共查询到19条相似文献,搜索用时 125 毫秒
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钴—钼废催化剂钼回收新工艺 总被引:2,自引:0,他引:2
分析了现有钴-钼废催化剂中钼回收工艺存在的问题,确定了一条较为合理的工艺流程,解决了现有回收工艺存在的问题,降低了能耗,硫酸根含量达到制造催化剂对钼酸的质量要求。 相似文献
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分光光度法测定钴—钼废催化剂中钼的研究 总被引:7,自引:0,他引:7
研究了在还原剂存在下硫氰酸钾与钼的显色反应。发现硫脲存在下,钼与硫氰酸钾在1.5-2mol硫酸溶液中中形成橙红色络合物,其最大吸收峰位于460nm处,表观摩尔吸收系数18.5×10^3L.mol^-1,cm^-1。钼浓度与钼络俣物的吸光度在0-20mg/ml范围内有良好的线性关系。 相似文献
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0前言
钼是一种难熔稀有金属,蕴藏量较少。近年来,随着科技的进步,科研成果的不断涌现,钼的应用领域将不断得到拓宽和延伸,在国民经济中的地位越来越突出。然而工业废催化剂常作为废料被抛弃,但其中含有许多有价金属。对钼而言,每年有大约几千吨废催化剂从装置上卸下来,废铁钼催化剂中主要成分为Fe2O33和MoO3,Mo含量达30%~50%左右。所以回收其中的钼,既是对宝贵资源的充分利用,又能创造出可观的经济效益。 相似文献
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The activity of various molybdenum oxides supported on a molybdenum foil substrate for the catalysis of propylene metathesis is measured using an isolatable, high-pressure reactor incorporated in an ultra-high vacuum (UHV) chamber which allows samples to be transferred directly from vacuum into the catalytic test chamber. MoO
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samples are prepared both by oxidation of metallic molybdenum and reduction of molybdenum trioxide. The results suggest that the presence of an oxygen overlayer on the catalyst inhibits reaction and that the ranking of activity for metathesis at 870 K using 450 Torr of propylene for oxide samples is MoO2>MoO3>Mo where MoO2 is 30 times more active than molybdenum metal under these conditions. 相似文献
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催化裂化废催化剂低碳循环处理和资源化利用已成为目前环境学科的难点问题。本文对催化裂化废催化剂在减量化、无害化和资源化处理方面的技术、研究成果进行了归纳和总结,阐述了各种技术的优缺点、相互关联性和适用性。对催化裂化废催化剂的应用前景及未来工作进行了评述和展望,指出研发新型催化裂化废催化剂处理技术应着重考虑环境和健康的处理技术,低碳与资源化、循环利用、清洁高效应是今后研究工作努力的方向。 相似文献
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全世界化工行业每年会置换出大量的废催化剂,如处置不当,不仅污染环境,而且浪费了资源。本文对化工行业废催化剂的现状进行了初步调查分析,综述了其来源、类别及特点。基于废催化剂中有价金属的含量远远高于矿藏中所含有的相应组分的特点,建议将其作为二次资源进行利用;分析了化工废催化剂潜在的环境风险并提出了开展环境风险评价的流程,建议建立废催化剂环境风险信息数据库;概括论述了废催化剂减量化、资源化、无害化等的控制手段及存在的问题。文中提出:对于化工废催化剂的处理处置应从清洁生产的角度考虑,不局限于单纯的末端污染控制;建议开展废催化剂减量化、资源化及无害化处理的绿色新技术,达到减少污染、资源综合回收利用的目的。 相似文献
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绿色低能耗的炼油废催化剂生物淋滤技术已受到广泛关注。本文从炼油废催化剂金属含量及赋存特征、生物淋滤微生物种类、金属浸取效率、生物淋滤过程影响因素和淋滤动力学等角度综述了相关研究成果,并对研究现状和发展前景进行了简要分析。硫酸杆菌、黑曲霉菌、简青霉菌是最常见的废催化剂生物淋滤菌种;生物淋滤作用下加氢废催化剂金属浸取效率较高,流化催化裂化(FCC)废催化剂的金属较难浸取;温度、固液比、废催化剂粒径是影响炼油废催化剂生物淋滤过程的主要因素;化学反应动力学和膜扩散动力学是研究中广泛应用的动力学模型。目前关于生物淋滤处理炼油废催化剂金属的研究仍处于实验室研究阶段,尚未开展小试、中试或工业化应用的相关研究。 相似文献
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In this study, two spent catalysts from the 3rd and 4th fixed beds of the atmospheric residue desulfurization (ARDS) process and one spent catalyst from the H-Oil process employing the expanded bed were used as the starting material for preparation of hydroprocessing catalysts. The spent catalysts were used either in a coked or decoked form. The procedures involved pulverizing the spent catalysts before mixing, kneading and extruding with boehmite in the presence of peptizing agent such as HNO3. The hydrodesufurization (HDS) and hydrodemetallization (HDM) activities of the new catalysts were evaluated in the microreactor using the atmospheric residue derived from Kuwait crude. The new catalysts prepared from the spent catalysts used in the fixed bed reactors exhibited higher activity than that of commercial catalysts. The HDS activity of the new catalysts prepared from spent catalysts used in the ebullated bed reactor was much lower than that of the other catalysts. This was attributed to a high content of vanadium in the former spent catalyst. At the same time, the adverse effect of vanadium on HDM was much less evident. 相似文献
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The effect of the presence of some molybdenum catalysts on the amount of extractives in cedar wood has been studied. Autoclave treatment of cedar wood in the presence of some molybdenum catalysts can increase the amount of extracts. While autoclave treatment of cedar wood in water gave 2.85% extractives, the same treatment in the presence of H3PMo12O40 gave 7.51% extractives. In the presence of silica-supported MoO3, the amount of extractives was 5.50%. The extractives obtained using water were partially soluble in chloroform (40.7%). Only 27.6% of the extractives obtained using H3PMo12O40 was soluble in the same organic solvent. When cedar was treated with silica-supported MoO3, 56.4% of the extractives was soluble in chloroform. The extracts can be a source of fatty acids for biodiesel production and simple carbohydrates. The analysis of the chloroform-soluble fraction showed that the autoclave treatment of cedar wood gave 49.7% of a mixture of 2-hydroxy-1-(hydroxymethyl)ethyl hexadecanoate, 2-hydroxy-1-(hydroxymethyl)ethyl octadecanoate, and 2,3-dihydroxypropyl octadecanoate. The extractives obtained in the presence of the polyoxometalate molybdenum derivative gave 95% of the same esters of fatty acids, while those obtained in the presence of silica supported MoO3 showed the presence of 93% of the same esters. Gas chromatography–mass spectrometry (GC-MS) of water-soluble fraction showed the presence of some simple carbohydrates, mainly ribose, xylose, and arabinose. 相似文献
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选用具有高比表面积的介孔分子筛SBA-15作为载体,采用等体积浸渍法制备Mo/SBA-15和KMo/SBA-15催化剂并用于一步法合成甲硫醇,并采用氮气吸脱附(BET)、X射线衍射分析(XRD)、拉曼光谱(Raman)、X射线光电子能谱分析(XPS)等进行表征,研究钾离子的添加对催化合成甲硫醇的影响。结果表明,K的添加大幅提升了Mo/SBA-15的甲硫醇选择性和CO的转化率;在高浓度H2S环境下,KMo/SBA-15催化剂上甲硫醇选择性达到了62%,高于目前文献报道的催化剂。Raman、XPS表征结果表明,添加K的催化剂上硫化后加氢脱硫活性相MoS2含量增多。 相似文献