx conversion exceeded 97% at 200 °C with the dosage of 10% tourmaline, which is about 7% higher than that without doping. The improvement of catalytic performance was mostly attributed to the permanent electrodes of tourmaline, which effectively promotes the dispersion of MnOx/TiO2 catalytic materials, increases the number of acidic sites and changes the valence distribution of manganese ions in products, which speeds up the diffusion of protons and ions, resulting in the acceleration of redox reaction. These as-developed tourmaline-modified MnOx/TiO2 materials have been demonstrated to be promising as a new type of highly efficient low-temperature NH3-SCR catalyst.

Grain size effect on the high-temperature hydrothermal stability of Cu/SAPO-34 catalysts for NH3-SCR

2020 ◽  
Vol 8 (6) ◽  
pp. 104559
Author(s):  
Haidi Xu ◽  
Chenlu Lin ◽  
Qingjin Lin ◽  
Xi Feng ◽  
Zhifeng Zhang ◽  
...  
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Size Effect ◽  
Hydrothermal Stability ◽  
Grain Size Effect ◽  
Nh3 Scr

scholarly journals A reconstruction strategy for the synthesis of Cu-SAPO-34 with excellent NH3-SCR catalytic performance and hydrothermal stability

2020 ◽  
Vol 41 (9) ◽  
pp. 1410-1420
Author(s):  
Lijing Sun ◽  
Miao Yang ◽  
Yi Cao ◽  
Peng Tian ◽  
Pengfei Wu ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Hydrothermal Stability ◽  
Nh3 Scr ◽  
Reconstruction Strategy

scholarly journals A strategy for constructing highly efficient Co3O4-C@SiO2 nanofibers catalytic membrane for NOx-SCR and dust removal

2021 ◽  
Author(s):  
Huixian Zhou ◽  
Yutang Kang ◽  
Hui zhong ◽  
Bin Chen ◽  
Shuanglu Ma ◽  
...  
Keyword(s):  
High Performance ◽  
Gas Permeability ◽  
Catalytic Performance ◽  
Filtration Efficiency ◽  
Co3o4 Nanoparticles ◽  
Catalytic Membrane ◽  
Nh3 Scr ◽  
Nanofiber Membranes ◽  
And Performance

The strategy of constructing catalytic membrane has a significant influence on its structure and performance. In this work, Co3O4-Cx@SiO2 nanofiber membranes (NFMs) were fabricated by an in-situ growth–pyrolysis–oxidation strategy. The Co3O4-Cx catalyst derived from ZIF-67 was wrapped around nanofibers, which helps to maintain a stable membrane structure, then suppressing the reduction of gas permeability. Among the Co3O4-Cx catalyst, the carbon skeleton can prevent the agglomeration of Co3O4 nanoparticles, obtaining an ultra-fine Co3O4 nanoparticles with high dispersibility, redox property and surface area. The obtained Co3O4-C300@SiO2 NFM exhibits excellent filtration efficiency and low pressure drop for PM2.5 (99.99% and 55 Pa) and outstanding catalytic performance with T90 of 245 °C for NH3-SCR, which is 40.3% higher than that of Co3O4@SiO2 NFM. This work might provide a universal strategy for the preparation of catalytic membrane with high-performance.

Comprehensive effect of tuning Cu/SAPO-34 crystals using PEG on the enhanced hydrothermal stability for NH3-SCR

2021 ◽  
Author(s):  
Qingjin Lin ◽  
Shuang Liu ◽  
Shuhao Xu ◽  
Shi Xu ◽  
Mingming Pei ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Hydrothermal Stability ◽  
Hierarchical Zeolite ◽  
Nh3 Scr ◽  
Zeolite Crystals

PEG fabricates advantageous hierarchical zeolite crystals, enhancing the high-temperature and low-temperature hydrothermal stability of Cu/SAPO-34.

Novel approach for a cerium-based highly-efficient catalyst with excellent NH3-SCR performance

2014 ◽  
Vol 4 (10) ◽  
pp. 3611-3614 ◽  
Author(s):  
Haili Huang ◽  
Wenpo Shan ◽  
Shijian Yang ◽  
Jinhua Zhang
Keyword(s):  
Low Temperature ◽  
Catalytic Performance ◽  
Efficient Catalyst ◽  
Scr Catalyst ◽  
Highly Efficient ◽  
Nh3 Scr ◽  
Novel Approach ◽  
Operational Temperature ◽  
Temperature Window ◽  
Excellent Catalytic Performance

A highly-efficient NH3-SCR catalyst, CeO2/WO3–TiO2, was prepared by a novel stepwise precipitation approach. This catalyst showed excellent catalytic performance with superior low-temperature activity, high N2 selectivity and a broad operational temperature window.

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