The enhanced catalytic activity of Cu/SAPO-34 by ion exchange method for selective catalytic reduction of nitric oxide

The Zn and Ni were introduced into HZSM-5 zeolite by ion exchange method with aqueous solutions of Zn(NO3)2 and Ni(NO3)2, to investigate the catalytic activity and selectivity of modified Zn-HZSM-5 and Ni-HZSM-5 catalysts for conversion of butane-butylenes technical mixtures in a fixed-bed stainless-steel reactor (Twin Reactor System Naky) at 450�C, at atmospheric pressure for Zn-HZSM-5 and at 4 atm. total pressure for Ni-HZSM-5 and at a space velocity (WHSV) of 1h-1. The catalysts were characterized using XRD, SEM, and NH3-TPD analysis for their structure, morphology and acidity. The catalytic activity of the same catalyst were examined during over 10 catalytic tests (with regeneration of catalyst after each test) using mixtures of butanes-butylenes.

Download Full-text

Removal of NO by Selective Catalytic Reduction with Ethylene over Catalyst Cu/ZSM-5

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.71-78.2806 ◽

2011 ◽

Vol 71-78 ◽

pp. 2806-2813

Author(s):

Jiang Jun Hu ◽

Qian Ma ◽

Ling Ouyang ◽

Xi Chen ◽

Fu Xing Gan

Keyword(s):

Nitric Oxide ◽

Catalytic Activity ◽

Selective Catalytic Reduction ◽

Influencing Factors ◽

Catalytic Reduction ◽

Impregnation Method ◽

Wet Impregnation ◽

Gas Concentration ◽

Oxygen Gas ◽

Wet Impregnation Method

The selective catalytic reduction of nitric oxide by ethylene was studied over Cu/ZSM-5 catalyst in the temperature range of 200-550°C, in which NO cannot be reduced by ethylene without Cu/ZSM-5 catalyst. Prepared Cu/ZSM-5 catalyst in varies loading as Na/ZSM-5 by the wet impregnation method, and the effect of the catalytic activity was studied in varies fitting temperatures. Several influencing factors, such as the different reaction temperatures, oxygen gas concentration, and Cu2+ concentration were investigated. Cu-Ce-ZSM-5 catalyst was prepared by wet impregnation method and the metallic influence of CeO2 to the catalytic ability was studied.

Download Full-text

Characterization of Modified HZSM–5 with Gallium and its Reactivity in Direct Conversion of Methane to Liquid Hydrocarbons

Jurnal Teknologi ◽

10.11113/jt.v35.617 ◽

2012 ◽

Author(s):

Nor Aishah Saidina Amin ◽

Asmadi Ali

Keyword(s):

Catalytic Activity ◽

Ion Exchange ◽

Zeolite Catalyst ◽

Nitrogen Adsorption ◽

Direct Conversion ◽

Liquid Hydrocarbons ◽

Exchange Method ◽

Conversion Of Methane ◽

Ion Exchange Method

Mangkin zeolit HZSM–5 diubahsuai secara kaedah pertukaran ion berasid bagi menghasilkan mangkin zeolit Ga–HZSM–5. Aktiviti bermangkin bagi HZSM–5 dan Ga–HZSM–5 dikaji pada suhu tindak balas 800°C dan halaju ruang jaman masa (GHSV) 7500 jam–1. Mangkin HZSM–5 dan Ga–HZSM–5 dicirikan secara XRD, NMR, Penjerapan Nitrogen dan TPD. Hasil pencirian menunjukkan aluminium keluar dari kerangka asal. HZSM–5 yang mengandungi galium adalah mangkin yang lebih baik daripada mangkin zeolit HZSM–5 bagi menghasilkan cecair hidrokarbon. Kata kunci: Ga-HZSM-5; metana; pertukaran ion berasid; cecair hidrokarbon The HZSM–5 zeolite catalyst was modified by an acidic ion exchange method to produce the Ga–HZSM–5 zeolite catalyst. The catalytic activity of HZSM–5 and Ga–HZSM–5 were studied at reaction temperature of 800°C and gas hourly space velocities (GHSV) of 7500 hr–1. HZSM–5 and Ga–HZSM–5 catalysts were characterized by XRD, NMR, Nitrogen Adsorption and TPD. The characterization results revealed that aluminium was removed from the parent framework. Gallium loaded HZSM–5 is a better catalyst than HZSM–5 zeolite catalyst to produce liquid hydrocarbons. Key words: Ga-HZSM-5; methane; acidic ion exchange; liquid hydrocarbons

Download Full-text

The DeNOx Characteristics of V/Ti Plate SCR Catalysts

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.1712 ◽

2011 ◽

Vol 356-360 ◽

pp. 1712-1715

Author(s):

Qiang Lu ◽

Shu Hua Su ◽

Shi Ye Fen ◽

Wei Liang Cheng ◽

Chang Qing Dong

Keyword(s):

Nitric Oxide ◽

Catalytic Activity ◽

Selective Catalytic Reduction ◽

Flue Gas ◽

Catalytic Reduction ◽

Incipient Wetness Impregnation ◽

Impregnation Method ◽

Negative Effects ◽

V2o5 Content ◽

Scr Catalysts

A series of V2O5/WO3/TiO2plate catalysts were prepared via the incipient wetness impregnation method, with the V2O5content of 0.68 wt%, 1.01 wt%, 1.19 wt%, 1.5 wt% and the WO3loading of 4.8 wt%, 6.2 wt%, 7.9 wt%, 9.2 wt%, respectively. Selective catalytic reduction of nitric oxide by ammonia (NH3-SCR) experiments were performed to investigate the effects of the several factors on the performance of the catalysts, including the V2O5, WO3and MoO3content in the catalysts and the O2concentration in the flue gas. The results indicated that as the rising of the V2O5 content, the SCR activity of the V2O5/WO3/TiO2catalysts was firstly increased and then slightly decreased, with the best activity obtained at the V2O5content of 1.19 wt%. As the increasing of the WO3content, the activity was firstly increased slightly and then almost kept constant. Furthermore, the loading of the MoO3on the V2O5/WO3/TiO2plate catalysts would bring negative effects to the catalytic activity. In addition, the capability of the catalysts would slightly increase as the O2concentration rising up to 7%, and then became stable at higher O2concentrations.

Download Full-text

Modification of acid on beta zeolite catalysts by ion-exchange method for ethanol dehydration to diethyl ether

Mediterranean Journal of Chemistry ◽

10.13171/mjc107020081481bj ◽

2020 ◽

Vol 10 (7) ◽

pp. 697

Author(s):

Montri Thapplee ◽

Chadaporn Krutpijit ◽

Piyasan Praserthdam ◽

ฺีBunjerd Jongsomjit

Keyword(s):

Catalytic Activity ◽

Ion Exchange ◽

Surface Area ◽

Diethyl Ether ◽

Nitrate Solution ◽

Beta Zeolite ◽

Ethanol Conversion ◽

Ethanol Dehydration ◽

Exchange Method ◽

Ion Exchange Method

<p class="Mabstract">The catalytic ethanol dehydration to diethyl ether (DEE) over the synthesized beta zeolite (BEA) with different acidity on catalysts having Na and mixed Na-H forms was studied. The Na form of BEA catalyst was synthesized via the hydrothermal process, including non-calcined (Na-BEA_N) and calcined (Na-BEA_C) catalysts. The Na-BEA_C catalyst was successively used in the synthesis of different mixed Na-H forms under the ion-exchange method using the ammonium nitrate solution at 70°C for 2 h/cycle. In the present study, two different cycles were chosen, including one cycle (M-BEA_1) and four cycles (M-BEA_4) to compare the amount of acidity on catalysts. The results indicated that the M-BEA_1 catalyst exhibited a large surface area and contained the highest moderate acid site, which strongly affected the optimal catalytic activity at low temperature (<250°C) with ethanol conversion of 74.6% and DEE yield of 27.3%. However, the increased number of ion-exchange cycles had not shown remarkable effects on catalytic activity due to low surface area and moderate acidity.<strong></strong></p>

Download Full-text