摘要
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.
In order to efficiently purify HCN in waste gases by catalytic hydrolysis, Equivalent-Volumetric Impregnation method was employed to modify γ-Al2O3 for hydrolytic decomposition of HCN. The effects of various selected metallic ingredients and their loading capacities on the efficiency of hydrolytic decomposition of HCN were investigated. The results indicated that the catalytic activities of active ingredients followed the order： Cu 〉 Cr 〉 Fe 〉 Zn 〉 Ni 〉 Co. For the best catalyst, Cu/T-Al2O3 , optimum loading capacity of Cu was determined to be 15.0%. In addition, the catalysis activity of Cu/y-Al2O3 was found to be improved by loading 1.0% of Ni. The purification efficiencies of the Cu/Ni/y-Al2 O3 catalyst were above 91% within 6 hours under the condition of airspeed at 18,000 h-~, and 16. 6 mg/m^3 of NH3 in the tail gas could be detected. The results of characterization using X-ray Diffraction （XRD） , Scanning Electron Microscope/Energy Dispersive Spectrometer （SEM/EDS） and N2 Adsorption-Desorption isotherm （N2-BET） indicated that CuO is the main active ingredient in the Cu/Ni/y-Al2O3 catalyst. The pore volume of the catalyst modified with Cu and Ni decreased for blocking micropores and mesopores with diameters of 1.7-15.0 nm, leading to the decrease of the efficiency of catalytic hydrolysis. Mesopores with small diameters played a main role in the hydrolytic decomposition of HCN.
出处
《环境科学研究》
EI
CAS
CSSCI
CSCD
北大核心
2014年第12期1465-1471,共7页
Research of Environmental Sciences
基金
国家高技术研究发展计划(863)重点项目(2012AA062504)
国家自然科学基金项目(21277064
21077048)
教育部科学技术研究重点项目(210202)
关键词
HCN
催化水解
活性氧化铝
过渡金属
hydrogen cyanide
catalytic hydrolysis
activated alumina
transition metals
