Photoassisted Fenton degradation of phthalocyanine dyes from wastewater of printing industry using Fe(Ⅱ)/γ-Al2O3 catalyst in up-flow fluidized-bed

Fe(II)/γ-Al2O3 powders synthesized using the dipping method were produced from a mixed aqueous solution containing aluminium oxide(γ-Al2O3) and iron(II)-precursor(FeSO4), and used for photoFenton degradation of phthalocyanine dyes(PCS) under ultraviolet(UV) irradiation in an up-flow fluidized bed. The catalysts were characterized by XRD, ESCA, BET, EDS and SEM. The results showed that Fe2+ion was compounded on the γ-Al2O3 carrier. The effects of different reaction parameters such as catalyst activity, dosage and solution pH on the decolorization of PCS were assessed. Results indicated that maximum decolorization(more than 95%) of PCS occurred with20 wt% Fe(II)/γ-Al2O3 catalyst(dosage of 60 g/L) using a combination of UV irradiation and heterogeneous Fenton system. The degradation efficiency of PCSincreases as pH decreases, exhibiting a maximum efficiency at pH 3.5. The recycled catalyst was capable of repeating three runs without a significant decrease in treatment efficiency, and this demonstrated the stability and reusability of catalyst.     

Activity and hydrothermal stability of CeO2–ZrO2–WO3 for the selective catalytic reduction of NOx with NH3

A series of CeO_2–ZrO_2–WO_3(CZW)catalysts prepared by a hydrothermal synthesis method showed excellent catalytic activity for selective catalytic reduction(SCR)of NO with NH_3 over a wide temperature of 150–550°C.The effect of hydrothermal treatment of CZW catalysts on SCR activity was investigated in the presence of 10% H_2O.The fresh catalyst showed above 90% NO_x conversion at 201–459°C,which is applicable to diesel exhaust NO_x purification(200–440°C).The SCR activity results indicated that hydrothermal aging decreased the SCR activity of CZW at low temperatures(below 300°C),while the activity was notably enhanced at high temperature(above 450°C).The aged CZW catalyst(hydrothermal aging at 700°C for 8 hr)showed almost 80% NO_x conversion at 229–550°C,while the V_2O_5–WO_3/TiO_2 catalyst presented above 80% NO_x conversion at 308–370°C.The effect of structural changes,acidity,and redox properties of CZW on the SCR activity was investigated.The results indicated that the excellent hydrothermal stability of CZW was mainly due to the CeO_2–ZrO_2 solid solution,amorphous WO_3 phase and optimal acidity.In addition,the formation of WO_3 clusters increased in size as the hydrothermal aging temperature increased,resulting in the collapse of structure,which could further affect the acidity and redox properties.     

Preparation and catalytic properties of ZrO2-Al2O3 composite oxide supported nickel catalysts for methane reforming with carbon dioxide

ZrO2-Al2O3 composite oxides and supported Ni catalysts were prepared, and characterized by N2 adsorption/desorption, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques. The catalytic performance and carbon deposition was also investigated. This mesoporous composite oxide is shown to be a promising catalyst support. An increase in the catalytic activity and stability of methane and carbon dioxide reforming reaction was resulted from the zirconia addition, especially at 5wt% ZrO2 content. The Ni catalyst supported ZrO2-Al2O3 has a strong resistance to sintering and the carbon deposition in a relatively long-term reaction.     

Fe2O3 particles as superior catalysts for low temperature selective catalytic reduction of NO with NH3

Fe203 particle catalysts were experimentally studied in the low temperature selective catalytic reduction （SCR） of NO with NH3. The effects of reaction temperature, oxygen concentration, [NH3]/[NO] molar ratio and residence time on SCR activity were studied. It was found that Fe203 catalysts had high activity for the SCR of NO with NH3 in a broad temperature range of 150-270℃, and more than 95% NO conversion was obtained at 180℃ when the molar ratio [NH3]/[NO] = 1, the residence time was 0.48 seconds and 02 volume fraction was 3%. In addition, the effect of SO2 on SCR catalytic activity was also investigated at the temperature of 180℃. The results showed that deactivation of the Fe2O3 particles occurred due to the presence of SO2 and the NO conversion decreased from 99.2% to 58% in 240 min, since SO2 gradually decreased the catalytic activity of the catalysts. In addition, X-ray diffraction, Thermogravimetric analysis and Fourier transform infrared spectroscopy were used to characterize the fresh and deactivated Fe2O3 catalysts. The results showed that the deactivation caused by SO2 was due to the formation of metal sulfates and ammonium sulfates on the catalyst surface during the de-NO reaction, which could cause pore plugging and result in suppression of the catalytic activity.     

Effect of Ce doping of TiO2 support on NH3-SCR activity over V2O5-WO3/CeO2-TiO2 catalyst

CeO2–TiO2composite supports with different Ce/Ti molar ratios were prepared by a homogeneous precipitation method, and V2O5–WO3/CeO2–TiO2catalysts for the selective catalytic reduction（SCR） of NOx with NH3 were prepared by an incipient-wetness impregnation method. These catalysts were characterized by means of BET, XRD, UV–Vis,Raman and XPS techniques. The results showed that the catalytic activity of V2O5–WO3/TiO2 was greatly enhanced by Ce doping（molar ratio of Ce/Ti = 1/10） in the TiO2 support.The catalysts that were predominantly anatase TiO2 showed better catalytic performance than the catalysts that were predominantly fluorite CeO2. The Ce additive could enhance the surface adsorbed oxygen and accelerate the SCR reaction. The effects of O2 concentration, ratio of NH3/NO, space velocity and SO2 on the catalytic activity were also investigated. The presence of oxygen played an important role in NO reduction. The optimal ratio of NH3/NO was 1/1 and the catalyst had good resistance to SO2 poisoning.     

Treatment of phenol wastewater by microwave-induced CIO_2-CuO_x/Al_2O_3 catalytic oxidation process

The catalyst of CuO_x/Al_2O_3 was prepared by the dipping-sedimentation method usingγ-Al_2O_3 as a supporter.CuO and Cu_2O were loaded on the surface of Al_2O_3,characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS).In the presence of CuO_x/Al_2O_3,the microwave-induced chlorine dioxide(ClO_2) catalytic oxidation process was conducted for the treatment of synthetic wastewater containing 100 mg/L phenol.The factors influencing phenol removal were investigated and the results showed that microwave-induced ClO_2-CuO_x/Al_2O_3 process could effectively degrade contaminants in a short reaction time with a low oxidant dosage,extensive pH range.Under a given condition(ClO_2 concentration 80 mg/L,microwave power 50 W,contact time 5 min,catalyst dosage 50 g/L,pH 9),phenol removal percentage approached 92.24%,corresponding to 79.13% of COD_(Cr) removal.The removal of phenol by microwave-induced ClO_2-CuO_x/Al_2O_3 catalytic oxidation process was a complicated non-homogeneous solid/water reaction, which fitted pseudo-first-order by kinetics.Compared with traditional ClO_2 oxidation,ClO_2 catalytic oxidation and microwave-induced ClO_2 oxidation,microwave-induced ClO_2 catalytic oxidation system could significantly enhance the degradation efficiency.It provides an effective technology for the removal of phenol wastewater.     

Effects of synthesis methods on catalytic activities of CoOx–TiO2 for low-temperature NH3-SCR of NO

A series of cobalt doped TiO_2(Co-TiO_2) and Co Oxloaded TiO_2(Co/TiO_2) catalysts prepared by sol–gel and impregnation methods respectively were investigated on selective catalytic reduction with NH_3(NH_3-SCR) of NO. It was found that Co-TiO_2 catalyst showed more preferable catalytic activity at low temperature range. From characterization results of XRD,TEM, Raman and FT-IR, Co species were proved to be doped into TiO_2 lattice by replaced Ti atoms. After being characterized and analyzed by NH_3-TPD, PL, XPS, EPR and DRIFTS, it was found that the better NH_3-SCR activities of Co-TiO_2 catalysts, compared with Co/TiO_2 catalyst, were ascribed to the formation of more oxygen vacancies which further promoted the production of more superoxide ions(O-2). The superoxide ions were crucial for the formation of low temperature SCR reaction intermediates(NO-3) by reacting with adsorbed NO molecule. Therefore, these aspects were responsible for the higher low temperature NH_3-SCR activity of Co-TiO_2 catalysts.     

Advanced treatment of biologically pretreated coal gasification wastewater by a novel heterogeneous Fenton oxidation process

Sewage sludge from a biological wastewater treatment plant was converted into sewage sludge based activated carbon(SBAC) with Zn Cl2 as activation agent, which was used as a support for ferric oxides to form a catalyst(Fe Ox/SBAC) by a simple impregnation method.The new material was then used to improve the performance of Fenton oxidation of real biologically pretreated coal gasification wastewater(CGW). The results indicated that the prepared Fe Ox/SBAC significantly enhanced the pollutant removal performance in the Fenton process, so that the treated wastewater was more biodegradable and less toxic. The best performance was obtained over a wide p H range from 2 to 7, temperature 30°C, 15 mg/L of H2O2 and 1 g/L of catalyst, and the treated effluent concentrations of COD, total phenols,BOD5 and TOC all met the discharge limits in China. Meanwhile, on the basis of significant inhibition by a radical scavenger in the heterogeneous Fenton process as well as the evolution of FT-IR spectra of pollutant-saturated Fe Ox/BAC with and without H2O2, it was deduced that the catalytic activity was responsible for generating hydroxyl radicals, and a possible reaction pathway and interface mechanism were proposed. Moreover, Fe Ox/SBAC showed superior stability over five successive oxidation runs. Thus, heterogeneous Fenton oxidation of biologically pretreated CGW by Fe Ox/SBAC, with the advantages of being economical, efficient and sustainable, holds promise for engineering application.     

Enhanced catalytic complete oxidation of 1,2-dichloroethane over mesoporous transition metal-doped γ-Al_2O_3

High-surface-area mesoprous powders of γ-Al2O3 doped with Cu2+, Cr3+, and V3+ions were prepared via a modified sol–gel method and were investigated as catalysts for the oxidation of chlorinated organic compounds. The composites retained high surface areas and pore volumes comparable with those of undoped γ-Al2O3 and the presence of the transition metal ions enhanced their surface acidic properties. The catalytic activity of the prepared catalysts in the oxidation of 1,2-dichloroethane(DCE) was studied in the temperature range of 250–400°C. The catalytic activity and product selectivity were strongly dependent on the presence and the type of dopant ion. While Cu2+- and Cr3+-containing catalysts showed100% conversion at 300°C and 350°C, V3+-containing catalyst showed considerably lower conversion. Furthermore, while the major products of the reactions over γ-alumina were vinyl chloride(C2H3Cl) and hydrogen chloride(HCl) at all temperatures, Cu- and Cr-doped catalysts showed significantly stronger capability for deep oxidation to CO2.     

N2O decomposition over K/Na-promoted Mg/Zn-Ce-cobalt mixed oxides catalysts

Three groups of cobalt mixed oxide catalysts（Mg/Zn-Co, Mg/Zn-Ce-C, K/Na-Mg/Zn-Ce-Co）were prepared by sol-gel or impregnation methods. The synergistic effects of transition metal, rare earth metal and alkali metal on cobalt mixed catalysts for nitrous oxide（N2O）decomposing to N2 and O2were investigated. The experimental results revealed that the catalytic activity for N2 O decomposition was promoted as Co2＋was replaced partially by Zn2＋/Mg2＋, moreover, the characterization analysis by XRD and XPS showed that Zn2＋/Mg2＋replaced Co2＋successfully into the spinel structure of Co3O4 and promoted significantly the catalytic activity. Especially, the addition of CeO2 and K2O/Na2O decreased the binding energy and resulted in an increase in the density of the electron cloud around Co and an improvement of the catalytic activity. Of the investigated cobalt mixed catalysts, the best catalytic activity was shown by 2% K-Zn0.5-Ce0.05-Co catalyst.     

Fe3O4/FeS2活化H2O2降解典型苯胂酸类污染物

利用水热法成功制备了Fe₃O₄/FeS₂催化剂,并将其用于构建非均相芬顿体系降解典型的苯胂酸类污染物（洛克沙胂,ROX）.XRD、SEM、XPS和磁学测量系统（VSM）等表征结果表明,Fe₃O₄/FeS₂呈明显的颗粒状且具有良好的磁性.降解实验结果显示,在最优条件下（初始pH值为4.5、ROX起始浓度为20mg/L、Fe₃O₄/FeS₂投加量为0.15g/L和H₂O₂浓度为0.034g/L,Fe₃O₄/FeS₂介导的非均相芬顿体系可以超快速降解ROX,1min后的降解效率达到96.74%,明显优于单独的Fe₃O₄或FeS₂体系.此外,Fe₃O₄/FeS₂可以通过磁铁进行快速回收利用,同时也具有良好的重复利用性能,使用3次后,ROX的降解效率仍超过80%.机理分析表明,Fe₃O₄/FeS₂能够快速地催化H₂O₂产生具有强氧化性的羟基自由基（·OH）.在·OH的作-用下,ROX分子结构中C-As、C-N和C-C等化学键发生断裂,发生脱砷、脱硝和开环等反应,进而生成一系列的有机产物（如酚类、醌类、小分子有机酸等）和无机产物（As （V）和NO₃^-）.之后,无机砷能够被吸附在催化剂表面,而有机产物则进一步被矿化.     

Preparation and characterization of Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst for degradation dye wastewater

In order to develop a catalyst with high activity for catalytic wet oxidation (CWO) process at room temperature and atmospheric pressure, Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst was prepared by consecutive impregnation method and the prepared parameters were optimized. The structure of the catalyst was characterized by BET, XRF, SEM and XPS technologies, and the actual wastewater was used to investigate the catalytic activity of Fe2O3-CeO2-TiO2/γ-Al2O3 in CWO process. The experimental results showed that the prepared catalyst exhibited good catalytic activity when the doping amount of Ti was 1.0 wt% (the weight ratio of Ti to carriers), and the middle product, CeO2-TiO2/γ-Al2O3, was calcined in 450℃ for 2 h. The CWO experiment for treating actual dye wastewater indicated that the COD, color and TOC of actual wastewater were decreased by 62.23%, 50.12% and 41.26% in 3 h,respectively, and the ratio of BOD5/COD was increased from 0.19 to 0.30.     

新型Fe3O4@α-MnO2活化过一硫酸盐降解水中偶氮染料

采用两步水热法制备了新型磁性纳米Fe₃O₄@α-MnO₂复合材料作为催化剂,用于活化过一硫酸盐（PMS）产生强氧化性的硫酸根自由基（SO₄^-·）氧化降解偶氮染料活性黑5（RBK5）.采用透射电子显微镜（TEM）,X射线粉末衍射仪（XRD）和振动样品磁强计（VSM）对制备的催化剂进行表征,证明成功合成了纳米α-MnO₂包覆Fe₃O₄形态的Fe₃O₄@α-MnO₂催化剂,催化剂的饱和磁化强度为39.89emu/g.Fe₃O₄@α-MnO₂催化剂活化PMS与单一的Fe₃O₄和α-MnO₂活化PMS相比,具有更高的催化效率,说明铁锰双金属存在协同作用.同时研究了催化剂的投加量、PMS的浓度和初始pH值等各种因素对RBK5的降解效率以及反应动力学的影响.实验结果表明,Fe₃O₄@α-MnO₂催化剂活化PMS降解RBK5的过程符合准一级反应动力学,在催化剂投加量为1.2g/L,PMS的浓度为4mmol/L,初始pH值为7.0,反应时间为60min的情况下,浓度为30mg/L的RBK5的降解效率可达到91%,此时RBK5的降解速率常数也达到最高值0.023min^-1.此外,通过加入自由基淬灭剂甲醇、叔丁醇和硝基苯判断了Fe₃O₄@α-MnO₂/PMS体系中起主要氧化降解作用的活性物种为SO₄^-·.     

Mn-Ce/γ-Al2O3催化臭氧氧化深度处理石化废水中试研究

针对臭氧催化氧化深度处理石化废水时催化剂适配性不高和臭氧利用率低下的问题,以我国北方某典型石化废水为中试平台,采用课题组自主研发的催化臭氧催化剂Mn-Ce/γ-Al₂O₃,研究以臭氧催化氧化为核心的7种工艺深度处理石化废水的效果.结果表明:①单独臭氧氧化工艺对石化二级废水COD、TOC和UV₂₅₄（254 nm处的UV吸光度）的去除率分别为15.45%、9.04%和30.72%.与单独臭氧氧化工艺相比,Mn-Ce/γ-Al₂O₃催化臭氧氧化工艺下,COD、TOC和UV₂₅₄的去除率分别提高了26.18%、18.25%和5.81%,同时三维荧光光谱（3D-EEM）结合区域积分法（FRI）分析结果显示,对荧光类有机物中溶解性微生物代谢产物和类腐殖酸的去除率分别提高了21.13%和29.47%.②单独臭氧氧化工艺中,序批式和连续流出水处理效果影响不大.Mn-Ce/γ-Al₂O₃催化臭氧氧化工艺下,序批式优于连续流,但序批式需增加人力和运营成本,在实际应用中受限.③微絮凝+臭氧催化氧化+回流联合工艺中,COD、TOC和UV₂₅₄的去除率分别可达53.20%、37.56%和50.90%,去除效果显著高于仅臭氧催化氧化工艺（COD、TOC和UV₂₅₄的去除率分别为41.63%、27.29%和36.53%）时;同时,类富里酸、类溶解性微生物代谢产物和类腐殖酸的去除率分别达到79.49%、50.70%和75.12%;Mn-Ce/γ-Al₂O₃催化剂运用72 d后,COD去除率基本稳定在30%左右.研究显示,臭氧催化氧化工艺深度处理石化废水中,Mn-Ce/γ-Al₂O₃是一种高效稳定型催化剂,絮凝预处理、回流均可增强有机物的去除率,可为石化废水处理工程实现减排降耗提供技术支撑.      

Fe3O4-RGO纳米复合催化剂类芬顿处理垃圾渗滤液

采用共沉淀法制备Fe₃O₄-RGO纳米复合催化剂,并将其应用于类芬顿处理垃圾渗滤液,研究了反应时间、初始pH值、催化剂质量浓度和H₂O₂投加量对Fe₃O₄-RGO纳米复合催化剂类芬顿降解垃圾渗滤液COD去除率的影响。结果表明:反应时间为90 min,初始pH值为3,催化剂质量浓度为1 mg/L,H₂O₂投加量为0.08 mmol/L时,COD去除率达到最大值64.7%。有机物组分对比结果显示,类芬顿反应后垃圾渗滤液中大分子有机物得到较好的降解转化。Fe₃O₄-RGO纳米复合催化剂具有较好的重复利用性,重复使用5次后对垃圾渗滤液的COD去除率仅降低2.3%。     

Fe3O4-nZVI类Fenton法降解水中磺胺甲恶唑

采用共沉淀和液相还原两步法制得四氧化三铁负载纳米零价铁(Fe₃O₄-nZVI),将其作为类Fenton反应的催化剂用于水中磺胺甲恶唑(SMX)的降解.通过批实验法研究了H₂O₂浓度、Fe₃O₄-nZVI投加量、pH值、SMX初始浓度、反应温度等因素对SMX降解的影响.SEM、EDS、XRD和XPS表征结果表明,制备的Fe₃O₄-nZVI为纳米级磁性复合材料.批实验结果表明,在一定实验条件范围内,提高H₂O₂浓度、Fe₃O₄-nZVI投加量和反应温度,以及降低体系pH值,均可提高SMX的降解率.动力学拟合参数表明,SMX的类Fenton催化降解符合拟一级动力学模型.在25℃时,当H₂O₂浓度为10mmol/L、Fe₃O₄-nZVI投加量为0.8g/L、pH=3、SMX初始浓度为10mg/L,SMX在180min时的降解率为99.61%.用VSM测得Fe₃O₄-nZVI的饱和磁化强度为105.52emu/g,表明其易于磁回收.重复利用实验表明,Fe₃O₄-nZVI具有较好的反应活性和稳定性.自由基淬灭实验表明,·OH的氧化作用是SMX降解的主要机理.     

γ-Fe2O3抗As2O3中毒能力的分子模拟

采用密度泛函理论研究了γ-Fe₂O₃表面As₂O₃的吸附以及掺杂改性提高抗As₂O₃中毒性能的作用机理.计算了As₂O₃在完整以及O缺陷γ-Fe₂O₃（001）表面的吸附性能,包括吸附位点、吸附结构、吸附能、PDOS等.同时建立了Mo、Ti、Mg掺杂的γ-Fe₂O₃模型,探讨了助剂掺杂对抗砷中毒能力的作用机制,并考虑了掺杂量的影响.结果表明：As₂O₃倾向于以O端化学吸附在γ-Fe₂O₃（001）表面Fe_oct位,吸附过程发生强烈的相互作用和电荷转移.当表面存在O缺陷时,As₂O₃的吸附能得到提高.Mo、Ti、Mg倾向于掺杂在Fe_oct位,增强了对As₂O₃的吸附能力,并且增大Mo的掺杂量可以强化As₂O₃的吸附.As₂O₃倾向于与活性较强的Mo、Ti、Mg发生反应,从而保护活性Fe位不受砷中毒,Ti和Mg的掺杂还抑制了相邻Fe位对As₂O₃的吸附.Mo、Ti、Mg的掺杂还促进了催化剂表面对NH₃的吸附,增强了表面酸性强度,有利于SCR反应.Mo、Ti、Mg原子的掺杂有利于提高γ-Fe₂O₃催化剂的抗砷中毒性能.     

α-Fe2O3催化臭氧氧化处理苯酚废水的效果及机理

催化臭氧氧化工艺是处理难降解废水的有效手段,但仍存在臭氧利用率较差、催化效率低、催化剂活性组分流失等问题. 本文以α-Fe₂O₃作为臭氧催化剂,通过SEM、N₂吸附/脱附等方法表征了α-Fe₂O₃的结构,构建了α-Fe₂O₃催化臭氧氧化处理苯酚废水体系,优化催化条件,提高处理效率,并对催化机理和催化剂稳定性进行了深入讨论. 结果表明:①α-Fe₂O₃表现为团聚的不规则球状,且比表面积较大,达83.38 m2/g,具有良好的臭氧催化潜力. ②臭氧投加量和pH对催化体系的影响明显,但α-Fe₂O₃投加量的变化对降解效果的控制并不显著,在优化的条件下反应30 min时COD的去除率可达97.67%,较单独臭氧提高了41.33%. ③在催化臭氧氧化中投加TBA和Na₃PO₄分别屏蔽·OH和路易斯酸性位点后,COD的去除率分别降低了17.01%和20.92%,这表明在α-Fe₂O₃表面的路易斯酸性位点产生的·OH是COD去除率高的主要原因. ④α-Fe₂O₃在重复试验中保持了较高的催化活性和稳定性,6次重复后对COD的去除率仍可达到93.07%,流失率为1.05%. 研究显示,α-Fe₂O₃表现了优异的臭氧分解协同作用,具有良好的苯酚持续去除能力和结构稳定性,可为高效去除含酚废水或难降解废水提供技术参考.      

UV/O3-Na2S2O8处理活性炭再生冷凝废水效能及机理

过热蒸汽法再生活性炭的过程中会产生大量含难降解有机物的冷凝废水,为去除冷凝废水中难降解COD,提高可生化性,采用紫外/臭氧活化过硫酸盐（UV/O₃-Na₂S₂O₈）氧化体系对活性炭再生冷凝废水进行处理,考察了O₃投加量、初始pH和Na₂S₂O₈投加量等因素对有机物处理效能的影响,并采用红外光谱、紫外-可见光谱和三维荧光等表征手段探究了冷凝废水处理过程中的变化机理。结果表明:当O₃投加量为30 mg/L,pH值为9.0,Na₂S₂O₈投加量为0.4 g/L时,在120 min内对冷凝废水的COD去除率达到82.1%,色度（CN）去除率达到86.3%。冷凝废水可生化性得到提高,BOD₅/COD值由0.17提升至0.46。由冷凝废水溶解性有机物（DOM）的表征可知,DOM中的腐殖质和发色基团被持续氧化,芳构化程度降低,色氨酸类有机物得到有效去除。结论表明,UV/O₃-Na₂S₂O₈氧化体系可有效去除冷凝废水中的难降解有机物。     

过渡金属负载γ-Al2O3对HCN催化水解性能的影响

为高效催化水解净化废气中的HCN,采用等体积浸渍法改性γ-Al₂O₃制备HCN水解催化剂,考察不同金属组分及其负载量对HCN催化水解效率的影响. 结果表明:不同金属对HCN的催化水解活性依次为Cu>Cr>Fe>Zn>Ni>Co,Cu/γ-Al₂O₃系催化剂中Cu的最佳负载量为15.0%,添加1.0%的Ni有助于增加该催化剂对HCN的催化水解性能. 空速为18 000 h-1时,Cu/Ni/γ-Al₂O₃型催化剂在6 h内净化效率均能保持在91%以上,尾气中ρ(NH₃)为16.6 mg/m3. 采用X线衍射(XRD)、扫描电镜与能量色谱(SEM/EDS)、N₂物理吸附(N₂-BET)对Cu/Ni/γ-Al₂O₃系催化剂表征可知,CuO是Cu/Ni/γ-Al₂O₃系催化剂的主要活性成分,与未改性γ-Al₂O₃相比,Cu、Ni改性后催化剂微孔和中孔(孔宽为1.7~15.0 nm)的孔体积有所降低,其中直径较小的中孔对HCN的催化水解起主导作用.